KINETIC-STUDIES OF OXIDATIVE COUPLING OF METHANE ON SAMARIUM OXIDE

Kinetic behaviour of three samples of samarium oxide (cubic (Sm-1), mo noclinic (Sm-3) and mixed cubic-monoclinic (Sm 2)) were studied in the oxidative coupling of methane using a gradientless flow circulation s ystem. 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 CO2 was different for the samples studied. It is prop osed that formation of CO and CO2 occurs via different reaction routes . The rate of CO2 formation at high CH4/O-2 ratio is limited by oxidan t activation or surface CO2-complex decomposition.