In this study, a series of chabazite zeolites with different extra-framework cations (K+, Cs+, Ca2+, Sr2+, Ba2+, Zn2+) were synthesized and prepared by ion exchange with a parent chabazite (KNaCHA) produced from zeolite Y. These chabazite zeolites were studied for selective CO2 adsorption by using characterization and analytical methods including powder X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, gas sorption, Solid State Magic Angle Spinning Nuclear Magnetic Resonance, in situ infrared spectroscopy. The results showed that CHA framework in zeolites were formed successfully after crystallization from zeolite Y. It can be also found that due to the difference in valence and size between extra-framework cations, these synthesised chabazite zeolites have different adsorption ability. Monovalent and big cations (K+ and Cs+) are able to block nitrogen, which are confirmed by very low N2 BET surface areas (about 20 m2 g-1), however, are able to interact with CO2 to get it through, even CO2 is bigger than N2. These results suggest a method to synthesise materials from natural resource to reduce the environment impact of CO2 by a novel size-inverse separation.
|Publication status||Published - Jul 2015|
|Event||Summer Showcase 2015 - University of Bath, Bath, United Kingdom|
Duration: 6 Jul 2015 → 8 Jul 2015
|Conference||Summer Showcase 2015|
|Period||6/07/15 → 8/07/15|