锰基催化剂上CO_2加氢反应性能的研究

STUDY ON PROPERTIES OF MnBASED CATALYSTS FOR CO 2 HYDROGENATION

研究了Ｍｎ基催化剂上ＣＯ２的加氢反应性能。结果表明：ＣＯ２活化吸附量的增加有利于ＣＯ２转化率的提高。Ｍｎ具有较好的ＣＯ２加氢生成ＣＯ的催化活性，ＣｕＯ、Ｆｅ２Ｏ３和ＺｎＯ的加入使催化剂活性得到进一步的提高；ＮｉＯ的加入增加了催化剂对Ｈ２的活化吸附量，从而使催化剂对ＣＨ４的选择性得到提高，同时使ＣＯ２的转化率与Ｎｉ／γＡｌ２Ｏ３相比略有下降。

TPR and CO 2/H 2TPD were employed to study CO 2 hydrogenation on Mnbased catalysts It was found that Mn had better properties on CO 2 catalytic hydrogenation to CO The addition of CuO, Fe 2O 3 and ZnO can improve the activity of catalysts, while the addition of NiO decreases the activity and increases the selectivity of CH 4 The activity evaluation and characterization of catalysts also suggested that CO 2 conversion was improved with the amount of CO 2 adsorbed As for H 2 activation adsorption, it was found that there were two conditions If the adsorbed H 2 was reacted as soon as the reaction started, CH 4 selectivity was increased with the amount of H 2 adsorbed, such as CuNi/γAl 2O 3 and MnNi/γAl 2O 3 catalysts, and if the adsorbed H 2 was not reacted as soon as the reaction started, the amount of H 2 adsorbed could not change the selectivity of CO 2 hydrogenation to CO, such as MnZn/γAl 2O 3 catalyst