Sa. Driscoll et Us. Ozkan, TRANSIENT ISOTROPIC LABELING USING (O2 O2)O-16-O-18 OVER ALKALI-METAL-PROMOTED MOLYBDATE CATALYSTS IN OXIDATIVE COUPLING OF METHANE/, Journal of physical chemistry, 97(44), 1993, pp. 11524-11529
The methane coupling reaction was investigated over MnMoO4 and alkali-
metal (Li, Na, K)-promoted MnMoO4 at 700-degrees-C using isotopically
labeled oxygen under both methane-free and oxygen/methane cofeed react
ion conditions. The addition of K to MnMoO4 has previously been found
to increase the selectivity to C2 hydrocarbons under methane coupling
conditions.1 Results of the isotopic labeling studies performed under
steady-state conditions indicated that the interaction of the catalyst
surfaces with gas-phase oxygen and the mobility of subsurface lattice
oxygen may play a significant role in determining the selectivity to
C2 hydrocarbons.