Towards understanding the bifunctional hydrodeoxygenation and aqueous phase reforming of glycerol

Glycerol is catalytically converted in aqueous phase over Pt/Al 2O 3 via bifunctional pathways involving dehydrogenation, dehydration and decarboxylation/decarbonylation. C C and C O bond hydrogenolysis does not occur. Kinetically coupled reactions of glycerol in water over bifunctional Pt/Al 2O 3 c...

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Veröffentlicht in:Journal of catalysis 2010-02, Vol.269 (2), p.411-420
Hauptverfasser: Wawrzetz, A., Peng, B., Hrabar, A., Jentys, A., Lemonidou, A.A., Lercher, J.A.
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Sprache:eng
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Zusammenfassung:Glycerol is catalytically converted in aqueous phase over Pt/Al 2O 3 via bifunctional pathways involving dehydrogenation, dehydration and decarboxylation/decarbonylation. C C and C O bond hydrogenolysis does not occur. Kinetically coupled reactions of glycerol in water over bifunctional Pt/Al 2O 3 catalysts are explored as a function of the Pt particle size and the reaction conditions. Detailed analysis of the reaction network shows that “reforming” and hydrodeoxygenation require the presence of a bifunctional catalyst, i.e., the presence of an acid–base and a metal function. The initial reaction steps are identified to be dehydrogenation and dehydration. The dehydrogenation of hydroxyl groups at primary carbon atoms is followed by decarbonylation and subsequent water gas shift or by disproportionation to the acid (and the alcohol) followed by decarboxylation. Hydrogenolysis of the C–O and C–C bonds in the alcohols does not occur under the present reaction conditions. Larger Pt particles favor hydrodeoxygenation over complete deconstruction to hydrogen and CO 2.
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2009.11.027