Oxidative coupling of methane to higher hydrocarbons was investigated using a p-type semiconductor catalyst, Y2O3, doped with Sr2+ and Na+ cations at 1 atm pressure. The ratio of methane partial pressure to oxygen partial pressure was changed from 6 to 40 and temperature was kept constant at 1023 K in the experiments conducted in a co-feed mode. Both C-2+ selectivities and % CH4 conversion were substantially higher for the case of Sr/Y2O3 (1:10 mole ratio) catalyst as compared to the undoped Y2O3 catalyst at constant P-CH4/P-O2 ratios, For the case of Na-doped Y2O3 catalysts, C2H4 selectivity was observed to be nearly zero, Ethane selectivities increased in the order of Y2O3 < Sr/Y2O3 (1:10) < Na/Y2O3 (1:10) < Na/Y2O3 (1:1). SEM/EDX analyses of fresh catalysts also indicated incorporation of Sr2+ and Na+ cations into the lattice structure of Y2O3. Excess Sr was detected by XRD on the Sr/Y2O3 catalyst after experiment. For the fresh Na/Y2O3 (1:1) catalyst, excess Na2CO3 was clearly observed in SEM photographs; the enhancement in C2H6 selectivity seen in this catalyst could be ascribed to this excess Na2CO3.