Impact of chabazite SSZ-13 textural properties and chemical composition on CO₂ adsorption applications

Chabazite SSZ-13 samples with varying silica content (Si/Al from 5 to B20) were synthesized under both stirring and static conditions to obtain materials with changing particle size and morphology and thoroughly analysed using various characterization techniques. The role of particle size and chemical compositions in CO₂ and N₂ adsorption measurements was investigated. The Si/Al ratio played a major role in CO₂ adsorption; Al-rich SSZ-13 demonstrated a higher CO₂ uptake than an Al-poor material. This was attributed to the high density of active charged species in the chabazite cage. The particle size also played a role in the sorption capacities; smaller particles, obtained under stirring conditions, showed enhanced CO₂ uptake compared to larger particles of similar chemical composition. This was associated with a higher contribution of micro-pores containing active sites for CO₂ adsorption. (authors)