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OXIDATIVE COUPLING OF METHANE OVER Na+-ZrO2-Cl-/Al2O3 CATALYSTS
Korean Journal of Chemical Engineering, January 1997, 14(1), 69-73(5), 10.1007/BF02706044
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Abstract
Oxidative coupling of methane （OCM） was carried out over Na+-ZrO2-Cl/Al2O3 catalysts in a temperature range from 1023 to 1123 K. The catalysts were prepared by impregnating the Ձ- or Ճ-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 Ճ-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 Ճ-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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Lee JS, Oyama ST, Catal. Rev.-Sci. Eng., 30, 249 (1988)
Park SE, Chang JS, Appl. Catal. A: Gen., 85, 117 (1992)
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