Liu Minghui, Huang He, An Changwei, Feng Xue, Wang Zijing
College of Biomedical and Chemical Engineering, Liaoning Institute of Science and Technology, No. 176 Xianghuai Road, Benxi 117004, China.
School of Petrochemical Engineering, Liaoning Shihua University, Fushun 113001, China.
Nanomaterials (Basel). 2024 Jun 26;14(13):1095. doi: 10.3390/nano14131095.
The dehydrocoupling reaction between alcohols and hydrosilanes is considered to be one of the most atom-economical ways to produce Si-O coupling compounds because its byproduct is only hydrogen (H), which make it extremely environmentally friendly. In past decades, various kinds of homogeneous catalysts for the dehydrocoupling of alcohols and hydrosilanes, such as transition metal complexes, alkaline earth metals, alkali metals, and noble metal complexes, have been reported for their good activity and selectivity. Nevertheless, the practical applications of these catalysts still remain unsatisfactory, which is mainly restricted by environmental impact and non-reusability. A facile and recyclable heterogeneous catalyst, ultra-small Ag nanoparticles supported on porous carbon (Ag/C) for the etherification of silanes, has been developed. It has high catalytic activity for the Si-O coupling reaction, and the apparent activation energy of the reaction is about 30 kJ/mol. The ultra-small Ag nanoparticles dispersed in the catalyst through the carrier C have an enrichment effect on all reactants, which makes the reactants reach the adsorption saturation state on the surface of Ag nanoparticles, thus accelerating the coupling reaction process and verifying that the kinetics of the reaction of the catalyst indicate a zero-grade reaction.
醇与氢硅烷之间的脱氢偶联反应被认为是生产Si-O偶联化合物最原子经济的方法之一，因为其副产物只有氢气（H），这使其具有极高的环境友好性。在过去几十年中，已经报道了各种用于醇与氢硅烷脱氢偶联的均相催化剂，如过渡金属配合物、碱土金属、碱金属和贵金属配合物，它们具有良好的活性和选择性。然而，这些催化剂的实际应用仍然不尽人意，这主要受到环境影响和不可重复使用性的限制。一种用于硅烷醚化的简便且可回收的非均相催化剂——负载在多孔碳上的超小银纳米颗粒（Ag/C）已被开发出来。它对Si-O偶联反应具有高催化活性，反应的表观活化能约为30 kJ/mol。通过载体C分散在催化剂中的超小银纳米颗粒对所有反应物具有富集作用，这使得反应物在银纳米颗粒表面达到吸附饱和状态，从而加速了偶联反应过程，并证明该催化剂反应动力学表明为零级反应。
