1
|
Reichle S, Kang L, Demirbas D, Weidenthaler C, Felderhoff M, DeBeer S, Schüth F. Mechanocatalytic Synthesis of Ammonia: State of the Catalyst During Reaction and Deactivation Pathway. Angew Chem Int Ed Engl 2024; 63:e202317038. [PMID: 38372407 DOI: 10.1002/anie.202317038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 01/31/2024] [Accepted: 02/02/2024] [Indexed: 02/20/2024]
Abstract
Ammonia synthesis holds significant importance for both agricultural fertilizer production and emerging green energy applications. Here, we present a comprehensive characterization of a catalyst for mechanochemical ammonia synthesis, based on Cs-promoted Fe. The study sheds light on the catalyst's dynamic evolution under reaction conditions and the origin of deactivation. Initially, elemental Cs converts to CsH, followed by partial CsOH formation due to trace oxygen impurities on the surface of the Fe metal and the equipment. Concurrently, the mechanical milling process comminutes Fe, exposing fresh metallic Fe surfaces. This comminution correlates with an induction period observed during ammonia formation. Critical to the study, degradation of active Cs promoter species (CsH and CsNH2) into inactive CsOH emerged as the primary deactivation mechanism. By increasing the Cs content from 2.2 mol % to 4.2 mol %, we achieved stable, continuous ammonia synthesis for nearly 90 hours, showcasing one of the longest-running mechanocatalytic gas phase reactions. Studies of the temperature dependence of the reaction revealed negligible bulk temperature influence in the range of -10 °C to 100 °C, highlighting the dominance of mechanical action over bulk thermal effects. This study offers insights into the complex interplay between mechanical processing, reactive species, and deactivation mechanisms in mechanocatalytic ammonia synthesis.
Collapse
Affiliation(s)
- Steffen Reichle
- Department of Heterogeneous Catalysis/, Department of Molecular Theory and Spectroscopy (JWS), Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
| | - Liqun Kang
- Department of Inorganic Spectroscopy, Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Derya Demirbas
- Department of Heterogeneous Catalysis/, Department of Molecular Theory and Spectroscopy (JWS), Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
| | - Claudia Weidenthaler
- Department of Heterogeneous Catalysis/, Department of Molecular Theory and Spectroscopy (JWS), Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
| | - Michael Felderhoff
- Department of Heterogeneous Catalysis/, Department of Molecular Theory and Spectroscopy (JWS), Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Department of Inorganic Spectroscopy, Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Ferdi Schüth
- Department of Heterogeneous Catalysis/, Department of Molecular Theory and Spectroscopy (JWS), Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
| |
Collapse
|
2
|
Pota G, Silvestri B, Vitiello G, Gallucci N, Di Girolamo R, Scialla S, Raucci MG, Ambrosio L, Di Napoli M, Zanfardino A, Varcamonti M, Pezzella A, Luciani G. Towards nanostructured red-ox active bio-interfaces: Bioinspired antibacterial hybrid melanin-CeO 2 nanoparticles for radical homeostasis. BIOMATERIALS ADVANCES 2023; 153:213558. [PMID: 37467646 DOI: 10.1016/j.bioadv.2023.213558] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 05/29/2023] [Accepted: 07/08/2023] [Indexed: 07/21/2023]
Abstract
Redox-active nano-biointerfaces are gaining weight in the field of regenerative medicine since they can act as enzymes in regulating physiological processes and enabling cell homeostasis, as well as the defense against pathogen aggression. In particular, cerium oxide nanoparticles (CeO2 NPs) stand as intriguing enzyme-mimicking nanoplatforms, owing to the reversible Ce+3/Ce+4 surface oxidation state. Moreover, surface functionalization leads to higher catalytic activity and selectivity, as well as more tunable enzyme-mimicking performances. Conjugation with melanin is an adequate strategy to boost and enrich CeO2 NPs biological features, because of melanin redox properties accounting for intrinsic antioxidant, antimicrobial and anti-inflammatory power. Herein, hybrid Melanin/CeO2 nanostructures were designed by simply coating the metal-oxide nanoparticles with melanin chains, obtained in-situ through ligand-to-metal charge transfer mechanism, according to a bioinspired approach. Obtained hybrid nanostructures underwent detailed physico-chemical characterization. Morphological and textural features were investigated through TEM, XRD and N2 physisorption. The nature of nanoparticle-melanin interaction was analyzed through FTIR, UV-vis and EPR spectroscopy. Melanin-coated hybrid nanostructures exhibited a relevant antioxidant activity, confirmed by a powerful quenching effect for DPPH radical, reaching 81 % inhibition at 33 μg/mL. A promising anti-inflammatory efficacy of the melanin-coated hybrid nanostructures was validated through a significant inhibition of BSA denaturation after 3 h. Meanwhile, the enzyme-mimicking activity was corroborated by a prolonged peroxidase activity after 8 h at 100 μg/mL and a relevant catalase-like action, by halving the H2O2 level in 30 min at 50 μg/mL. Antimicrobial assays attested that conjugation with melanin dramatically boosted CeO2 biocide activity against both Gram (-) and Gram (+) strains. Cytocompatibility tests demonstrated that the melanin coating not only enhanced the CeO2 nanostructures biomimicry, resulting in improved cell viability for human dermal fibroblast cells (HDFs), but mostly they proved that Melanin-CeO2 NPs were able to control the oxidative stress, modulating the production of nitrite and reactive oxygen species (ROS) levels in HDFs, under physiological conditions. Such remarkable outcomes make hybrid melanin-CeO2 nanozymes, promising redox-active interfaces for regenerative medicine.
