期刊
CATALYSIS COMMUNICATIONS
卷 46, 期 -, 页码 179-182出版社
ELSEVIER
DOI: 10.1016/j.catcom.2013.12.020
关键词
Esterification; Acid solids; TiO2; SnO2; MoO3
资金
- FAPEAL
- CAPES
- CNPq
The impregnation of TiO2 or SnO2 with MoO3 forms solid materials exhibiting high acidity (MoO3/TiO2 and MoO3/SnO2) that might be applied as catalysts for the esterification of fatty acids. TiO2 and SnO2 oxide matrixes were prepared using a metal-chitosan complex method, and the acidity of these materials was modified via impregnation with MoO3. These catalytic systems were characterized by FTIR, N-2 adsorption/desorption isotherms, thermogravimetric analysis, and NH3 temperature programmed desorption (NH3-TPD) and tested in the esterification of fatty acids in the presence of methanol. The esterification reactions were carried out at three different temperatures (120 degrees C, 140 degrees C and 160 degrees C) with a 400:100 molar ratio of alcohol:fatty acid and 1% (mass) catalyst loading. Both TiO2 and SnO2 only exhibited catalytic activity after their acidity was improved via impregnation with MoO3, and yields of 80% and 90%, respectively, were achieved at 6 h and 160 degrees C. (C) 2013 Elsevier B.V. All rights reserved.
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