Comparison of structure and catalytic performance of Pt-Co and Pt-Cu bimetallic catalysts supported on Al₂O₃ and CeO₂ synthesized by electron beam irradiation method for preferential CO oxidation

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• 作者：Junichiro Kugai^a ; ^{kugai@mit.eng.osaka-u.ac.jp} ; Toshiharu Moriya^a ; ^{t-moriya@mit.eng.osaka-u.ac.jp} ; Satoshi Seino^a ; ^{seino@mit.eng.osaka-u.ac.jp} ; Takashi Nakagawa^a ; ^{nakagawa@mit.eng.osaka-u.ac.jp} ; Yuji Ohkubo^a ; ^{okubo@mit.eng.osaka-u.ac.jp} ; Hiroaki Nitani^b ; ^{hiroaki.nitani@kek.jp} ; Takao A. Yamamoto^a ; ^{takao@mit.eng.osaka-u.ac.jp}
• 关键词：Pt&ndash ; Cu ; Pt&ndash ; Co ; Bimetallic catalysts ; Preferential oxidation ; PROX ; Electron beam irradiation method
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：15 April, 2013
• 年：2013
• 卷：38
• 期：11
• 页码：4456-4465
• 全文大小：1421 K

文摘

In order to investigate the effect of transition metal addition to platinum with different support materials on preferential CO oxidation, structure and chemical properties of supported bimetallic catalysts prepared by electron beam irradiation method were correlated to the catalytic performance. On Al₂O₃, decoration of Pt by small amount of Co (Co/Pt?¡«?0.03) drastically increased CO and O₂ conversions while addition of equimolar Cu to Pt increased them only above 100?¡ãC, where the rate-controlling factor was suggested to change from oxygen transport to CO activation. On CeO₂, either addition of Co or Cu to Pt?had minor or negative effect on high O₂ conversion inherent to high oxygen transport at Pt-CeO₂ interface. On Pt-Cu/CeO₂, however, metal-CuO_x interface dominates the reaction characteristics to give improved selectivity, which is suitable for deep CO removal in excess O₂/CO condition. The order of selectivity above 100?¡ãC, Pt-CoO_x?>?Pt(alloy)-CuO_x > Pt-CeO₂ interfaces, was derived from structural analysis and catalytic tests.