1
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Zhang Z, Chen S, Zhu J, Ye C, Mao Y, Wang B, Zhou G, Mai L, Wang Z, Liu X, Wang D. Charge-Separated Pd δ--Cu δ+ Atom Pairs Promote CO 2 Reduction to C 2. NANO LETTERS 2023; 23:2312-2320. [PMID: 36861218 DOI: 10.1021/acs.nanolett.2c05112] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Positively charged Cu sites have been confirmed to significantly promote the production of multicarbon (C2) products from an electrochemical CO2 reduction reaction (CO2RR). However, the positively charged Cu has difficulty in existing under a strong negative bias. In this work, we design a Pdδ--Cu3N catalyst containing charge-separated Pdδ--Cuδ+ atom pair that can stabilize the Cuδ+ sites. In situ characterizations and density functional theory reveal that the first reported negatively charged Pdδ- sites exhibited a superior CO binding capacity together with the adjacent Cuδ+ sites, synergistically promoting the CO dimerization process to produce C2 products. As a result, we achieve a 14-fold increase in the C2 product Faradaic efficiency (FE) on Pdδ--Cu3N, from 5.6% to 78.2%. This work provides a new strategy for synthesizing negative valence atom-pair catalysts and an atomic-level modulation approach of unstable Cuδ+ sites in the CO2RR.
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Affiliation(s)
- Zedong Zhang
- Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Shenghua Chen
- Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Jiexin Zhu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, People's Republic of China
| | - Chenliang Ye
- Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Yu Mao
- School of Chemical Sciences, The University of Auckland, Auckland 1010, New Zealand
| | - Bingqing Wang
- Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Gang Zhou
- School of Science, Hubei University of Technology, Wuhan 430068, People's Republic of China
| | - Liqiang Mai
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, People's Republic of China
| | - Ziyun Wang
- School of Chemical Sciences, The University of Auckland, Auckland 1010, New Zealand
| | - Xiangwen Liu
- Institute of Analysis and Testing, Beijing Academy of Science and Technology (Beijing Center for Physical and Chemical Analysis), Beijing 100094, People's Republic of China
| | - Dingsheng Wang
- Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
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2
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Ichihara F, Miyoshi S, Masuda T. Co-sintering process of LiCoO 2 cathodes and NASICON-type LATP solid electrolytes studied by X-ray diffraction and X-ray absorption near edge structure. Phys Chem Chem Phys 2022; 24:25878-25884. [PMID: 36168846 DOI: 10.1039/d2cp01020h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The composites of a high-capacity cathode material in lithium-ion batteries, LiCoO2 (LCO) and an oxide-based solid electrolyte, Li1.3Al0.3Ti1.7(PO4)3 (LATP), were sintered at various temperatures and their reaction products were subsequently identified by X-ray diffraction (XRD) and X-ray absorption near edge structure (XANES). Rietveld analysis of XRD and the linear combination fitting of XANES showed that the reaction of LCO and LATP proceeds via three major steps; from 300 °C to 500 °C, LCO and LATP react with each other to form Co3O4, amorphous TiO2 and Li3PO4; from 500 °C at which crystalline LCO is completely decomposed, LATP reacts not only with remaining amorphous/low crystalline LCO but also with Co3O4 to form LiCoPO4 and TiO2; from 700 °C to 750 °C, Co3O4 and TiO2 react with each other to form CoTiO3. The final products at 900 °C are LiCoPO4, CoTiO3, TiO2, and Li3PO4.
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Affiliation(s)
- Fumihiko Ichihara
- Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan.
| | - Shogo Miyoshi
- Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan.
| | - Takuya Masuda
- Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan. .,Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan
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3
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Deplano G, Martini A, Signorile M, Borfecchia E, Crocellà V, Svelle S, Bordiga S. Copper Pairing in the Mordenite Framework as a Function of the Cu
I
/Cu
II
Speciation. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Gabriele Deplano
- Department of Chemistry NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15 I-10135 and Via P. Giuria 7, I-10125 Torino Italy
| | - Andrea Martini
- Department of Chemistry NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15 I-10135 and Via P. Giuria 7, I-10125 Torino Italy
- Smart Materials Research Institute Southern Federal University Sladkova Street 174/28 344090 Rostov-on-Don Russia
| | - Matteo Signorile
- Department of Chemistry NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15 I-10135 and Via P. Giuria 7, I-10125 Torino Italy
| | - Elisa Borfecchia
- Department of Chemistry NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15 I-10135 and Via P. Giuria 7, I-10125 Torino Italy
| | - Valentina Crocellà
- Department of Chemistry NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15 I-10135 and Via P. Giuria 7, I-10125 Torino Italy
| | - Stian Svelle
- Department of Chemistry SMN Centre for Materials Science and Nanotechnology University of Oslo N-0315 Oslo Norway
| | - Silvia Bordiga
- Department of Chemistry NIS and INSTM Reference Centre Università di Torino Via G. Quarello 15 I-10135 and Via P. Giuria 7, I-10125 Torino Italy
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4
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Deplano G, Martini A, Signorile M, Borfecchia E, Crocellà V, Svelle S, Bordiga S. Copper Pairing in the Mordenite Framework as a Function of the Cu I /Cu II Speciation. Angew Chem Int Ed Engl 2021; 60:25891-25896. [PMID: 34582094 PMCID: PMC9298398 DOI: 10.1002/anie.202109705] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Indexed: 11/16/2022]
Abstract
A series of gas‐phase reactants is used to treat a Cu‐exchanged mordenite zeolite with the aim of studying the influence of the reaction environment on the formation of Cu pairs. The rearrangement of Cu ions to form multimeric sites as a function of their oxidation state was probed by X‐ray absorption spectroscopy (XAS) and also by applying advanced analysis through wavelet transform, a method able to specifically locate Cu–Cu interactions also in the presence of overlapping contributions from other scattering paths. The nature of the Cu‐oxo species formed upon oxidation was further crosschecked by DFT‐assisted fitting of the EXAFS data and by resonant Raman spectroscopy. Altogether, the CuI/CuII speciation clearly correlates with Cu proximity, with metal ion pairs quantitatively forming under an oxidative environment.
