Highly-selective Pt/PAA@MIL-125 Catalyst for Hydrosilylation of γ-(2,3-Epoxypropoxy) Trimethoxysilane

Abstract

γ-(2,3-Epoxypropoxy) trimethoxysilane is a crucial silicone product synthesized by hydrosilylation. Its derived downstream silicone products have galvanized the development of silicone industry. However, the Speier’s or Karstedt’s catalysts commonly utilized in its industrial process are homogeneous, leading to complications, such as low catalytic selectivity and recycling difficulty. Herein, a new heterogeneous platinum catalyst was developed by using a titanium-based metal organic framework (MIL-125) composite with polylactic acid (PAA) as the support. The as-synthesized Pt/PAA-2@MIL-125 catalyst exhibited impressive catalytic performance, producing a 97% yield in β-product, and maintained recyclability for the synthesis of γ-(2,3-epoxypropoxy) trimethoxysilane. Further characterization analyses revealed that the introduction of PAA resulted in the formation of a defective mesoporous MIL-125, which accelerated the transmission efficiency of reactants. Moreover, the abundant carboxylic acid groups in the MIL-125/PAA composite could interact strongly with Pt active species, thereby enhancing the catalytic performance and minimizing the loss of Pt, ultimately improving its cycling performance. The comprehensive experiments demonstrated the potential of this catalyst as an effective and versatile heterogeneous catalyst not only for the hydrosilylation of various olefins, but also for the hydrosilyation of silanes.

Keywords

γ-(2,3-Epoxypropoxy) trimethoxysilane / Hydrosilylation / Metal-organic framework

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