合成气直接制二甲醚双功能催化剂助剂的研究

合成气直接制二甲醚较间接法制取二甲醚有显著的经济效益和重要的理论意义，因而日益引起人们的重视［１］．其核心是研制兼有甲醇合成和脱水两种功能的催化剂，即在催化剂中同时含有这两种功能的活性组分．目前采用的催化剂体系多为铜锌氧化物和酸性脱水组分组成的复合催...

Study on the Promoters of Bifunctional Catalyst for Conversion of Synthesis Gas to Dimethyl Ether

Direct synthesis of dimethyl ether from synthesis gas was carried out over CuO ZnO Al 2O 3/HZSM 5 bifunctional catalysts containing various promoters (Mg, Mn, Zr, B) prepared by coprecipitating sedimentation method. These catalysts were investigated using XRD (X ray diffraction) and TPR (Temperature programmed reduction) techniques. The results show that addition of promoters affects the activities and properties of CuO ZnO Al 2O 3/HZSM 5 bifunctional catalysts, and Mg, Mn and Zr are favorable promoters for the conversion of syngas to dimethyl ether. In all catalyst systems, CuO, ZnO and HZSM 5 exhibit crystalline patterns with similar intensity, but Al 2O 3 and promoters could not be detected by XRD, which maybe exist in microcrystalline or amorphous state. Addition of the above promoters, except B, all causes the decrease of the reduction temperatures of CuO ZnO Al 2O 3/HZSM 5 bifunctional catalysts. Possible relationship between the activity and reduction temperature is discussed.