Strong Pt-γ-AlOOH interaction engineered electron-rich Pt sites for efficient olefin hydrosilylation

The Pt/γ-AlOOH-IP was prepared using γ-AlOOH support by impregnation method. • The strong MSI and electron-rich Pt sites are fabricated in Pt/γ-AlOOH-IP. • Pt/γ-AlOOH-IP exhibits excellent catalytic performance in the hydrosilylation. • Electron-rich Pt sites promote the TES adsorption and Si–H bond cleavage. Hydrosilylation is a highly important method for the preparation of organosilicon compounds, in which homogeneous Pt catalysts exist poor recyclability and high production costs. Here, we prepared supported Pt-based catalyst (Pt/γ-AlOOH-IP) using γ-AlOOH support by impregnation (IP) method, in which strong metal-support interactions (MSI) and electron-rich Pt sites were fabricated. Catalytic measurements show that Pt/γ-AlOOH-IP has the best catalytic activity in the conversion of 1-octene and triethoxysilane (TES)via hydrosilylation to n-octyltriethoxysilane (OTES), the yield of OTES is 93.6% with 94.3% selectivity at 80 ℃, 2.5 h, m (Pt) /m (1-octene) = 7.5 × 10 −5 and n (TES) /n (1-octene) = 1.33, which are commensurate with homogeneous Karstedt’s catalyst. The significant catalytic performance of Pt/γ-AlOOH-IP originates from more electron transfer between Pt and γ-AlOOH. Electron-rich Pt sites promote TES chemisorption and Si–H bond dissociation, and improve catalytic activity, which are corroborated by the DFT calculations. This finding enhances the insight of MSI and offers an easy method to prepare efficient heterogeneous catalysts for industrial hydrosilylation reactions. Download: Download high-res image (166KB) Download: Download full-size image