공업화학, 촉매/반응공학 : 이산화탄소로부터 올레핀 합성을 위한 혼성 촉매와 Fischer-Tropsch 합성 촉매의 비교 연구 = Industrial Chemistry, Catalysis/Reaction Engineering : Comparative Studies on Catalytic Conversion of CO2 into Olefin with Hybrid Catalysts and Fischer-Tropsch Synthesis Catalysts

다국어 초록 (Multilingual Abstract)

One-step conversions of CO_2 into olefins were investigated over conventional Fischer-Tropsch synthesis(FTS) catalyst and the new hybrid catalysts. The hybird catalyst was consisted of methanol synthesis catalyst(Cu/ZnO/Al_2O_3, Cu/ZnO/ZrO_3) and methanol to olefin(MTO) catalyst(Mg-La/ZSM-5). The activity of hybrid catalytic system, which was mixed with Cu/ZnO/Al_2O_3(6:3:1 in weight ratio) and Mg-La/ZSM-5, was superior than others in terms of CO_2 conversion and total hydrocarbon yield, but olefin was not produced significantly. The reason was supposed to be caused by Cu-support interaction, which gives rise to the loss of strong Bro¨nsted acid site and consequently the medium strength acid site production. In contrary to hybrid system, the modified F-T catalytic system showed similar enhanced CO_2 conversion. However, it showed high selectivity to olefin. When ZSM-5 was used as a support for FE-K catalyst system, the selectivity of olefin was found to be increased. The addition of potassium promoters give rise to increase amount of CO_2 uptake on the surface, and the improvement of stability in adsorbed Fe-C species. Consequently, by carefully selecting the support and additives on modified F-T catalyst system, it was possible to obtain the high CO_2 hydrogenation activity as well as high olefin selectivity.