Hydroxyls on CeO2 Support Promoting CuO/CeO2 Catalyst for Efficient CO Oxidation and NO Reduction by CO

Almousawi, Murtadha; Xie, Shaohua; Kim, Daekun; Ye, Kailong; Zhang, Xing; Loukusa, Jeremia; Ma, Lu; Ehrlich, Steven N.; Tetard, Laurene; Liu, Fudong

doi:10.1021/acs.est.3c06803

Hydroxyls on CeO₂ Support Promoting CuO/CeO₂ Catalyst for Efficient CO Oxidation and NO Reduction by CO

Journal Article · Fri Dec 22 00:00:00 EST 2023 · Environmental Science and Technology

DOI:https://doi.org/10.1021/acs.est.3c06803· OSTI ID:2432571

Almousawi, Murtadha ^[1]; ^[1]; Kim, Daekun ^[1]; Ye, Kailong ^[1]; Zhang, Xing ^[1]; ^[1]; Ma, Lu ^[2]; Ehrlich, Steven N. ^[2]; Tetard, Laurene ^[1]; ^[1]

Univ. of Central Florida, Orlando, FL (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Transition metal catalysts, such as copper oxide, are more attractive alternatives to noble metal catalysts for emission control due to their higher abundance, lower cost, and excellent catalytic activity. Here, in this study, we report the preparation and application of a novel CuO/CeO₂ catalyst using a hydroxyl-rich Ce(OH)_x support for CO oxidation and NO reduction by CO. Compared to the catalyst prepared from a regular CeO₂ support, the new CuO/CeO₂ catalyst prepared from the OH-rich Ce(OH)_x (CuO/CeO₂–OH) showed significantly higher catalytic activity under different testing conditions. The effect of OH species in the CeO₂ support on the catalytic performance and physicochemical properties of the CuO/CeO₂ catalyst was characterized in detail. It is demonstrated that the abundant OH species enhanced the CuO_x dispersion on CeO₂, increased the CuO_x–CeO₂ interfaces and surface defects, promoted the oxygen activation and mobility, and boosted the NO adsorption and dissociation on CuO/CeO₂–OH, thus contributing to its superior catalytic activity for both CO oxidation and NO reduction by CO. These results suggest that the OH-rich Ce(OH)_x is a superior support for the preparation of highly efficient metal catalysts for different applications.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704

OSTI ID:: 2432571

Report Number(s):: BNL--225949-2024-JAAM

Journal Information:: Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 1 Vol. 58; ISSN 0013-936X

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Copper-ceria catalyst
Cu dispersion
hydroxyl-rich Ce(OH)x
oxygen vacancy
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Hydroxyls on CeO2 Support Promoting CuO/CeO2 Catalyst for Efficient CO Oxidation and NO Reduction by CO

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Hydroxyls on CeO₂ Support Promoting CuO/CeO₂ Catalyst for Efficient CO Oxidation and NO Reduction by CO