Abstract
Syngas produced from supercritical water gasification typically contain a high amount of CO2 along with H2. In order to improve the quality of syngas, amine-functionalized copper benzene-1,3,5-tricarboxylate (Cu-BTC) was synthesized as an effective adsorbent for selective removal of CO2 from syngas to increase the concentration of H2. The amines used in this study included monoethanolamine (MEA), ethylenediamine (EDA), and polyethyleneimine (PEI). The fundamental physicochemical character of adsorbents, CO2 adsorption capacity, and CO2/H2 selectivity were analyzed. The physicochemical characterization indicated that the structure of amine-functionalized Cu-BTC was partially damaged, which resulted in a decrease in specific surface area and pore volume. On the other hand, the enlarged pore size was beneficial for the mass transfer of gas in the adsorbent. Among these adsorbents, Cu-BTC/PEI exhibited the maximum CO2 adsorption capacity of 3.83 mmol/g and the highest CO2/H2 selectivity of 19.74. It was found that the adsorption pressure is the most significant factor for the CO2 adsorption capacity. Lower temperature and higher pressure were favored for CO2 adsorption capacity and CO2/H2 selectivity, so physical adsorption by Cu-BTC played a dominant role. Moreover, Cu-BTC/PEI can be well-regenerated with stable adsorption efficiency after five consecutive cycles. These findings suggested that Cu-BTC/PEI could be a promising alternative adsorbent for CO2 capture from syngas.
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All authors contributed in the study’s conception and experimental design. Material preparation was performed by Guolei Zhu and Xiangzhi Kong. Investigation, data collection, and analysis were performed by Yan Zhang, Teng Cang, and Dan Wang. Manuscript preparation was done by Yan Zhang and Haryo Wibowo. Supervision, interpretation of results, and review and editing were performed by Mi Yan and Ekkachai Kanchanatip, and all authors commented on previous versions of the manuscript. All authors have read and approved the final manuscript.
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Yan, M., Zhang, Y., Zhu, G. et al. Hydrogen-rich syngas upgrading via CO2 adsorption by amine-functionalized Cu-BTC: the effect of different amines. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33646-7
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DOI: https://doi.org/10.1007/s11356-024-33646-7