Attrition resistant catalyst for dimethyl ether synthesis in fluidized-bed reactor

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）.

使流体化床的反应堆是暗淡乙醇醚(DME ) 的一个候选人从 syngas 的合成因为它的优秀的热移动能力。改进催化剂的摩擦抵抗的无异状，文件夹被加到由甲醇合成部件 CuO/ZnO/Al 2 O 3 和甲醇脱水部件 HZSM-5，它被一起沉淀准备并且由水花弄干得到球形的粒子塑造了。在催化活动的硅石大音阶的第五音的效果在改正床流动被调查微反应堆。基于实验结果，在 0 ∼20wt% 的范围的硅石大音阶的第五音在催化活动有小效果。通常，当催化剂的摩擦抵抗与增加硅石大音阶的第五音增加了时， CO 变换和 DME 产量随硅石大音阶的第五音的集中的增加减少了，显示极大地改进摩擦抵抗 without 是可行的牺牲催化剂的活动。另外，催化剂的描述用 Brunauer-Emmett-Teller (赌注) 被执行， X 光检查粉末衍射(XRD ) 和温度规划了减小(TPR ) 。