Improvement of the carbon yield from biomass carbonization through sulfuric acid pre-dehydration at room temperature

作者：Wang, Chenxi; Zou, Rongge; Qian, Moriko; Kong, Xiao; Huo, Erguang; Lin, Xiaona; Wang, Lu; Zhang, Xuesong; Ruan, Roger; Lei, Hanwu^*

来源：Bioresource Technology, 2022, 355: 127251.

DOI：10.1016/j.biortech.2022.127251

• Biomass
• Pre-dehydration
• Carbonization
• Biochar
• Carbon recovery

The pre-dehydration of a woody biomass waste (Douglas fir, DF) with 4.6-32 wt% of diluted sulfuric acid solutions was carried out mainly at room temperature aimed to improve the carbon yield from the thermal carbonization of pre-dehydrated biomass at 500 degrees C. By comparison (based on the raw DF), the pre-dehydration at room temperature increased the biochar yield and carbon retention up to about 32 wt% and 54%, respectively from that of about 22 wt% and 39% without pre-dehydration. When the pre-dehydration temperature increased to 90 degrees C, the biochar yield and carbon retention were sharply promoted to about 44 wt% and 76%, which was about two times higher than that of the biochar obtained without pre-treatment. This work for the first time proved the effectiveness of improving the carbon yield from lignocellulosic biomass via diluted sulfuric acidassisted pre-dehydration at low or even room temperature.

• 单位
  中国农业大学; 山东理工大学