能源化学(英文) ›› 2015, Vol. 21 ›› Issue (4): 463-471.

• ARTICLES • 上一篇    下一篇

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

Xiuqin Li, Dongmei Tong, Changwei Hu   

  1. Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
  • 收稿日期:2015-01-22 修回日期:2015-05-25 发布日期:2015-08-21
  • 通讯作者: Dongmei Tong, Changwei Hu
  • 基金资助:

    This work is financially supported by the National Nature Science Foundation of China (no. 21106089). The characterization of catalysts from Analytical and Testing Center of Sichuan University is greatly appreciated.

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

Xiuqin Li, Dongmei Tong, Changwei Hu   

  1. Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
  • Received:2015-01-22 Revised:2015-05-25 Published:2015-08-21
  • Contact: Dongmei Tong, Changwei Hu
  • Supported by:

    This work is financially supported by the National Nature Science Foundation of China (no. 21106089). The characterization of catalysts from Analytical and Testing Center of Sichuan University is greatly appreciated.

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 N2 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.

关键词: Biodiesel, SMZN/SiO2 solid acids, Stable active centers, Small size ZrO2

Abstract: SO42--MoO3-ZrO2-Nd2O3/SiO2 (SMZN/SiO2) catalysts for the production of biodiesel via both esterification and transesterification were prepared and characterized by N2 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.

Key words: Biodiesel, SMZN/SiO2 solid acids, Stable active centers, Small size ZrO2