期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 37, 期 6, 页码 4787-4797出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2011.12.070
关键词
Pt-Cu catalyst; Bimetallic Pt-Cu; Preferential oxidation; PROX; Radiolytic process; Radiation-induced synthesis
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan [22241023]
- Ministry of Economy,Trade and Industry [22U5009]
- Grants-in-Aid for Scientific Research [22241023] Funding Source: KAKEN
CeO2-supported Pt-Cu bimetallic catalysts were synthesized by radiolytic process and their PROX activities were evaluated in relation to structural properties of the catalysts. Irradiating the aqueous precursor solution yielded Pt-Cu alloy nanoparticles and amorphous-like CuO on CeO2 which are thermodynamically stable products formed from reduced Pt and Cu. Addition of Cu to Pt significantly improved CO selectivity in PROX reaction. The Pt-Cu catalysts had wide temperature window for 100% CO conversion in contrast to very narrow window for monometallic Pt and Cu catalysts. Much lower light-off temperature for Pt-Cu catalysts than Cu catalyst revealed that Pt-Cu alloy surface is the active center. Regardless of the amount of CuO phase, the bimetallic catalyst exhibited high catalytic performance, which further revealed that Cu in close contact with Pt is responsible for the improved selectivity. The CuO phase was suggested to promote oxygen supply to CO chemisorbed on Pt-Cu alloy surface. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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