New rare earth oxide catalysts for the transesterification of triglycerides with methanol resulting in biodiesel and pure glycerol

被引:122
作者
Russbueldt, Bernhard M. E. [1 ]
Hoelderich, Wolfgang F. [1 ]
机构
[1] Univ Technol RWTH Aachen, Dept Chem Technol & Heterogeneous Catalysis, D-52074 Aachen, Germany
关键词
Biodiesel; Glycerol; Transesterification; Heterogeneous base catalysis; Rare earth oxides; ACID METHYL-ESTERS; SOYBEAN OIL; RAPESEED OIL; VEGETABLE-OIL; HETEROGENEOUS CATALYSTS; HYDROTALCITE CATALYSTS; FUEL PRODUCTION; BASE CATALYST; CALCIUM-OXIDE; BIO-DIESEL;
D O I
10.1016/j.jcat.2010.02.005
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The transesterification of different oils and fats with methanol in the presence of various rare earth oxide (REO) containing heterogeneous catalysts was investigated. Pure rare earth oxides, supported rare earth oxides, and stoichiometric rare earth mixed oxide catalysts were prepared. The catalysts were characterized by X-ray powder diffraction (XRD), nitrogen adsorption isotherm (BET), thermogravimetric analysis (TGA), and temperature-programmed desorption of CO2 (TPD). The correlation of the catalyst structure and activity in batch wise lab-scale autoclave experiments was studied. Among the pure rare earth oxides, an exceptionally high activity was found for lanthanum oxide. Rare earth oxides on oxidic carriers lead to the formation of surface mixed oxide phases, while activated carbon enables to enhance the dispersion of the lanthanum oxide phase. A series of rare earth aluminates, titanates, and zirconates were prepared by flash combustion synthesis and a comparison of the surface activity is given. (C) 2010 Elsevier Inc. All rights reserved.
引用
收藏
页码:290 / 304
页数:15
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