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对ＣＯ_２在Ｆｅ－Ｚｎ－Ｍ（Ｍ＝Ｚｒ，Ａｌ，Ｇａ和Ｃｒ）／ＨＹ复合催化剂上的加氢反应进行了研究。通过对复合催化剂的配比、反应温度以及气体空速的考察，确定了由ＣＯ_２加氢合成异丁烷的最佳反应条件。在对反应机理研究后发现，ＣＯ_２在复合催化剂上的加氢反应是一个混合了甲醇合成和甲醇制汽油（ＭＴＧ）的反应过程，而不是传统的ＦＴ反应过程。实验结果指出，反应中生成的烯烃是产生异丁烷的重要中间产物。在所有的催化剂上，异丁烷的组成在烃类中是最高的。在Ｈ２／ＣＯ２＝３，５ Ｍｐａ， ３０００ｈ~（－１）及３６０℃的反应条件下， ＣＯ_２在Ｆｅ－Ｚｎ－Ｚｒ／ＨＹ复合催化剂上进行加氢反应时，异丁烷在烃类中的选择性高达３８％，异丁烷的时空产率可达３．０ Ｃ－ｍｏｌ％，这是迄今为止我们所知由ＣＯ_２加氢合成异丁烷所得的最好结果。
Hydrogenation of CO_2 on Fe-Zn-M (M = Zr, Al, Ga and Cr) / HY composite catalysts was investigated. Through the investigation of compounding ratio, reaction temperature and gas space velocity of the composite catalyst, the optimal reaction conditions for the synthesis of isobutane from CO_2 were determined. After studying the reaction mechanism, it was found that the hydrogenation reaction of CO 2 on the composite catalyst is a reaction process combining methanol synthesis and methanol-based gasoline (MTG) instead of the traditional FT reaction process. The experimental results show that the olefins generated during the reaction are important intermediates for the production of isobutane. The isobutane composition is the highest among hydrocarbons for all catalysts. Under the reaction conditions of H2 / CO2 = 3,5 Mpa, 3000 h ~ (-1) and 360 ℃, when CO_2 was hydrogenated on the Fe-Zn-Zr / HY composite catalyst, Selectivity up to 38%, isobutane space-time yield of up to 3.0 C-mol%, which is so far we know from CO_2 hydrogenation of isobutane derived from the best results.