Title : SILP materials based on TiO2 SiO2 support as efficient and recyclable catalytic systems for hydrosilylation reaction
Abstract:
Catalytic processes are one of the most important branches of the chemistry. Heterogeneous catalysts which reduce the costs of the reaction and enable their easy isolation and reuse, are very important aspects of this field. One of the more and more used heterogenization method of homogeneous catalysts is application of Supported Ionic Liquid Phase (SILP) systems. Preparation of SILP materials containing metals or metal complexes is carried out by immobilizing the active substance on the surface of a porous support, covered with a thin layer of ionic liquid. This method allows to increase catalysts stability and durability. Hence, obtained materials are used in many chemical reactions, e.g. in hydrosilylation processes. It is worth noting that in SILP systems very often silica materials are used as a support and hybrid oxide systems, such as TiO2 -SiO2 , have not already been used in this type of catalytic systems. The hydrosilylation reaction is one of the leading methods of obtaining silicone products, such as rubbers, sealants, adhesives or modified polymers. This reaction also enables the production of organofunctional silicones, which due to the introduction of functional groups into their structures are chemically reactive. The hydrosilylation process is a catalytic reaction, mainly catalysed by homogeneous transition metal complexes. Therefore, due to the economic and ecological aspects of the above process, it is important to use heterogeneous catalytic systems, that enable easy isolation and reuse in subsequent catalytic cycles. The presented research results refer to new SILP systems with TiO2 -SiO2 materials. In the conducted research also the influence of the structure of the support and applied ionic liquid on the catalytic efficiency in the hydrosilylation reaction was examined. Prepared materials were subjected to extensive physicochemical and adsorption analysis.
