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首页> 外文期刊>Catalysis science & technology >A highly dispersed and stable Ni/mSiO2-AE nanocatalyst for benzoic acid hydrogenation
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A highly dispersed and stable Ni/mSiO2-AE nanocatalyst for benzoic acid hydrogenation

机译：一个高度分散和稳定的镍/ mSiO2-AEnanocatalyst苯甲酸加氢

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摘要

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.
机译：Ni / mSiO2-AE nanocatalyst成功准备通过加载活性镍物种mSiO2氨蒸发(AE)方法。表现出优良的催化性能选择性加氢的苯甲酸转换的苯甲酸和选择性98.9%,环己烷羧酸99.1%,分别。可以回收没有明显的四倍失去最初的活动。TEM、活性镍物种高度分散的平均粒径为3.2 nm在这个nanocatalyst,远小于的镍/ mSiO2-IMP(~ 18海里),由一个传统浸渍法。结果显示更强的存在活性镍物种和之间的交互相比,在Ni / mSiO2-AE mSiO2支持Ni / mSiO2-IMP。在Ni / mSiO2-AE可以有效地进行交互抑制活性镍物种的丧失在反应期间,导致其良好稳定在相对恶劣的反应条件。

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