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Carbon Dioxide Gasification of Biochar: A Sustainable Way of Utilizing Captured CO 2 to Mitigate Greenhouse Gas Emission

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  • Nnamdi Ofuani

    (Department of Mechanical Engineering, Georgia Southern University, Statesboro, GA 30460, USA)

  • Prakashbhai Bhoi

    (Department of Mechanical Engineering, Georgia Southern University, Statesboro, GA 30460, USA)

Abstract

This study proposes CO 2 gasification of biochar as a potential carbon utilization pathway for greenhouse gas emission reduction. It aims to evaluate the effects of CO 2 concentration on carbon and CO 2 conversion and output CO yield. It also performs kinetic analysis, using the volume reaction model, to determine the activation energy and pre-exponential factor. The operating conditions utilized include gasification temperatures of 700, 800, and 900 °C; inlet CO 2 concentrations of 15%, 30%, 45%, and 60% by volume (N 2 balance); and a CO 2 flow rate of 5 L/min. Carbon dioxide gasification of biochar was performed in a fixed bed batch reactor, and the composition of the output gases was analyzed. Increases in the temperature and inlet CO 2 concentration both resulted in an increase in carbon conversion, with the maximum carbon conversion of 57.1% occurring at 900 °C and a 60% inlet CO 2 concentration. The results also showed that CO 2 conversion increased against temperature but decreased with an increasing inlet CO 2 concentration. The maximum CO 2 conversion of 76% was observed at 900 °C and a 15% inlet CO 2 concentration. An activation energy in the range of 109 to 117 kJ/mol and a pre-exponential factor in the range of 63 to 253 s −1 were determined in this study.

Suggested Citation

  • Nnamdi Ofuani & Prakashbhai Bhoi, 2024. "Carbon Dioxide Gasification of Biochar: A Sustainable Way of Utilizing Captured CO 2 to Mitigate Greenhouse Gas Emission," Sustainability, MDPI, vol. 16(12), pages 1-18, June.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:12:p:5044-:d:1414132
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    References listed on IDEAS

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    1. Ahmed, I.I. & Gupta, A.K., 2011. "Kinetics of woodchips char gasification with steam and carbon dioxide," Applied Energy, Elsevier, vol. 88(5), pages 1613-1619, May.
    2. Shen, Ye & Li, Xian & Yao, Zhiyi & Cui, Xiaoqiang & Wang, Chi-Hwa, 2019. "CO2 gasification of woody biomass: Experimental study from a lab-scale reactor to a small-scale autothermal gasifier," Energy, Elsevier, vol. 170(C), pages 497-506.
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