Autors: Boycheva, S. V., Chakarova, K., Mihaylov, M., Hadjiivanov, K., Popova, M.
Title: Effect of calcium on enhanced carbon capture potential of coal fly ash zeolites. Part II: a study on the adsorption mechanisms
Keywords: Carbon capture, Coal fly ash, Ca content, Zeolite X

Abstract: Coal fly ash zeolites (CFAZs) of type X with low (Na-X) and medium (Na-Ca-X) content of calcium were synthesized by alkaline conversion of lignite coal fly ash generated by combustion of lignite with lower and higher limestone amounts, extracted from different coal deposits and burned in separate thermal power plants. The concentration and state of Ca in the zeolites were investigated by energy dispersive X-ray (EDX) analysis and X-ray photoelectron spectroscopy (XPS). CFAZs Na-Ca-X with a medium Ca-content were found to outperform their lower calcium counterparts Na-X in terms of carbon capture capacity. This provoked our research interest in elucidating the role of Ca in the CO2 retaining mechanism. CFAZs Na-X and Na-Ca-X were studied in consecutive dynamic adsorption cycles, after thermal regeneration at a temperature of 80 °C, at which only the physically adsorbed CO2 molecules can be released.

References

    Issue

    Environmental Science: Processes and Impacts, vol. 24, issue 10, pp. 1934-1944, 2022, United Kingdom, Royal Society of Chemistry, DOI 10.1039/d2em00252c

    Copyright Royal Society of Chemistry

    Цитирания (Citation/s):
    1. Fan, Y., Huang, R., Liu, Q., Cao, Q., Guo, R. Synthesis of zeolite A from fly ash and its application in the slow release of urea (2023) Waste Management, 158, pp. 47-55. https://www.scopus.com/inward/record.uri?eid=2-s2.0-85146056722&doi=10.1016%2fj.wasman.2022.12.031&partnerID=40&md5=1e20c8da237961b5459af81b828168ec doi: 10.1016/j.wasman.2022.12.031; Source: Scopus - 2023 - в издания, индексирани в Scopus или Web of Science

    Вид: статия в списание, публикация в издание с импакт фактор, публикация в реферирано издание, индексирана в Scopus и Web of Science