期刊
BIORESOURCE TECHNOLOGY
卷 182, 期 -, 页码 336-344出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.02.024
关键词
Hydrothermal carbonization; HTC biochar; pH; Fiber analysis; Pore analysis
资金
- Bioenergy program delegated from the German Federal Ministry of Research and Education (BMBF), Germany
- Western Sun Grant Initiative, USA [C0432G-C]
In this study, influence of feedwater pH (2-12) was studied for hydrothermal carbonization (HTC) of wheat straw at 200 and 260 degrees C. Acetic acid and KOH were used as acidic and basic medium, respectively. Hydrochars were characterized by elemental and fiber analyses, SEM, surface area, pore volume and size, and ATR-FTIR, while HTC process liquids were analyzed by HPLC and GC. Both hydrochar and HTC process liquid qualities vary with feedwater pH. At acidic pH, cellulose and elemental carbon increase in hydrochar, while hemicellulose and pseudo-lignin decrease. Hydrochars produced at pH 2 feedwater has 2.7 times larger surface area than that produced at pH 12. It also has the largest pore volume (1.1 x 10(-1) ml g(-1)) and pore size (20.2 nm). Organic acids were increasing, while sugars were decreasing in case of basic feedwater, however, phenolic compounds were present only at 260 degrees C and their concentrations were increasing in basic feedwater. (C) 2015 Elsevier Ltd. All rights reserved.
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