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...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 inβ-product,and maintained recyclability for the synthesis ofγ-(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.展开更多
Spectrophotometric method was used to evaluate the kinetic of the complex formation from the reaction between H[Ru(III)Cl2(H2EDTA)] and the modifier agent [3-(2-aminoethyl)aminopropyl] trimethoxysilane (AEATS) (μ = 0...Spectrophotometric method was used to evaluate the kinetic of the complex formation from the reaction between H[Ru(III)Cl2(H2EDTA)] and the modifier agent [3-(2-aminoethyl)aminopropyl] trimethoxysilane (AEATS) (μ = 0.50 mol.dm-3 with NaCF3COO, 298.15 K), in pseudo-first order conditions. These studies showed that the reactions are successives producing several species influenced by the concentrations ratio. The electronics spectrum of all solutions showed a band in 457 nm with variable molar absorptivity (ε).展开更多
基金supported by the National Natural Science Foundation of China(Nos.22262023,22261032,21961021)the Natural Science Foundation of Jiangxi Province,China(No.20202ACB203001)the Fund of Key Laboratory of Nanchang City,China(No.2021NCZDSY-005).
文摘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 inβ-product,and maintained recyclability for the synthesis ofγ-(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.
文摘Spectrophotometric method was used to evaluate the kinetic of the complex formation from the reaction between H[Ru(III)Cl2(H2EDTA)] and the modifier agent [3-(2-aminoethyl)aminopropyl] trimethoxysilane (AEATS) (μ = 0.50 mol.dm-3 with NaCF3COO, 298.15 K), in pseudo-first order conditions. These studies showed that the reactions are successives producing several species influenced by the concentrations ratio. The electronics spectrum of all solutions showed a band in 457 nm with variable molar absorptivity (ε).