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Affiliation(s)
- Gabriele Deplano
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, I-10125, Torino, Italy
| | - Andrea Martini
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, I-10125, Torino, Italy.,Smart Materials, Research Institute, Southern Federal University, Sladkova Street 174/28, 344090, Rostov-on-Don, Russia
| | - Matteo Signorile
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, I-10125, Torino, Italy
| | - Elisa Borfecchia
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, I-10125, Torino, Italy
| | - Valentina Crocellà
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, I-10125, Torino, Italy
| | - Stian Svelle
- Department of Chemistry, SMN Centre for Materials Science and Nanotechnology, University of Oslo, N-0315, Oslo, Norway
| | - Silvia Bordiga
- Department of Chemistry, NIS and INSTM Reference Centre, Università di Torino, Via G. Quarello 15, I-10135 and Via P. Giuria 7, I-10125, Torino, Italy
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5
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Martini A, Guda AA, Guda SA, Bugaev AL, Safonova OV, Soldatov AV. Machine learning powered by principal component descriptors as the key for sorted structural fit of XANES. Phys Chem Chem Phys 2021; 23:17873-17887. [PMID: 34378592 DOI: 10.1039/d1cp01794b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Modern synchrotron radiation sources and free electron laser made X-ray absorption spectroscopy (XAS) an analytical tool for the structural analysis of materials under in situ or operando conditions. Fourier approach applied to the extended region of the XAS spectrum (EXAFS) allows the estimation of the number of structural and non-structural parameters which can be refined through a fitting procedure. The near edge region of the XAS spectrum (XANES) is also sensitive to the coordinates of all the atoms in the local cluster around the absorbing atom. However, in contrast to EXAFS, the existing approaches of quantitative analysis provide no estimation for the number of structural parameters that can be evaluated for a given XANES spectrum. This problem exists both for the classical gradient descent approaches and for modern machine learning methods based on neural networks. We developed a new approach for rational fit based on principal component descriptors of the spectrum. In this work the principal component analysis (PCA) is applied to a dataset of theoretical spectra calculated a priori on a grid of variable structural parameters of a molecule or cluster. Each principal component of the dataset is related then to a combined variation of several structural parameters, similar to the vibrational normal mode. Orthogonal principal components determine orthogonal deformations that can be extracted independently upon the analysis of the XANES spectrum. Applying statistical criteria, the PCA-based fit of the XANES determines the accessible structural information in the spectrum for a given system.
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Affiliation(s)
- A Martini
- The Smart Materials Research Institute, Southern Federal University, 344090 Sladkova 178/24, Rostov-on-Don, Russia.
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6
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Lais T, Lukashuk L, van de Water L, Hyde TI, Aramini M, Sankar G. Elucidation of copper environment in a Cu-Cr-Fe oxide catalyst through in situ high-resolution XANES investigation. Phys Chem Chem Phys 2021; 23:5888-5896. [PMID: 33660717 DOI: 10.1039/d0cp06468h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copper containing materials are widely used in a range of catalytic applications. Here, we report the use of Cu K-edge high resolution XANES to determine the local site symmetry of copper ions during the thermal treatment of a Cu-Cr-Fe oxide catalyst. We exploited the Cu K-edge XANES spectral features, in particular the correlation between area under the pre-edge peak and its position to determine the local environment of Cu2+ ions. The information gained from this investigation rules out the presence of Cu2+ ions in a tetrahedral or square planar geometry, a mixture of these sites, or in a reduced oxidation state. Evidence is presented that the Cu2+ ions in the Cu-Cr-Fe oxide system are present in a distorted octahedral environment.
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Affiliation(s)
- Tahmin Lais
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
| | - Liliana Lukashuk
- Johnson Matthey, PO Box 1, Belasis Avenue, Billingham, Cleveland TS23 1LB, UK
| | - Leon van de Water
- Johnson Matthey, PO Box 1, Belasis Avenue, Billingham, Cleveland TS23 1LB, UK
| | - Timothy I Hyde
- Johnson Matthey, Blounts Court, Sonning Common, Reading, RG4 9NH, UK
| | - Matteo Aramini
- Diamond Light Source, Harwell Science & Innovation Campus, Oxfordshire OX11 0DE, UK
| | - Gopinathan Sankar
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
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7
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Tavani F, Capocasa G, Martini A, Sessa F, Di Stefano S, Lanzalunga O, D'Angelo P. Activation of C-H bonds by a nonheme iron(IV)-oxo complex: mechanistic evidence through a coupled EDXAS/UV-Vis multivariate analysis. Phys Chem Chem Phys 2021; 23:1188-1196. [PMID: 33355324 DOI: 10.1039/d0cp04304d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The understanding of reactive processes involving organic substrates is crucial to chemical knowledge and requires multidisciplinary efforts for its advancement. Herein, we apply a combined multivariate, statistical and theoretical analysis of coupled time-resolved X-ray absorption (XAS)/UV-Vis data to obtain detailed mechanistic information for on the C-H bond activation of 9,10-dihydroanthracene (DHA) and diphenylmethane (Ph2CH2) by the nonheme FeIV-oxo complex [N4Py·FeIV(O)]2+ (N4Py = N,N-bis(2-pyridylmethyl)-N-bis(2-pyridyl)methylamine) in CH3CN at room temperature. Within this approach, we determine the number of key chemical species present in the reaction mixtures and derive spectral and concentration profiles for the reaction intermediates. From the quantitative analysis of the XAS spectra the transient intermediate species are structurally determined. As a result, it is suggested that, while DHA is oxidized by [N4Py·FeIV(O)]2+ with a hydrogen atom transfer-electron transfer (HAT-ET) mechanism, Ph2CH2 is oxidized by the nonheme iron-oxo complex through a HAT-radical dissociation pathway. In the latter process, we prove that the intermediate FeIII complex [N4Py·FeIII(OH)]2+ is not able to oxidize the diphenylmethyl radical and we provide its structural characterization in solution. The employed combined experimental and theoretical strategy is promising for the spectroscopic characterization of transient intermediates as well as for the mechanistic investigation of redox chemical transformations on the second to millisecond time scales.
