Nickel Oxide Catalysts for Partial Oxidation of Methane to Synthesis Gas
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 amon...
Main Authors: | , , , , |
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Format: | Article |
Language: | English |
Published: |
al-Farabi Kazakh National University
2016-01-01
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Series: | Eurasian Chemico-Technological Journal |
Subjects: | |
Online Access: | http://ect-journal.kz/index.php/ectj/article/view/194 |
Summary: | 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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ISSN: | 1562-3920 2522-4867 |