Abstract
Kinetic behaviour of three samples of samarium oxide (cubic (Sm-1), monoclinic (Sm-3) and mixed cubic-monoclinic (Sm 2)) were studied in the oxidative coupling of methane using a gradientless flow circulation system. The specific rate of C 2-product formation differed by a factor of 6–8 for Sm-1 and Sm-3. The specific activity for CO formation did not depend upon the crystal structure of samarium oxide while the rate of formation of CO 2 was different for the samples studied. It is proposed that formation of CO and CO 2 occurs via different reaction routes. The rate of CO 2 formation at high CH 4/O 2 ratio is limited by oxidant activation or surface CO 2-complex decomposition.
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