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个人信息Personal Information
教授
博士生导师
硕士生导师
性别：男
毕业院校：中科院大连化学物理研究所
学位：博士
所在单位：化工学院
学科：工业催化. 能源化工
办公地点：西部校区化工实验楼B-323
联系方式：0411-84986326
电子邮箱：wpzhang@dlut.edu.cn
Synthesis of polymorph A-enriched beta zeolites in a HF-concentrated system
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论文类型：期刊论文
发表时间：2016-04-21
发表刊物：DALTON TRANSACTIONS
收录刊物：SCIE、EI、PubMed
卷号：45
期号：15
页面范围：6634-6640
ISSN号：1477-9226
摘要：Polymorph A-enriched beta zeolites were synthesized by employing high HF concentrations in the synthesis medium. The polymorphic compositions of the synthesized beta zeolites were determined by the complementary characterization methods F-19 NMR analysis and PXRD simulation. With a variety of SDAs, a high HF concentration (HF/SDA > 1.0) in the synthesis medium results in the A-rich feature (55-65% A) of beta zeolites, while a moderate HF concentration only results in typical beta zeolites. A systematic study on the synthesis conditions reveals the existence of a buffered system of H+ and F- formed in the highly HF-concentrated medium. This buffer results in a small but continuous supply of F- during zeolite crystallization, in contrast to the conventional fluoride route where all F-are discharged all-at-once at the initial stage.
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