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l-serine-functionalized montmorillonite decorated with Au nanoparticles: A new highly efficient catalyst for the reduction of 4-nitrophenol
Journal of Catalysis ( IF 7.3 ) Pub Date : 2018-03-16 , DOI: 10.1016/j.jcat.2018.02.027
Mariana Rocha , Paula Costa , Carlos A.D. Sousa , Clara Pereira , José E. Rodríguez-Borges , Cristina Freire

The conversion of nitroarenes to aminoarenes is of great industrial interest since they are prevalent pollutants in water and aminoarenes are important intermediates in the synthesis of pharmaceuticals, natural products and in bulk chemical production. In this work, two new catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) were prepared by immobilization of gold nanoparticles onto the surface of K10 montmorillonite clay (K10) functionalized with two new l-serine derivative organosilanes. Transmission electron microscopy showed the presence of 4–5 nm gold nanoparticles after catalysis. The reduction reaction of 4-NP to 4-AP at 25 °C, using NaBH4 as reducing agent, led to nearly 100% conversion in only 1 minute, presenting pseudo-first-order rate constants normalized for Au loading of K = 630 and 430 mmol−1 s−1. The catalysts showed high stability, leading to substrate conversions of 95–100% after 10 consecutive cycles, with negligible Au leaching.



中文翻译:

Au纳米粒子修饰的l-丝氨酸功能化蒙脱土:新型高效还原4-硝基苯酚的催化剂

硝基芳烃向氨基芳烃的转化具有重要的工业意义,因为它们是水中的普遍污染物,而氨基芳烃是药物合成,天然产物和批量化学生产中的重要中间体。在这项工作中,通过将金纳米颗粒固定在用两种新的L功能化的K10蒙脱土(K10)的表面上,制备了两种用于将4-硝基苯酚(4-NP)还原为4-氨基苯酚(4-AP)的新型催化剂。-丝氨酸衍生物有机硅烷。透射电子显微镜显示催化后存在4-5 nm金纳米颗粒。使用NaBH 4在25°C下将4-NP还原为4-AP作为还原剂,它仅在1分钟内就导致近100%的转化率,呈现出针对K  = 630和430 mmol -1  s -1的Au负载归一化的伪一级反应速率常数。催化剂表现出很高的稳定性,连续10个循环后底物转化率为95-100%,金的浸出量可忽略不计。

更新日期:2018-03-16
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