浆态床中CO2加氢直接合成二甲醚的双功能催化剂

采用共沉淀沉积法制备了CuO-ZnO-Al2O3-ZrO2/HZSM-5双功能催化剂，利用XRD、BET、H2-TPR、NH3-TPD等手段进行表征。在连续流动加压浆态床反应器中，以医用石蜡为惰性液相介质，研究了其对CO2加氢直接合成二甲醚的催化反应，考察了不同温度、不同压力、不同氢碳比和不同空速对反应结果的影响。研究表明，提高反应温度有利于提高CO2转化率，但使二甲醚的选择性降低；增大压力和氢碳比有利于提高CO2转化率和二甲醚的选择性；增大空速会使CO2转化率和二甲醚选择性均呈现下降趋势。

Hybrid catalysts for the direct synthesis of dimethyl ether from carbon dioxide hydrogenation in a slurry reactor

CuO-ZnO-Al2O3-ZrO2/HZSM-5 hybrid catalysts were prepared by a coprecipitation sedimentation method for the direct synthesis of dimethyl ether (DME) from CO2 hydrogenation. The prepared catalysts were characterized by XRD, BET, H2-TPR and NH3-TPD techniques. The hydrogenation process was carried out in a continuous flow pressurized slurry reactor using medical paraffin as a liquid medium under different temperature, pressure, H2/CO2 molar ratio and space gas velocity. The increase in reaction temperature is beneficial to improve the conversion of CO2, while the selectivity for DME is decreased. The increase in pressure and H2/CO2 molar ratio can improve both the conversion of CO2 and the selectivity for DME. While, the increase in the space velocity would decrease both the conversion of CO2 and the selectivity for DME.