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Eggart D, Huang X, Zimina A, Yang J, Pan Y, Pan X, Grunwaldt JD. Operando XAS Study of Pt-Doped CeO 2 for the Nonoxidative Conversion of Methane. ACS Catal 2022. [DOI: 10.1021/acscatal.2c00092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel Eggart
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Xin Huang
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, 116023 Dalian, China
| | - Anna Zimina
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Jiuzhong Yang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, 42 South Hezuohua Road, 230029 Hefei, China
| | - Yang Pan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, 42 South Hezuohua Road, 230029 Hefei, China
| | - Xiulian Pan
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, 116023 Dalian, China
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Bu X, Ran J, Niu J, Ou Z, Tang L, Huang X. Reaction mechanism insights into CH4 catalytic oxidation on Pt13 cluster: A DFT study. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111891] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Effects of Hydrothermal Aging on CO and NO Oxidation Activity over Monometallic and Bimetallic Pt-Pd Catalysts. Catalysts 2021. [DOI: 10.3390/catal11030300] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
By combining scanning transmission electron microscopy, CO chemisorption, and energy dispersive X-ray spectroscopy with CO and NO oxidation light-off measurements we investigated deactivation phenomena of Pt/Al2O3, Pd/Al2O3, and Pt-Pd/Al2O3 model diesel oxidation catalysts during stepwise hydrothermal aging. Aging induces significant particle sintering that results in a decline of the catalytic activity for all catalyst formulations. While the initial aging step caused the most pronounced deactivation and sintering due to Ostwald ripening, the deactivation rates decline during further aging and the catalyst stabilizes at a low level of activity. Most importantly, we observed pronounced morphological changes for the bimetallic catalyst sample: hydrothermal aging at 750 °C causes a stepwise transformation of the Pt-Pd alloy via core-shell structures into inhomogeneous agglomerates of palladium and platinum. Our study shines a light on the aging behavior of noble metal catalysts under industrially relevant conditions and particularly underscores the highly complex transformation of bimetallic Pt-Pd diesel oxidation catalysts during hydrothermal treatment.
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Eggart D, Zimina A, Cavusoglu G, Casapu M, Doronkin DE, Lomachenko KA, Grunwaldt JD. Versatile and high temperature spectroscopic cell for operando fluorescence and transmission x-ray absorption spectroscopic studies of heterogeneous catalysts. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:023106. [PMID: 33648105 DOI: 10.1063/5.0038428] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 01/15/2021] [Indexed: 06/12/2023]
Abstract
A modular high-temperature cell consisting of a plug-flow microreactor with a fixed catalyst bed and long heating zone has been established for operando x-ray absorption/fluorescence spectroscopic and diffraction studies. The functionality of the cell is demonstrated for two important areas: emission control using 2 wt. % Pd/Al2O3 acting as a three-way catalyst and direct conversion of methane to olefins and aromatics on a 0.5% Fe/SiO2 catalyst. The performance has been determined by online infrared spectroscopy and mass spectrometry, respectively. In addition, the cell can be combined with optical spectroscopy, such as Raman spectroscopy. The catalyst, present as powdered/sieved samples, can be measured under reaction conditions at temperatures of up to 1050 °C. Another key aspect is a long isothermal heating zone with a small temperature gradient (<3 °C/mm at 1000 °C without reaction) including an inert zone for pre-heating of the reactant gas. Due to the small size of the microreactor and the heating system including a water cooling system, heating/cooling rates of up to 100 °C/min can be achieved. Moreover, due to the compact design and the autonomous control system, the high temperature operando setup fits to the space at the majority of synchrotron beamlines. In many cases, the concentration of the element of interest in the catalysts is low requiring x-ray absorption spectroscopy measurements in the fluorescence measurement mode. Hence, the microreactor was designed to fit such needs as well. More specifically, the case of Fe-containing catalysts was particularly considered by using iron-free materials for the reactor housing.
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Affiliation(s)
- Daniel Eggart
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Anna Zimina
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Gülperi Cavusoglu
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Maria Casapu
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Dmitry E Doronkin
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Kirill A Lomachenko
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
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Müller S, Zimina A, Steininger R, Flessau S, Osswald J, Grunwaldt JD. High Stability of Rh Oxide-Based Thermoresistive Catalytic Combustion Sensors Proven by Operando X-ray Absorption Spectroscopy and X-ray Diffraction. ACS Sens 2020; 5:2486-2496. [PMID: 32627540 DOI: 10.1021/acssensors.0c00712] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Thermoresistive catalytic combustion sensors based on noble metals are very stable stable and highly sensitive devices to monitor potentially explosive atmospheres. We studied and proved the high stability of rhodium oxide-based sensors under working conditions in different CH4/air mixtures (up to 3.5 vol % methane) with the help of operando X-ray-based characterization techniques, DC resistance measurements, and IR thermography using a specially designed in situ cell. Operando X-ray diffraction and X-ray absorption spectroscopy showed that the active Rh species are in the oxidized state and their chemical state is preserved during operation under realistic conditions. The resistance correlated with the surface temperature of the pellistor and is related to the combustion of CH4, confirming the catalytic nature of the observed sensing process. Only under harsh operation conditions such as an oxygen-free atmosphere or enhanced working current, a reduction in the active Rh2O3 phase was observed. Finally, the effect of poisoning causing the lowered activity on the catalytic combustion of methane was investigated. While stable rhodium sulfate might form in a sulfur-poisoned pellistor, silicon dioxide seems to additionally physically block the pores in the alumina ceramics of the pellistor poisoned by hexamethyldisiloxane.
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Affiliation(s)
- Sabrina Müller
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Karlsruhe 76131, Germany
| | - Anna Zimina
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Karlsruhe 76131, Germany
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany
| | - Ralph Steininger
- Institute for Photon Science, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany
| | | | | | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Karlsruhe 76131, Germany
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany
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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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7
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Structure-activity relationship in Pd/CeO2 methane oxidation catalysts. CHINESE JOURNAL OF CATALYSIS 2020. [DOI: 10.1016/s1872-2067(19)63510-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Martinovic F, Tran QN, Deorsola FA, Bensaid S, Palkovits R, Paulus W, Bonelli B, Di Renzo F, Pirone R. SO2 deactivation mechanism of NO oxidation and regeneration of the LaCoO3 perovskite. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02478f] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The deactivation mechanism and methods to cope with the poisoning by SO2 of a LaCoO3 perovskite-based NO oxidation catalyst were investigated.
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Affiliation(s)
- Ferenc Martinovic
- Politecnico di Torino
- Department of Applied Science and Technology
- 10129 Torino
- Italy
- Institut für Technische und Makromolekulare Chemie
| | - Quang Nguyen Tran
- Politecnico di Torino
- Department of Applied Science and Technology
- 10129 Torino
- Italy
- Institut Charles Gerhardt
| | | | - Samir Bensaid
- Politecnico di Torino
- Department of Applied Science and Technology
- 10129 Torino
- Italy
| | - Regina Palkovits
- Institut für Technische und Makromolekulare Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | - Werner Paulus
- Institut Charles Gerhardt
- Université de Montpellier-CNRS-ENSCM
- 34095 Montpellier
- France
| | - Barbara Bonelli
- Politecnico di Torino
- Department of Applied Science and Technology
- 10129 Torino
- Italy
| | - Francesco Di Renzo
- Institut Charles Gerhardt
- Université de Montpellier-CNRS-ENSCM
- 34095 Montpellier
- France
| | - Raffaele Pirone
- Politecnico di Torino
- Department of Applied Science and Technology
- 10129 Torino
- Italy
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Yuan K, Zhang YW. Engineering well-defined rare earth oxide-based nanostructures for catalyzing C1 chemical reactions. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00750a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In this review, we summarize the nanostructural engineering and applications of rare earth oxide-based nanomaterials with well-defined compositions, crystal phases and shapes for efficiently catalyzing C1 chemical reactions.
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Affiliation(s)
- Kun Yuan
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry
- College of Chemistry and Molecular Engineering
- Peking University
| | - Ya-Wen Zhang
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry
- College of Chemistry and Molecular Engineering
- Peking University
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