title: Structure Evolution and Associated Catalytic Properties of Pt-Sn Bimetallic Nanoparticles.
abstract: Bimetallic nanoparticles (NPs) often show new catalytic properties that are different from those of the parent metals. Carefully exploring the structures of bimetallic NPs is a prerequisite for understanding the structure-associated properties. Herein, binary PtSn NPs with tunable composition are prepared in a controllable manner. X-ray characterizations reveal that their structures evolve from SnO2-x -patched PtSn alloys to SnO2-x -patched Pt clusters when more tin is incorporated. An obvious composition-dependent catalytic performance is observed for the hydrogenation of α,β-unsaturated aldehydes: the selectivity to unsaturated alcohol increases substantially at high tin content, whereas the reaction rate follows a volcano shape. Furthermore, Pt sites are responsible for hydrogen dissociation, whereas oxygen vacancy (Ovac ) sites, provided by SnO2-x , drastically enhance the adsorption of carbonyl group.
authors.affiliation: Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084 (P.R. China).
authors.forename: Hongpan
authors.initials: H
authors.lastname: Rong
authors.affiliation: Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084 (P.R. China). ydli@mail.tsinghua.edu.cn.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Niu
authors.affiliation: Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084 (P.R. China).
authors.forename: Yafan
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: National Synchrotron Radiation Laboratory and University of Science & Technology of China, Hefei, Anhui 230029 (P.R. China).
authors.forename: Hao
authors.initials: H
authors.lastname: Cheng
authors.affiliation: Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084 (P.R. China).
authors.forename: Zhi
authors.initials: Z
authors.lastname: Li
authors.affiliation: Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084 (P.R. China).
authors.forename: Lei
authors.initials: L
authors.lastname: Ma
authors.affiliation: Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084 (P.R. China).
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: National Synchrotron Radiation Laboratory and University of Science & Technology of China, Hefei, Anhui 230029 (P.R. China).
authors.forename: Shiqiang
authors.initials: S
authors.lastname: Wei
authors.affiliation: Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084 (P.R. China). zqniu@mail.tsinghua.edu.cn.
authors.forename: Yadong
authors.initials: Y
authors.lastname: Li
keywords: hydrogenation; nanoparticles; oxygen; platinum; tin