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Effect of Fe and Co promoters on CO methanation activity of nickel catalyst prepared by impregnation – co-precipitation method

  • Buyan-Ulzii Battulga , Tungalagtamir Bold and Enkhsaruul Byambajav EMAIL logo
Published/Copyright: July 20, 2020

Abstract

Ni based catalysts supported on γ-Al2O3 that was unpromoted (Ni/γAl2O3) or promoted (Ni–Fe/γAl2O3, Ni–Co/γAl2O3, and Ni–Fe–Co/γAl2O3) were prepared using by the impregnation – co-precipitation method. Their catalytic performances for CO methanation were studied at 3 atm with a weight hourly space velocity (WHSV) of 3000 ml/g/h of syngas with a molar ratio of H2/CO = 3 and in the temperature range between 130 and 350 °C. All promoters could improve nickel distribution, and decreased its particle sizes. It was found that the Ni–Co/γAl2O3 catalyst showed the highest catalytic performance for CO methanation in a low temperature range (<250 °C). The temperatures for the 20% CO conversion over Ni–Co/γAl2O3, Ni–Fe/γAl2O3, Ni–Fe–Co/γAl2O3 and Ni/γAl2O3 catalysts were 205, 253, 263 and 270 °C, respectively. The improved catalyst distribution by the addition of cobalt promoter caused the formation of β type nickel species which had an appropriate interacting strength with alumina support in the Ni–Co/γAl2O3. Though an addition of iron promoter improved catalyst distribution, the methane selectivity was lowered due to acceleration of both CO methanation and WGS reaction with the Ni–Fe/γAl2O3. Moreover, it was found that there was no synergetic effect from the binary Fe–Co promotors in the Ni–Fe–Co/γAl2O3 on catalytic activity for CO methanation.


Corresponding author: Enkhsaruul Byambajav, Department of Chemistry, School of Arts & Sciences, National University of Mongolia, Ulaanbaatar, 14201, Mongolia, E-mail

Funding source: The Program of Mongolia-Japan Engineering Education Development (MJEED)

Award Identifier / Grant number: P2019-3699

Funding source: The Advanced Research Fund of National University of Mongolia

Award Identifier / Grant number: P2017-2384

Acknowledgments

The authors acknowledge financial supports from the Advanced Research Fund of National University of Mongolia and the Program of Mongolia-Japan Engineering Education Development (MJEED), and sincerely appreciate the CRIEPI, Japan on the TPR and SEM experiments.

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was supported by the Advanced Research Fund of National University of Mongolia (P2017-2384) and the Program of Mongolia-Japan Engineering Education Development (MJEED) (P2019-3699).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2020-05-04
Accepted: 2020-06-13
Published Online: 2020-07-20

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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