期刊
CATALYSIS TODAY
卷 212, 期 -, 页码 120-126出版社
ELSEVIER
DOI: 10.1016/j.cattod.2012.09.011
关键词
Glycerol; Hydrogenolysis; 1,3-Propanediol; Heteropolyacids
Hydrogenolysis of glycerol to 1,3-propanediol was conducted over zirconia supported bifunctional catalysts containing Pt and heteropolyacids using H4SiW12O40 (HSiW), H3PW12O40 (HPW) and H3PMo12O40 (HPMo) as active compounds. Pt/ZrO2 was also examined for comparison. The as-prepared catalysts were characterized by BET, CO chemisorption, XRD, Raman spectra, NH3-TPD and FTIR of adsorbed pyridine. Compared with Pt/ZrO2, heteropolyacids modified Pt/ZrO2 catalysts showed higher acidity and better catalytic performance of glycerol hydrogenolysis to 1,3-propanediol. Among them, Pt-HSiW/ZrO2 exhibited superior performance due to the high Bronsted acid sites and good thermal stability. Independent of the heteropolyacid type, the concentration of Bronsted acid sites appeared as a key to the selective formation of 1,3-propanediol from glycerol hydrogenolysis, whereas the concentration of Lewis acid sites was related to the formation of 1,2-propanediol. We also investigated the reaction network and proposed a possible reaction pathway. (C) 2012 Elsevier B.V. All rights reserved.
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