Collapse
Affiliation(s)
- Giulio Pota
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio 80, 80125 Naples, Italy
| | - Brigida Silvestri
- Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, Via Claudio 21, 80125 Naples, Italy
| | - Giuseppe Vitiello
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio 80, 80125 Naples, Italy; CSGI, Center for Colloid and Surface Science, via della Lastruccia 3, 50019 Sesto Fiorentino, FI, Italy
| | - Noemi Gallucci
- Department of Chemical Sciences, University of Naples Federico II Via Cinthia 4, 80126 Naples, Italy
| | - Rocco Di Girolamo
- Department of Chemical Sciences, University of Naples Federico II Via Cinthia 4, 80126 Naples, Italy
| | - Stefania Scialla
- Institute for Polymers Composites and Biomaterials (IPCB) CNR Via Campi Flegrei 34, I-80078 Pozzuoli, NA, Italy
| | - Maria Grazia Raucci
- Institute for Polymers Composites and Biomaterials (IPCB) CNR Via Campi Flegrei 34, I-80078 Pozzuoli, NA, Italy
| | - Luigi Ambrosio
- Institute for Polymers Composites and Biomaterials (IPCB) CNR Via Campi Flegrei 34, I-80078 Pozzuoli, NA, Italy
| | - Michela Di Napoli
- Department of Biology, University of Naples Federico II Via Cinthia 4, 80126 Naples, Italy
| | - Anna Zanfardino
- Department of Biology, University of Naples Federico II Via Cinthia 4, 80126 Naples, Italy
| | - Mario Varcamonti
- Department of Biology, University of Naples Federico II Via Cinthia 4, 80126 Naples, Italy
| | - Alessandro Pezzella
- Institute for Polymers Composites and Biomaterials (IPCB) CNR Via Campi Flegrei 34, I-80078 Pozzuoli, NA, Italy; Department of Physics "Ettore Pancini", University of Naples Federico II Via Cinthia 4, 80126 Naples, Italy; National Interuniversity Consortium of Materials Science and Technology (INSTM), Via G. Giusti, 9, 50121 Florence, Italy
| | - Giuseppina Luciani
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio 80, 80125 Naples, Italy.
| |
Collapse
|
3
|
Özkan E, Badaczewski F, Cop P, Werner S, Hofmann A, Votsmeier M, Amenitsch H, Smarsly BM. Peering into the Formation of Cerium Oxide Colloidal Particles in Solution by In Situ Small-Angle X-ray Scattering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:9175-9190. [PMID: 32659089 DOI: 10.1021/acs.langmuir.0c01463] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The formation of CeO2 colloidal particles upon heating an aqueous solution of (NH4)2Ce(NO3)6 to 100 °C was investigated by time-resolved in situ SAXS analysis using synchrotron radiation, providing absolute intensity data. In particular, the experiments were performed by applying different temperatures between room temperature and 100 °C as well as under variation of the ionic strength and concentration. Using validated SAXS evaluation tools (SASfit and McSAS software), the analyses revealed the presence of two types of particle populations possessing average dimensions of ca. 2 nm and 5-15 nm, with the latter being agglomerates of the 2 nm particles rather than single crystallites. The analysis revealed not only the changes in the size, but also the relative volume fractions of these two CeO2 particle populations as a function of the aforementioned parameters. Increasing the temperature increases the number of the 5-15 nm agglomerates on one hand by the enhanced nucleation rate of the primary particles. On the other hand, especially at high temperatures (90 and 100 °C) the larger agglomerate particles precipitate, resulting in interesting trends in the fractions of the two populations as a function of time, temperature, ionic strength, and precursor concentration. The experimental studies are complemented by calculating colloidal interaction energies based on classical DLVO theory. Thereby, this study provides detailed insight into the nucleation, growth, and agglomeration of CeO2 nanoparticles. The primary objective of this study is to provide a better understanding of the nucleation and growth of particles by the hydrolysis of the tetravalent cerium ion in aqueous solutions.
