Elsevier

Journal of Molecular Catalysis

Volume 78, Issue 3, 1 February 1993, Pages 339-350
Journal of Molecular Catalysis

Catalysis by the Rh/B system Part 1. Vapour-phase hydroformylation of ethylene at atmospheric pressure on Rh/B on silica

https://doi.org/10.1016/0304-5102(93)87063-EGet rights and content

Abstract

A Rh/B system with rhodium crytallites of small dimensions was formed by reducing rhodium trichloride supported on silica with NaBH4 atlow temperature. Thermal treatments in Ar and/or in CO/H2 strongly modify the surface composition but induce only a small modification in the crystallite diameter. After treatment in Ar at 543 K and in CO/H2 the Rh/B system catalyzes the vapor-phase hydroformylation of ethylene at atmospheric pressure in a flow reactor. The reaction proceeds with very good chemoselectivity toward the hydroformylation products (at 398 K, R is ⩾0.7). The formation of the catalytic species and the surface modifications were studied by X-Ray diffraction, FT—IR and XP spectroscopy. The presence of boron seems to play an important role both in preventing sintering of rhodium particles and in favouring good chemoselectivity toward the hydroformylation reaction.

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