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Affiliation(s)
- Francesco Tavani
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
| | - Giorgio Capocasa
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
| | - Andrea Martini
- Dipartimento di Chimica, Università degli Studi di Torino, Via P. Giuria 7, 10125 Torino, Italy and The Smart Materials Research Institute, Southern Federal University, 344090 Sladkova 178/24 Rostov-on-Don, Russia
| | - Francesco Sessa
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
| | - Stefano Di Stefano
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
| | - Osvaldo Lanzalunga
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
| | - Paola D'Angelo
- Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro 5, 00185 Roma, Italy.
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8
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Tavani F, Capocasa G, Martini A, Sessa F, Di Stefano S, Lanzalunga O, D'Angelo P. Direct structural and mechanistic insights into fast bimolecular chemical reactions in solution through a coupled XAS/UV–Vis multivariate statistical analysis. Dalton Trans 2021; 50:131-142. [DOI: 10.1039/d0dt03083j] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combined multivariate and theoretical analysis of coupled XAS/UV–Vis data was proven to be an innovative method to obtain direct structural and mechanistic evidence for bimolecular reactions in solution involving organic substrates.
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Affiliation(s)
- Francesco Tavani
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | - Giorgio Capocasa
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | - Andrea Martini
- Dipartimento di Chimica
- Università degli Studi di Torino
- 10125 Torino
- Italy
- The Smart Materials Research Institute
| | - Francesco Sessa
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | | | | | - Paola D'Angelo
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
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9
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Tavani F, Fracchia M, Pianta N, Ghigna P, Quartarone E, D’Angelo P. Multivariate curve resolution analysis of operando XAS data for the investigation of the lithiation mechanisms in high entropy oxides. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137968] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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10
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Spectral Decomposition of X-ray Absorption Spectroscopy Datasets: Methods and Applications. CRYSTALS 2020. [DOI: 10.3390/cryst10080664] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
X-ray absorption spectroscopy (XAS) today represents a widespread and powerful technique, able to monitor complex systems under in situ and operando conditions, while external variables, such us sampling time, sample temperature or even beam position over the analysed sample, are varied. X-ray absorption spectroscopy is an element-selective but bulk-averaging technique. Each measured XAS spectrum can be seen as an average signal arising from all the absorber-containing species/configurations present in the sample under study. The acquired XAS data are thus represented by a spectroscopic mixture composed of superimposed spectral profiles associated to well-defined components, characterised by concentration values evolving in the course of the experiment. The decomposition of an experimental XAS dataset in a set of pure spectral and concentration values is a typical example of an inverse problem and it goes, usually, under the name of multivariate curve resolution (MCR). In the present work, we present an overview on the major techniques developed to realize the MCR decomposition together with a selection of related results, with an emphasis on applications in catalysis. Therein, we will highlight the great potential of these methods which are imposing as an essential tool for quantitative analysis of large XAS datasets as well as the directions for further development in synergy with the continuous instrumental progresses at synchrotron sources.
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11
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Guda AA, Guda SA, Lomachenko KA, Soldatov MA, Pankin IA, Soldatov AV, Braglia L, Bugaev AL, Martini A, Signorile M, Groppo E, Piovano A, Borfecchia E, Lamberti C. Quantitative structural determination of active sites from in situ and operando XANES spectra: From standard ab initio simulations to chemometric and machine learning approaches. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.10.071] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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12
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Timoshenko J, Frenkel AI. “Inverting” X-ray Absorption Spectra of Catalysts by Machine Learning in Search for Activity Descriptors. ACS Catal 2019. [DOI: 10.1021/acscatal.9b03599] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Janis Timoshenko
- Department of Interface Science, Fritz-Haber-Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Anatoly I. Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
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13
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Guo X, Situm A, Barlow BC, Guo B, Burgess IJ, Grosvenor AP. Soft X‐ray spectromicroscopy studies of pitting corrosion of reinforcing steel bar. SURF INTERFACE ANAL 2019. [DOI: 10.1002/sia.6640] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xiaoxuan Guo
- Department of ChemistryUniversity of Saskatchewan Saskatoon SK Canada S7N 5C9
| | - Arthur Situm
- Department of ChemistryUniversity of Saskatchewan Saskatoon SK Canada S7N 5C9
| | - Burke C. Barlow
- Department of ChemistryUniversity of Saskatchewan Saskatoon SK Canada S7N 5C9
| | - Bao Guo
- Department of ChemistryUniversity of Saskatchewan Saskatoon SK Canada S7N 5C9
| | - Ian J. Burgess
- Department of ChemistryUniversity of Saskatchewan Saskatoon SK Canada S7N 5C9
| | - Andrew P. Grosvenor
- Department of ChemistryUniversity of Saskatchewan Saskatoon SK Canada S7N 5C9
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14
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Sharma M, Das B, Sharma M, Deka BK, Park YB, Bhargava SK, Bania KK. Pd/Cu-Oxide Nanoconjugate at Zeolite-Y Crystallite Crafting the Mesoporous Channels for Selective Oxidation of Benzyl-Alcohols. ACS APPLIED MATERIALS & INTERFACES 2017; 9:35453-35462. [PMID: 28933824 DOI: 10.1021/acsami.7b11086] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Solid-state grinding of palladium and copper salts allowed the growth of palladium/copper oxide interface at the zeolite-Y surface. The hybrid nanostructured material was used as reusable heterogeneous catalyst for selective oxidation of various benzyl alcohols. The large surface area provided by the zeolite-Y matrix highly influenced the catalytic activity, as well as the recyclability of the synthesized catalyst. Impregnation of PdO-CuO nanoparticles on zeolite crystallite leads to the generation of mesoporous channel that probably prevented the leaching of the metal-oxide nanoparticles and endorsed high mass transfer. Formation of mesoporous channel at the external surface of zeolite-Y was evident from transmission electron microscopy and surface area analysis. PdO-CuO nanoparticles were found to be within the range of 2-5 nm. The surface area of PdO-CuO-Y catalyst was found to be much lower than parent zeolite-Y. The decrease in surface area as well as the presence of hysteresis loop in the N2-adsoprtion isotherm further suggested successful encapsulation of PdO-CuO nanoparticles via the mesoporous channel formation. The high positive shifting in binding energy in both Pd and Cu was attributed to the influence of zeolite-Y framework on lattice contraction of metal oxides via confinement effect. PdO-CuO-Y catalyst was found to oxidize benzyl alcohol with 99% selectivity. On subjecting to microwave irradiation the same oxidation reaction was found to occur at ambient condition giving same conversion and selectivity.
