OXIDATIVE COUPLING OF METHANE ON SUPERCONDUCTOR-TYPE CATALYTIC MATERIALS |
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Authors: | Ye im Erarslano lu I ik Oka Timur Do u John B. Butt |
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Affiliation: | a Department of Chemical Engineering, Middle East Technical University, Ankara, Turkeyb Department of Chemical Engineering, Northwestern University, Evanston, 1L, U.S.A |
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Abstract: | Oxidative coupling of methane to higher hydrocarbons was investigated using alkali and rare earth cuprates such as YBa2Cu3O7-x, La1.8Ba0.2CuO and La2CuO4. Oxygen and methane in helium were fed to the reactor in a cofeed mode. Approximately, 5 g of catalyst in powder form was placed in a quartz flow reactor in all experiments. Oxygen partial pressure was changed as a parameter (P0 = 0.5 to 9.1 kPa) while keeping methane partial pressure and temperature constant at 18kPa and 1023 K respectively. Investigation of catalytic activity in terms of overall methane conversion and C2 + (C2H4+C2H6) product selectivity indicated that higher conversions and lower selectivities were obtained as O2 partial pressure was increased at a constant methane partial pressure of 8kPa. In comparing the performance of the two catalysts, La1.8Ba0.2CuO and La2CuO4; the selectivity results indicated a positive influence of incorporation of Ba into La2CuO4 structure. Similarly, selectivity values substantially increased teaching 86.3% at a reaction temperature of 1023 K and at PCH4./PO3, = 6 when La was replaced by Y and Ba. |
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Keywords: | Methane oxidative coupling Superconductor-type catalysts Y-Ba-Cu-O La-Ba-Cu-O Lanthanum cuprate |
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