A theoretical and shock tube kinetic study on hydrogen abstraction from phenyl formate
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摘要The hydrogen abstraction reactions of phenyl formate (PF) by different radicals (H/O(P-3)/OH/HO2) were theoretically investigated. We calculated the reaction energetics for PF + H/O/OH using the composite method ROCBS-QB3//M06-2X/cc-pVTZ and that for PF + HO2 at the M06-2X/cc-pVTZ level of theory. The high-pressure limit rate constants were calculated using the transition state theory in conjunction with the 1-D hindered rotor approximation and tunneling correction. Three-parameter Arrhenius expressions of rate constants were provided over the temperature range of 500-2000 K. To validate the theoretical calculations, the overall rate constants of PF + OH Products were measured in shock tube experiments at 968-1128 K and 1.16-1.25 atm using OH laser absorption. The predicted overall rate constants agree well with the shock tube data (within 15%) over the entire experimental conditions. Rate constant analysis indicates that the H-abstraction at the formic acid site dominates the PF consumption, whereas the contribution of H-abstractions at the aromatic ring increases with temperature. Additionally, comparisons of site-specific H-abstractions from PF with methyl formate, ethyl formate, benzene, and toluene were performed to understand the effects of the aromatic ring and side-chain substituent on H-abstraction rate constants.
著者Hongbo Ning, Dapeng Liu, Junjun Wu, Liuhao Ma, Wei Ren, Aamir Farooq
期刊名稱Physical Chemistry Chemical Physics
出版年份2018
月份9
日期7
卷號20
期次33
出版社Royal Society of Chemistry
頁次24580 - 21285
國際標準期刊號1463-9076
電子國際標準期刊號1463-9084
語言美式英語
關鍵詞Combustion, chemical kinetics, shock tube

上次更新時間 2021-15-05 於 23:13