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A comparative study of coprecipitated BaCO3/La2On(CO3)rn catalysts for the oxidative coupling of methane |
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| Authors: | Unni Olsbye Guy Desgrandchamps Klaus-Joachim Jens and Stein Kolboe |
| Affiliation: | a Elf Aquitaine, Groupement de Recherches de Lacq, B.P. 34, 64170 Artix, France b Center for Industrial Research, P.O.Box 124, Blindern, N-0314 Oslo, Norway Present adress: Statoil, N-3960 Stathelle, Norway), c University of Oslo, Dept. of Chemistry, P.O.Box 1033, Blindern, N-0315 Oslo, Norway |
| Abstract: | Coprecipitated catalyst systems containing BaCO3 and La2On(CO3)m (n≥1.5) with La/Ba = 0.05-10 were tested for catalytic activity, selectivity and stability in the oxidative coupling of methane reaction (OCM). Maximum C2+ selectivities of 78% and C2+ yields of 11% were obtained. The results show that La is the more active cation component of the system. The presence of BaCO3 in the system leads to decreasing crystal size of the La phases, and to higher C2+ selectivities at equal methane conversions. Life time tests showed that the Ba- La-containing catalysts were quite stable. Na impurities in the system lead to larger crystals in the La phases, and to less selective and less stable catalysts for the OCM reaction. Na is lost during reaction. |
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