Selective hydrogenation of dimethyl terephthalate over a potassium-modified Ni/SiO2 catalyst,RSC Advances

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Selective hydrogenation of dimethyl terephthalate over a potassium-modified Ni/SiO2 catalyst
RSC Advances ( IF 3.9 ) Pub Date : 2023-05-31 , DOI: 10.1039/d3ra02223d
Han Xiao ₁ , Chao Zhang ₁ , Jiaojiao Zhao ₂ , Zhaohui Zheng ₃ , Yuehui Li ₂

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Selective hydrogenation of dimethyl terephthalate (DMT) is an ideal way to prepare 1,4-cyclohexane dicarboxylate (DMCD), an important intermediate and monomer. Even though noble metal-based catalysts (e.g., Ru, Pd) have been developed for selective hydrogenation of DMT, the use of non-precious Ni catalysts to achieve high activity and selectivity is still challenging. In this study, we present that only 0.5 wt% of KF by post-impregnated doping can significantly improve the performance of Ni/SiO₂ catalysts (83% vs. 96% selectivity; 41% vs. 95% conversion). The selectivity of DMCD can be up to 97%, which is the highest reported over Ni catalysts. The boosting effect of KF modification might be due to higher amounts of Ni(0) species and lower amounts of moderate acidic sites, which are beneficial for selective hydrogenation of phenyl rings over hydrogenolysis of ester groups.

中文翻译：

钾改性 Ni/SiO2 催化剂选择性加氢对苯二甲酸二甲酯

对苯二甲酸二甲酯 (DMT) 的选择性加氢是制备重要中间体和单体 1,4-环己烷二甲酸酯 (DMCD) 的理想方法。尽管已经开发出用于 DMT 选择性加氢的贵金属基催化剂（例如Ru、Pd），但使用非贵金属 Ni 催化剂来实现高活性和选择性仍然具有挑战性。在这项研究中，我们提出通过后浸渍掺杂仅 0.5 wt% 的 KF 可以显着提高 Ni/SiO ₂催化剂的性能（选择性 83% vs. 96%；选择性 41% vs.95% 的转化率）。DMCD 的选择性可高达 97%，这是报道的超过 Ni 催化剂的最高选择性。KF 改性的促进作用可能是由于较高数量的 Ni(0) 物种和较低数量的中等酸性位点，这有利于苯环的选择性氢化而不是酯基的氢解。

更新日期：2023-05-31

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