Hydrogenation of aromatic ketones with Pt- and Sn-modified Pt catalysts.

GERARDO F. SANTORI; ALBERTINA G. MOGLIONI; VIRGINIA VETERE; GRACIELA Y. MOLTRASIO IGLESIAS; MÓNICA L. CASELLA; OSMAR A. FERRETTI

APPLIED CATALYSIS A-GENERAL

Elsevier

Año: 2004 vol. 269 p. 215 - 223

0926-860X

The behavior of Pt/SiO2 and tin-modified Pt catalysts, PtSn-OM (organobimetallic catalyst) and PtSn-BM (bimetallic catalyst), in the hydrogenation of aromatic ketones: acetophenone, 3,4-dimethoxyacetophenone, benzophenone and chalcone, was studied. With PtSn-OM and PtSn-BM systems, results showed high selectivity, mostly exceeding 90%, towards the corresponding alcohols. In the case of acetophenone hydrogenation with PtSn-OM, selectivity to 1-phenyl-ethanol  is nearly 100% and both activity and selectivity are maintained after three reusing cycles. The electronic effect of ionic tin in the vicinity of platinum atoms is present in both systems; besides, the existence of SnBux fragments anchored to the metallic surface in PtSn-OM catalyst, favors the adsorption and activation of the C=O group of ketones, leading to high values of selectivity to the desired products. reusing cycles. The electronic effect of ionic tin in the vicinity of platinum atoms is present in both systems; besides, the existence of SnBux fragments anchored to the metallic surface in PtSn-OM catalyst, favors the adsorption and activation of the C=O group of ketones, leading to high values of selectivity to the desired products. hydrogenation of aromatic ketones: acetophenone, 3,4-dimethoxyacetophenone, benzophenone and chalcone, was studied. With PtSn-OM and PtSn-BM systems, results showed high selectivity, mostly exceeding 90%, towards the corresponding alcohols. In the case of acetophenone hydrogenation with PtSn-OM, selectivity to 1-phenyl-ethanol  is nearly 100% and both activity and selectivity are maintained after three reusing cycles. The electronic effect of ionic tin in the vicinity of platinum atoms is present in both systems; besides, the existence of SnBux fragments anchored to the metallic surface in PtSn-OM catalyst, favors the adsorption and activation of the C=O group of ketones, leading to high values of selectivity to the desired products. reusing cycles. The electronic effect of ionic tin in the vicinity of platinum atoms is present in both systems; besides, the existence of SnBux fragments anchored to the metallic surface in PtSn-OM catalyst, favors the adsorption and activation of the C=O group of ketones, leading to high values of selectivity to the desired products.The electronic effect of ionic tin in the vicinity of platinum atoms is present in both systems; besides, the existence of SnBux fragments anchored to the metallic surface in PtSn-OM catalyst, favors the adsorption and activation of the C=O group of ketones, leading to high values of selectivity to the desired products.