Fluidized-bed reactor is a candidate for dimethyl ether （DME） synthesis from syngas because of its excellent heat removal capability. In order to improve the attrition resistance of catalyst, an amount of silica sol...Fluidized-bed reactor is a candidate for dimethyl ether （DME） synthesis from syngas because of its excellent heat removal capability. In order to improve the attrition resistance of catalyst, an amount of silica sol as binder was added to the catalyst composed of methanol synthesis component CuO/ZnO/Al2O3 and methanol dehydration component HZSM-5, which was prepared by coprecipitation and shaped by spray drying to get spherical particles. The effect of silica sol on the catalytic activity was investigated in a fixed-bed flow microreactor. Based on the experiment results, silica sol in the range of 0-20wt% had small effect on the catalytic activity. Generally, the CO conversion and DME yield decreased with the increase in concentration of silica sol, while the attrition resistance of catalysts increased with increasing silica sol, indicating that it was feasible to improve the attrition resistance without greatly sacrificing the activity of catalyst. In addition, the characterizations of catalysts were carried out using Brunauer-Emmett-Teller （BET）, X-ray powder diffraction （XRD） and temperature programmed reduction （TPR）.展开更多
放大制备SAPO-34分子筛催化剂,在实验室的流化床反应器中考察其对甲醇制低碳烯烃的催化性能。主要研究了反应温度、空速(WHSV)、进料组成随反应时间对产物中低碳烯烃(乙烯+丙烯)摩尔分率的影响;同时在流化床中,对失活催化剂进行再生实验...放大制备SAPO-34分子筛催化剂,在实验室的流化床反应器中考察其对甲醇制低碳烯烃的催化性能。主要研究了反应温度、空速(WHSV)、进料组成随反应时间对产物中低碳烯烃(乙烯+丙烯)摩尔分率的影响;同时在流化床中,对失活催化剂进行再生实验,考察了再生温度和再生时间的影响,并用XRD、SEM、N2等温吸附/脱附和NH3-TPD手段对催化剂进行表征。实验结果表明,在475℃,空速2.5 h 1,甲醇90%(mol)进料时,产物中低碳烯烃的摩尔分率高达90.3%;再生温度600℃,再生时间大于30 min条件下催化剂的再生效果较好,且微观结构和强弱酸中心的分布没有发生明显变化,可以循环使用。展开更多
文摘Fluidized-bed reactor is a candidate for dimethyl ether （DME） synthesis from syngas because of its excellent heat removal capability. In order to improve the attrition resistance of catalyst, an amount of silica sol as binder was added to the catalyst composed of methanol synthesis component CuO/ZnO/Al2O3 and methanol dehydration component HZSM-5, which was prepared by coprecipitation and shaped by spray drying to get spherical particles. The effect of silica sol on the catalytic activity was investigated in a fixed-bed flow microreactor. Based on the experiment results, silica sol in the range of 0-20wt% had small effect on the catalytic activity. Generally, the CO conversion and DME yield decreased with the increase in concentration of silica sol, while the attrition resistance of catalysts increased with increasing silica sol, indicating that it was feasible to improve the attrition resistance without greatly sacrificing the activity of catalyst. In addition, the characterizations of catalysts were carried out using Brunauer-Emmett-Teller （BET）, X-ray powder diffraction （XRD） and temperature programmed reduction （TPR）.
文摘放大制备SAPO-34分子筛催化剂,在实验室的流化床反应器中考察其对甲醇制低碳烯烃的催化性能。主要研究了反应温度、空速(WHSV)、进料组成随反应时间对产物中低碳烯烃(乙烯+丙烯)摩尔分率的影响;同时在流化床中,对失活催化剂进行再生实验,考察了再生温度和再生时间的影响,并用XRD、SEM、N2等温吸附/脱附和NH3-TPD手段对催化剂进行表征。实验结果表明,在475℃,空速2.5 h 1,甲醇90%(mol)进料时,产物中低碳烯烃的摩尔分率高达90.3%;再生温度600℃,再生时间大于30 min条件下催化剂的再生效果较好,且微观结构和强弱酸中心的分布没有发生明显变化,可以循环使用。
