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Syngas production from biomass using Fe-based oxygen carrier: Optimization

Hu, Jianjun, Li, Chong, Lee, Duu-Jong, Guo, Qianhui, Zhao, Shuheng, Zhang, Quanguo, Li, Dun
Bioresource technology 2019 v.280 pp. 183-187
adverse effects, biomass, carbon, carbon monoxide, corn stover, experimental design, gasification, heat, hydrogen, iron, oxygen, peanut hulls, prediction, rice straw, steam, synthesis gas, temperature, wheat straw
Chemical looping gasification is a promising technology to convert biomass into syngas with low adverse effects by heat loss and production dilution. This study utilized 60% loading Fe₂O₃/Al₂O₃ oxygen carrier (OC) for gasification tests on four biomass samples: rice straw, corn stalk, peanut shell and wheat straw under OC/biomass (OC/B) ratio of 1.0, steam/biomass (S/B) ratio of 2.8, reaction time of 20 min, and reaction temperature of 850 °C. All biomass samples yielded similar gasification performances: CO content 19.2–23.1%, H₂ content 36.5–41.1%, carbon conversion rate 72.3–82.2% and gas yield 0.78–1.04 L/g. The gasification performance using rice straw was optimized on maximum H₂/CO ratio using three levels Box-Behnken experimental design: 899.6 °C, 20.3 min, OC/B = 1.02 and S/B = 2.89, leading to maximum H₂/CO value of 2.20. Verification tests confirmed this prediction. The adopted Fe-based OC can be applied to generate syngas from the tested biomass with promising outcomes.