Hydrogen production from autothermal CO2 gasification of cellulose in a fixed-bed reactor: influence of thermal compensation from CaO carbonation

Shuming Zhang, Su He, Ningbo Gao*, Jianqiao Wang, Yihang Duan, Cui Quan, Boxiong Shen*, Chunfei Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Biomass gasification is a promising technology to produce renewable syngas used for energy and chemical applications. However, biomass gasification has challenges of low process energy efficiency, low syngas production with low H2/CO ratio and the sintering of biomass ash which limit the deployment of the technology. This work investigated the influence of in-situ generated heat from CaO–CO2 on cellulose CO2 gasification using a fixed bed reactor, thermogravimetric analysis-Fourier transform infrared spectroscopy (TGA-FTIR) and differential scanning calorimetry (DSC). Experimental results indicate an approximate 20 °C temperature difference in the fix-bed reactor between cellulose CO2 gasification with the energy compensation of CaO carbonation (denoted auto-thermal biomass gasification) and conventional CO2 gasification of cellulose after the power of external furnaces were turned off. Around 5 times H2/CO molar ratio is obtained after switching off the power in the auto-thermal biomass gasification compared with conventional gasification. The gas yield enhances significantly from 0.29 g g−1 cellulose to 0.56 g g−1 cellulose when CaO/cellulose mass ratio increases from 0 to 5. Furthermore, the TGA-FTIR results demonstrate the feasibility of adopting energy compensation of CaO carbonation to reduce the gasification temperature. DSC analysis also proves that the released heat from the CaO–CO2 reaction reduces the required energy for cellulose degradation.

Original languageEnglish
Pages (from-to)41480-41487
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume47
Issue number98
Early online date24 Nov 2022
DOIs
Publication statusPublished - 19 Dec 2022

Keywords

  • Biomass gasification
  • Thermal compensation
  • CaO carbonation

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