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Affiliation(s)
- Mukesh Sharma
- Department of Chemical Sciences, Tezpur University , Tezpur, Assam, India , 784028
| | - Biraj Das
- Department of Chemical Sciences, Tezpur University , Tezpur, Assam, India , 784028
| | - Mitu Sharma
- Department of Chemical Sciences, Tezpur University , Tezpur, Assam, India , 784028
| | - Biplab K Deka
- School of Mechanical, Aerospace and Nuclear Engineering, Ulsan National Institute of Science and Technology , Ulsan, Republic of Korea , 44919
| | - Young-Bin Park
- School of Mechanical, Aerospace and Nuclear Engineering, Ulsan National Institute of Science and Technology , Ulsan, Republic of Korea , 44919
| | - Suresh K Bhargava
- School of Sciences, RMIT University , Melbourne, Victoria 3000, Australia
| | - Kusum K Bania
- Department of Chemical Sciences, Tezpur University , Tezpur, Assam, India , 784028
- School of Sciences, RMIT University , Melbourne, Victoria 3000, Australia
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15
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Cole JM, Cheng X, Payne MC. Modeling Pair Distribution Functions of Rare-Earth Phosphate Glasses Using Principal Component Analysis. Inorg Chem 2016; 55:10870-10880. [PMID: 27753490 DOI: 10.1021/acs.inorgchem.6b00907] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The use of principal component analysis (PCA) to statistically infer features of local structure from experimental pair distribution function (PDF) data is assessed on a case study of rare-earth phosphate glasses (REPGs). Such glasses, codoped with two rare-earth ions (R and R') of different sizes and optical properties, are of interest to the laser industry. The determination of structure-property relationships in these materials is an important aspect of their technological development. Yet, realizing the local structure of codoped REPGs presents significant challenges relative to their singly doped counterparts; specifically, R and R' are difficult to distinguish in terms of establishing relative material compositions, identifying atomic pairwise correlation profiles in a PDF that are associated with each ion, and resolving peak overlap of such profiles in PDFs. This study demonstrates that PCA can be employed to help overcome these structural complications, by statistically inferring trends in PDFs that exist for a restricted set of experimental data on REPGs, and using these as training data to predict material compositions and PDF profiles in unknown codoped REPGs. The application of these PCA methods to resolve individual atomic pairwise correlations in t(r) signatures is also presented. The training methods developed for these structural predictions are prevalidated by testing their ability to reproduce known physical phenomena, such as the lanthanide contraction, on PDF signatures of the structurally simpler singly doped REPGs. The intrinsic limitations of applying PCA to analyze PDFs relative to the quality control of source data, data processing, and sample definition, are also considered. While this case study is limited to lanthanide-doped REPGs, this type of statistical inference may easily be extended to other inorganic solid-state materials and be exploited in large-scale data-mining efforts that probe many t(r) functions.
