The present study focuses on the selective synthesis of primary amines from aliphatic alcohols and ammonia using alumina-ceria supported nickel formulations based on very low nickel loading (≤2 wt%) and without any additive or external H₂ supply. The effect of the catalyst preparation methods and modes of nickel impregnation were studied in detail and comprehensively characterized. The best formulation afforded 80% n-octanol conversion with 78% selectivity to n-octylamine at optimized reaction conditions, which were far better than control catalysts and benchmark Ni-alumina formulations relying on high Ni loadings. The enhanced activities of the alumina-ceria supported nickel catalysts was attributed to three combined effects: (1) a higher reducibility of surface nickel oxide species, (2) the genesis of very small and homogeneously distributed nickel nanoparticles (2–3 nm), and (3) a strong decline in the formation of nickel aluminates. Furthermore, unlike benchmark Ni catalysts, these formulations afforded a higher resistance to leaching.

本研究的重点是使用基于氧化铝负载的镍的镍配方，基于极低的镍负载量（≤2 wt％），从脂肪醇和氨中选择性合成伯胺，而无需任何添加剂或外部H ₂供给。详细研究了催化剂的制备方法和镍浸渍方式的影响，并进行了全面的表征。最佳配方可提供80％的正辛醇转化率，对n的选择性为78％-辛胺在最佳反应条件下的性能远远优于对照催化剂和依靠高Ni负载量的基准Ni-氧化铝配方。氧化铝-二氧化铈负载的镍催化剂的活性增强归因于三个综合作用：（1）表面氧化镍物种的还原性更高；（2）很小且均匀分布的镍纳米颗粒（2-3 nm）的产生； （3）铝酸镍的形成急剧下降。此外，与基准镍催化剂不同，这些配方具有更高的耐浸出性。