Vapour phase hydrogenation of crotonaldehyde over magnesia-supported platinum–tin catalysts

Literature Information

Publication Date 2001-03-29
DOI 10.1039/B100770J
Impact Factor 3.676
Authors

Narcís Homs, Jordi Llorca, Pilar Ramírez de la Piscina, Francisco Rodríguez-Reinoso, Antonio Sepúlveda-Escribano, Joaquín Silvestre-Albero


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Abstract

Magnesia-supported bimetallic Pt–Sn catalysts with various metal contents and Pt/Sn atomic ratios were prepared using the bimetallic complex cis-[PtCl(SnCl3)(PPh3)2] or the monometallic complex cis-[PtCl2(PPh3)2] and SnCl2 as metal precursors. Catalysts were characterised by X-ray diffraction, transmission electron microscopy techniques and X-ray photoelectron spectroscopy. The bulk and surface composition of the catalysts was related to the catalytic behaviour in the vapour phase hydrogenation of crotonaldehyde (but-2-enal). It is shown that the various preparation methods produce catalysts with distinct properties and catalytic behaviour. For catalysts prepared with the bimetallic complex, the highest selectivity for the unsaturated alcohol (but-2-en-1-ol) was achieved for the catalyst containing larger bimetallic particles, which are associated with a higher surface concentration of oxidised tin species. The catalyst prepared with separate metal precursors contains a higher amount of residual chlorides, which significantly affect the catalytic activity but only slightly alter the selectivity for the hydrogenation of the carbonyl bond.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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