A Ni/mSiO₂-AE nanocatalyst was successfully prepared via loading the active nickel species on mSiO₂ by an ammonia evaporation (AE) method. It exhibited excellent catalytic performance in the selective hydrogenation of benzoic acid with the conversion of benzoic acid and selectivity to cyclohexane carboxylic acid being 98.9% and 99.1%, respectively. Furthermore, the catalyst can be recycled four times without appreciable loss of its initial activity. As demonstrated by TEM, the active nickel species was highly dispersed with an average particle size of 3.2 nm in this nanocatalyst, which is much smaller than that of Ni/mSiO₂-IMP (∼18 nm), prepared by a conventional impregnation method. TPR and XPS results revealed the existence of a stronger interaction between the active nickel species and the mSiO₂ support in Ni/mSiO₂-AE, compared to Ni/mSiO₂-IMP. This strong metal–support interaction in Ni/mSiO₂-AE can effectively suppress the loss of the active nickel species during the reaction, resulting in its good stability under relatively harsh reaction conditions.

中文翻译：

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用于苯甲酸加氢的 高度分散且稳定的Ni / mSiO ₂ -AE纳米催化剂†

一种Ni / MSIO ₂ -AE纳米催化剂成功地制备通过加载上MSIO活性镍物种₂由氨蒸发（AE）方法。在苯甲酸的选择性加氢中，苯甲酸的转化率和对环己烷甲酸的选择性分别为98.9％和99.1％，它具有优异的催化性能。此外，该催化剂可以循环使用四次而不会明显损失其初始活性。如TEM所示，活性镍物质在该纳米催化剂中高度分散，平均粒径为3.2 nm，比Ni / mSiO ₂小得多。-IMP（〜18 nm），通过常规浸渍方法制备。TPR和XPS结果表明，与Ni / mSiO ₂ -IMP相比，Ni / mSiO ₂ -AE中活性镍物质与mSiO ₂载体之间存在更强的相互作用。Ni / mSiO ₂ -AE中这种强大的金属-载体相互作用可有效抑制反应过程中活性镍物质的流失，从而使其在相对苛刻的反应条件下具有良好的稳定性。