The catalytic hydrodeoxygenation of C-3 alcohols (1- and 2-propanol, 1,2- and 1,3-propanediol, and glycerol) on Pt/Al2O3 has been mechanistically explored in the aqueous phase. Dehydrogenation on Pt and dehydration on alumina are the main elementary reaction pathways. In water, carbon-carbon bond cleavage for alcohols with terminal hydroxyl groups occurs via decarbonylation of aldehydes (generated by dehydrogenation of alcohols) and decarboxylation of acids, the latter being formed by disproportionation from aldehydes. The presence of water as solvent suppresses the dehydration for mono-alcohols mainly via blocking of Lewis acid sites by water. Dehydration is still the dominating primary reaction for 1,3-propanediol and glycerol, as the higher number of hydroxyl groups weakens the C-O bond strength. The overall reactivity of C-3 alcohols decreases in the order of 1,3-propanediol approximate to glycerol > 1,2-propanediol approximate to 1-propanol. (C) 2011 Published by Elsevier B.V.     «

The catalytic hydrodeoxygenation of C-3 alcohols (1- and 2-propanol, 1,2- and 1,3-propanediol, and glycerol) on Pt/Al2O3 has been mechanistically explored in the aqueous phase. Dehydrogenation on Pt and dehydration on alumina are the main elementary reaction pathways. In water, carbon-carbon bond cleavage for alcohols with terminal hydroxyl groups occurs via decarbonylation of aldehydes (generated by dehydrogenation of alcohols) and decarboxylation of acids, the latter being formed by disproport...     »

ISI Document Delivery No.: 903OE Times Cited: 9 Cited Reference Count: 35 Peng, Baoxiang Zhao, Chen Mejia-Centeno, Isidro Fuentes, Gustavo A. Jentys, Andreas Lercher, Johannes A. Jentys, Andreas/D-4622-2009; Kang, Zhai/G-8010-2012 Jentys, Andreas/0000-0001-5877-5042; European Union [NMP2-CT-2005-515792-2]; Technische Universitat Munchen in the framework of the European Graduate School for Sustainable Energy; CONACYT (Mexico); Alexander von Humboldt Stiftung (Germany); Alexander von Humboldt Stiftung This work was partly supported by the European Union in the framework of the Integrated Project TOPCOMBI (NMP2-CT-2005-515792-2). C.Z. acknowledges support from the Technische Universitat Munchen in the framework of the European Graduate School for Sustainable Energy. GAF acknowledges CONACYT (Mexico) and the Alexander von Humboldt Stiftung (Germany) for support and Prof. Dr. J.A. Lercher for the hospitality during a sabbatical stay in Munich. IMC acknowledges the Alexander von Humboldt Stiftung for a Study Fellowship for Junior Scientists. 9 Elsevier science bv Amsterdam     «

ISI Document Delivery No.: 903OE Times Cited: 9 Cited Reference Count: 35 Peng, Baoxiang Zhao, Chen Mejia-Centeno, Isidro Fuentes, Gustavo A. Jentys, Andreas Lercher, Johannes A. Jentys, Andreas/D-4622-2009; Kang, Zhai/G-8010-2012 Jentys, Andreas/0000-0001-5877-5042; European Union [NMP2-CT-2005-515792-2]; Technische Universitat Munchen in the framework of the European Graduate School for Sustainable Energy; CONACYT (Mexico); Alexander von Humboldt Stiftung (Germany); Alexander von Humbold...     »