Abstract
AbstractThe shape sensitivity of monometallic Pt and bimetallic PtNi nanocrystals in α,β‐unsaturated aldehydes is studied by using a cubic shape enclosed by six {100} facets as well as an octahedral shape surrounded by eight {111} facets. Compared with monometallic Pt and bimetallic PtNi cubic/octahedral shapes, Pt3Ni cubes enhanced the selective hydrogenation of the CO double bond and suppressed the selective hydrogenation of the CC double bond of the α,β‐unsaturated aldehyde. The Pt, Pt3Ni, or PtNi octahedral shape is an unfavorable structure for CO hydrogenation and enables the activation of the whole conjugated system of the molecule, which leads to complete hydrogenation to form the saturated alcohol product. The synergistic effects of the surface structure and electronic properties of Pt or PtNi nanocrystals play a key role in controlling the selective hydrogenation of CC and CO bonds of α,β‐unsaturated aldehydes.
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