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本文研究了合成甲醇的Cu-Zn-Al催化剂组成(Cu/Zn比、Al含量)对催化剂结构及催化性能的影响.固定Al含量为20.7%(mol),在保证母体结构为单一FC(Feitknecht Compounds)的前提下(即排除结构的影响),发现Cu/Zn=1.8时催化剂活性最高.认为催化剂的活性与Cu-ZnO在表面的最佳搭配有关.固定Cu/Zn=1.8,降低Al含量,催化剂母体由FC和M两相构成,FC晶胞参数有变化.通过活性评价,找到了一种性能较优的催化剂.对Al的作用进行了解释.并根据准晶态的特点,提出甲醇合成铜基催化剂的活性单元为Cu——Zn(其中□代表晶格氧的空位).
In this paper, the effects of Cu-Zn-Al catalyst composition (Cu / Zn ratio and Al content) on the structure and catalytic performance of the catalyst were investigated. The content of Al was 20.7 mol% It is found that the catalyst activity is the highest when Cu / Zn = 1.8, and it is considered that the activity of the catalyst is related to the best match of Cu-ZnO on the surface. , The catalyst precursor is composed of two phases, FC and M, and the parameters of the unit cell of the FC are changed. Through the activity evaluation, a better performance catalyst was found, the function of Al was explained, and according to the characteristics of quasicrystal, methanol The active unit of Cu-based catalyst is Cu - Zn (where □ stands for vacancy of lattice oxygen).