Synthesis of Pt-TM(transition metals) Catalysts and Their Hydrogenation Ability of Methyl Acrylate
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1217-Y08-34
Synthesis of Pt-TM(transition metals) catalysts and their hydrogenation ability of methyl acrylate AMARI, Miki1; OKADA, Satoshi1; DEMURA, Masahiko2; NISHIO, Keishi1; SHIBATA, Hirobumi1; KINERI, Tohru3; GUNJI Takahiro4; TAMURA Ryuji1 1 Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan 2 Fuel Cell Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan 3 Deparment of applied chemistry, Tokyo University of Science. Yamaguchi, 1-1-1 Daigakudori, Sanyo-Onoda, Yamaguchi 756-0884, Japan. 4 Department of science and engineering, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan ABSTRACT We have prepared a number of Pt-TM(transition metals) alloys with various TM elements and evaluated their catalytic abilities by means of hydrogenation of methyl acrylate. High catalytic activities are obtained when the crystalline structures are similar, i.e., fcc structure, indicating that the crystal structure of a catalyst plays an important role in hydrogenation of methyl acrylate. Furthermore, for a certain TM element, i.e., Mo, the catalytic activity is found to surpass that of Pt metal. INTRODUCTION Pt-TM alloys are of particular interest for various applications as catalysts [1-4]. In order to reduce the usage of Pt catalysts such as those in automobile, one straightforward way is to simply reduce the amount of Pt by alloying with other elements while keeping the catalytic performance as high as possible. Although the catalytic behavior is determined by the surface state of the alloys, the bulk crystalline structure is considered to play an important role in the state of the surface thorough the crystalline anisotropy. In this work, we have alloyed Pt metal with a number of transition elements (TMs) at a constant composition of Pt2TM, reducing the amount of Pt by 1/3 in an atomic ratio. The catalytic ability was evaluated by means of hydrogenation ability of methyl acrylate. High catalytic activities will be reported for similar crystalline structures, i.e., fcc structure, suggesting that the fcc structure is favorable when Pt alloys are used as catalysts. In addition, for a certain TM element, i.e., Mo, the catalytic activity is found to even surpass that of Pt powder. EXPERIMENTAL For the sample preparation, Pt-TM (TM=Sc,Ti,V,Zr,Nb,Mo,Hf,Ta,W) mother alloys were prepared by arc-melting under Ar atmosphere and then they were crushed into powder of
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