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

Abstract

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.