High CO2 Adsorption on Improved ZSM-5 Zeolite Porous Structure Modified with Ethylenediamine and Desorption Characteristics with Microwave

抄録

Synthesized ZSM-5 zeolite with large pore surface structures and modified with ethylenediamine (EDA) were used to achieve high CO₂ adsorption capacity from the gas stream. The effect of alkali earth metals, granite, bentonite and starch on the porosity and crystallinity of zeolite has been studied. The maximum amine adsorption in synthesized zeolite obtained was 450 mg/g of zeolite. The CO₂ capture process was investigated when the zeolite contained 70 %, 50 % and 10% of amine in the presence of 2 % and 5% water at the constant temperature of 75^oC. The highest CO₂ adsorption capacity obtained was 6.13 mmol/g of synthesized ZSM-5 containing 70% EDA and 5% water. During the adsorption experiment, no drawback caused by filling the surface pores of zeolite was observed which indicates larger internal channels and well distributed pores on the surface of synthesized zeolite. Following the adsorption, MW energy was used to remove the adsorbed CO₂ for the effective reuse of the adsorbents. Desorption efficiency reached 100% for the samples containing 70 % and 50 % EDA after 9 and 13 min of MW irritation, while the maximum desertion rate obtained was 60 % for the sample containing 10 % of EDA.