氧气/甲烷比对Mo/Al_2O_3催化剂上甲烷二氧化碳重整反应的影响

Effect of O_2/CH_4 feed ratio oncarbon dioxide reforming of methane over Mo/Al_2O_3 catalyst

实验研究了进料CO_2/CH_4、O_2/CH_4比对Mo/Al_2O_3催化剂上甲烷二氧化碳重整反应的影响,并利用XRD、H_2-TPR等技术对催化剂和载体进行表征。结果表明,当n(CO_2)/n(CH_4)从1提高到1.5时,可以明显提高甲烷转化率和催化剂的稳定性。CO_2含量的降低会使甲烷的转化率降低,且在n(CO_2)/n(CH_4)比降低为0.125时会使催化剂的活性快速下降。当n(O_2)/n(CH_4)比为0.1时,会明显提高甲烷二氧化碳的转化率和H_2、CO的生成速率。但是当n(O_2)/n(CH_4)从0.4提高到0.6时,甲烷会与氧气发生部分氧化反应和完全氧化反应,从而抑制甲烷二氧化碳重整。

The effects of CO2/CH4 and O2/CH4 feed ratios on carbon dioxide reforming of methane over the Mo/Al2O3 catalyst were investigated experimentally. XRD and H2-TPR were used to characterize the catalysts and supports. The results show that the conversion of methane and the stability of the catalyst were improved obviously when the n（CO2）/n（CH4） increased from 1 to 1.5. The conversion of methane decreased with the decrease of CO2 content, and the activity of catalyst rapidly declined when the n（CO2）/ n （CH4） extremely decreased to 0.125. When n （O2）/n （CH4） was 0.1, a significant improvement on the conversions of methane and carbon dioxide and the generation rates of H2 and CO was found. When n（O2）/n（CH4） increased from 0.4 to 0.6, the competitive methane partial and complete oxidation reactions could be found that significantly inhibited the carbon dioxide reforming of methane.