Pressure-dependent kinetics on benzoyl radical + O2 and its implications for low temperature oxidation of benzaldehyde (PDF)
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Pressure-dependent kinetics on benzoyl radical + O2 and its implications for low temperature oxidation of benzaldehyde (PDF)
- 发表刊物：
- Combust Flame
- 摘要：
- Toluene is present in significant amounts of the aromatic compounds of real-fuel. Its fundamental combustion characteristics have attracted much attention. Benzaldehyde is a key intermediate in toluene oxidation and could have a potential impact in the construction of a toluene kinetic mechanism. Unfortunately, the understanding of benzaldehyde oxidation mechanism has not as yet reached consensus in the combustion community. Benzoyl as primary intermediate of benzaldehyde after H-atom abstraction, the recognition of its consumption pathway is to direct dissociation in both high- and low-temperature regimes, without considering the reaction channels of C6H5ĊO + 3O2. In order to clarify the importance of this acyl radical addition to oxygen reaction in aldehydes oxidation particularly at low temperatures. The potential energy surface of C6H5ĊO + 3O2 was evaluated at the DLPNO-CCSD(T)/cc-pVTZ//M06-2X/6-311++G(d,p) level of theory. RRKM/ME calculations were performed on the C6H5ĊO + 3O2 reaction using thermochemical and kinetic parameters obtained from the ab-initio calculations, with micro-canonical variational transition state theory for treatment of barrierless kinetics. Impact of the newly calculated reaction channels on auto-ignition and oxidation of benzaldehyde was investigated computationally. Current results reveal that the benzaldehyde sub-mechanisms derived from different sources take on distinguished sensitivity for updating the C6H5ĊO + 3O2 kinetics. Thermodynamic analysis was carried out to interpret the dependence of benzaldehyde model performance on C6H5ĊO + 3O2 kinetics. Thermodynamic parameters of benzoyl radical was calculated by the compounded methods of G3, G4 and CBS-APNO due to the excessive effect on equilibrium of reaction for benzoyl consumption. Our results indicate that more accurate determination of thermochemistry of benzoyl is critical to improve the model capability of benzaldehyde in prediction of ignition delay time and identification of species evolution at lower temperature in particular.
- 合写作者：
- Zhao Q, Zhang F, Zhang YJ, Huang ZH
- 卷号：
- 2020, 214, 139-151
- 页面范围：
- 139-151
- 是否译文：
- 否
- 发表时间：
- 2020-04-10