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Promoting steam gasification and mitigating potassium release: The role of NaAlO2 in agricultural biomass conversion

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  • Yang, Liu
  • Li, Runze
  • Li, Jiazhou
  • Zhang, Wei
  • Chen, Zhewen
  • Zhang, Yuming
  • Zhang, Shu

Abstract

To address the ash related issues caused by potassium (K) species evaporation during agricultural biomass gasification procedure, it is feasible to add additives for efficient and clean biomass gasification. In this study, the effect of NaAlO2 on catalytic efficiency and potassium retention in gasification residues was investigated using a fixed-bed vertical reactor. The results indicated that higher content of NaAlO2 correlated with greater biomass gasification efficiency. The main catalytic effect came from CO2 adsorption by sodium hydroxide generated via NaAlO2 hydrolysis and synergism with inherent alkali and alkaline earth metals (AAEMs). At a 20 wt% NaAlO2 addition ratio, the concentration of hydrogen in the syngas reached 47.5 vol%. FTIR and N2 adsorption-desorption revealed that NaAlO2 addition altered functional groups distribution and resulted in the collapse of pores. SEM-EDS and ICP-OES analysis exhibited that the addition of NaAlO2 could fix inherent potassium into gasification residues and mitigate agglomeration during gasification procedure. XRD results further confirmed potassium fixation as potassium aluminosilicates. This research provides a practical strategy for equipment corrosion caused by alkali metal vapors in intrinsic ash and promote biomass gasification meanwhile.

Suggested Citation

  • Yang, Liu & Li, Runze & Li, Jiazhou & Zhang, Wei & Chen, Zhewen & Zhang, Yuming & Zhang, Shu, 2026. "Promoting steam gasification and mitigating potassium release: The role of NaAlO2 in agricultural biomass conversion," Renewable Energy, Elsevier, vol. 267(C).
    • Handle: RePEc:eee:renene:v:267:y:2026:i:c:s0960148126006166
    DOI: 10.1016/j.renene.2026.125790
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