Efficient production of biodiesel from both esterification and transesterification over supported SO42--MoO3-ZrO2-Nd2O3/SiO2 catalysts

被引:14
|
作者
Li, Xiuqin [1 ]
Tong, Dongmei [1 ]
Hu, Changwei [1 ]
机构
[1] Sichuan Univ, Coll Chem, Minist Educ, Key Lab Green Chem & Technol, Chengdu 610064, Peoples R China
关键词
Biodiesel; SMZN/SiO2 solid acids; Stable active centers; Small size ZrO2; SOLID SUPERACID CATALYST; PROMOTED SULFATED ZIRCONIA; ACID CATALYSTS; BUTANE ISOMERIZATION; SELECTIVE OXIDATION; CO METHANATION; PALM OIL; SILICA; METHANOL; ACETATE;
D O I
10.1016/j.jechem.2015.06.010
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
SO42--MoO3-ZrO2-Nd2O3/SiO2 (SMZN/SiO2) catalysts for the production of biodiesel via both esterification and transesterification were prepared and characterized by N-2 adsorption-desorption isotherms, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry analysis (TGA), ammonia adsorption Fourier transform infrared spectra (NH3-FTIR), and ammonia adsorption temperature programmed desorption (NH3-TPD) to reveal the dependence of the stable catalytic activity on calcination time. The reason for catalyst deactivation was also studied. The calcination time remarkably affected the types of active centers on SMZN/SiO2, and 4 h was found to be the optimal calcination time. SO42- species bonded with small size ZrO2 were found to be the stable active centers, where the leaching of SO42- and the deposition of coke were inhibited. The deposition of coke was easier on large size ZrO2 than on small size ones. Calcination in air flow could eliminate the deposited coke to recover the deactivated catalysts. (C) 2015 Science Press and Dalian Institute of Chemical Physics. All rights reserved.
引用
收藏
页码:463 / 471
页数:9
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