Collapse
Affiliation(s)
- Elifkübra Özkan
- Institute of Physical Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Umicore AG & Co. KG, Rodenbacher Chaussee 4, 63457 Hanau, Germany
| | - Felix Badaczewski
- Institute of Physical Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Center for Materials Research (LaMa), Justus-Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
| | - Pascal Cop
- Institute of Physical Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Sebastian Werner
- Institute of Physical Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | | | - Martin Votsmeier
- Umicore AG & Co. KG, Rodenbacher Chaussee 4, 63457 Hanau, Germany
- Technical University Darmstadt, 64287 Darmstadt, Germany
| | - Heinz Amenitsch
- Institute of Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Bernd M Smarsly
- Institute of Physical Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Center for Materials Research (LaMa), Justus-Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
| |
Collapse
|
4
|
Ahmad SI, Koteshwar Rao P, Syed IA. Sintering temperature effect on density, structural and morphological properties of Mg- and Sr-doped ceria. JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE 2018. [DOI: 10.1016/j.jtusci.2015.04.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Syed Ismail Ahmad
- Department of Basic Sciences – Physics Division, Ibn Sina National College, Jeddah, Saudi Arabia
| | - P. Koteshwar Rao
- Centre for Nano Science and Technology, IST, JNTU Hyderabad, India
| | - Iizhar Ahmed Syed
- Department of Pharmaceutics, Ibn Sina National College, Jeddah, Saudi Arabia
| |
Collapse
|
5
|
Cresi JSP, Chiara Spadaro M, D'Addato S, Valeri S, Amidani L, Boscherini F, Bertoni G, Deiana D, Luches P. Contraction, cation oxidation state and size effects in cerium oxide nanoparticles. NANOTECHNOLOGY 2017; 28:495702. [PMID: 29016361 DOI: 10.1088/1361-6528/aa926f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
An accurate description of the structural and chemical modifications of cerium oxide nanoparticles (NPs) is mandatory for understanding their functionality in applications. In this work we investigate the relation between local atomic structure, oxidation state, defectivity and size in cerium oxide NPs with variable diameter below 10 nm, using x-ray absorption fine structure analysis in the near and extended energy range. The NPs are prepared by physical methods under controlled conditions and analyzed in morphology and crystalline quality by high resolution transmission electron microscopy. We resolve here an important question on the local structure of cerium oxide NPs: we demonstrate a progressive contraction in the Ce-O interatomic distance with decreasing NP diameter and we relate the observed effect to the reduced dimensionality. The contraction is not significantly modified by inducing a 4%-6% higher Ce3+ concentration through thermal annealing in high vacuum. The consequences of the observed average cation-anion distance contraction on the properties of the NPs are discussed.
