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Inside Back Cover: Size and Shape‐controlled Pd Nanocrystals on ZnO and SiO 2 : When the Nature of the Support Determines the Active Phase (ChemCatChem 3/2014)
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 - Reports
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201490019
Subject(s) - palladium , octahedron , nanocrystal , acetylene , catalysis , materials science , phase (matter) , carbide , cover (algebra) , chemical engineering , crystallography , inorganic chemistry , chemistry , nanotechnology , crystal structure , metallurgy , organic chemistry , mechanical engineering , engineering
Combined effects for improved catalysis! The cover picture shows the evolution of the active phase of shape‐controlled palladium nanocrystals (NCs) during acetylene hydrogenation, depending on the nature of the support. In their Communication on p. 767 ff., M. Crespo‐Quesada, S. Yoon et al. show that the structure sensitivity of a chemical reaction is a complex phenomenon that originates from the reconstruction of the Pd‐NCs in response to the reactive environment. This reconstruction is sensitive to the support used. Indeed, acetylene hydrogenation is a structure‐sensitive reaction [Pd(111) in octahedra is more active than Pd(100) in cubes]. However, the catalytically active and selective palladium carbide (PdC x ) phase was readily formed in Pd‐NCs on the SiO 2 (much faster on Pd cubes than on Pd octahedra), whereas a markedly less active PdZn phase was formed on the ZnO‐supported Pd NCs.