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采用固定床流动反应装置,考察了镍负载型催化剂上氧气对天然气和CO_2转化制合成气催化性能的影响,测定了催化剂的床层温度分布曲线.发现,随镍负载量增大,产物合成气摩尔百分含量迅速增大,当镍负载量达到一定值后,合成气含量保持不变.当原料气按化学计量比进料时,在800℃产物合成气的干基组成可以达到95%～96%(mol).氧气的加入对合成气含量影响较小,但可以在较宽范围(1.07～0.50)调节CO/H_2的比例.在800℃,CH_4:CO_2:O_2=35:35:17.5(ml/min)条件下,Ni-5催化剂连续使用280h,其活性和选择性几乎保持不变,说明催化剂具有良好的稳定性.在天然气和二氧化碳转化反应体系引入氧气,可以明显地缓和反应体系的强吸热效应,为降低能耗和增大反应器直径从而提高产量提供了可行性.
The effect of oxygen on the catalytic performance of natural gas and CO_2 conversion to syngas was investigated on a fixed bed flow reactor. The temperature distribution curve of the catalyst was measured. It was found that with the increase of the nickel loading, the product syngas The content of the syngas remains unchanged when the nickel loading reaches a certain value.When the feed gas is stoichiometrically fed, the dry basis composition of the syngas at 800 ° C can reach 95% 96% (mol) .The addition of oxygen has little effect on the content of syngas, but the proportion of CO / H 2 can be adjusted in a wide range of 1.07 ~ 0.50. At 800 ℃, CH 4: CO 2: O 2 = 35:35:17.5 (ml / min), the activity and selectivity of Ni-5 catalyst remained almost constant for 280h, indicating that the catalyst has good stability.Introducing oxygen into the natural gas and carbon dioxide conversion reaction system can obviously ease the reaction system Of the strong endothermic effect, to reduce energy consumption and increase the diameter of the reactor to increase the yield provided the feasibility.