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采用CO加氢反应、CO-TPD、TPSR和XPS等技术,考察了水、甲醇、乙醇和异丙醇等浸渍溶剂对Rh-Mn-Li/S iO2催化剂CO加氢性能的影响。结果表明,以乙醇为浸渍溶剂的催化剂表现出最高的C2含氧化合物时空收率(YC2-oxy)和C2含氧化合物选择性(SC2-oxy),分别达686.1 g/(kg-cat.h)和73.8%;以甲醇和异丙醇为浸渍溶剂的催化剂上YC2-oxy也较高,但是SC2-oxy都比前者低;水溶液浸渍制备的催化剂有着较高的SC2-oxy,但是其YC2-oxy较低。以醇类为浸渍溶剂的催化剂的高活性与金属活性组分在催化剂表面富集而导致的更多活性中心的形成有关。催化剂表面非解离的CO比率增加有利于C2含氧化合物选择性的提高。
The effect of impregnation solvents such as water, methanol, ethanol and isopropanol on the hydrogenation of CO over Rh-Mn-Li / S iO2 catalysts was investigated by CO hydrogenation, CO-TPD, TPSR and XPS. The results showed that the ethanol-impregnated catalysts showed the highest C2-oxy-C2-SC2-oxy yields of 686.1 g / (kg-cat. ) And 73.8%, respectively. The catalysts with methanol and isopropanol as impregnating solvent also had higher YC2-oxy but lower SC2-oxy than the former. The catalysts prepared by impregnation with aqueous solution had higher SC2-oxy but their YC2- oxy lower. The high activity of the catalyst with alcohol as the impregnating solvent is related to the formation of more active centers caused by the enrichment of the metal active component on the catalyst surface. The increase of the non-dissociated CO ratio on the catalyst surface favors the selective increase of C2 oxygenates.