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Drifts and TPD analyses of ethanol on Pt catalysts over Al 2 O 3 and ZrO 2 —partial oxidation of ethanol
Author(s) -
Schmal Martin,
Cesar Deborah V.,
Souza Mariana M. V. M.,
Guarido Carlos E.
Publication year - 2011
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20597
Subject(s) - catalysis , platinum , chemistry , decomposition , desorption , ethanol , selectivity , partial oxidation , inorganic chemistry , heterogeneous catalysis , adsorption , dehydration , water gas shift reaction , nuclear chemistry , organic chemistry , biochemistry
Ethanol adsorption on platinum catalysts supported on Al 2 O 3 and ZrO 2 was studied by temperature‐programmed desorption (TPD) and DRIFTS analysis. TPD of ethanol showed that the alumina support favoured the dehydration and decomposition ethanol, besides the water–gas shift reaction. DRIFTS analyses showed different intermediate species on the Pt/Al 2 O 3 and Pt/ZrO 2 catalysts. On the Pt/Al 2 O 3 catalyst it was observed formation and decomposition of acetate species. On the Pt/ZrO 2 were observed ethoxy species. Catalytic tests of the partial oxidation of ethanol showed that the H 2 selectivity was higher on the Pt/Al 2 O 3 compared to the Pt/ZrO 2 catalyst. Marked difference was observed for the H 2 /CO ratio, suggesting preferential WGSR for Pt/Al 2 O 3 and the reverse WGSR for the Pt/ZrO 2 catalyst. These results allowed proposing different reaction routes.