期刊
JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY
卷 2021, 期 -, 页码 -出版社
HINDAWI LTD
DOI: 10.1155/2021/5554568
关键词
-
资金
- Vietnam National University, Hanoi (VNU) [QG.19.09]
By carefully controlling the composition of reaction mixtures, the interzeolite conversion of FAU-type zeolites to CHA-type zeolites was successfully achieved, yielding highly crystalline CHA zeolites. High-silica CHA zeolites were synthesized using inexpensive organic structure-directing agents, with Si/Al ratio ranging from 5 to 140. The study highlights the importance of structural similarity between zeolite precursors, nucleation/crystallization processes, and the zeolite product in interzeolite conversion compared to traditional amorphous aluminosilicate gels.
The interzeolite conversion of faujasite (FAU-type) zeolites to chabazite (CHA-type) zeolite in the presence of N,N,N-trimethyladamantammonium and N,N,N-dimethylethylcyclohexylammonium cations was investigated over a large compositional range by carefully controlling the reaction mixture compositions. Highly crystalline CHA zeolites were also obtained by the transformation of several zeolite types including EMT, LTL, LEV, RTH, and MFI frameworks. The formation of CHA zeolite from FAU zeolite precursors was substantially faster than that from zeolite L with a similar composition. High-silica CHA zeolites were also produced successfully using a mixture of TMAda with a number of less expensive organic structure-directing agents. The CHA zeolite materials have been synthesized with high crystallinity and with a Si/Al ratio ranging from 5 to 140. Our data support the importance of structural similarity between the zeolite precursors, nucleation/crystallization processes, and the zeolite product in the interzeolite conversion compared to conventional amorphous aluminosilicate gels. Our synthetic methods could be used to prepare other 8-membered ring zeolites such as AEI and AFX frameworks, potential candidates for selective catalytic reduction of NOx, light olefin production, and CO2 abatement.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据