Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions
This paper reports a systematic investigation on the primary decomposition mechanism and kinetics of cellobiose under hydrothermal conditions at 200-275 °C and a wide initial concentration range of 10-10,000 mg L-1. Isomerization of cellobiose to cellobiulose (glucosyl-fructose) and glucosyl-mannose...
| Main Authors: | , , |
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| Format: | Journal Article |
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American Chemical Society
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/28690 |
| _version_ | 1848752604213936128 |
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| author | Shafie, Z.M. Yu, Yun Wu, Hongwei |
| author_facet | Shafie, Z.M. Yu, Yun Wu, Hongwei |
| author_sort | Shafie, Z.M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | This paper reports a systematic investigation on the primary decomposition mechanism and kinetics of cellobiose under hydrothermal conditions at 200-275 °C and a wide initial concentration range of 10-10,000 mg L-1. Isomerization of cellobiose to cellobiulose (glucosyl-fructose) and glucosyl-mannose dominates the primary reactions of cellobiose decomposition, contributing to 71-93% of cellobiose decomposition depending on reaction conditions. In contrast, cellobiosehydrolysis to glucose makes only limited contributions (6-27% depending on reaction conditions) to the primary decomposition of cellobiose. This indicates that hydroxyl ions have a more significant effect to catalyze the isomerization reactions to produce cellobiulose and glucosyl-mannose. The catalytic effect of hydronium ions is weak probably because of the high affinity ofhydronium ions for water molecules, which reduces the availability of hydronium ions for catalyzing the hydrolysis reaction. At increased temperatures, the affinity of hydronium ions for water molecules decreases because of the weakened hydrogen bonds in water, leading to an increase in the selectivity of the acid-catalyzed hydrolysis reaction. A higher initial cellobiose concentrationalso promotes hydrolysis reaction due to the formation of acidic products at the early stage of cellobiose decomposition. As a result of the reduced molar ratio of ion product to cellobiose, the activation energies of both isomerization and hydrolysis reactions increase with an increase in initial concentration, leading to an increase in the apparent activation energy of cellobiosehydrothermal conversion. |
| first_indexed | 2025-11-14T08:11:15Z |
| format | Journal Article |
| id | curtin-20.500.11937-28690 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:11:15Z |
| publishDate | 2014 |
| publisher | American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-286902017-09-13T15:52:51Z Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions Shafie, Z.M. Yu, Yun Wu, Hongwei This paper reports a systematic investigation on the primary decomposition mechanism and kinetics of cellobiose under hydrothermal conditions at 200-275 °C and a wide initial concentration range of 10-10,000 mg L-1. Isomerization of cellobiose to cellobiulose (glucosyl-fructose) and glucosyl-mannose dominates the primary reactions of cellobiose decomposition, contributing to 71-93% of cellobiose decomposition depending on reaction conditions. In contrast, cellobiosehydrolysis to glucose makes only limited contributions (6-27% depending on reaction conditions) to the primary decomposition of cellobiose. This indicates that hydroxyl ions have a more significant effect to catalyze the isomerization reactions to produce cellobiulose and glucosyl-mannose. The catalytic effect of hydronium ions is weak probably because of the high affinity ofhydronium ions for water molecules, which reduces the availability of hydronium ions for catalyzing the hydrolysis reaction. At increased temperatures, the affinity of hydronium ions for water molecules decreases because of the weakened hydrogen bonds in water, leading to an increase in the selectivity of the acid-catalyzed hydrolysis reaction. A higher initial cellobiose concentrationalso promotes hydrolysis reaction due to the formation of acidic products at the early stage of cellobiose decomposition. As a result of the reduced molar ratio of ion product to cellobiose, the activation energies of both isomerization and hydrolysis reactions increase with an increase in initial concentration, leading to an increase in the apparent activation energy of cellobiosehydrothermal conversion. 2014 Journal Article http://hdl.handle.net/20.500.11937/28690 10.1021/ie5027309 American Chemical Society restricted |
| spellingShingle | Shafie, Z.M. Yu, Yun Wu, Hongwei Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions |
| title | Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions |
| title_full | Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions |
| title_fullStr | Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions |
| title_full_unstemmed | Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions |
| title_short | Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions |
| title_sort | insights into the primary decomposition mechanism of cellobiose under hydrothermal conditions |
| url | http://hdl.handle.net/20.500.11937/28690 |