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High value utilization of residual biochar from sorption-enhanced hydrogen-rich syngas production: CO2 conversion, supercapacitors and catalytic supports

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Listed:
  • Liu, Hongyu
  • Tang, Yuting
  • Tang, Jiehong
  • Yue, Wenchang
  • Ma, Xiaoqian

Abstract

Sorption-enhanced hydrogen-rich syngas production from biomass (SEHB) based on the calcium looping (CaL) results in residual biochar due to temperature limitations. The high-value utilization of residual biochar is crucial for improving the economic viability of the SEHB process. This study explored the value-added utilization of the residual biochar in three scenarios: CO2 conversion, supercapacitors and catalytic supports. The results demonstrated that in CO2 conversion, biochar exhibited low CO2 conversion rates and activation treatment further inhibited the conversion process. In the field of supercapacitors, the biochar achieved a specific capacitance of 166.6 F/g at 0.5 A/g in a three-electrode system. Symmetric supercapacitors assembled with the biochar delivered a high energy density of 9.3 Wh/kg and exhibited good cycling stability. In the field of catalytic supports, the biochar-based support increased the gas yield to 48.12 mmol/gbiomass, representing a 21.9% improvement. Additionally, it effectively inhibited the methane cracking and reduced coke formation. This study provided new methods for solving the biochar disposal problem in the SEHB process.

Suggested Citation

  • Liu, Hongyu & Tang, Yuting & Tang, Jiehong & Yue, Wenchang & Ma, Xiaoqian, 2026. "High value utilization of residual biochar from sorption-enhanced hydrogen-rich syngas production: CO2 conversion, supercapacitors and catalytic supports," Energy, Elsevier, vol. 347(C).
    • Handle: RePEc:eee:energy:v:347:y:2026:i:c:s0360544226004214
    DOI: 10.1016/j.energy.2026.140318
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    References listed on IDEAS

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