Oxidative coupling of methane. The effect of strontium and sodium dopants on catalytic performance of Y2O3, a p-type semiconductor material

被引:8
作者
Erarslanoglu, Y [1 ]
Onal, I [1 ]
Dogu, T [1 ]
Senkan, S [1 ]
机构
[1] UNIV CALIF LOS ANGELES,DEPT CHEM ENGN,LOS ANGELES,CA 90095
关键词
methane; oxidative coupling; p-type semiconductor; yttria; Sr2+ and Na+ dopants; strontium dopants; sodium dopants;
D O I
10.1016/0926-860X(96)00036-1
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:75 / 84
页数:10
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