Abstract
Kinetic studies on the oxidative coupling of methane over Sm 2O 3 have been carried out. The experimental rate equation observed could be well explained in terms of the reaction mechanism proposed. The reaction is initiated by abstracting hydrogen atom from the methane adsorbed by the diatomic oxygen on the surface. The coupling of two CH 3· radicals leads to C 2H 6. Deep oxidation of CH 3· produces CO and CO 2. The large activation energy (149 kJ mol −1) needed for the formation of CH 3· explains the sharp increase in the selectivity to C 2-compounds (C 2H 6 + C 2H 4) as raising temperatures. The oxygen species responsible for initiating the reaction was suggested to be O 2 2− or O 2 − on the surface.
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