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Affiliation(s)
- Jacqueline M Cole
- Cavendish Laboratory, University of Cambridge , J. J. Thomson Avenue, Cambridge CB3 0HE, U.K.,Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.,ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus , Didcot, Oxfordshire OX11 0QX, U.K.,Department of Chemical Engineering and Biotechnology, University of Cambridge , West Cambridge Site, Philippa Fawcett Drive, Cambridge CB3 0FS, U.K
| | - Xie Cheng
- Cavendish Laboratory, University of Cambridge , J. J. Thomson Avenue, Cambridge CB3 0HE, U.K
| | - Michael C Payne
- Cavendish Laboratory, University of Cambridge , J. J. Thomson Avenue, Cambridge CB3 0HE, U.K
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16
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17
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Eslava JL, Iglesias-Juez A, Agostini G, Fernández-Garcı́a M, Guerrero-Ruiz A, Rodrı́guez-Ramos I. Time-Resolved XAS Investigation of the Local Environment and Evolution of Oxidation States of a Fischer–Tropsch Ru–Cs/C Catalyst. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02489] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- José L. Eslava
- Instituto
de Catálisis y Petroleoquı́mica, CSIC, C/Marie Curie
2, 28049 Madrid, Spain
| | - Ana Iglesias-Juez
- Instituto
de Catálisis y Petroleoquı́mica, CSIC, C/Marie Curie
2, 28049 Madrid, Spain
| | - Giovanni Agostini
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Marcos Fernández-Garcı́a
- Instituto
de Catálisis y Petroleoquı́mica, CSIC, C/Marie Curie
2, 28049 Madrid, Spain
- Grupo
de Diseño y Aplicación de Catalizadores Heterogéneos, Unidad Asociada UNED-CSIC (ICP), 28040 Madrid, Spain
| | - Antonio Guerrero-Ruiz
- Grupo
de Diseño y Aplicación de Catalizadores Heterogéneos, Unidad Asociada UNED-CSIC (ICP), 28040 Madrid, Spain
- Departamento
de Quı́mica Inorgánica y Quı́mica Técnica, UNED, C/Senda del Rey 9, 28040 Madrid, Spain
| | - Inmaculada Rodrı́guez-Ramos
- Instituto
de Catálisis y Petroleoquı́mica, CSIC, C/Marie Curie
2, 28049 Madrid, Spain
- Grupo
de Diseño y Aplicación de Catalizadores Heterogéneos, Unidad Asociada UNED-CSIC (ICP), 28040 Madrid, Spain
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19
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Kelly SD, Hesterberg D, Ravel B. Analysis of Soils and Minerals Using X-ray Absorption Spectroscopy. METHODS OF SOIL ANALYSIS PART 5-MINERALOGICAL METHODS 2015. [DOI: 10.2136/sssabookser5.5.c14] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Affiliation(s)
- S. D. Kelly
- Argonne National Laboratory; Argonne Illinois
| | - D. Hesterberg
- North Carolina State University; Raleigh North Carolina
| | - B. Ravel
- Argonne National Laboratory; Argonne Illinois
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20
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Blanchard PER, Hayes JR, Grosvenor AP, Rowson J, Hughes K, Brown C. Investigating the Geochemical Model for Molybdenum Mineralization in the JEB Tailings Management Facility at McClean Lake, Saskatchewan: An X-ray Absorption Spectroscopy Study. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:6504-6509. [PMID: 25919895 DOI: 10.1021/acs.est.5b00528] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The geochemical model for Mo mineralization in the JEB Tailings Management Facility (JEB TMF), operated by AREVA Resources Canada at McClean Lake, Saskatchewan, was investigated using X-ray Absorption Near-Edge Spectroscopy (XANES), an elemental-specific technique that is sensitive to low elemental concentrations. Twenty five samples collected during the 2013 sampling campaign from various locations and depths in the TMF were analyzed by XANES. Mo K-edge XANES analysis indicated that the tailings consisted primarily of Mo(6+) species: powellite (CaMoO4), ferrimolybdite (Fe2(MoO4)3·8H2O), and molybdate adsorbed on ferrihydrite (Fe(OH)3 - MoO4). A minor concentration of a Mo(4+) species in the form of molybdenite (MoS2) was also present. Changes in the Mo mineralization over time were inferred by comparing the relative amounts of the Mo species in the tailings to the independently measured aqueous Mo pore water concentration. It was found that ferrimolybdite and molybdate adsorbed on ferrihydrite initially dissolves in the TMF and precipitates as powellite.
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Affiliation(s)
- Peter E R Blanchard
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C9, Canada
- AREVA Resources Canada, Saskatoon, Saskatchewan S7K 3X5
| | - John R Hayes
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C9, Canada
- AREVA Resources Canada, Saskatoon, Saskatchewan S7K 3X5
| | - Andrew P Grosvenor
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C9, Canada
- AREVA Resources Canada, Saskatoon, Saskatchewan S7K 3X5
| | - John Rowson
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C9, Canada
- AREVA Resources Canada, Saskatoon, Saskatchewan S7K 3X5
| | - Kebbi Hughes
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C9, Canada
- AREVA Resources Canada, Saskatoon, Saskatchewan S7K 3X5
| | - Caitlin Brown
- Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5C9, Canada
- AREVA Resources Canada, Saskatoon, Saskatchewan S7K 3X5
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21
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Manceau A, Marcus M, Lenoir T. Estimating the number of pure chemical components in a mixture by X-ray absorption spectroscopy. JOURNAL OF SYNCHROTRON RADIATION 2014; 21:1140-1147. [PMID: 25178004 DOI: 10.1107/s1600577514013526] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 06/10/2014] [Indexed: 06/03/2023]
Abstract
Principal component analysis (PCA) is a multivariate data analysis approach commonly used in X-ray absorption spectroscopy to estimate the number of pure compounds in multicomponent mixtures. This approach seeks to describe a large number of multicomponent spectra as weighted sums of a smaller number of component spectra. These component spectra are in turn considered to be linear combinations of the spectra from the actual species present in the system from which the experimental spectra were taken. The dimension of the experimental dataset is given by the number of meaningful abstract components, as estimated by the cascade or variance of the eigenvalues (EVs), the factor indicator function (IND), or the F-test on reduced EVs. It is shown on synthetic and real spectral mixtures that the performance of the IND and F-test critically depends on the amount of noise in the data, and may result in considerable underestimation or overestimation of the number of components even for a signal-to-noise (s/n) ratio of the order of 80 (σ = 20) in a XANES dataset. For a given s/n ratio, the accuracy of the component recovery from a random mixture depends on the size of the dataset and number of components, which is not known in advance, and deteriorates for larger datasets because the analysis picks up more noise components. The scree plot of the EVs for the components yields one or two values close to the significant number of components, but the result can be ambiguous and its uncertainty is unknown. A new estimator, NSS-stat, which includes the experimental error to XANES data analysis, is introduced and tested. It is shown that NSS-stat produces superior results compared with the three traditional forms of PCA-based component-number estimation. A graphical user-friendly interface for the calculation of EVs, IND, F-test and NSS-stat from a XANES dataset has been developed under LabVIEW for Windows and is supplied in the supporting information. Its possible application to EXAFS data is discussed, and several XANES and EXAFS datasets are also included for download.
