Rational Design of Pt Supported Catalysts for Hydrosilylation: Influence of Support and Calcination Temperature

The hydrosilylation reaction plays a key role in organosilicon chemistry, enabling the formation of silicon-carbon bonds crucial for industrial and specialty chemical production. While homogeneous platinum catalysts are incredibly efficient, they come with drawbacks like limited recyclability and high Pt consumption, necessitating researchers to develop more durable, heterogeneous alternatives. By harnessing the synergies of support materials and thermal treatment, this study aims to develop highly active heterogeneous platinum-supported catalysts for the hydrosilylation reaction. We synthesized Pt-supported catalysts on nine different metal oxide supports using impregnation and heat treatment at 500 – 1000 oC. Among them, Pt/CeO2 900H, prepared by calcining Pt-supported CeO2 at 900 °C, followed by reducing it with hydrogen at 500 °C, emerged as the most effective catalyst for alkene hydrosilylation, achieving a turnover number (TON) of 6.9 × 106, comparable to the widely used Karstedt catalyst. For alkyne hydrosilylation, Pt/CeO2 600C and Pt/ZrO2 500C demonstrated outstanding performance. These catalysts, prepared by calcining Pt-impregnated CeO2 at 600 °C and ZrO2 at 500 °C, respectively, exhibited remarkable activity and stability, maintaining high performance over 10 reaction cycles. These findings highlight how the right combination of support material and thermal treatment can fine-tune Pt catalysts for more sustainable hydrosilylation processes. By providing a scalable and cost-effective alternative to traditional homogeneous catalysts, this work connects fundamental research with industrial applications, advancing greener and more efficient approaches to organosilicon synthesis.