Density functional theory studies on the formation mechanism of CO and CO<sub>2</sub> in pyrolysis of hydroxyl butyraldehyde and butyric acid

HUANG Jin-bao; TONG Hong; ZENG Gui-sheng; XIE Yu; LI Wei-min

Volume 40 Issue 08

Aug. 2012

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HUANG Jin-bao, TONG Hong, ZENG Gui-sheng, XIE Yu, LI Wei-min. Density functional theory studies on the formation mechanism of CO and CO2 in pyrolysis of hydroxyl butyraldehyde and butyric acid[J]. Journal of Fuel Chemistry and Technology, 2012, (08): 979-984.

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HUANG Jin-bao, TONG Hong, ZENG Gui-sheng, XIE Yu, LI Wei-min. Density functional theory studies on the formation mechanism of CO and CO₂ in pyrolysis of hydroxyl butyraldehyde and butyric acid[J]. Journal of Fuel Chemistry and Technology, 2012, (08): 979-984.

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Density functional theory studies on the formation mechanism of CO and CO₂ in pyrolysis of hydroxyl butyraldehyde and butyric acid

1.
School of Science, Guizhou University for Nationalities, Guiyang 550025, China;
2.
School of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China;
3.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China

Received Date: 2011-11-03
Rev Recd Date: 2012-02-19
Publish Date: 2012-08-31

Abstract

Abstract

The pyrolysis of 2,3,4-hydroxyl-butyraldehyde and 2,3,4-hydroxyl-butyric acid as model compounds was investigated by using B3LYP/cc-pVTZ methods to reveal the decarbonyl and decarboxyl mechanism. Three possible pathways for the pyrolysis of each model compound were designed and the standard thermodynamic and kinetic parameters of each reaction path at different temperatures were determined. The results showed that the release of CO and CO₂ during the cellulose pyrolysis is related to the decarbonyl and decarboxyl reactions, respectively; both involve a concerted process via intra-molecular hydrogen transfer. Decarboxyl reaction is endothermic while decarbonyl reaction is exothermic. The activation energy of decarbonyl reaction of 2,3,4-hydroxyl-butyraldehyde is 288.8 kJ/mol, while the activation energy of decarbonyl reaction of undersaturated olefine aldehyde after dehydration is higher than that for saturated aldehyde. The activation energy of decarboxyl reaction of 2,3,4-hydroxyl-butyric acid is 303.4 kJ/mol, while the activation energy of decarboxyl reaction of undersaturated olefine acid after dehydration is much lower, indicating that the dehydration favors the release of CO₂.
- 2,3,4-hydroxyl-butyraldehyde,
- 2,3,4-hydroxyl-butyricacid,
- decarbonyl reaction,
- decarboxyl reaction,
- density functional theory (DFT)

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References

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