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Chem Asian J ; 8(5): 919-25, 2013 May.
Artículo en Inglés | MEDLINE | ID: mdl-23468235

RESUMEN

A systematic study on the selective semihydrogenation of alkynes to alkenes on shape-controlled palladium (Pd) nanocrystals was performed. Pd nanocrystals with a cubic shape and thus exposed {100} facets were synthesized in an aqueous solution through the reduction of Na2PdCl4 with L-ascorbic acid in the presence of bromide ions. The Pd nanocubes were tested as catalysts for the semihydrogenation of various alkynes such as 5-decyne, 2-butyne-1,4-diol, and phenylacetylene. For all substrates, the Pd nanocubes exhibited higher alkene selectivity (>90 %) than a commercial Pd/C catalyst (75-90 %), which was attributed to a large adsorption energy of the carbon-carbon triple bond on the {100} facets of the Pd nanocubes. Our approach based on the shape control of Pd nanocrystals offers a simple and effective route to the development of a highly selective catalyst for alkyne semihydrogenation.


Asunto(s)
Alquenos/síntesis química , Alquinos/química , Nanopartículas/química , Paladio/química , Alquenos/química , Hidrogenación , Estructura Molecular , Tamaño de la Partícula , Propiedades de Superficie
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