Preparation of CuO/ZnO/Al2O3 Catalyst for the Synthesis of Methanol

초록

CuO/ZnO/Al2O3 (CZA) catalyst has long been used in industrial methanol synthesis because of its high catalytic activity, long durability under low temperature and pressure[1,2]. In this work, the effect of calcination temperature, aging time and concentration of precipitant on the properties of CZA catalyst was studied for methanol synthesis by hydrogenation of carbon monoxide. CZA catalysts were prepared by co-precipitation method. Surface morphologies of synthesized catalysts were investigated by high-resolution scanning electron microscopy (HR-SEM), and porous structure of catalyst was examined by transmission electron microscopy (TEM). The specific surface area was measured by Brunauer–Emmett–Teller (BET) analysis with N2 sorption at 77 K, and crystallinity of synthesized materials were investigated by X-ray diffraction (XRD). Their catalytic activities for methanol synthesis from syn gas (H2:CO:CH4:CO2=45:48:4:3) were evaluated in a fixed bed reactor at 518 K and 45 bar. The CO conversion and the methanol yield were analyzed by using gas chromatography. Catalytic activity for methanol synthesis was found to be strongly dependent on morphology and surface properties.