合成气一步法制二甲醚双功能催化剂的研究进展

Bifunctional Catalysts for Direct Synthesis of Dimethyl Ether from Syngas

概述了以合成气为原料一步法合成二甲醚双功能催化剂的研究现状及最新进展,分别介绍了双功能催化剂中的甲醇合成活性组分、甲醇脱水活性组分、两种活性组分的复合方法及配比等。锫和硼等是CuO-ZnO-Al2O3甲醇合成活性组分的良好助剂,硼、硅和钨可增强脱水组分γ-Al2O3的酸性,水蒸气处理和添加助剂可增加脱水组分HZSM-5的稳定性,共沉淀沉积法是制备双功能催化剂的较好方法。

Preparation method of bifunctional catalyst used for direct synthesis of dimethyl ether from syngas was sum-marized.The catalysts consist of methanol synthesis functional component and methanol dehydration functional component. Zirconium and boron are favorable additives to CuO -ZnO - Al2O3 -based bifunctional catalysts. Addition of boron, silicon and tungsten can enhance the acidity of γ-Al2O3. Steam treatment and addition of promoters can increase the stability of bifunctional catalysts when HZSM-5 is used as the methanol dehydration functional catalyst. Co-precipetation sedimentation is a good method for preparimg the bifunctional catalysts.