TY  - EJOUR
DO  - 10.1002/cctc.201301043
AB  - The structure sensitivity of acetylene hydrogenation was studied over size-controlled cubic and octahedral Pd nanocrystals (NCs) supported on ZnO and SiO2. Acetylene hydrogenation was found to be structure sensitive [with Pd(111) in octahedra being more active than Pd(100) in cubes]. However, the response was found to vary depending on the redox properties of the support. The catalytically active and selective palladium carbide (PdCx) phase was readily formed on the SiO2-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.
T1  - Size and Shape-controlled Pd Nanocrystals on ZnO and SiO2: When the Nature of the Support Determines the Active Phase
IS  - 3
DA  - 2014
AU  - Crespo-Quesada, Micaela
AU  - Yoon, Songhak
AU  - Jin, Mingshang
AU  - Xia, Younan
AU  - Weidenkaff, Anke
AU  - Kiwi-Minsker, Lioubov
JF  - Chemcatchem
SP  - 767-771
VL  - 6
EP  - 767-771
PB  - Wiley-VCH Verlag Berlin
PP  - Weinheim
ID  - 199686
KW  - acetylene
KW  - carbide
KW  - hydrogenation
KW  - nanocrystals
KW  - palladium
KW  - structure sensitivity
KW  - support effects
SN  - 1867-3880
ER  -