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采用共沉淀法制备了一系列不同铜钴摩尔比(0,0.1,0.5,1.0,2.0)的Cu/Co/Mn/Al层状结构催化剂并考察了其在合成气制混合醇反应中的催化性能,采用N_2物理吸脱附、电感耦合等离子体原子发射光谱法(ICP-AES)、X射线衍射(XRD)、扫描电子显微镜(SEM)、氢气程序升温还原(H_2-TPR),热重分析(TG)和高分辨透射电子显微镜(HRTEM)等对催化剂进行了表征分析。结果表明,适当的铜钴摩尔比可以增大催化剂的比表面积,提高催化剂的还原性能,并能形成较规整的层状结构从而提供更均一分散的合成醇活性位,从而提高催化活性和醇选择性。当铜钴摩尔比为0.5时,得到最高的醇时空产率(STY)和醇质量选择性,分别为0.071 g?g~(-1)?h~(-1)和35.9%。
A series of Cu / Co / Mn / Al layered catalysts with different Cu and Co mole ratios (0,0.1,0.5,1.0,2.0) were prepared by coprecipitation method and their catalytic activities were investigated in a mixed alcohol reaction of syngas Performance was investigated by N 2 physisorption, ICP-AES, XRD, H_2-TPR, (TG) and high resolution transmission electron microscopy (HRTEM) were used to characterize the catalysts. The results show that the appropriate molar ratio of copper and cobalt can increase the specific surface area of the catalyst, increase the reduction performance of the catalyst and form a more regular layered structure to provide a more uniform dispersed active site of the alcohol, thereby improving the catalytic activity and alcohol selectivity Sex. When the molar ratio of copper to cobalt was 0.5, the highest STY and alcohol selectivity were obtained, which were 0.071 g? G? -1? H? And 35.9%, respectively.