期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 82, 期 1-2, 页码 120-130出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2008.01.010
关键词
transesterification; triglyceride; layered double hydroxide; lithium; aluminum
The catalytic properties of calcined Li-Al, Mg-Al and Mg-Fe layered double hydroxides (LDHs) were examined in two transesterification reactions, namely, the reaction of glyceryl tributyrate with methanol and the reaction of soybean oil with methanol. While the Li-All catalysts showed high activity in these reactions at the reflux temperature of methanol, the Mg-Fe and Mg-Al catalysts exhibited much lower methyl ester yields. CO2 TPD measurements revealed the presence of sites of weak, medium and strong basicity on both Mg-Al and Li-All catalysts, the latter showing higher concentrations of medium and strong base sites; by implication, these are the main sites active in transesterification catalyzed by calcined Li-Al LDHs. Maximum activity was observed for the Li-Al catalysts when a calcination temperature of 450-500 degrees C was applied, corresponding to decomposition of the layered double hydroxide to the mixed oxide without formation of crystalline lithium aluminate phases. (C) 2008 Elsevier B.V. All rights reserved.
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