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N2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(H2-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 catalysts derived from hydrotalcite precursors with different Cu/Co molar ratios (0,0.1,0.5,1.0,and 2.0) were prepared and used for the synthesis of higher alcohols from syngas.N2 physical adsorption desorption,inductively coupled plasma atomic emission spectrometry (ICP-AES),X-ray diffraction (XRD),scanning electron microscopy (SEM),hydrogen temperatureprogrammed reduction (H2-TPR),thermogravimetry (TG),and high-resolution transmission electron microscopy (HRTEM) techniques were employed to investigate the physical and chemical properties of the Cu/Co/Mn/Al catalysts.The results show that the optimum Cu content can increase specific surface area,improve reducibility,and form regular layered structure to provide more uniform distribution of active sites,thereby enhancing catalytic activity and alcohol selectivity.When the Cu/Co molar ratio was 0.5,the yield of alcohol and the alcohol selectivity reached the maximum values of 0.071 g·g-1·h-1 and 35.9％,respectively.
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