苯基磺酸官能化中孔硅基材料的制备及催化性能研究

通过溶胶-凝胶法制得了苯基聚硅氧烷, 进一步磺化制备了苯基磺酸官能化的中孔硅基催化材料, 并通过BET, SEM和固体核磁技术对其进行了表征. BET结果表明, 该催化剂比表面积为722 m²/g, 平均孔径为9.06 nm, 孔容0.59 mL/g. ¹³C CPMAS NMR和²⁹Si CPMAS NMR表征显示磺酸基键合于苯环间位, 苯基以共价方式进入无机-有机杂化硅基材料的内部结构. 该固体酸的活性中心磺酸基在表面呈均匀分布, 在芳族羧酸和取代酚的直接酯化反应中表现出优异的催化性能.

Preparation and Catalytic Performance of Phenylsulfonic Acid Functionalized Mesoporous Silica

Phenylsulfonic acid functionalized mesoporous silica as catslyst was synthesized by sol-gel technique to form a precursor bearing phenyl groups followed by further sulfonation, and characterized by BET, SEM and solid NMR. The nitrogen adsorption-desorption isotherms indicated that the specific area of the catalyst was 722 m2/g, the average pore size ca. 9.06 nm and pore volume 0.59 cm3/g. C and Si 13 29 CPMAS NMR spectra showed that the phenyl ring bonded with sulfonic acid group in meta-position covalently interacts with the framework of the hybrid materials. With an even distribution of active sites for the sulfonic acid groups, the catalyst showed a highly catalytic performance in esterification of various aromatic carboxylic acids with substituted phenol.