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Organic-inorganic hybrid catalysts containing new Schiff base for environment friendly cyclohexane oxidation

机译：含有新型席夫碱的有机-无机杂化催化剂，可进行环己烷环氧化

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摘要

Organic and inorganic entities have been hybridized using 3-aminopropyltriethoxysilane (APTES) linker for the synthesis of three novel organic-inorganic hybrid catalysts [Cu(II), Co(II) and Ni(II)]. During the course of the synthesis, the static inorganic moiety was functionalized with versatile imine (C=N) groups. The prepared catalysts were characterized by spectral techniques (EDS, FT-IR, DR UV-Vis., Si-29 CP/MAS NMR, powder-XRD and ESR), thermal study (TG-DTG) and surface studies (SEM and AFM). The reported catalysts are significant because of their geometrical and dispersive surface properties. The synthesised catalysts were tested with cyclohexane oxidation reactions using H2O2, to make the catalytic system eco-friendly. Compared to the previously reported catalysts, the present catalysts have shown better cyclohexane conversion and selectivity, and are also cost effective. Among the three catalysts studied, Cu(II) catalyst showed the maximum conversion efficiency (44%) with product selectivity of 29% cyclohexanol and 71% cyclohexanone. Because of the combination of interesting structural properties and acceptable catalytic property with better selectivity and environment benign character along with a low cost, these hybrid catalysts could be the best future catalysts for cyclohexane oxidation.
机译：有机和无机实体已经使用3-氨丙基三乙氧基硅烷（APTES）接头进行了杂交，以合成三种新型的有机-无机杂化催化剂[Cu（II），Co（II）和Ni（II）]。在合成过程中，将静态无机部分用通用的亚胺（C = N）基团官能化。制备的催化剂通过光谱技术（EDS，FT-IR，DR UV-Vis。，Si-29 CP / MAS NMR，粉末-XRD和ESR），热研究（TG-DTG）和表面研究（SEM和AFM）进行表征）。由于其几何和分散的表面性质，所报道的催化剂是重要的。使用H2O2对合成的催化剂进行了环己烷氧化反应测试，以使催化体系环保。与先前报道的催化剂相比，本发明的催化剂显示出更好的环己烷转化率和选择性，并且还具有成本效益。在研究的三种催化剂中，Cu（II）催化剂显示出最高的转化效率（44％），产物选择性为29％环己醇和71％环己酮。由于令人感兴趣的结构性质和可接受的催化性质与更好的选择性和对环境有益的特性以及低成本的结合，这些杂化催化剂可能成为未来环己烷氧化的最佳催化剂。

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