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采用不同分子量的聚乙二醇(400、600、800和1 000)作为浆态床反应介质,工业甲醇合成催化剂C302作为催化剂进行一氧化碳加氢反应,运用XRD、H_2-TPR、NH_3-TPD-MS、BET、XPS等方法对催化剂进行表征,考察催化剂C302在不同浆态床反应介质中进行一氧化碳加氢反应后其结构及性能的变化.结果表明浆态床反应介质对催化剂性能的发挥具有显著的影响,以聚乙二醇作为浆态床反应介质,C302用于一氧化碳加氢反应时产物中均出现了乙醇,同时催化剂表现出良好的稳定性.其中以聚乙二醇600作为浆态床反应介质时,反应后催化剂C302中Cu晶粒尺寸降低,存在两种形态的Cu2O且两者数量匹配,同时其弱酸中心增多,表面Zn富集,这些为催化剂高选择性合成乙醇提供了适宜结构,活性评价显示乙醇选择性达到25.21%.
Polyethylene glycol (400, 600, 800 and 1000) with different molecular weights was used as the slurry bed reaction medium. The industrial methanol synthesis catalyst C302 was used as the catalyst for the hydrogenation of carbon monoxide. XRD, H 2 -TPR and NH 3 -TPD-MS , BET, XPS and other methods were used to characterize the structure and properties of catalyst C302 after hydrogenation of carbon monoxide in different slurry bed reaction media.The results show that the effect of slurry bed reaction medium on the performance of catalyst has significant , Using polyethylene glycol as the slurry bed reaction medium, ethanol was found in the product of C302 for carbon monoxide hydrogenation reaction, and the catalyst showed good stability. Among them, polyethylene glycol 600 was used as the slurry bed reaction When the catalyst is used as a catalyst, the Cu grain size in the catalyst C302 is decreased, two forms of Cu2O are present and the amounts of the two are matched, and the weak acid center is increased and the Zn is enriched on the surface. These catalysts provide a suitable structure for highly selective synthesis of ethanol, Activity evaluation showed ethanol selectivity reached 25.21%.