Oxidative coupling of methane over Na+-ZrO2-C1-/Al2O3 catalysts |
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Authors: | Sun Ho Kim Sung Min Cho Ki June Yoon |
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Affiliation: | (1) Department of Chemical Engineering, Sung Kyun Kwan University, 440-746 Suwon, Korea |
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Abstract: | Oxidative coupling of methane (OCM) was carried out over Na+-ZrO2-Cl /A12O3 catalysts in a temperature range from 1023 to 1123 K. The catalysts were prepared by impregnating the α- or γ-Al2O3 supports with sodium carbonate and/or zirconyl chloride. The OCM activity was examined using the catalysts prepared by three
different preparation procedures. The best catalyst was the one prepared by subsequent impregnation of sodium carbonate-preimpregnated
γ-Al2O3 with a mixed solution of sodium carbonate and zirconyl chloride. It was found that preimpregnated sodium played an important
role in reducing the combustion activity of the γ-Al2O3. The catalyst with an optimal composition showed the highest C2 selectivity and yield of 40.8% and 15.1%, respectively. From the X-ray diffraction analysis it was found that tetragonal
ZrO2 was formed and that NaCl existed in the catalysts with relatively high sodium contents. |
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Keywords: | Alumina-Supported Methane Oxidative Coupling Sodium Chloride Zirconia |
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