Collapse
Affiliation(s)
- Jacopo Stefano Pelli Cresi
- Dipartimento di Scienze Fisiche Informatiche e Matematiche, Università degli Studi di Modena e Reggio Emilia, Via G. Campi 213/a, I-41125, Modena, Italy. Istituto Nanoscienze, Consiglio Nazionale delle Ricerche, Via G. Campi 213/a, I-41125, Modena, Italy
| | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Marsh JL, Wayman AE, Smiddy NM, Campbell DJ, Parker JC, Bosma WB, Remsen EE. Infrared Spectroscopic Analysis of the Adsorption of Pyridine Carboxylic Acids on Colloidal Ceria. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13224-13233. [PMID: 29112427 DOI: 10.1021/acs.langmuir.7b03338] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Surface adsorption of a homologous series of pyridine carboxylic acids on a hydrated colloidal cerium dioxide (ceria) film is characterized using the combination of experimental and computationally determined infrared (IR) spectra. Experimental analyses employ attenuated total reflectance (ATR) IR spectroscopy of deposited colloidal ceria thin films equilibrated with three pyridine carboxylic acids at pH 3.0, 5.5, and 8.5. The corresponding computational IR spectra for the energy-minimized intermediate and base forms of the pyridine carboxylic acids use density functional theory calculations at the B3LYP/6-311++G** level of theory. Solvent effects are modeled using both the COSMO implicit solvation model and the inclusion of explicit water molecules. Experimental IR spectra show that the adsorptive interactions between the pyridine carboxylic acids and ceria surface are due to the outer-sphere coordination of cerium ions in the films. Vibrational assignments based on combined experimental and computational results indicate that both pyridyl ring nitrogen and carboxylate functional groups account for the interaction of pyridine carboxylic acids at ceria surfaces. Experimentally determined Langmuir constants point to the intermediate form of picolinic acid (pyridine-2-carboxylic acid) as having the strongest adsorption to ceria compared to the other pyridine carboxylic acids investigated. The enhanced adsorption of picolinic acid is attributed to the adjacency of the protonated pyridyl nitrogen and the carboxylate group relative to nicotinic acid (pyridine-3-carboxylic acid) and isonicotinic acid (pyridine-4-carboxylic acid).
Collapse
Affiliation(s)
- Jamie L Marsh
- Mund-Lagowski Department of Chemistry and Biochemistry, Bradley University , 1501 West Bradley Avenue, Peoria, Illinois 61625, United States
| | - Ashley E Wayman
- Mund-Lagowski Department of Chemistry and Biochemistry, Bradley University , 1501 West Bradley Avenue, Peoria, Illinois 61625, United States
| | - Nicole M Smiddy
- Mund-Lagowski Department of Chemistry and Biochemistry, Bradley University , 1501 West Bradley Avenue, Peoria, Illinois 61625, United States
| | - Dean J Campbell
- Mund-Lagowski Department of Chemistry and Biochemistry, Bradley University , 1501 West Bradley Avenue, Peoria, Illinois 61625, United States
| | - John C Parker
- Department of Physics, Lewis University , One University Parkway, Romeoville, Illinois 60446, United States
| | - Wayne B Bosma
- Mund-Lagowski Department of Chemistry and Biochemistry, Bradley University , 1501 West Bradley Avenue, Peoria, Illinois 61625, United States
| | - Edward E Remsen
- Mund-Lagowski Department of Chemistry and Biochemistry, Bradley University , 1501 West Bradley Avenue, Peoria, Illinois 61625, United States
| |
Collapse
|
7
|
Arena F, Deiana C, Lombardo AF, Ivanchenko P, Sakhno Y, Trunfio G, Martra G. Activity patterns of metal oxide catalysts in the synthesis of N-phenylpropionamide from propanoic acid and aniline. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01504e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivities of various oxide samples in the heterogeneous catalytic synthesis of N-phenylpropionamide from aniline and propanoic acid have been investigated and related to the different structure of adsorbed carboxylates.
Collapse
Affiliation(s)
- Francesco Arena
- Dipartimento di Ingegneria Elettronica
- Chimica e Ingegneria Industriale
- Università degli Studi di Messina
- 98166 Messina
- Italy
| | - Chiara Deiana
- Department of Chemistry and Centre for “Nanostructured Interfaces and Surfaces-NIS”
- University of Torino
- 10125 Torino
- Italy
| | - Agata F. Lombardo
- Dipartimento di Ingegneria Elettronica
- Chimica e Ingegneria Industriale
- Università degli Studi di Messina
- 98166 Messina
- Italy
| | - Pavlo Ivanchenko
- Department of Chemistry and Centre for “Nanostructured Interfaces and Surfaces-NIS”
- University of Torino
- 10125 Torino
- Italy
| | - Yuriy Sakhno
- Dipartimento di Ingegneria Elettronica
- Chimica e Ingegneria Industriale
- Università degli Studi di Messina
- 98166 Messina
- Italy
| | - Giuseppe Trunfio
- Dipartimento di Ingegneria Elettronica
- Chimica e Ingegneria Industriale
- Università degli Studi di Messina
- 98166 Messina
- Italy
| | - Gianmario Martra
- Department of Chemistry and Centre for “Nanostructured Interfaces and Surfaces-NIS”
- University of Torino
- 10125 Torino
- Italy
| |
Collapse
|
8
|
Mosivand S, Kazeminezhad I. Synthesis of electrocrystallized cobalt ferrite nanopowders by tuning the cobalt salt concentration. RSC Adv 2015. [DOI: 10.1039/c4ra17162d] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Cobalt ferrite nanopowders were electrocrystallized in an electrochemical cell containing two iron electrodes, and an electrolyte solution of cobalt sulphate.
