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Structure Evolution and Associated Catalytic Properties of PtSn Bimetallic Nanoparticles
Author(s) -
Rong Hongpan,
Niu Zhiqiang,
Zhao Yafan,
Cheng Hao,
Li Zhi,
Ma Lei,
Li Jun,
Wei Shiqiang,
Li Yadong
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201501442
Subject(s) - bimetallic strip , nanoparticle , catalysis , materials science , chemical engineering , nanotechnology , chemistry , engineering , organic chemistry
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 PtSn NPs with tunable composition are prepared in a controllable manner. X‐ray characterizations reveal that their structures evolve from SnO 2− x ‐patched PtSn alloys to SnO 2− 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 (O vac ) sites, provided by SnO 2− x , drastically enhance the adsorption of carbonyl group.