Combined catalytic partial oxidation and CO2 reforming of methane over supported cobalt catalysts |
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Authors: | E. Ruckenstein H.Y. Wang |
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Affiliation: | (1) Department of Chemical Engineering, State University of New York at Buffalo, Amherst, NY 14260, USA |
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Abstract: | The combined partial oxidation and CO2 reforming of methane to synthesis gas was investigated over the reduced Co/MgO, Co/CaO, and Co/SiO2 catalysts. Only Co/MgO has proved to be a highly efficient and stable catalyst. It provided about 94–95% yields to H2 and CO at the high space velocity of 105000 mlg–1h–1 and for feed ratios CH4/CO2/O2=4/2/1, without any deactivation for a period of study of 110 h. In contrast, the reduced Co/CaO and Co/SiO2 provided no activity for the formation of H2 and CO. The structure and reducibility of the calcined catalysts were examined using X-ray diffraction and temperature-programmed reduction, respectively. A solid solution of CoO and MgO, which was difficult to reduce, was identified in the 800°C calcined MgO-supported catalyst. The strong interactions induced by the formation of the solid solution are responsible for its superior activity in the combined reaction. The effects of reaction temperature, space velocity, and O2/CO2 ratio in the feed gases (while keeping the C/O ratio constant at 1/1) were investigated over the Co/MgO catalyst. The H2/CO ratio in the product of the combined reaction increased with increasing O2/CO2 ratio in the feed. |
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Keywords: | combined partial oxidation and CO2 reforming of methane synthesis gas Co catalyst |
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