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l ‐Arginine‐Triggered Self‐Assembly of CeO 2 Nanosheaths on Palladium Nanoparticles in Water
Author(s) -
Wang Xiao,
Zhang Yibo,
Song Shuyan,
Yang Xiangguang,
Wang Zhuo,
Jin Rongchao,
Zhang Hongjie
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201600625
Subject(s) - nanostructure , catalysis , materials science , palladium , nanoparticle , octahedron , chemical engineering , halide , nanotechnology , ion , inorganic chemistry , chemistry , organic chemistry , engineering
Pd@CeO 2 core–shell nanostructures with a tunable Pd core size, shape, and nanostructure as well as a tunable CeO 2 sheath thickness were obtained by a biomolecule‐assisted method. The synthetic process is simple and green, as it involves only the heating of a mixture of Ce(NO 3 ) 3 , l ‐arginine, and preformed Pd seeds in water without additives. Importantly, the synthesis is free of thiol groups and halide ions, thus providing a possible solution to the problem of secondary pollution by Pd nanoparticles in the sheath‐coating process. The Pd/CeO 2 nanostructures can be composited well with γ‐Al 2 O 3 to create a heterogeneous catalyst. In subsequent tests of catalytic NO reduction by CO, Pd@CeO 2 /Al 2 O 3 samples based on Pd cubes (6, 10, and 18 nm), Pd octahedra (6 nm), and Pd cuboctahedra (9 nm) as well as a simply loaded Pd cube (6 nm)–CeO 2 /Al 2 O 3 sample were used as catalysts to investigate the effects of the Pd core size and shape and the hybrid nanostructure on the catalytic performance.