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分子筛硅铝比及晶粒粒径对cu-zno-al2o3/hzsm-5催化剂直接合成二甲醚反应性能的影响

, PP. 235-240

Keywords: hzsm-5分子筛,硅铝比,晶粒大小,二甲醚,双功能催化剂,甲醇脱水

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Abstract:

?采用水热晶化法合成了硅铝比(sio2/al2o3)为60、120、200和晶粒粒径分别为1.00和0.25μm的hzsm-5分子筛,并以其为甲醇脱水活性组分与铜基甲醇合成活性组分(cu-zno-al2o3)组成双功能催化剂(cu-zno-al2o3/hzsm-5),在连续流动加压固定床反应器上考察了cu-zno-al2o3/hzsm-5对合成气直接制二甲醚反应的催化性能。结果表明,随着分子筛硅铝比的提高,二氧化碳副产物的生成量逐渐减少,从而使目的产物二甲醚的选择性逐渐增大。与常规分子筛相比,小晶粒分子筛的反应活性接近,但二氧化碳和烃类副产物的选择性较低。

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