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论文类型： 期刊论文

发表时间： 2019-01-29

发表刊物： RSC ADVANCES

收录刊物： SCIE、Scopus

卷号： 9

期号： 7

页面范围： 3653-3660

ISSN号： 2046-2069

关键字： Aluminum compounds; Pore structure; Silica; Sodium compounds; Zeolites, Acidic properties; Hierarchical pores; Hydrothermal methods; Internal defects; Nano aggregates; Possible mechanisms; SiO2/Al2O3 ratio; Species distributions, Fluorine compounds

摘要： An aerosol-assisted hydrothermal method has been applied to synthesizing hierarchical beta zeolites with SiO2/Al2O3 ratios ranging from 44 to 392 in NaF media. Two different morphologies, including nano-aggregates with interparticle mesopores and plate-like zeolites with intracrystalline mesopores, can be formed depending on the SiO2/Al2O3 ratios of the synthesis gels. A possible mechanism for the formation of the beta zeolites has been proposed. The obtained beta zeolites show hierarchical pores, good Al species distribution and less internal defect sites. Evaluation, by the cracking of 1,3,5-triisopropylbenzene (1,3,-TIPB), is consistent with the acidic properties and the pore structure of beta zeolites with different ratios of SiO2/Al2O3.