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Oxidative coupling of methane on Ce/Na/CaO catalysts

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Abstract

Oxidative coupling of methane was investigated on Na/CaO and Ce/Na/CaO catalysts with different sodium and cerium contents. The reaction was carried out in a micro fixed-bed flow reactor operating at atmospheric pressure, at 700 and 750°C and molar ratio feed of CH4 : O2 : N2 = 50 : 10 : 40. Catalysts were compared at isoconversion and were characterized by BET, XRD and XPS. The addition of cerium to Na/CaO catalyst increased the specific activity by a factor of eight. These catalytic and characterization results were related to the presence not only of Na+O- active sites, formed by the introduction of Na+ in the CaO lattice, but also to peroxide active sites. A mechanism is proposed to explain the role of cerium in increasing the rate of the regeneration step of the O –s and Na2O2 sites.

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Authors and Affiliations

  1. Programa de Engenharia Química, NUCAT/COPPE –, Caixa Postal 68502 –, CEP 21945-980, Rio de Janeiro, Brazil

    J.G.A. Pacheco Filho, Jean G. Eon & Martin Schmal

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  1. J.G.A. Pacheco Filho
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  2. Jean G. Eon
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  3. Martin Schmal
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Pacheco Filho, J., Eon, J.G. & Schmal, M. Oxidative coupling of methane on Ce/Na/CaO catalysts. Catalysis Letters 68, 197–202 (2000). https://doi.org/10.1023/A:1019064310606

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