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采用以Al_2O_3陶瓷管为载体的LiNO_3/Sm_2O_3膜催化反应器进行CH_4氧化偶联反应。结果表明,氧扩散通过催化膜并成为活性氧物种,载体和催化膜控制了氧的扩散速率,使CH_4气流中保持很低的气相氧浓度,甚至没有气相氧存在,从而得到了很高的C_2烃选择性。在C_2烃收率为3.6%时,选择性可达100%。研究结果还表明,在进行的反应中,C_2H_6是初级产物,C_2H_6进一步氧化脱氢生成C_2H_4。研制的膜催化反应器具有好的稳定性。
CH_4 oxidative coupling reaction was carried out on LiNO_3 / Sm_2O_3 membrane catalytic reactor with Al_2O_3 ceramic tube as carrier. The results show that oxygen diffuses through the catalytic membrane and becomes a reactive oxygen species. The support and the catalytic membrane control the diffusion rate of oxygen and maintain a very low concentration of gaseous oxygen in the CH4 gas flow, even without the presence of vapor phase oxygen, resulting in a high C 2 Hydrocarbon selectivity. In the C_2 hydrocarbon yield of 3.6%, the selectivity of up to 100%. The results also show that during the reaction, C_2H_6 is the primary product and C_2H_6 is oxidatively dehydrogenated to C_2H_4. Developed membrane catalytic reactor has good stability.