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Integrated gasification and catalytic reforming syngas production from corn straw with mitigated greenhouse gas emission potential

Hu, Jianjun, Li, Dun, Lee, Duu-Jong, Zhang, Quanguo, Wang, Wei, Zhao, Shuheng, Zhang, Zhiping, He, Chao
Bioresource technology 2019 v.280 pp. 371-377
biomass, carbon dioxide, carbon monoxide, corn straw, feedstocks, gasification, greenhouse gas emissions, greenhouse gases, hydrogen, methane, synthesis gas, temperature, wastes
The syngas that is produced from waste biomass often has high levels of CH₄ and CO₂, which are greenhouse gases. This investigation presents an integrated gasification and catalytic reforming process with a closed gas loop that can improve quality of syngas from corn straw and mitigate CH₄ and CO₂ emission. The effects of the support type, reforming temperature, steam-to-biomass (S/B) ratio, and catalyst-to-biomass ratio (C/B) ratio on gas yield and composition were experimentally examined with waste corn straw as the feedstock gasified at 850 °C in the proposed closed-loop apparatus. Reformation of syngas using Ni/γ-Al₂O₃ at 850 °C, S/B = 1 and C/B = 0.5 yielded 1.16 m³/kg of syngas, which contained 48.5% H₂, 33.9% CO, 12.2% CO₂ and 5.3% CH₄, corresponding to 71.0% and 81.5% enhancements of the first two and −77.8% and −58.1% reductions of the last two components.