The result showed that direct calcination of MCM-41 samples in the presence of air for template removal caused collapse of the molecular sieve structure and dealumination of the framework was obvious;
结果表明，采用在空气中直接焙烧的方法脱除模板剂在一定的程度上破坏了MCM-41分子筛的结构完整性，骨架脱铝现象最明显；
The molecular sieve effect of the kerogen's big molecule wet structure is a direct reason.
干酪根大分子结构的分子筛作用，是产生“蓝移”现象的直接原因；
Latest researches in SAPO-18 molecular sieve were reviewed with respect to its synthesis, structure, acidity and application in methanol-to-olefins (MTO) process.
介绍了SAPO - 18分子筛的合成、结构组成、酸性表征及其在催化甲醇制烯烃(MTO)反应中应用的最新研究情况。
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