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Direct production of dimethyl ether from?synthesis?gas utilizing bifunctional?catalysts利用双功能催化剂 Abstract?In this study, direct synthesis of dimethyl?ether?from synthesis gas was investigated. For thispurpose,?H-mordenite zeolite was modified by wet impregnation?of?aluminum oxide onto it. The prepared catalysts?were?characterized by AAS, XRD and NH3-TPD?analyses.?Results of catalytic tests indicated that H-mordenite?mod-?ified with 8 wt% aluminum oxide was an appropriate?cat-?alyst for synthesis of dimethyl ether (DME) from?methanol?in which methanol conversion and DME selectivity??were 99.8 and 96.8%, respectively, without a noticeable?change?in catalyst stability. A series of bifunctional catalysts,?Cu–?ZnO–ZrO2/Al-modified H-mordenite, were prepared by?co-?precipitating sedimentation method and?characterized.?Synthesis of DME via direct CO hydrogenation was?then evaluated in a three-phase slurry reactor.?Experimental?results showed that Cu–ZnO–ZrO2/Al-modified?H-morde-?nite was a suitable catalyst for the production of?dimethyl?ether?from?synthesis?gas.?Ultimately,?the?effectsof?oper-?ating conditions such as temperature, pressure and?feed flow rate on the process performance of the?determined?optimum bifunctional catalyst have been?reported. 在这项具体的研究中,合成气直接合成二甲醚。,把浸湿改造过的氧化铝覆盖在H-mordenite沸石。原子吸收光谱法、x射线衍射和NH3-TPD分析。催化测试的结果明H-mordenite 8 wt %氧化铝是一个适当的合成二甲醚，甲醇,甲醇转化率和测距装置，选择性 分别为96.8%和99.8%,催化剂的稳定性没有明显变化。一系列的双功能催化剂、铜- ZnO-ZrO2 / Al-modified H-mordenite共同沉淀沉积方法和特点。通过直接合成测距装置加氢三相淤浆。实验结果表明,Cu-ZnO-ZrO2 / Al-modified H-morde——是一个合适的催化剂生产二甲醚的合成气体。最终操作条件的如温度、压力和饲料流量过程性能。 Environmental pollution and its prevention are?major?problems that human beings have been concerned with?for?the past several decades. One mai source of air?pollution?is?gases?leaving?theexhaust?of?automobiles,?in?particular?those from diesel engines. Dimethyl ether might be a?very?good replacement for diesel or LPG because it is a?clean?fuel (Arkharov et al.?2003). Dimethyl ether hasbeen?known?to?be?a?