表面含磺酸基的介孔分子筛催化剂SBA-15-SO3H的制备及其催化性能

采用直接和后合成两种方法制备出含碘酸基的介孔分子筛SBA－15－SO3H，用XRD和红外光谱分析制备过程中催化剂结构和组成的变化。结果表明，两种方法制备出的含磺酸基的催化剂都保持了SBA－15分子筛的完整晶体结构，并含有质子酸中心－SO3H；固体核磁共振表征结果证明，两种方法都使MPTMS存在于分子筛的表面；用N2吸附－脱附测定了它们的比表面积、孔径和孔容；TGA分析认为，MPTMS在分子筛表面的热稳定性大于300℃，酸碱滴定结果说明，地接法获得的催化剂的酸中心多于后合成法，酯化反应结果表明，直接法合成的催化剂比后合成法具有更高的稳定性，且简便、快捷、高效。

Prepararion of Highly Active Esterification Catalyst SBA-15 Mesoporous Silica Functionalized with Sulfonic Acid Group

Well-ordered, mesoporous, hybrid SBA-15 materials containing alkyl(methyl) and sulfonic acid group were prepared by post and direct-synthesis methods in the presence of triblock copolymer P123 as the structure-directing agent under acid conditions. The materials have been characterized by powder \{X-ray\} diffraction,nitrigon gas sorption(BET), FTIR, themogravimetric weight loss(TGA) and solid state 29Si MAS NMR. XRD result shows the two kinds of catalysts have the SBA-15 structure characters (hexagonal, p6mm). FTIR and 29Si-MAS-NMR results show the surface of SBA-15 functionalized by the organic-silica group and the acid site is B acid site. BET shows them has a large surface area and large pore size. TGA shows they have a higher thermal stability than sulfonic acid resin. They are efficient catalysts for the esterification of methanol with oleic acid. The d-SBA-15-SO 3H catalyst has a higher hydrothermal stability and hydrophobicity than p-SBA-15-SO 3H. The d-SBA-15-SO 3H can be reused many times, and the activity can retain stable. The direct synthesis method is more simple, convenient and efficient comparison with the post synthesis method.