Nickel Oxide Catalysts for Partial Oxidation of Methane to Synthesis Gas

K. Dossumov; H. Kurokawa; Y. G. Yergaziyeva; L. K. Myltykbayeva; S. Zh. Tayrabekova

doi:10.18321/ectj389

Authors

K. Dossumov Centre of Physical and Chemical Methods of Investigation, Tole-bi str., 96a, Almaty, 050012 Kazakhstan
H. Kurokawa Graduate School of Science & Engineering, Saitama University, 255, Shimo-okubo, Sakura-ku, Saitama, Japan
Y. G. Yergaziyeva The Institute of Combustion Problems, Bogenbay batyr str., 172, Almaty, 050012 Kazakhstan
L. K. Myltykbayeva The Institute of Combustion Problems, Bogenbay batyr str., 172, Almaty, 050012 Kazakhstan
S. Zh. Tayrabekova The Institute of Combustion Problems, Bogenbay batyr str., 172, Almaty, 050012 Kazakhstan

DOI:

https://doi.org/10.18321/ectj389

Keywords:

partial oxidation of methane, synthesis gas, supported nickel catalysts

Abstract

Nickel catalysts supported on different carriers (θ-Al₂O₃, γ-Al₂O₃, HZSM-5 with γ-Al₂O₃, HZSM-5, and NaX) have been investigated for the partial oxidation of methane. All the supported nickel catalysts showed a high activity for the formation of synthesis gas, and γ-Al₂O₃ was the most effective among all the tested carriers.
The effect of the heat-treatment temperature of the 3 wt.% Ni/γ-Al₂O₃ catalyst on its catalytic activity was studied, and a considerable decrease in its activity was observed by the heat-treatment of the catalyst at 1000 °C compared with the catalysts prepared by the 300–800 °C – calcination. The XRD analysis suggested the formation of NiAl₂O₄ that is a non-reducible compound at the high calcination temperature. The addition of a modifier (Co, Ce, or La) to the 3 wt.% Ni/γ-Al₂O₃ catalyst increased the selectivity to H₂ and CO with the decreasing selectivity to CO₂, and the highest selectivity to H₂ was obtained by the 5 wt.% NiLa/γ-Al₂O₃. The developed 5 wt.% NiLa/γ-Al₂O₃ catalyst showed a high stability for 30 h for the partial oxidation of methane at 750 °C. The methane conversion reached 95%, selectivity to hydrogen 83% and 52% to carbon monoxide.

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