Ni‐based catalysts present a highly interesting performance for the reductive amination of cyclohexanol (CHOL). The stability of a commercial Ni‐based catalyst was evaluated and a high stability over the tested time‐on‐stream (TOS) was observed. The reaction network was evaluated by analysis of selectivity profiles as a function of CHOL conversion. The formation of cyclohexylamine (CHA) was found to be consistent with the proposed borrowing hydrogen method (BHM). The formation of heavy‐end (HE) by‐products also follows the BHM pathway as parallel reaction. The effect of individual molar proportions of NH₃ and H₂ was evaluated. It was found that when H₂ is present in a high excess, side reactions were favored, but its presence is mandatory towards keeping the catalyst active.

中文翻译：

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镍基催化剂上环己醇的胺化反应-第二部分：催化剂的稳定性和反应途径

镍基催化剂在环己醇（CHOL）的还原胺化方面表现出非常令人感兴趣的性能。评估了商用镍基催化剂的稳定性，并观察到了经过测试的运行时间（TOS）的高稳定性。通过分析选择性曲线作为CHOL转化的函数来评估反应网络。发现环己胺（CHA）的形成与提议的借用氢法（BHM）一致。重质（HE）副产物的形成也遵循BHM途径，即平行反应。评价了NH ₃和H _2的摩尔比的影响。发现当H ₂ 如果存在大量过量的副反应，则有利于副反应，但是必须保持其存在以保持催化剂的活性。