Total oxidation pathways in oxidative coupling of methane over lanthanum oxide catalysts

Sylvie Lacombe-Lhoste , J. Sanchez , P. Delichere (1) , H. Mozzanega (1) , M. Tatibouet , C. Mirodatos (1)

1 IRC - Institut de recherches sur la catalyse

Lanthanum oxides calcined at low or high temperature are shown to present a surface composition corresponding to the phase La2O2(CO3) in the conditions of the oxidative coupling of methane. The C2 selectivity and productivity are improved on samples calcined at low temperature. At variance with the C2 formation, the total oxidation into CO2 would proceed mainly from surface reactions. The concentration and reactivity of the oxidation sites, determined from isotopic transient experiments, appear to depend on the procedure of catalyst preparation.

Domaines: Catalyse

Sylvie Lacombe-Lhoste, J. Sanchez, P. Delichere, H. Mozzanega, M. Tatibouet, et al.. Total oxidation pathways in oxidative coupling of methane over lanthanum oxide catalysts. Catalysis Today, 1992, 13, pp.273-282. ⟨10.1016/0920-5861(92)80151-C⟩. ⟨hal-00006265⟩