HIDROGENASI CO2 MENJADI METANOL DENGAN MENGGUNAKAN KATALIS ZEOLIT ALAM, ZEOLIT SINTESA ZSM-5 DAN KATALIS SINTESA Cu/ZnO/Al2O3

Abstract

The effect of CO₂ to the environment can be reduced by converting the gas into valuable product. One of the alternative ways to make use of CO₂ is by hydrogenation into methanol by catalyst. Research on hydrogenation of CO₂ into methanol over natural zeolite, synthesized zeolite ZSM-5 and synthesized Cu/ZnO/Al₂O₃ catalysts had been done. The synthesized Cu/ZnO/Al₂O₃ catalyst was prepared by impregnation method, while the synthesized ZSM-5 was prepared by gel permeation method. Components of the catalyst were characterized by XRD method.  Catalyst activity was examined by reacting hydrogen, carbon dioxide and nitrogen with the ratio of 6 : 3 : 1. The research was conducted at temperature of 300-500^oC, with the reaction time of 2 h and the catalyst loading of 1 g with the variation of catalyst used, natural zeolite, synthesized ZSM-5 and synthesized Cu/ZnO/Al₂O₃. The results of catalyst characterization showed that almost all of the characteristic peaks of natural zeolite were alumina and silica and component of Cu/ZnO/Al₂O₃ were Cu, CuO, ZnO, and Al₂O₃. The crystallinity of ZSM-5 was low. Results of hydrogenation reaction showed that the highest CO₂ conversion, methanol selectivity and methanol yield were 92%, 68% and 65%, respectively, obtained from the reaction over natural zeolite at reaction temperature of 500^oC. Natural zeolite showed higher activity than synthesized ZSM-5 and Cu/ZnO/Al₂O₃.