Preparation of efficient and recoverable organosulfonic acid functionalized alkyl-bridged organosilica nanotubes for esterification and transesterification
Preparation of efficient and recoverable organosulfonic acid functionalized alkyl-bridged organosilica nanotubes for esterification and transesterification
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用于酯化和酯交换反应的高效且可回收的有机磺酸官能化烷基桥有机硅纳米管的制备
DOI：
10.1016/j.apcatb.2014.07.047
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发表时间：
2015-02
期刊：
影响因子：
--
通讯作者：
Y. H. Guo
中科院分区：
文献类型：
--
作者：
D. Y. Song;S. An;B. Lu;Y. H. Guo
首次采用非离子表面活性剂模板溶胶-凝胶共缩合法合成了一系列芳烃磺酸或丙磺酸功能化的乙烷或苯桥联的有机硅纳米管杂化催化剂Si（Ph/Et）Si-Ar/Pr-SO 3 H NTs。通过TEM、氮气孔隙率测定和酸碱滴定等手段对复合催化剂的孔结构、结构和酸性进行了表征，并用13 C CP-MAS NMR和29 Si MAS NMR研究了复合催化剂中有机磺酸基团和硅/碳骨架的结构完整性.以棕榈酸酯化反应和黄角籽油与甲醇的酯交换反应为研究对象，考察了Si（Ph/Et）Si-Ar/Pr-SO 3 H NTs作为新型固体酸催化剂的催化活性和稳定性。基于物化性质和催化性能测试结果，发现所制备的管状杂化催化剂具有较高的酸强度和酸中心密度、独特的结构特性、有趣的形貌以及疏水表面，具有优异的多相酸催化性能.
A series of arenesulfonic or propylsulfonic acid functionalized ethane- or benzene-bridged organosilica nanotubes hybrid catalysts, Si(Ph/Et)Si-Ar/Pr-SO3H NTs, was demonstrated for the first time by a single step nonionic surfactant-templated sol–gel co-condensation approach. The pore morphologies, textual and acidic properties of as-prepared hybrid catalysts were characterized by TEM observations, nitrogen gas porosimetry measurements and acid–base titration, while the structural integrity of the incorporated organosulfonic acid groups and silica/carbon framework in the hybrid catalysts were studied by13C CP-MAS NMR and29Si MAS NMR. As the novel solid acid catalysts, the catalytic activity and stability of the Si(Ph/Et)Si-Ar/Pr-SO3H NTs were evaluated by esterification of palmitic acid and transesterification of yellow horn seed oil with methanol under refluxing temperature (65 °C) and atmospheric pressure. Based on the physicochemical properties and catalytic testing results, the excellent heterogeneous acid catalytic behaviors of as-prepared tubular hybrid catalysts were revealed in terms of their considerably high Brønsted acid-site density and acid strength, unique textural properties, interesting morphology as well as hydrophobic surface.
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