Effect of initial pH on hydrothermal decomposition of cellobiose under weakly acidic conditions
The paper reports the cellobiose hydrothermal decomposition at 200–250 °C under non-catalytic (with an initial pH close to 7) and weakly acidic conditions (with an initial pH of 4–6). It was found cellobiose decomposition under both non-catalytic and weakly acidic conditions follows similar primary...
| Main Authors: | , , |
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| Format: | Journal Article |
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Elsevier Ltd
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/19118 |
| _version_ | 1848749941772517376 |
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| author | Mohd Shafie, Zainun Yu, Yun Wu, Hongwei |
| author_facet | Mohd Shafie, Zainun Yu, Yun Wu, Hongwei |
| author_sort | Mohd Shafie, Zainun |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The paper reports the cellobiose hydrothermal decomposition at 200–250 °C under non-catalytic (with an initial pH close to 7) and weakly acidic conditions (with an initial pH of 4–6). It was found cellobiose decomposition under both non-catalytic and weakly acidic conditions follows similar primary decomposition pathways, i.e., isomerization and hydrolysis reactions being the main primary reactions. However, cellobiose decomposition under acidic conditions decreases the selectivities of isomerization reactions but increases the selectivity of hydrolysis reaction. While the rate constants of isomerization reactions under various pH conditions are found to be similar, that of hydrolysis reaction increases significantly with reducing the initial pH of the solution. Therefore, the acceleration of cellobiose decomposition under acidic conditions is mainly due to the increased contribution of hydrolysis reaction. Further analysis suggests that the rate constant of hydrolysis reaction is dependent on the hydrogen ion concentration of the solution at reaction temperature. A kinetic model was then developed, considering the isomerization and hydrolysis reactions. The model can well predict the cellobiose hydrothermal decomposition under various initial pH conditions at low temperatures (i.e., <225 °C). However, the model underestimates the rate constant of cellobiose hydrothermal decomposition at higher temperatures (i.e., 250 °C), suggesting the increased contribution of other reactions (e.g., reversion reactions) under the conditions. |
| first_indexed | 2025-11-14T07:28:56Z |
| format | Journal Article |
| id | curtin-20.500.11937-19118 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:28:56Z |
| publishDate | 2015 |
| publisher | Elsevier Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-191182017-09-13T15:42:43Z Effect of initial pH on hydrothermal decomposition of cellobiose under weakly acidic conditions Mohd Shafie, Zainun Yu, Yun Wu, Hongwei Biofuel Acidic conditions Hydrothermal Isomerization Cellobiose The paper reports the cellobiose hydrothermal decomposition at 200–250 °C under non-catalytic (with an initial pH close to 7) and weakly acidic conditions (with an initial pH of 4–6). It was found cellobiose decomposition under both non-catalytic and weakly acidic conditions follows similar primary decomposition pathways, i.e., isomerization and hydrolysis reactions being the main primary reactions. However, cellobiose decomposition under acidic conditions decreases the selectivities of isomerization reactions but increases the selectivity of hydrolysis reaction. While the rate constants of isomerization reactions under various pH conditions are found to be similar, that of hydrolysis reaction increases significantly with reducing the initial pH of the solution. Therefore, the acceleration of cellobiose decomposition under acidic conditions is mainly due to the increased contribution of hydrolysis reaction. Further analysis suggests that the rate constant of hydrolysis reaction is dependent on the hydrogen ion concentration of the solution at reaction temperature. A kinetic model was then developed, considering the isomerization and hydrolysis reactions. The model can well predict the cellobiose hydrothermal decomposition under various initial pH conditions at low temperatures (i.e., <225 °C). However, the model underestimates the rate constant of cellobiose hydrothermal decomposition at higher temperatures (i.e., 250 °C), suggesting the increased contribution of other reactions (e.g., reversion reactions) under the conditions. 2015 Journal Article http://hdl.handle.net/20.500.11937/19118 10.1016/j.fuel.2015.05.023 Elsevier Ltd restricted |
| spellingShingle | Biofuel Acidic conditions Hydrothermal Isomerization Cellobiose Mohd Shafie, Zainun Yu, Yun Wu, Hongwei Effect of initial pH on hydrothermal decomposition of cellobiose under weakly acidic conditions |
| title | Effect of initial pH on hydrothermal decomposition of cellobiose under weakly acidic conditions |
| title_full | Effect of initial pH on hydrothermal decomposition of cellobiose under weakly acidic conditions |
| title_fullStr | Effect of initial pH on hydrothermal decomposition of cellobiose under weakly acidic conditions |
| title_full_unstemmed | Effect of initial pH on hydrothermal decomposition of cellobiose under weakly acidic conditions |
| title_short | Effect of initial pH on hydrothermal decomposition of cellobiose under weakly acidic conditions |
| title_sort | effect of initial ph on hydrothermal decomposition of cellobiose under weakly acidic conditions |
| topic | Biofuel Acidic conditions Hydrothermal Isomerization Cellobiose |
| url | http://hdl.handle.net/20.500.11937/19118 |