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

Nnamdi Ofuani and Prakashbhai Bhoi ()
Additional contact information
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

Sustainability, 2024, vol. 16, issue 12, 1-18

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.

Keywords: carbon dioxide; sustainable utilization; biochar; gasification; syngas; carbon conversion (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/16/12/5044/pdf (application/pdf)
https://www.mdpi.com/2071-1050/16/12/5044/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:16:y:2024:i:12:p:5044-:d:1414132

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().