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MWW结构分子筛是一类新型的催化材料,具有独特的10元环孔道和12元环孔穴结构,在多种反应中表现出良好的催化活性。以六亚甲基亚胺作为模板剂,合成了MCM-22、MCM-49和MCM-56三种分子筛,并详细考察了不同硅源、凝胶配比、晶化温度和晶化时间对合成过程的影响。结果表明,凝胶配比和晶化温度对分子筛物相的影响较大。以硅胶粉为硅源,无论在何种晶化时间下都不能得到MCM-56,只能合成出MCM-49。而以碱性硅溶胶为硅源,在较短的晶化时间内就可以得到MCM-56。
MWW structural molecular sieve is a new type of catalytic material with a unique 10-membered ring pore and 12-membered ring pore structure, showing good catalytic activity in a variety of reactions. Three molecular sieves, MCM-22, MCM-49 and MCM-56, were synthesized using hexamethyleneimine as a template. The effects of different silica sources, gel ratio, crystallization temperature and crystallization time on the synthesis of The impact of the process. The results show that the ratio of gel and crystallization temperature have great influence on the molecular sieve phase. With silica powder as silicon source, MCM-56 can not be obtained no matter what kind of crystallization time, only MCM-49 can be synthesized. The alkaline silica sol as a silicon source, in a short crystallization time can be obtained MCM-56.