CO2 capture by modified clinoptilolite and its regeneration performance

Autor: Bo Jiang, Bo Zhang, Xuqin Duan, Yi Xing
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: International Journal of Coal Science & Technology, Vol 11, Iss 1, Pp 1-10 (2024)
Druh dokumentu: article
ISSN: 2095-8293
2198-7823
DOI: 10.1007/s40789-023-00661-x
Popis: Abstract This study focuses on CO2 capture by pressure swing adsorption (PSA), with modified clinoptilolite as the adsorbent. Natural clinoptilolite is modified by roasting, by acid pickling, by a combination of acid pickling and roasting, and by ion exchange. Modification by acid pickling–roasting and by ion exchange are found to give the highest CO2 adsorption capacities, of 730 mL/g and 876.7 mL/g, respectively. It is found that regeneration of clinoptilolite by a combination of vacuum desorption and heating enables recovery of as much as 89% of its previous CO2 adsorption capacity. To examine the CO2 adsorption capacity of clinoptilolite when applied to mixed gas, a simulated coking exhaust containing 12% CO2 and 4% O2 is used, and it is found that ion exchange modified clinoptilolite achieves a CO2 removal efficiency of 92.5%. A BET test reveals that acid pickling–roasting and Na+ modification enhance the porosity of clinoptilolite, thereby improving its adsorption capacity. This work demonstrates the feasibility of applying modified clinoptilolite as an effective adsorbent for CO2 capture, providing a promising tool for dealing with greenhouse gases.
Databáze: Directory of Open Access Journals
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