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Mortensen RL, Noack HD, Pedersen K, Mossin S, Mielby J. Recent advances in complete methane oxidation using zeolite‐supported metal nanoparticle catalysts. ChemCatChem 2022. [DOI: 10.1002/cctc.202101924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Rasmus Lykke Mortensen
- Technical University of Denmark: Danmarks Tekniske Universitet DTU Chemistry Kemitorvet 207 DK-2800 Kgs. Lyngby DENMARK
| | - Hendrik-David Noack
- Umicore Denmark ApS Stationary Catalysts Kogle Allé 1 DK-2970 Hørsholm DENMARK
| | - Kim Pedersen
- Umicore Denmark ApS Stationary Catalysts Kogle Allé 1 DK-2970 Hørsholm DENMARK
| | - Susanne Mossin
- Technical University of Denmark: Danmarks Tekniske Universitet DTU Chemistry DK-2800 Kgs. Lyngby DENMARK
| | - Jerrik Mielby
- Technical University of Denmark DTU Chemistry Kemitorvet 207 DK-2800 Kgs. Lyngby DENMARK
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Fertal DR, Monai M, Proaño L, Bukhovko MP, Park J, Ding Y, Weckhuysen BM, Banerjee AC. Calcination temperature effects on Pd/alumina catalysts: Particle size, surface species and activity in methane combustion. Catal Today 2021. [DOI: 10.1016/j.cattod.2021.08.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Atomic Structure of Pd-, Pt-, and PdPt-Based Catalysts of Total Oxidation of Methane: In Situ EXAFS Study. Catalysts 2021. [DOI: 10.3390/catal11121446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
In this study, 3%Pd/Al2O3, 3%Pt/Al2O3 and bimetallic (1%Pd + 2%Pt)/Al2O3 catalysts were examined in the total oxidation of methane in a temperature range of 150–400 °C. The evolution of the active component under the reaction conditions was studied by transmission electron microscopy and in situ extended X-ray absorption fine structure (EXAFS) spectroscopy. It was found that the platinum and bimetallic palladium-platinum catalysts are more stable against sintering than the palladium catalysts. For all the catalysts, the active component forms a “core-shell” structure in which the metallic core is covered by an oxide shell. The “core-shell” structure for the platinum and bimetallic palladium-platinum catalysts is stable in the temperature range of 150–400 °C. However, in the case of the palladium catalysts the metallic core undergoes the reversible oxidation at temperatures above 300 °C and reduced to the metallic state with the decrease in the reaction temperature. The scheme of the active component evolution during the oxidation of methane is proposed and discussed.
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Combination of reduction-deposition Pd loading and zeolite dealumination as an effective route for promoting methane combustion over Pd/Beta. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.07.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Huang W, Zhang X, Yang AC, Goodman ED, Kao KC, Cargnello M. Enhanced Catalytic Activity for Methane Combustion through in Situ Water Sorption. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02087] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Weixin Huang
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94305, United States
| | - Xinrui Zhang
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
| | - An-Chih Yang
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94305, United States
| | - Emmett D. Goodman
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94305, United States
| | - Kun-Che Kao
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94305, United States
| | - Matteo Cargnello
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94305, United States
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Karinshak KA, Lott P, Harold MP, Deutschmann O. In situ
Activation of Bimetallic Pd−Pt Methane Oxidation Catalysts. ChemCatChem 2020. [DOI: 10.1002/cctc.202000603] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kyle A. Karinshak
- Institute for Chemical Technology and Polymer Chemistry (ITCP)Karlsruhe Institute of Technology (KIT) Engesserstr. 20 76131 Karlsruhe Germany
- Department of Chemical and Biomolecular EngineeringUniversity of Houston 4726 Calhoun Rd Houston TX 77204-4004 USA
| | - Patrick Lott
- Institute for Chemical Technology and Polymer Chemistry (ITCP)Karlsruhe Institute of Technology (KIT) Engesserstr. 20 76131 Karlsruhe Germany
| | - Michael P. Harold
- Department of Chemical and Biomolecular EngineeringUniversity of Houston 4726 Calhoun Rd Houston TX 77204-4004 USA
| | - Olaf Deutschmann
- Institute for Chemical Technology and Polymer Chemistry (ITCP)Karlsruhe Institute of Technology (KIT) Engesserstr. 20 76131 Karlsruhe Germany
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Abstract
Palladium-based catalysts are known to provide high CH4 oxidation activity. One drawback for these materials is that they often lose activity in the presence of water vapor due to the formation of surface hydroxyls. It is however possible to improve the water vapor tolerance by using zeolites as support material. In this study, we have investigated Pd supported on thermally stable LTA zeolite with high framework Si/Al ratio (Si/Al = ~44) for CH4 oxidation and the effect of hydrothermal aging at temperatures up to 900 °C. High and stable CH4 oxidation activity in the presence of water vapor was observed for Pd/LTA after hydrothermal aging at temperatures ≤ 700 °C. However, aging at temperatures of 800–900 °C resulted in catalyst deactivation. This deactivation was not a result of structural collapse of the LTA zeolite as the LTA zeolite only showed minor changes in surface area, pore volume, and X-ray diffraction pattern after 900 °C aging. We suggest that the deactivation was caused by extensive formation of ion-exchanged Pd2+ together with Pd sintering. These two types of Pd species appear to have lower CH4 oxidation activity and to be more sensitive to water deactivation compared to the well dispersed Pd particles observed on the LTA support prior to the hydrothermal aging. By contrast, Pd/Al2O3 was generally sensitive to water vapor no matter of the aging temperature. Although the aging caused extensive Pd sintering in Pd/Al2O3, only minor deterioration of the CH4 oxidation activity was seen. The results herein presented show that Pd/LTA is a promising CH4 oxidation catalyst, however Pd rearrangement at high temperatures (≥800 °C) is one remaining challenge.