Collapse
Affiliation(s)
- Saba Mosivand
- Physics Department
- Faculty of Science
- Lorestan University
- Iran
| | - Iraj Kazeminezhad
- Physics Department
- Faculty of Science
- Shahid Chamran University
- Ahvaz
- Iran
| |
Collapse
|
9
|
Ikeda-Ohno A, Hennig C, Weiss S, Yaita T, Bernhard G. Hydrolysis of tetravalent cerium for a simple route to nanocrystalline cerium dioxide: an in situ spectroscopic study of nanocrystal evolution. Chemistry 2013; 19:7348-60. [PMID: 23630017 DOI: 10.1002/chem.201204101] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 03/01/2013] [Indexed: 11/07/2022]
Abstract
Despite the rapid developments in recent nanocrystal research and their expanding applications, the evolution mechanism of nanocrystals remains veiled for the most part due to the lack of appropriate analytical techniques. Here we demonstrate one promising multi-spectroscopic approach for the in situ investigation of nanocrystal evolution. That is, the formation of nanocrystalline cerium dioxide (NC-CeO2) has been probed by dynamic light scattering (DLS), X-ray absorption spectroscopy (XAS) and high-energy X-ray scattering (HEXS). The obtained results indicate that the fine colloidal particles of NC-CeO2 are formed in an acidic aqueous solution simply through the hydrolysis of the initial precursor of small oligomer Ce(IV) species. This information on how NC-CeO2 evolves is fundamental to simplifying and alleviating the synthetic strategy for NC-CeO2 production.
Collapse
Affiliation(s)
- Atsushi Ikeda-Ohno
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, P.O.Box 510119, 01314 Dresden, Germany.
| | | | | | | | | |
Collapse
|
10
|
Bourja L, Bakiz B, Benlhachemi A, Ezahri M, Villain S, Favotto C, Valmalette JC, Gavarri J. Structural modifications of nanostructured ceria CeO2,xH2O during dehydration process. POWDER TECHNOL 2012. [DOI: 10.1016/j.powtec.2011.09.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
11
|
Sreeremya TS, Thulasi KM, Krishnan A, Ghosh S. A Novel Aqueous Route To Fabricate Ultrasmall Monodisperse Lipophilic Cerium Oxide Nanoparticles. Ind Eng Chem Res 2011. [DOI: 10.1021/ie2019646] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Thadathil S. Sreeremya
- Nanoceramics Division, National Institute for Interdisciplinary Science & Technology (NIIST), Council of Scientific & Industrial Research (CSIR), Trivandrum-695 019, India
| | - Kunnambeth M. Thulasi
- Nanoceramics Division, National Institute for Interdisciplinary Science & Technology (NIIST), Council of Scientific & Industrial Research (CSIR), Trivandrum-695 019, India
| | - Asha Krishnan
- Nanoceramics Division, National Institute for Interdisciplinary Science & Technology (NIIST), Council of Scientific & Industrial Research (CSIR), Trivandrum-695 019, India
| | - Swapankumar Ghosh
- Nanoceramics Division, National Institute for Interdisciplinary Science & Technology (NIIST), Council of Scientific & Industrial Research (CSIR), Trivandrum-695 019, India
| |
Collapse
|
12
|
Masson S, Holliman P, Kalaji M, Kluson P. The production of nanoparticulate ceria using reverse micelle sol gel techniques. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b820098j] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
13
|
Influence of the catalyst surface area on the activity and stability of Au/CeO2 catalysts for the low-temperature water gas shift reaction. Top Catal 2007. [DOI: 10.1007/s11244-007-0292-x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
14
|
Rivera-Ramos ME, Hernández-Maldonado AJ. Adsorption of N2 and CH4 by Ion-Exchanged Silicoaluminophosphate Nanoporous Sorbents: Interaction with Monovalent, Divalent, and Trivalent Cations. Ind Eng Chem Res 2007. [DOI: 10.1021/ie061016m] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Milton E. Rivera-Ramos
- Department of Chemical Engineering, University of Puerto RicoMayagüez Campus, Mayagüez, Puerto Rico 00681-9046
| | | |
Collapse
|
15
|
Andreescu D, Matijević E, Goia DV. Formation of uniform colloidal ceria in polyol. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2006.05.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|