Article ID Journal Published Year Pages File Type
60697 Journal of Catalysis 2015 13 Pages PDF
Abstract

•C2H4O2 was adsorbed mainly through acetate in bidentate and monodentate modes.•Pd0–Fe0, Pd0–Fe2Ox, Pd0–Nb2Ox and Pd0–La2Ox sites favored H2 production.•Pd0–Fe0 and Pd0–Fe2Ox sites were more active to acetic acid decomposition.•Pd/Fe2O3 favored the formation of highly ordered carbon.

Acetic acid decomposition for hydrogen production was investigated on Pd/SiO2, Pd/Nb2O5, Pd/La2O3 and Pd/Fe2O3 catalysts. The conversion of acetic acid started at 673 K and the products of the reaction were H2, CO, CH4, CO2, H2O and C2H4O. Pd/Fe2O3 was the most active catalyst for conversion of acetic acid and showed high hydrogen selectivity and good catalytic stability, followed by Pd/Nb2O5 and Pd/La2O3, whereas in the case of Pd/SiO2, there was not any H2 formation. The Pd/Fe2O3 catalysts presented reduced Pd–Fe and Pd0/Fe2Ox sites, producing complete conversion of acetic acid and a higher level of hydrogen selectivity (73%). Additionally, acetic acid adsorption on Pd/Fe2O3, Pd/Nb2O5 and Pd/La2O3 catalysts yielded the formation of acetate surface species. However, in the case of Pd/SiO2, there was molecular adsorption of acetic acid. During the reaction, there was formation of an ordered and disordered carbon mixture on Pd/La2O3, Pd/Nb2O5 and Pd/SiO2 catalysts, while carbon of a more ordered nature was produced on Pd/Fe2O3.

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Related Topics
Physical Sciences and Engineering Chemical Engineering Catalysis
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