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Lin J, Chen X, Zheng Y, Huang F, Xiao Y, Zheng Y, Jiang L. Facile construction of ultrastable alumina anchored palladium catalysts via a designed one pot strategy for enhanced methane oxidation. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00727g] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A highly stable Pd–Al2O3 catalyst with anchored palladium species was facilely prepared through a one pot strategy for efficient methane oxidation.
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Affiliation(s)
- Jia Lin
- College of Chemistry and Materials Science
- Fujian Normal University
- Fuzhou
- P. R. China
| | - Xiaohua Chen
- College of Chemistry and Materials Science
- Fujian Normal University
- Fuzhou
- P. R. China
| | - Yong Zheng
- National Engineering Research Center of Chemical Fertilizer Catalyst
- Fuzhou University
- Fuzhou
- P. R. China
| | - Fei Huang
- College of Chemistry and Materials Science
- Fujian Normal University
- Fuzhou
- P. R. China
| | - Yihong Xiao
- National Engineering Research Center of Chemical Fertilizer Catalyst
- Fuzhou University
- Fuzhou
- P. R. China
| | - Ying Zheng
- College of Chemistry and Materials Science
- Fujian Normal University
- Fuzhou
- P. R. China
| | - Lilong Jiang
- National Engineering Research Center of Chemical Fertilizer Catalyst
- Fuzhou University
- Fuzhou
- P. R. China
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Comparative Study of the Characteristics and Activities of Pd/γ-Al2O3 Catalysts Prepared by Vortex and Incipient Wetness Methods. Catalysts 2019. [DOI: 10.3390/catal9040336] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
5 wt% Pd/γ-Al2O3 catalysts were prepared by a modified Vortex Method (5-Pd-VM) and Incipient Wetness Method (5-Pd-IWM), and characterized by various techniques (Inductively coupled plasma atomic emission spectroscopy (ICP-AES), N2-physisorption, pulse CO chemisorption, temperature programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), and X-ray diffraction (XRD)) under identical conditions. Both catalysts had similar particle sizes and dispersions; the 5-Pd-VM catalyst had 0.5 wt% more Pd loading (4.6 wt%). The surfaces of both catalysts contained PdO and PdOx with about 7% more PdOx in 5-Pd-VM. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and scanning electron microscope (SEM) images indicated presence of PdO/PdOx nanocrystals (8–10 nm) on the surface of the support. Size distribution by STEM showed presence of smaller nanoparticles (2–5 nm) in 5-Pd-VM. This catalyst was more active in the lower temperature range of 275–325 °C and converted 90% methane at 325 °C. The 5-Pd-VM catalyst was also very stable after 72-hour stability test at 350 °C showing 100% methane conversion, and was relatively resistant to steam deactivation. Hydrogen TPR of 5-Pd-VM gave a reduction peak at 325 °C indicating weaker interactions of the oxidized Pd species with the support. It is hypothesized that smaller particle sizes, uniform particle distribution, and weaker PdO/PdOx interactions with the support may contribute to the higher activity in 5-Pd-VM.
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Mihai O, Trandafilović L, Wentworth T, Torres FF, Olsson L. The Effect of Si/Al Ratio for Pd/BEA and Pd/SSZ-13 Used as Passive NOx Adsorbers. Top Catal 2018. [DOI: 10.1007/s11244-018-1017-z] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Huang W, Goodman ED, Losch P, Cargnello M. Deconvoluting Transient Water Effects on the Activity of Pd Methane Combustion Catalysts. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b01915] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Weixin Huang
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94304, United States
| | - Emmett D. Goodman
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94304, United States
| | - Pit Losch
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94304, United States
- Department of Heterogeneous Catalysis, Max-Planck-Institut Für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, Germany, 45470
| | - Matteo Cargnello
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94304, United States
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Low-Temperature Activity and PdO-PdOx Transition in Methane Combustion by a PdO-PdOx/γ-Al2O3 Catalyst. Catalysts 2018. [DOI: 10.3390/catal8070266] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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