Catalysis Letters

, Volume 8, Issue 5–6, pp 345–358

Homogeneous Rh-Sn alkoxide coatings on silica surfaces: A novel route for preparation of bimetallic Rh-Sn catalysts

  • S. L. Anderson
  • A. K. Datye
  • T. A. Wark
  • M. J. Hampden-Smith
Article

Abstract

The reaction of [{(COD)Rh}2Sn(OEt)6], where COD = 1,5-cyclooctadiene and Et = ethyl, with silanol groups on silica surfaces is shown to lead to near-monolayer coverage of the silica by the Rh-Sn organometallic compound. Heating the supported compound at 498 K yields a catalyst that is active for benzene hydrogenation at room temperature. When the catalyst is reduced in H2 at 823 K, the benzene hydrogenation activity increases with a simultaneous drop in the activity for n-butane hydrogenolysis. High temperature reduction leads to formation of Rh-Sn alloy particles with an average particle diameter of 2.5 nm. These particles are stable towards oxidation-reduction cycles involving oxidation at 773 K in 15% O2. When normalized to the benzene hydrogenation activity, the n-butane hydrogenolysis activity of the bimetallic catalyst is suppressed by over 3 orders of magnitude when compared to a monometallic Rh catalyst.

Keywords

Rh-Sn catalyst bimetallic catalysts Rh-Sn alkoxide coatings silica surfaces hydrogenation activity 

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Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1991

Authors and Affiliations

  • S. L. Anderson
    • 1
  • A. K. Datye
    • 1
  • T. A. Wark
    • 2
  • M. J. Hampden-Smith
    • 2
  1. 1.Center for Micro-Engineered Ceramics and Department of Chemical & Nuclear EngineeringUniversity of New MexicoAlbuquerqueUSA
  2. 2.Center for Micro-Engineered Ceramics and Department of ChemistryUniversity of New MexicoAlbuquerqueUSA
  3. 3.Department of Chemical & Nuclear Engg.Univ. of New MexicoAlbuquerqueUSA

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