Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 52, Pages 23491-23495Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202009397
Keywords
CO(2)adsorption; in situ PXRD; nanozeolites; precession-assisted 3D ED; template-free synthesis
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Funding
- CARNOT ESP (project NZAMS-CO2)
- TOTAL
- Industrial Chair ANR-TOTAL Nanoclean Energy
- Normandy Region through the RIN Recherche Program
- MEYS CR [LM2018110, CZ.2.16/3.1.00/24510]
- Czech Science Foundation [19-08032S]
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Small-pore zeolites such as chabazite (CHA) are excellent candidates for the selective separation of CO2; however, the current synthesis involves several steps and the use of organic structure-directing agent (OSDA), increasing their cost and energy requirements. We report the synthesis of small-pore zeolite crystals (aluminosilicate) with CHA-type framework structure by direct synthesis in a colloidal suspension containing a mixture of inorganic cations only (Na+, K+, and Cs+). The location of CO(2)molecules in the host structure was revealed by 3D electron diffraction (3D ED). The high sorption capacity for CO2(3.8 mmol g(-1)at 121 kPa), structural stability and regenerability of the discreate CHA zeolite nanocrystals is maintained for 10 consecutive cycles without any visible degradation. The CHA zeolite (Si:Al=2) reaches an almost perfect CO(2)storage capacity (8 CO(2)per unit cell) and high selectivity (no CH(4)was adsorbed).
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