Selective hydrogenation of dimethyl adipate on titania-supported RuSn catalysts

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)The hydrogenation of dimethyl adipate over RuSn/TiO(2) catalysts was studied to examine the effect of tin species and titania on selective production of 1,6-hexanediol. The bimetallic catalysts were prepared by co-impregnation and the reaction was carried out in a liquid phase semi-batch reactor at moderate conditions (255 degrees C and 50 bar). The optimal Sn/Ru ratio to reach maximum selectivity changed according to the catalyst reduction temperature. A remarkable selectivity of 70% of 1,6-hexanediol was accomplished over the catalyst with Sn/Ru ratio of 2 and reduced at 400 degrees C. The characterization of the bimetallic catalysts reduced at such a high temperature was performed by Mossbauer spectroscopy and it was found that all systems presented a similar distribution of tin species and no entity revealed to be preferentially formed. The establishment of strong-metal-support interaction and thus a synergistic effect between TiO(x) moieties and Sn(n+) species was Suggested to determine the reaction pathway. (C) 2008 Elsevier B.V. All rights reserved.3531101106Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES