燃料化学学报2016，Vol.44Issue(4)：437-448,12.
CaO对Cu-ZnO-ZrO2催化CO2加H2合成甲醇性能影响
Effect of CaO on the performance of Cu-ZnO-ZrO2 catalyst for methanol synthesis from CO2 and H2
摘要
Abstract
CuO:ZnO:ZrO2=5:4:1 ( molar ratio) catalysts were prepared with CaO doping of 0,1%, 2%, 4%, 8%, 16% ( molar fraction) by cocurrent-flow co-precipitation. X-ray diffraction ( XRD) , thermal analysis ( TG-DTG) , Fourier infrared ( FT-IR ) , N2 adsorption desorption ( BET ) , X-ray photoelectron spectroscopy ( XPS ) , hydrogen temperature programmed reduction ( H2-TPR ) , CO2 temperature programmed desorption ( CO2-TPD) and NH3 temperature programmed desorption ( NH3-TPD) were used to characterize the catalysts. The catalyst activity was evaluated with a lab-made fixed bed reactor. Results show that CaO doping enhances Lewis acid and surface alkaline of the catalyst, increases the amount of high temperature carbonate in the catalysts, improves the thermal stability, reduces the CuO particle size, enhances the synergistic effect of Cu-Zn, increases the Cu specific surface area and the Cu dispersion. The catalyst activity is influenced by the surface acidity, the specific surface area of copper, the synergistic effect of Cu-Zn and the dispersion of copper. When the doping amount of CaO is 2%, the copper specific surface area is 79. 3 m2/g, the dispersion degree of copper is 34. 8%, the CO2 conversion is 19. 01%, the selectivity of methanol is 24. 55% and the yield of methanol is 0. 044 g/(gcat·h), catalyst activity is the highest. With the amount of CaO increasing, the excessive CaO occupies the catalyst pore and covers the surface active sites, the Lewis acid and the surface alkaline of the catalysts become so strong that the effective contact of CuO and H2 is reduced, CO2 is difficult to desorb, resulting in decrease of catalytic activity. Therefore, the proper doping amount of CaO (2%) can promote the synthesis of methanol through CO2 hydrogenation.关键词
并流共沉淀法/CaO/Cu-ZnO-ZrO2/CO2 加H2/甲醇Key words
cocurrent-flow co-precipitation/CaO/Cu-ZnO-ZrO2/CO2 and H2/methanol分类
化学化工引用本文复制引用
陈俊军,高文桂,王华,纳薇..CaO对Cu-ZnO-ZrO2催化CO2加H2合成甲醇性能影响[J].燃料化学学报,2016,44(4):437-448,12.基金项目
The project was supported by the National Natural Science Foundation of China (51304099), the Natural Science Foundation of Yunan Province (2013FZ035) and the National Key Technologies R &D Program of China (2011BAC01B03).@@@@国家自然科学基金(51304099)、云南省应用基础研究计划(2013FZ035)和国家科技支撑计划(2011BAC01B03)项目资助 （51304099）
