Process for preparing SBA-15 surfical sulfonic group modified mesoporous molecular sieve

Abstract

Disclosed is a method for preparation of molecular sieve modified by SBA- 15 surface sulfuric acid group, which contains the step: with polymer of the polyethylene glycol- polyglycerol- polyethylene glycol as the template agent, 3-mercaptopropyl-trimethoxysilane condensing ethyl orthosilicate in a acid condition, and by the oxidization of hydroperoxide, the molecular sieve modified by propanesulfonic acid being synthesized. The method for preparation is simple, the operation is easy, and the reaction condition is mild; the acid containing and the structure of the molecular can be regulated and controlled by regulating the matching of materials and processing parameter, the acid quantity being among 0.48- 1.15mmolH+ / g, specific surface being among 445- 680m2 / g, and the pore diameter being among 5.47- 7.58nm.

Description

technical field [0001] The invention belongs to a method for preparing mesoporous molecular sieves, in particular to a method for preparing mesoporous molecular sieves modified with sulfonic acid groups on the surface of SBA-15 Background technique [0002] In recent years, inorganic materials functionalized with organic groups have attracted increasing interest, mainly because such organic-inorganic hybrid materials can tune their catalytic and adsorption properties by designing organic acid functional groups in the pores ( Fowler C.E. et al. Chemistry Communication, 1997, 1769). At present, most researches focus on SiO 2 The surface of the carrier is functionalized, and the organic functional group is connected to the inorganic matrix through the O-Si-C bond. The synthesis method is mainly divided into a post-synthesis method and a one-step synthesis method. The post-synthesis method (also called surface grafting method) is to generate organic-inorganic hybrid materials ...

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Problems solved by technology

At present, the post-synthesis method is often used in the synthesis process of organic acid-modified mesoporous materials. Although the organic-inorganic hybrid materials prepared by the post-synthesis method can completely maintain the structure of the molecular sieve, the distribution of the modified groups is uneven, and most of them are located at the pores. The inner surface and the outer surface are not evenly distributed on the surface of the pore, and the preparation process is relatively complicated. Many chemical raw materials are required in the modification process, resulting in high catalyst cost and long preparation cycle, which is not suitable for the industrialization of catalysts.