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Size and Shape‐controlled Pd Nanocrystals on ZnO and SiO 2 : When the Nature of the Support Determines the Active Phase
Author(s) -
CrespoQuesada Micaela,
Yoon Songhak,
Jin Mingshang,
Xia Younan,
Weidenkaff Anke,
KiwiMinsker Lioubov
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201301043
Subject(s) - octahedron , nanocrystal , acetylene , phase (matter) , materials science , redox , palladium , catalysis , carbide , crystallography , chemical engineering , inorganic chemistry , photochemistry , chemistry , crystal structure , nanotechnology , organic chemistry , metallurgy , engineering
The structure sensitivity of acetylene hydrogenation was studied over size‐controlled cubic and octahedral Pd nanocrystals (NCs) supported on ZnO and SiO 2 . Acetylene hydrogenation was found to be structure sensitive [with Pd(1 1 1) in octahedra being more active than Pd(1 0 0) in cubes]. However, the response was found to vary depending on the redox properties of the support. The catalytically active and selective palladium carbide (PdC x ) phase was readily formed on the SiO 2 ‐supported Pd NCs (much faster on cubes than on octahedra), whereas a markedly less active PdZn phase was preferentially formed on the ZnO‐supported Pd nanocrystals. Here we show that the structure sensitivity of a chemical reaction is a complex phenomenon that originates from the reconstruction of the active phase in response to the reactive environment, which is ultimately determined by the support used.