在 M/MgO 催化剂上甲烷部分氧化制合成气

Partial Oxidation of Methane to Syngas over MgO Supported Catalysts

比较了以ＭｇＯ为载体的四种负载型催化剂在甲烷部分氧化反应中的催化活性，表明Ｒｈ具有最高活性。用Ｄ２（氘）－ＣＨ４同位素交换反应揭示，金属组份解离甲烷的能力与其催化活性紧密相关，在甲烷部分氧化反应中具有高活性的催化剂解离吸附甲烷分子的能力强，且以形成ＣＤ４为主的氘代甲烷产物分布，其次序为：Ｒｈ＞Ｒｕ＞Ｐｔ＞Ｐｄ。揭示了ＣＯ选择性随反应气流量增大、反应接触时间的缩短而提高，表示ＣＯ可能是甲烷部分氧化反应中的初始产物。还探讨了双金属组份催化剂的催化行为。

Comparison between activities of four catalysts containing respectively identical loadings(0 5%) of Rh,Ru,Pt and Pd supported on magnesium oxide (MgO)for the partial oxidation of methane to syngas was studied Rhodium appeared to be the most active metal An exchange reaction between methane and deuterium was employed to measure the catalyst dissociative activation ability of methane The results reveal that catalysts showing high reactivity activate methane strongly to give CD 4 as the major product in the deutero methane distribution In both methane partial oxidation reaction and D 2 CH 4 exchange reaction the order of catalytic activity is Rh>Ru>Pt>Pd Studies on the effect of variation in space velocity of feed gases on carbon monoxide selectivity indicate that CO selectivity increases with increasing space velocity of feed gases which infers that CO possibly is the initial product in the reaction It is found that a type of MgO supported bimetallic catalyst (0 2%Rh 0 4%Ru/MgO)demonstrates novel catalytic behaviour