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Affiliation(s)
- Alain Manceau
- ISTerre, Université Grenoble Alpes and CNRS, F-38000 Grenoble, France
| | - Matthew Marcus
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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22
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Cassinelli WH, Martins L, Passos AR, Pulcinelli SH, Santilli CV, Rochet A, Briois V. Multivariate curve resolution analysis applied to time-resolved synchrotron X-ray Absorption Spectroscopy monitoring of the activation of copper alumina catalyst. Catal Today 2014. [DOI: 10.1016/j.cattod.2013.10.077] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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23
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Hayes JR, Grosvenor AP, Rowson J, Hughes K, Frey RA, Reid J. Analysis of the Mo speciation in the JEB tailings management facility at McClean Lake, Saskatchewan. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:4460-4467. [PMID: 24708531 DOI: 10.1021/es404980x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The JEB Tailings Management Facility (TMF) is central to reducing the environmental impact of the uranium ore processing operation located at the McClean Lake facility and operated by AREVA Resources Canada (AREVA). The geochemical controls of this facility are largely designed around the idea that elements of concern, such as Mo, will be controlled in the very long term through equilibrium with supporting minerals. However, these systems are far from equilibrium when the tailings are first placed in the TMF, and it can take years, decades, or centuries to reach equilibrium. Therefore, it is necessary to understand how these reactions evolve toward an equilibrium state to understand the very long-term behavior of the TMF and to ensure that the elements of concern will be adequately contained. To this end, the Mo speciation in a series of samples taken from the JEB TMF during the 2008 sampling campaign has been analyzed. This analysis was performed using powder X-ray diffraction (XRD), X-ray fluorescence mapping (μ-XRF), and X-ray absorption near-edge spectroscopy (XANES). These results show that only XANES was effective in speciating Mo in the tailings samples, because it was both element-specific and sensitive enough to detect the low concentrations of Mo present. These results show that the predominant Mo-bearing phases present in the TMF are powellite, ferrimolybdite, and molybdate adsorbed on ferrihydrite.
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Affiliation(s)
- John R Hayes
- Department of Chemistry, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5C9, Canada
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24
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García-García FR, Fernández-García M, Newton MA, Rodríguez-Ramos I, Guerrero-Ruiz A. Following the Evolution of Ru/Activated Carbon Catalysts during the Decomposition-Reduction of the Ru(NO)(NO3)3Precursor. ChemCatChem 2013. [DOI: 10.1002/cctc.201300065] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Bordiga S, Groppo E, Agostini G, van Bokhoven JA, Lamberti C. Reactivity of Surface Species in Heterogeneous Catalysts Probed by In Situ X-ray Absorption Techniques. Chem Rev 2013; 113:1736-850. [DOI: 10.1021/cr2000898] [Citation(s) in RCA: 488] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Silvia Bordiga
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Elena Groppo
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Giovanni Agostini
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Jeroen A. van Bokhoven
- ETH Zurich, Institute for Chemical and Bioengineering, HCI E127 8093 Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry (LSK) Swiss Light Source, Paul Scherrer Instituteaul Scherrer Institute, Villigen, Switzerland
| | - Carlo Lamberti
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
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26
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Phillips AE, Cole JM, Low KS, Cibin G. L2,3-edge x-ray absorption near-edge spectroscopy analysis of photoisomerism in solid ruthenium-sulfur dioxide complexes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:085505. [PMID: 23360869 DOI: 10.1088/0953-8984/25/8/085505] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Ru L(2,3) edge x-ray absorption near-edge spectroscopy spectra of four compounds [Ru(SO(2))(NH(3))(4)X]Y (X = water, Y = (±)-camphorsulfonate(2); X =water, Y = tosylate(2); X =isonicotinamide, Y = tosylate(2); X =pyridine, Y = triflate(2)) are reported before and after optical excitation, which causes photoinduced linkage isomerism of the SO(2) ligand. Principal component analysis reveals consistent changes in the spectra upon photoisomerization, suggesting a partial oxidation of the Ru ion. These results demonstrate that x-ray absorption near-edge spectroscopy is an effective means of probing photoinduced linkage isomerism.
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Affiliation(s)
- Anthony E Phillips
- Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UK
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27
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Stötzel J, Lützenkirchen-Hecht D, Grunwaldt JD, Frahm R. T-REX: new software for advanced QEXAFS data analysis. JOURNAL OF SYNCHROTRON RADIATION 2012; 19:920-929. [PMID: 23093750 DOI: 10.1107/s0909049512038599] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Accepted: 09/08/2012] [Indexed: 06/01/2023]
Abstract
New approaches to analyze the data generated by modern time-resolved X-ray absorption spectroscopy instrumentation are presented as part of a new analysis software to handle files containing typically a few thousand EXAFS spectra. Various filter techniques to remove high-frequency noise and run-away values are discussed as well as advanced analysis tools like linear combination fitting, EXAFS fitting, principal component analysis and phase-sensitive detection. These techniques were implemented in a user-friendly graphical user interface to analyse huge data files where it is not possible to treat each spectrum separately. New ideas to exploit existent tools more efficiently for time-resolved EXAFS data analysis are discussed theoretically as well as applied to real measurements, especially in situ catalytic experiments and surface-sensitive reflection-mode X-ray absorption studies of thin film growth.
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Affiliation(s)
- Jan Stötzel
- Fachbereich C-Physik, Universität Wuppertal, Wuppertal, Germany.
