In this study, a series of Co-based catalysts with alkali metal carbonate promoters were prepared to investigate the interrelation between promotion effect of these carbonates and catalytic performance for aniline hydrogenation to cyclohexylamine in vapour phase. The chemical promoters Li2CO3 and Na2CO3 leading to decrease in catalytic activity of cobalt catalysts for aniline hydrogenation. Catalysts with K2CO3 and Cs2CO3 loadings have practically no catalytic activity for hydrogenation of aniline. Results of TPD of aniline proved that presence of alkali metals carbonates restricts the adsorption of aniline on the surface of cobalt catalysts. Further, it was found that the addition of Na2CO3 greatly enhances the catalytic selectivity towards the cyclohexylamine and inhibits the consecutive reactions of cyclohexylamine leading to formation of by-products such as dicyclohexylamine and N-phenylcyclohexylamine.

中文翻译：

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碱金属助剂对钴基催化剂苯胺选择加氢制环己胺催化性能的影响

在这项研究中，制备了一系列含有碱金属碳酸盐促进剂的钴基催化剂，以研究这些碳酸盐的促进作用与苯胺气相加氢制环己胺的催化性能之间的相互关系。化学促进剂李2个一氧化碳3个和Na2CO3个导致钴催化剂对苯胺加氢的催化活性降低。含 K 的催化剂2个一氧化碳3个和Cs2CO3个负载量对苯胺加氢几乎没有催化活性。苯胺的TPD结果证明碱金属碳酸盐的存在限制了苯胺在钴催化剂表面的吸附。此外，还发现加入 Na2个一氧化碳3个大大提高了对环己胺的催化选择性，并抑制了环己胺的连续反应，导致形成副产物，如二环己胺和否-苯基环己胺。