Pt-Ge/C catalysts prepared by Controlled Surface Reaction and

I.M. VILELLA1, I. BORBATH2, F. SOMODI2, J.L. MARGITFALVI2, S.R. DE MIGUEL1, O.A. SCELZA

Malaga (España)

Simposio; XXI SICAT; 2008

The liquid-phase citral hydrogenation carried out over PtGe catalysts prepared by different techniques and supported on activated carbon powder purified and functionalized with HNO3 was investigated. In catalysts prepared by conventional successive impregnation (CI), Ge does not improve either the activity or the selectivity to unsaturated alcohols. However, PtGe catalysts prepared by Controlled Surface Reaction (CSR)show much better activities and selectivities to unsaturated alcohols (UA). It is needed a large concentration of Ge to polarize the –C=O group in the catalysts prepared by CI because Ge is located mainly over the support and the remanent is deposited over the Pt particles. In PtGe-CSR, Ge ions moieties polarize the C=O group since they would be placed near Pt nanoclusters, thus giving high selectivity to UA. Keywords: PtGe/C catalysts, catalyst preparation, citral hydrogenation, activated carbon support, catalyst characterizations.