Utilizing steel slag in sorption-enhanced biomass gasification: A pathway to syngas production with integrated CO2 capture

Hongyu Liu, Yuting Tang, Jiehong Tang, Wenchang Yue, Weilong Chen, Xinfei Chen and Xiaoqian Ma

Applied Energy, 2026, vol. 402, issue PB, No S0306261925017404

Abstract: Developing economical catalysts is of significant importance for the advancement of the sorption-enhanced gasification technology. In this study, through fixed-bed experiments and Aspen Plus simulations, the potential of steel slag as a catalyst in the biomass sorption-enhanced gasification process was comprehensively explored. The sorption-enhanced gasification experimental results indicated that steel slag could facilitate the sorption-enhanced gasification reaction, with the gas yield increasing from 250.3 ml/gbiomass in the absence of catalysts to 389.8 ml/gbiomass, representing an increment of 55.73 %. The typical components of steel slag, Fe2O3 and CaO, could enhance the yield of gas in the sorption-enhanced gasification, while SiO2 exhibited a relatively minor promoting effect. Furthermore, after five cycles of tests, the steel slag demonstrated a gas yield of 341.4 ml/gbiomass, exhibiting good cyclic stability. However, the low selectivity of gas products limited the application of steel slag in the sorption-enhanced gasification. Enhancing the specific surface area and oxygen reactivity of steel slag was potential directions for improving its sorption-catalytic properties. The Aspen results indicated that the introduction of steel slag led to a 41.64 % increase in the annual production income of methanol. This study provided valuable insights into the high-value utilization of steel slag.

Keywords: Steel slag; Sorption-enhanced; Steam gasification; Biomass; Syngas (search for similar items in EconPapers)
Date: 2026
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DOI: 10.1016/j.apenergy.2025.127010

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