Zirconia Modification on Nanocrystalline Titania-Supported Cobalt Catalysts for Methanation

  • Kitima PinKaew Chulalongkorn University
  • Okorn Mekasuwandumrong Silpakorn University
  • Joongjai Panpranot Chulalongkorn University
  • Artiwan Shotipruk Chulalongkorn University
  • Piyasan Praserthdam Chulalongkorn University
  • James G. Goodwin, Jr. Clemson University
  • Bunjerd Jongsomjit Chulalongkorn University
Keywords: Nanocrystalline TiO2, sol-gel, cobalt catalyst, methanation, CO hydrogenation.

Abstract

In this present study, the zirconia-modified different crystallite sizes of TiO2 (11, 13 and 16 nm) as support for the cobalt catalysts were investigated. The different TiO2 crystallites derived from the sol-gel method was obtained by varying the water:alkoxide molar ratio from 165 to 4 to gain the different nanocrystallite sizes of TiO2. Then, the TiO2 supports were used to yield various Co/TiO2 catalysts. It was found that the sizes of cobalt oxides species dispersed on TiO2 were corresponding to TiO2 sizes. Based on XPS study, the binding energy of Co 2p3/2 was not affected by the size of TiO2. The catalytic activity was measured via CO hydrogenation under methanation condition. In case of unmodified TiO2 support, the smaller TiO2 crystallites (Co/TiO2_11 nm) exhibited higher activity than other larger ones. Moreover, the zirconia modification also resulted in increased in activity for all samples. For both cases, it can be attributed to increased cobalt dispersion with small crystallite size of TiO2 support coupled with the zirconia modification as measured by CO chemisorption.

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Author Biographies

Kitima PinKaew

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

Okorn Mekasuwandumrong

Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom 73000, Thailand

Joongjai Panpranot

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

Artiwan Shotipruk

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

Piyasan Praserthdam

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

James G. Goodwin, Jr.

Department of Chemical Engineering, Clemson University, Clemson, South Carolina 29634, USA

Bunjerd Jongsomjit

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

Published In
Vol 16 No 4, Apr 22, 2012
How to Cite
[1]
K. PinKaew, “Zirconia Modification on Nanocrystalline Titania-Supported Cobalt Catalysts for Methanation”, Eng. J., vol. 16, no. 4, pp. 29-38, Apr. 2012.

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