文献类型：期刊文献

英文题名：Maximizing the Pt-CuOx interface by trace Cu boosts CO preferential oxidation

作者：Lou, Ya-Ke[1,2,3];Chen, Zhi-Hao[1];Shen, Jia[1];Guo, Yang-Long[1];Zhan, Wang-Cheng[1];Wang, Ai-Yong[1];Divins, Nuria J.[2,3];Llorca, Jordi[2,3];Wang, Li[1];Guo, Yun[1]

机构：[1]East China Univ Sci & Technol, Res Inst Ind Catalysis, Sch Chem & Mol Engn, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 200237, Peoples R China;[2]Univ Politecn Cataluna, Inst Energy Technol, Dept Chem Engn, EEBE, Eduard Maristany 10-14, Barcelona 08019, Spain;[3]Univ Politecn Cataluna, Barcelona Res Ctr Multiscale Sci & Engn, EEBE, Eduard Maristany 10-14, Barcelona 08019, Spain

年份：2025

卷号：44

期号：8

起止页码：5868

外文期刊名：RARE METALS

收录：;EI(收录号：20251518192384);WOS:【SCI-EXPANDED(收录号:WOS:001460642400001)】；

基金：This work was financially supported by the National Key Research and Development Program of China (No. 2022YFB3504200), the National Natural Science Foundation of China (Nos. U21A20326 and 22376063), the fund of the National Engineering Laboratory for Mobile Source Emission Control Technology (No. NELMS2020A05) and the Fundamental Research Funds for the Central Universities. N.J.D. acknowledges the funding received from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No 897197. Y.L. (CSC No. 202006740085) is grateful for the grant from the China Scholarship Council. J.L. is grateful to the ICREA Academia program and grants MICINN/FEDER PID2021-124572OB-C31 and GC 2021 SGR 01061. This work is part of Maria de Maeztu Units of Excellence Programme CEX2023-001300-M / funded by MCIN/AEI / https://doi.org/10.13039/501100011033.

语种：英文

外文关键词：Copper - Platinum - Reaction intermediates

摘要：Preferential oxidation of CO (CO-PROX) in H-2-rich streams is highly important for purifying the industrial grade H-2 used in proton-exchange-membrane fuel cells (PEMFC), but it is still limited to a relatively narrow operation temperature window. In this study, the trace amounts of Cu are used to modify a Pt/Al2O3 catalyst. The introduced Cu2+ species are atomically anchored on Pt nanoparticles through strong electrostatic adsorption. The prepared Pt-Cu/Al2O3 catalyst with 0.011 wt% Cu loading achieves complete CO oxidation between 138 and 215 degrees C, while the maximum CO conversion of Pt/Al2O3 is only 94%. The characterization showed that the formation of the Pt-CuOx interface not only produced additional active sites for O-2 activation but also weakened the adsorption strength of CO due to Pt existing in an electron-deficient state. The synergy at the interface of Pt-CuOx inhibits the competitive adsorption of CO and O-2 on Pt nanoparticles. Compared with CO oxidation, the presence of H-2 in CO-PROX promotes CO oxidation through the formation of a formate (HCOO-) intermediate. The addition of Cu accelerates the HCOO- intermediate oxidation over Pt-Cu/Al2O3. The strategy of constructing metal-oxide interfacial sites sheds light on designing better catalysts for the CO-PROX reaction.