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Journal Articles Angewandte Chemie International Edition Year : 2020

Synthesis of Discrete CHA Zeolite Nanocrystals without Organic Templates for Selective CO 2 Capture

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Nikolai Nesterenko

Abstract

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 CO2 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 CO2 storage capacity (8 CO2 per unit cell) and high selectivity (no CH4 was adsorbed).
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hal-03027983 , version 1 (27-11-2020)

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Maxime Debost, Paul B. Klar, Nicolas Barrier, Edwin B. Clatworthy, Julien Grand, et al.. Synthesis of Discrete CHA Zeolite Nanocrystals without Organic Templates for Selective CO 2 Capture. Angewandte Chemie International Edition, 2020, 59 (52), pp.23491-23495. ⟨10.1002/anie.202009397⟩. ⟨hal-03027983⟩
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