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Hydrothermal carbonization (HTC) of wheat straw: Influence of feedwater pH prepared by acetic acid and potassium hydroxide
- 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.
Author details: | M. Toufiq Reza, Erwin Rottler, Laureen Herklotz, Benjamin Wirth |
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DOI: | https://doi.org/10.1016/j.biortech.2015.02.024 |
ISSN: | 0960-8524 |
ISSN: | 1873-2976 |
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/25710573 |
Title of parent work (English): | Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformation, production technologies |
Publisher: | Elsevier |
Place of publishing: | Oxford |
Publication type: | Article |
Language: | English |
Year of first publication: | 2015 |
Publication year: | 2015 |
Release date: | 2017/03/27 |
Tag: | Fiber analysis; HTC biochar; Hydrothermal carbonization; Pore analysis; pH |
Volume: | 182 |
Number of pages: | 9 |
First page: | 336 |
Last Page: | 344 |
Funding institution: | Bioenergy program delegated from the German Federal Ministry of Research and Education (BMBF), Germany; Western Sun Grant Initiative, USA [C0432G-C] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
Peer review: | Referiert |
Institution name at the time of the publication: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften |