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Li B, Wang Q, Zhu J, Yang G, Liu H, Zhang Q, Weng W, Wan H. An Efficient Approach for the Synthesis of Pd Nanoparticles via Modifying Al
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with Cellulose and Its Application for CO Oxidation. ChemCatChem 2021. [DOI: 10.1002/cctc.202101333] [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)
- Bing Li
- Key Laboratory of Functional Molecular Solids Ministry of Education School of Chemistry and Materials Science Anhui Normal University Wuhu 241000 P. R. China
| | - Qiaoying Wang
- Key Laboratory of Functional Molecular Solids Ministry of Education School of Chemistry and Materials Science Anhui Normal University Wuhu 241000 P. R. China
| | - Jiaming Zhu
- Key Laboratory of Functional Molecular Solids Ministry of Education School of Chemistry and Materials Science Anhui Normal University Wuhu 241000 P. R. China
| | - Gang Yang
- Key Laboratory of Functional Molecular Solids Ministry of Education School of Chemistry and Materials Science Anhui Normal University Wuhu 241000 P. R. China
| | - Hualiang Liu
- Key Laboratory of Functional Molecular Solids Ministry of Education School of Chemistry and Materials Science Anhui Normal University Wuhu 241000 P. R. China
| | - Qing Zhang
- Key Laboratory of Functional Molecular Solids Ministry of Education School of Chemistry and Materials Science Anhui Normal University Wuhu 241000 P. R. China
| | - Weizheng Weng
- State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen University Xiamen 361005 P. R. China
| | - Huilin Wan
- State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen University Xiamen 361005 P. R. China
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CO2 Self-Poisoning and Its Mitigation in CuO Catalyzed CO Oxidation: Determining and Speeding up the Rate-Determining Step. Catalysts 2021. [DOI: 10.3390/catal11060654] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Cu-based catalysts are promising for CO oxidation applications with catalyst deactivation being a major barrier. We start with a CuO/Al2O3 catalyst and find that while the CO conversion decreases, CO2 accumulates and the average Cu chemical state stays the same. It suggests CO2 self-poisoning, i.e., CO2 desorption is the rate-determining step. Subsequently, experiments are performed to prove this hypothesis by showing (1) CO2 adsorption inhibits O2 adsorption, (2) complete desorption of CO2 regenerate the catalyst, (3) pre-adsorbed CO2 quenches catalyst activity which recovers during the reaction and (4) the apparent activation energy is consistent with CO2 desorption. It is further evidenced by using a stronger CO2 adsorbing support CeO2 to speed up CO2 desorption from the CuO sites resulting in a superior CuO/CeO2 catalyst. It provides an example for experimentally deciding and speeding up the rate-determining step in a catalytic reaction.
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