Elucidation of Ce/Zr ratio effects on the physical properties and catalytic performance of CuOx/CeyZr1−yO2 catalysts

Sifat, Mohammed; Luchowski, Michal; Pophali, Amol; Jiang, Wenhui; Lu, Yunfan; Kim, Byeongseok; Kwon, Gihan; Yoon, Kwangsuk; Kim, Jihun; An, Kwangjin; Shim, Sang Eun; Song, Hocheol; Kim, Taejin

doi:10.1039/d4cy01012d

Elucidation of Ce/Zr ratio effects on the physical properties and catalytic performance of CuO_x/Ce_yZr_1−yO₂ catalysts

Journal Article · Mon Oct 28 04:00:00 EDT 2024 · Catalysis Science & Technology

DOI:https://doi.org/10.1039/d4cy01012d· OSTI ID:2587334

Sifat, Mohammed ^[1]; Luchowski, Michal ^[1]; ^[1]; Jiang, Wenhui ^[1]; Lu, Yunfan ^[1]; Kim, Byeongseok ^[2]; ^[3]; Yoon, Kwangsuk ^[4]; Kim, Jihun ^[5]; ^[5]; ^[2]; Song, Hocheol ^[4]; ^[1]

Stony Brook University, NY (United States)
Inha University, Incheon (Korea, Republic of)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Hanyang University, Seoul (Korea, Republic of)
Ulsan National Institute of Science and Technology (UNIST), Ulsan (Korea, Republic of)

Although cerium oxide (CeO₂) is widely used as a catalyst support, its limited defect sites and surface oxygen vacancy/mobility should be improved. The incorporation of zirconium (Zr) in the cerium (Ce) lattice is shown to increase the number of oxygen vacancies and improve catalytic activity. Using a fixed surface density (SD) of copper (∼2.3 Cu atoms per nm²) as a surface species, the role of the support (Ce_yZr_1−yO₂ (y = 1.0, 0.9, 0.6, 0.5, and 0.0)) and defect site effects in the CO oxidation reaction was investigated. Spectroscopic (e.g., Raman, XRD, XPS) and microscopic (e.g., SEM-EDX, HR-TEM) characterization techniques were applied to evaluate the defect sites, crystallite size, lattice parameters, chemical composition, oxidation states of elements and microstructure of the catalysts. Here, the CO oxidation reaction with varied CO : O₂ ratios (1 : 5, 1 : 1, and 1 : 0.5 (stoichiometric)) was used as a model reaction to describe the relationship between the structure and the catalytic performance of each catalyst. Based on the characterization results of Ce_yZr_1−yO₂ materials, the addition of Zr causes physical and chemical changes to the overall material. The inclusion of Zr into the structure of CeO₂ decreased the overall lattice parameter of the catalyst and increased the number of defect sites. The prepared catalysts were able to reach complete CO conversion (∼100%) at low temperature conditions (<200 °C), each showing varied reaction activity. The difference in CO oxidation activity was then analyzed and related to the structure, wherein Cu loading, surface oxygen vacancies, reduction–oxidation ability, CuO_x–support interaction and oxygen mobility in the catalyst were the crucial descriptors.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: SC0012704

OSTI ID:: 2587334

Alternate ID(s):: OSTI ID: 2480409

Report Number(s):: BNL--228849-2025-JAAM

Journal Information:: Catalysis Science & Technology, Journal Name: Catalysis Science & Technology Journal Issue: 24 Vol. 14; ISSN 2044-4761; ISSN 2044-4753

Publisher:: Royal Society of Chemistry (RSC)Copyright Statement

Country of Publication:: United States

Language:: English

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Influence of Scanning Parameters on X-Ray Diffraction Peaks of Copper Chakartnarodom, Parinya; Kongkajun, Nuntaporn; Laitila, Edward A. Key Engineering Materials, Vol. 751 https://doi.org/10.4028/www.scientific.net/KEM.751.202	journal	August 2017
Catalytic Soot Oxidation: Effect of Ceria-Zirconia Catalyst Particle Size Konstandopoulos, Athanasios G.; Pagkoura, Chrysoula; Lorentzou, Souzana SAE International Journal of Engines, Vol. 9, Issue 3 https://doi.org/10.4271/2016-01-0968	journal	April 2016

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