CuO role in γ-Fe2O3-supported Pt–Cu bimetallic nanoparticles synthesized by radiation-induced reduction as catalysts for preferential CO oxidation
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Modification of supported Pt catalyst by transition metal is effective for improving catalytic performance in fuel processing and electrochemical processes. In order to identify the role of CuO in Pt–Cu bimetallic nanoparticle catalyst in CO preferential oxidation in H2-rich gas, three γ-Fe2O3-supported Pt–Cu catalyst samples consisting of Pt–Cu alloy with different CuO content were synthesized by a radiolytic process. By managing the concentrations of the copper source and oxygen dissolved in the precursor solution, the CuO content was successfully varied by an order of magnitude without changing the structure and composition of the Pt–Cu alloy. In the catalytic tests, CuO-promoted CO oxidation significantly at around 100 °C. The catalyst with the highest CuO content showed the highest CO and O2 conversions. It was considered that the CuO phase promotes oxygen supply to CO chemisorbed on the Pt–Cu alloy surface. The alloy-CuO contact was suggested to be critical for the promoting effect.
KeywordsPt–Cu Bimetallic composite Radiolytic synthesis Preferential CO oxidation PROX
The authors thank Mr. K. Ueno (EBIS, Japan) for the provision of beam time of the electron accelerator and Dr. T. Akita (Advanced Industrial Science and Technology, Tsukuba) for TEM analysis. This research was partially supported by a Grant-in-Aid for Scientific Research (No. 22241023) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and by the R&D Project for Regional Innovation (No. 22U5009) from the Ministry of Economy, Trade and Industry.
- Liu XS, Korotkikh O, Farrauto R (2002) Selective catalytic oxidation of CO in H-2: structural study of Fe oxide-promoted Pt/alumina catalyst. Appl Catal A-Gen 226(1–2):293–303Google Scholar
- Tanaka K, Moro-oka Y, Ishigure K, Yajima T, Okabe Y, Kato Y, Hamano H, Sekiya S, Tanaka H, Matsumoto Y, Koinuma H, He H, Zhang CB, Feng QC (2004) A new catalyst for selective oxidation of CO in H-2: part 1, activation by depositing a large amount of FeOx on Pt/Al2O3 and Pt/CeO2 catalysts. Catal Lett 92(3–4):115–121. doi: 10.1023/B:CATL.0000014333.84509.1a CrossRefGoogle Scholar
- Woods RJ, Pikaev AK (1993) Applied radiation chemistry: radiation processing. Wiley, New YorkGoogle Scholar