Improvement of Cobalt Dispersion on Co/SBA-15 and Co/SBA-16 Catalysts by Ultrasound and Vacuum Treatments during Post-Impregnation Step

  • Jittraporn Kruatim Chulalongkorn University
  • Sasiradee Jantasee Rajamangala University of Technology Thanyaburi
  • Bunjerd Jongsomjit Chulalongkorn University

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Abstract

The Co/SBA-15 and the Co/SBA-16 catalysts having 20 wt% of cobalt were prepared by the conventional impregnation method. Then, the post-impregnation treatments including vacuum and ultrasound treatments were applied. The synthesized catalysts were characterized by means of N2 physisorption, small angle X-ray diffraction (SAXRD), wide angle X-ray diffraction (XRD), scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM/EDX), transmission electron microscopy (TEM), and temperature-programmed reduction (TPR). The results show that the synthesized SBA-15 had hexagonal structure and the synthesized SBA-16 had the cubic structure. The vacuum and the ultrasound treatments after incipient wetness impregnation can apparently enhance the dispersion of cobalt on the SBA-15 catalysts due to the decrease of the metal crystallite size. However, only the vacuum treatment was suitable for the Co/SBA-16. After reduction, no cobalt-silicate compound was detected based on XRD measurement. Both post-impregnation treatments can also decrease the metal-support interaction resulting in increased activity for CO2 hydrogenation under methanation.

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Author Biographies
Jittraporn Kruatim

Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Sasiradee Jantasee

Department of Chemical Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Pathum Thani 12110, Thailand

Bunjerd Jongsomjit

Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Published
Vol 21 No 1, Jan 31, 2017
How to Cite
J. Kruatim, S. Jantasee, and B. Jongsomjit, “Improvement of Cobalt Dispersion on Co/SBA-15 and Co/SBA-16 Catalysts by Ultrasound and Vacuum Treatments during Post-Impregnation Step”, Eng. J., vol. 21, no. 1, pp. 17-28, Jan. 2017.

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