OSDA-free and steam-assisted synthesis of PHI type zeolite showing a unique CO2 adsorption behaviour

被引:7
|
作者
Higuchi, Yuto [1 ]
Miyagawa, Sana [1 ]
Tanaka, Shunsuke [1 ,2 ]
机构
[1] Kansai Univ, Dept Chem Energy & Environm Engn, Fac Environm & Urban Engn, 3-3-35 Yamate Cho, Suita, Osaka 5648680, Japan
[2] Kansai Univ, Org Res & Dev Innovat Sci & Technol ORDIST, 3-3-35 Yamate Cho, Suita, Osaka 5648680, Japan
关键词
UNIVALENT CATION FORMS; ION-EXCHANGE; CARBON-DIOXIDE; CHA ZEOLITE; Y-ZEOLITES; MEMBRANES; TRANSFORMATION; SEPARATION; CHABAZITE; MFI;
D O I
10.1039/d2ce00440b
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The best way to synthesize industrially useful zeolites is to avoid the use of costly organic structure-directing agent (OSDA) and the generation of synthetic wastewater. Recently, steam-assisted conversion methods have provided a new route for synthesizing zeolites under environment friendly conditions. In this study, the synthetic conditions for OSDA-free interzeolite conversion of FAU zeolite to CHA, phillipsite (PHI), and ANA zeolites were investigated. Importantly, green synthesis of the pure PHI phase was successfully achieved for the first time, by the OSDA-free steam-assisted interzeolite conversion method. More importantly, the amount of CO2 adsorbed on PHI zeolite increased by ion exchange of alkaline cations from Na+ to K+, Rb+, and Cs+. Of particular interest is that K+-, Rb+-, and Cs+-exchanged PHI zeolites show unusual and sigmoid CO2 adsorption isotherms. Remarkably, as the radius of the alkaline cation increases, the sharp increase in the sigmoid adsorption branch shifts to higher pressures.
引用
收藏
页码:3859 / 3864
页数:7
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