An epoxide ring-opening reaction by using sol–gel-synthesized palladium supported on a strontium hydroxyl fluoride catalyst
作者:Vaibhav R. Acham、Mohan K. Dongare、Erhard Kemnitz、Shubhangi B. Umbarkar
DOI:10.1016/j.crci.2016.07.008
日期:2016.10
Résumé Palladium supported on a strontium hydroxyl fluoride catalyst was synthesized by a one-pot fluorolytic sol–gel method. The prepared catalyst was characterized by various physicochemical techniques. The sol–gel method has led to the formation of a high surface area (57 m2g−1), mesoporous (pore diameter = 13.0 nm) catalyst with uniform dispersion of Pd nanoparticles of size ∼7 nm on the surface of strontium hydroxyl fluoride. The catalyst was used for epoxide alcoholysis, and 100% conversion was obtained with 96% selectivity for β-alkoxy alcohols under mild conditions. The catalyst could be recycled for up to three catalytic cycles without any appreciable decrease in conversion and selectivity, indicating the stability of the catalyst under the reaction conditions. Further, the mechanism of alcoholysis was proposed on the basis of the physicochemical characteristics of the catalyst and on the basis of the products formed during the catalytic reaction.
摘要
通过一种一锅法氟解溶胶-凝胶法合成了支持钯的氢氧化锶氟化物催化剂。所制备的催化剂通过多种物理化学技术进行了表征。该溶胶-凝胶法形成了一个高比表面积(57 m²/g)、介孔(孔径= 13.0 nm)的催化剂,钯 nanoparticles 的均匀分散在氢氧化锶氟化物表面,粒径约为7 nm。催化剂用于苯氧醇解反应,在温和条件下获得100%的转化率和96%对 β-烷氧醇的选择性。该催化剂可回收使用达三个催化循环,转化率和选择性没有显著下降,表明催化剂在反应条件下的稳定性。此外,基于催化剂的物理化学特性和催化反应中形成的产物,提出了醇解反应的机理。