Sequential Combination of Acid and Base for Conversion of Cellulose
Autor: | Yaw D. Yeboah, Ungkana Wongsiriwan, Yu Noda, Chunshan Song, Pattarapan Prasassarakich |
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Rok vydání: | 2012 |
Předmět: | |
Zdroj: | Energy & Fuels. 26:2376-2385 |
ISSN: | 1520-5029 0887-0624 |
Popis: | Depolymerization of cellulose is a significant part of the challenge in converting lignocellulosic biomass to valuable products such as monomeric sugars. Aiming to develop a new approach for efficient depolymerization of cellulose, we explored a sequential combination of organic acid (oxalic acid, OA) and base (tetramethylammonium hydroxide, TMAH). In hydrolysis reactions of cellulose at 150 °C, we demonstrated the enhancing effect of a sequential combination on its conversion. In two-step experiments, the highest conversion (73.0%) was achieved when the reaction with acid was followed by that with base (OA-TMAH sequence), which is greater than the prolonged treatment with either acid or base alone. In the residue after the reaction with OA, a more disordered, amorphous-like structure was present compared to raw cellulose and the sample after that with TMAH alone, as evidenced by 13C cross-polarization magic angle spinning nuclear magnetic resonance (CPMAS NMR) and powder X-ray diffraction (XRD) measureme... |
Databáze: | OpenAIRE |
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