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28
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Kubacka A, Iglesias-Juez A, Martínez-Arias A, Di Michiel M, Newton MA, Fernández-García M. Surface and Bulk Approach to Time-resolved Characterization of Heterogeneous Catalysts. ChemCatChem 2012. [DOI: 10.1002/cctc.201200131] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Iglesias-Juez A, Kubacka A, Fernández-García M, Di Michiel M, Newton MA. Nanoparticulate Pd supported catalysts: size-dependent formation of Pd(I)/Pd(0) and their role in CO elimination. J Am Chem Soc 2011; 133:4484-9. [PMID: 21370924 DOI: 10.1021/ja110320y] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A combination of time-resolved X-ray absorption spectroscopy (XAS), hard X-ray diffraction (HXRD), diffuse reflectance infrared spectroscopy (DRIFTS), and mass spectrometry (MS) reveals a series of size-dependent phenomena at Pd nanoparticles upon CO/(NO+O(2)) cycling conditions. The multitechnique approach and analysis show that such size-dependent phenomena are critical for understanding Pd CO elimination behavior and, particularly, that different Pd(I) and Pd(0) centers act as active species for a size estimated by XAS to be, respectively, below and above ca. 3 nm. The relative catalytic performance of these two noble metal species indicates the intrinsic higher activity of the Pd(I) species.
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Affiliation(s)
- Ana Iglesias-Juez
- Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie-Curie 2, 28049 Madrid, Spain
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30
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Smolentsev G, Guilera G, Tromp M, Pascarelli S, Soldatov AV. Local structure of reaction intermediates probed by time-resolved x-ray absorption near edge structure spectroscopy. J Chem Phys 2009; 130:174508. [DOI: 10.1063/1.3125940] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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31
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Fierro-Gonzalez JC, Kuba S, Hao Y, Gates BC. Oxide- and Zeolite-Supported Molecular Metal Complexes and Clusters: Physical Characterization and Determination of Structure, Bonding, and Metal Oxidation State. J Phys Chem B 2006; 110:13326-51. [PMID: 16821852 DOI: 10.1021/jp0571123] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This article is a review of the physical characterization of well-defined site-isolated molecular metal complexes and metal clusters supported on metal oxides and zeolites. These surface species are of interest primarily as catalysts; as a consequence of their relatively uniform structures, they can be characterized much more precisely than traditional supported catalysts. The properties discussed in this review include metal nuclearity, oxidation state, and ligand environment, as well as metal-support interactions. These properties are determined by complementary techniques, including transmission electron microscopy; X-ray absorption, infrared, Raman, and NMR spectroscopies; and density functional theory. The strengths and limitations of these techniques are assessed in the context of results characterizing samples that have been investigated thoroughly and with multiple techniques. The depth of understanding of well-defined metal complexes and metal clusters on supports is approaching that attainable for molecular analogues in solution. The results provide a foundation for understanding the more complex materials that are typical of industrial catalysts.
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Affiliation(s)
- Juan C Fierro-Gonzalez
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, USA
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32
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Dathe H, Haider P, Jentys A, Lercher JA. SOx Storage Materials under Lean−Rich Cycling Conditions. Part I: Identification of Transient Species. J Phys Chem B 2006; 110:10729-37. [PMID: 16771320 DOI: 10.1021/jp0611931] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The SO(x) uptake of second generation sulfur trapping materials was studied by in situ IR spectroscopy under lean-rich cycling conditions. The combination of advanced chemometric methods including generalized 2D correlation analysis, 2D sample-sample correlation analysis, and multivariate curve resolution with alternating least squares allowed the detection of the species involved in the storage process. The formation of the bulk sulfate species was always accompanied by the consumption of carbonates. The reduction of a transient surface sulfate species was identified as the key parameter in the storage process under dynamic conditions. Three distinct reaction regimes were differentiated on the industrial materials under SO(x) trapping conditions being imperceptible from conventional spectra.
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Affiliation(s)
- Hendrik Dathe
- Department of Chemistry, Technische Universität München, Lichtenbergstr. 4, D-85747 Garching, Germany
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33
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Use of in situ FT-IR and XAS/XRD to study SO2 poisoning over model Pt/Ba/Al2O3 NOx storage and reduction (NSR) catalysts. Catal Today 2006. [DOI: 10.1016/j.cattod.2005.11.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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34
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Figueroa SJ, Requejo FG, Lede E, Lamaita L, Peluso MA, Sambeth JE. XANES study of electronic and structural nature of Mn-sites in manganese oxides with catalytic properties. Catal Today 2005. [DOI: 10.1016/j.cattod.2005.07.156] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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35
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Ciuparu D, Haider P, Fernandez-García M, Chen Y, Lim S, Haller GL, Pfefferle L. X-ray Absorption Spectroscopic Investigation of Partially Reduced Cobalt Species in Co−MCM-41 Catalysts during Synthesis of Single-Wall Carbon Nanotubes. J Phys Chem B 2005; 109:16332-9. [PMID: 16853076 DOI: 10.1021/jp052243p] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Chemometric tools were employed to analyze the in-situ dynamic X-ray absorption spectroscopy data to probe the state of Co-MCM-41 catalysts during reduction in pure hydrogen and under single-wall carbon nanotube synthesis reaction conditions. The use of the progressive correlation analysis established the sequence in which changes in the spectral features near the Co K edge occurred, and the evolving factor analysis provided evidence for the formation of an intermediate Co(1+) ionic species during reduction of the Co-MCM-41 catalyst in pure hydrogen up to 720 degrees C. This intermediate species preserves the tetrahedral environment in the silica framework and is resistant to complete reduction to the metal in H(2). While the Co(2+) species is resistant to reduction in pure CO, the intermediate Co(1+) species is more reactive in CO most likely forming cobalt carbonyl-like compounds with high mobility in the MCM-41. These mobile species are the precursors of the metallic clusters growing carbon nanotubes. Controlling the rates of each step of this two-stage reduction process is key to controlling the size of the metallic Co clusters formed in Co-MCM-41 catalysts.
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Affiliation(s)
- Dragos Ciuparu
- Department of Chemical Engineering, Yale University, P.O. Box 208286, New Haven, Connecticut, USA
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36
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Korolev YM, Gagarin SG. Correlation between the Phase and Maceral Compositions of Natural Coals. DOKLADY PHYSICAL CHEMISTRY 2005. [DOI: 10.1007/s10634-005-0031-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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37
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Dathe H, Jentys A, Lercher JA. Sulfate formation on SOx trapping materials studied by Cu and S K-edge XAFS. Phys Chem Chem Phys 2005; 7:1283-92. [DOI: 10.1039/b419077g] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Bazin D, Rehr JJ. Limits and Advantages of X-ray Absorption Near Edge Structure for Nanometer Scale Metallic Clusters. J Phys Chem B 2003. [DOI: 10.1021/jp0223051] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D. Bazin
- LURE, Bât. 209 D, Université Paris-Sud, 91405 ORSAY Cedex, France, and Department of Physics, University of Washington, Seattle, Washington 98195
| | - J. J. Rehr
- LURE, Bât. 209 D, Université Paris-Sud, 91405 ORSAY Cedex, France, and Department of Physics, University of Washington, Seattle, Washington 98195
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39
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Kim WB, Lee JS. Quantitative XANES Analysis of Cuprous Dibromide Complex Formed in the Oxidative Carbonylation of Phenols. J Phys Chem B 2003. [DOI: 10.1021/jp034627q] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Won Bae Kim
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Pohang 790-784, Korea
| | - Jae Sung Lee
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Pohang 790-784, Korea
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40
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Nature and catalytic role of active silver species in the lean NOx reduction with C3H6 in the presence of water. J Catal 2003. [DOI: 10.1016/s0021-9517(03)00055-1] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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41
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Prestipino C, Bordiga S, Lamberti C, Vidotto S, Garilli M, Cremaschi B, Marsella A, Leofanti G, Fisicaro P, Spoto G, Zecchina A. Structural Determination of Copper Species on the Alumina-Supported Copper Chloride Catalyst: A Detailed EXAFS Study. J Phys Chem B 2003. [DOI: 10.1021/jp027507b] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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42
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Lamberti C, Bordiga S, Bonino F, Prestipino C, Berlier G, Capello L, D'Acapito F, Llabrés i Xamena FX, Zecchina A. Determination of the oxidation and coordination state of copper on different Cu-based catalysts by XANES spectroscopy in situ or in operando conditions. Phys Chem Chem Phys 2003. [DOI: 10.1039/b305810g] [Citation(s) in RCA: 153] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Fernández-García M. XANES analysis of catalytic systems under reaction conditions. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 2002. [DOI: 10.1081/cr-120001459] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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44
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45
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Problems of structural characterization of oxide-type samples with X-ray absorption spectroscopy. Microchem J 2002. [DOI: 10.1016/s0026-265x(02)00006-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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46
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Yamaguchi A, Suzuki A, Shido T, Inada Y, Asakura K, Nomura M, Iwasawa Y. In Situ Time-Resolved Energy-Dispersive X-ray Absorption Fine Structure Study on the Decarbonylation Processes of Mo(CO)6 Entrapped in NaY and HY Zeolites. J Phys Chem B 2002. [DOI: 10.1021/jp0135499] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aritomo Yamaguchi
- Department of Chemistry, Graduate School of Science, the University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Research Center for Materials Science, Nagoya University, Nagoya 464-8602, Japan, Catalysis Research Center, Hokkaido University, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, KEK, Ibaraki 305-0801, Japan
| | - Akane Suzuki
- Department of Chemistry, Graduate School of Science, the University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Research Center for Materials Science, Nagoya University, Nagoya 464-8602, Japan, Catalysis Research Center, Hokkaido University, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, KEK, Ibaraki 305-0801, Japan
| | - Takafumi Shido
- Department of Chemistry, Graduate School of Science, the University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Research Center for Materials Science, Nagoya University, Nagoya 464-8602, Japan, Catalysis Research Center, Hokkaido University, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, KEK, Ibaraki 305-0801, Japan
| | - Yasuhiro Inada
- Department of Chemistry, Graduate School of Science, the University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Research Center for Materials Science, Nagoya University, Nagoya 464-8602, Japan, Catalysis Research Center, Hokkaido University, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, KEK, Ibaraki 305-0801, Japan
| | - Kiyotaka Asakura
- Department of Chemistry, Graduate School of Science, the University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Research Center for Materials Science, Nagoya University, Nagoya 464-8602, Japan, Catalysis Research Center, Hokkaido University, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, KEK, Ibaraki 305-0801, Japan
| | - Masaharu Nomura
- Department of Chemistry, Graduate School of Science, the University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Research Center for Materials Science, Nagoya University, Nagoya 464-8602, Japan, Catalysis Research Center, Hokkaido University, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, KEK, Ibaraki 305-0801, Japan
| | - Yasuhiro Iwasawa
- Department of Chemistry, Graduate School of Science, the University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Research Center for Materials Science, Nagoya University, Nagoya 464-8602, Japan, Catalysis Research Center, Hokkaido University, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, KEK, Ibaraki 305-0801, Japan
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Shaffer R, Cross J, Rose-Pehrsson S, Elam W. Speciation of chromium in simulated soil samples using X-ray absorption spectroscopy and multivariate calibration. Anal Chim Acta 2001. [DOI: 10.1016/s0003-2670(01)01004-2] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Anderson J, Fernández-García M. Use of IR and XANES to Monitor Catalysts During Preparation, Regeneration and Reaction. Chem Eng Res Des 2000. [DOI: 10.1205/026387600528184] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Izumi Y, Oyanagi H, Nagamori H. Site-Selective X-Ray Absorption Fine Structure (XAFS) Spectroscopy. (1) Design of Fluorescence Spectrometer and Emission Spectra. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2000. [DOI: 10.1246/bcsj.73.2017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Giacomelli L, Boggetti H, Agnelli H, Cattana R, Silber JJ. Factor analysis applied to the study of retention mechanism of nitroanilines in normal phase high performance liquid chromatography. Anal Chim Acta 1999. [DOI: 10.1016/s0003-2670(99)00540-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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