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首页> 外文期刊>Catalysis science & technology >Significant effect of base on the improvement of selectivity in the hydrogenation of benzoic acid over NiZrB amorphous alloy supported on gamma-Al2O3
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Significant effect of base on the improvement of selectivity in the hydrogenation of benzoic acid over NiZrB amorphous alloy supported on gamma-Al2O3

机译：碱基对在γ-AL2O3支持的NIZRB无定形合金中苯甲酸氢化的选择性的显着影响

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摘要

This study presents a facile way to improve the selectivity for cyclohexanecarboxylic acid by adding a base in the hydrogenation of benzoic acid over a non-noble metal NiZrB amorphous alloy supported on gamma-Al2O3. It is found that alkali metal carbonates exhibit an excellent selectivity improvement from 50.3% to a range of 93.5-95.7%, with the conversion of benzoic acid higher than 92.3%. Even a very small amount of K2CO3 (1 mol% benzoic acid) was efficient for improving the selectivity for cyclohexanecarboxylic acid. In addition, a lower reaction temperature was beneficial to the improvement of selectivity. Based on the results of temperature programmed desorption of NH3 and inductively coupled plasma analysis, the improvement of selectivity in the presence of a base was attributed to the neutralization of the acidic sites on the surface of the catalyst by the in situ generated potassium benzoate, inhibiting the hydrodeoxygenation of carbonyl and resulting in a high selectivity for cyclohexanecarboxylic acid.
机译：这项研究提出了一种通过在gamma-al2O3支持的非差异金属NIZRB上添加苯甲酸氢化的基础，以提高环己烷二羧酸的选择性来提高环己甲二羧酸的选择性。发现碱金属碳酸盐的选择性从50.3％提高到93.5-95.7％的范围，苯甲酸的转化率高于92.3％。即使是少量的K2CO3（1 mol％苯甲酸）也有效地提高了环己烷羧酸的选择性。另外，较低的反应温度对提高选择性是有益的。基于温度编程的NH3和电感耦合等离子体分析的结果，在存在碱的存在下，选择性的提高归因于原位产生的苯甲酸钾，抑制了催化剂在催化剂表面的中和酸性位点的中和化。羰基的加氢氧合和对环己羧酸的高选择性。

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