论文部分内容阅读
用共沉淀耦合机械混合法制备Cu-Zn-Al-Cr/ZSM-5双功能催化剂,与Cu-Zn-Al/ZSM-5催化剂进行对比研究,并考察其在二甲醚水蒸气重整制氢反应中的催化性能,研究ZSM-5在二甲醚水解反应以及铜基催化剂Cu-Zn-Al-Cr在甲醇水蒸气重整制氢反应中的活性,同时采用热重、X射线衍射、H2程序升温还原等手段对催化剂的焙烧温度、物相结构、还原性能等进行分析。结果表明,Cu-Zn-Al-Cr/ZSM-5双功能催化剂的性能明显优于Cu-Zn-Al/ZSM-5催化剂,同时Cu-Zn-Al-Cr/ZSM-5双功能催化剂在二甲醚水蒸气重整制氢反应中有较好的低温活性和CO选择性,当反应温度为280℃,水醚比为7∶1时,二甲醚转化完全,氢气收率达到85.7%,反应温度低于240℃时,无CO生成;同时催化剂之间的耦合作用使Cu-Zn-Al-Cr/ZSM-5催化剂在较高温度下具有较好的活性和稳定性。
Cu-Zn-Al-Cr / ZSM-5 bifunctional catalyst was prepared by coprecipitation-coupled mechanical mixing method and compared with Cu-Zn-Al / ZSM-5 catalyst. Hydrogen reaction of ZSM-5 in dimethyl ether hydrolysis reaction and copper-based catalyst Cu-Zn-Al-Cr in methanol steam reforming reaction of hydrogen production, using thermogravimetry, X-ray diffraction, H2 temperature reduction and other means of catalyst calcination temperature, phase structure, reduction performance analysis. The results show that Cu-Zn-Al-Cr / ZSM-5 bifunctional catalyst is superior to Cu-Zn-Al / ZSM-5 catalyst and Cu- When the reaction temperature is 280 ℃ and the ratio of water to ether is 7:1, the conversion of dimethyl ether is complete and the yield of hydrogen reaches 85.7% When the reaction temperature is lower than 240 ℃, no CO is formed. At the same time, the catalyst Cu-Zn-Al-Cr / ZSM-5 catalyst has better activity and stability at higher temperature.