Abstract
Hydrogenation of acetophenone, 2-butanone, styrene and 1-hexene over RhSn SiO 2 in heterogeneous liquid phase reaction systems was studied by in situ EXAFS, FT-IR, TEM, analytical TEM, CO and H 2 adsorption measurements. The catalytic activity of Rh SiO 2 for hydrogenation of acetophenone and 2-butanone increased by a factor of 5–500 by Sn addition, showing a maximum activity at surface composition Sn s Rh s = 1.5 , whereas hydrogenation of styrene and 1-hexene decreased monotonously and drastically by Sn addition. In situ Sn K-edge EXAFS of the well characterized CVD-RhSn SiO 2 catalyst prepared by using Sn(CH 3) 4 vapor suggested that oxygen of CO group makes a bond with Sn atom upon acetophenone adsorption.
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