Reactivity of surface species formed in the ethanol water reaction on supported Pt catalysts

FUEL 94

Krisztina Fodor, fodork@chem.u-szeged.hu1, János Raskó, rasko@chem.u-szeged.hu2, Márta Dömök, domok@chem.u-szeged.hu1, Tamara Kecskés1, and András Erdőhelyi, erdohely@chem.u-szeged.hu1. (1) Institute of Solid State and Radiochemistry, University of Szeged, Aradi vértanúk tere 1, Szeged, H-6720, Hungary, (2) Reaction Kinetics Research Group, Hungarian Academy of Sciences at the University of Szeged, Dóm tér 7, Szeged, H-6720, Hungary
The growing interests in H2 production from ethanol-water mixture which can be easily produced from renewable biomass induces the study of the reactivity of surface species formed during this catalytic reaction. It was found that on supported Pt catalysts not only adsorbed ethanol and different types of ethoxide species but also traces of acetaldehyde and a significant amount of acetate groups were detectable on the surface. It was assumed that the ethanol + water reaction was hindered by the surface acetate groups located mainly on the support. In the present paper we examine the decomposition and the reactivity of the species formed on Pt supported on different oxides and on potassium doped Pt/Al2O3 with water, hydrogen and oxygen. It was found that acetate species were stable even at 650 K on Pt/Al2O3 in the presence of the reactants but potassium additives lowers the decomposition temperature of surface acetate.
 

Advances in Hydrogen Production
1:30 PM-5:05 PM, Monday, 11 September 2006 Palace -- Marina Room, Oral

Division of Fuel Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006