An Experimental and Theoretical Study of the Thermal Decomposition of C4H6 Isomers

被引:21
作者
Lockhart, James P. A. [1 ]
Goldsmith, C. Franklin [2 ]
Randazzo, John B. [1 ]
Ruscic, Branko [1 ,3 ]
Tranter, Robert S. [1 ]
机构
[1] Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA
[2] Brown Univ, Sch Engn, Providence, RI 02912 USA
[3] Univ Chicago, Computat Inst, Chicago, IL 60637 USA
基金
美国国家科学基金会;
关键词
ACTIVE THERMOCHEMICAL TABLES; PHENOMENOLOGICAL RATE COEFFICIENTS; SHOCK-TUBE; LASER-SCHLIEREN; AB-INITIO; AROMATIC-COMPOUNDS; MASS-SPECTROMETRY; MASTER EQUATION; HYDROGEN-ATOMS; SELF-REACTION;
D O I
10.1021/acs.jpca.7b01186
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The chemistry of small unsaturated hydrocarbons, such as 1,3-butadiene (1,3-C4H6), 1,2-butadiene (1,2-C4H6), 2-butyne (2-C4H6), and 1-butyne (1-C4H6), is of central importance to the modeling of combustion systems. These species are important intermediates in combustion processes, and yet their high-temperature chemistry remains poorly understood, with various dissociation and isomerization pathways proposed in the literature. Here we investigate the thermal decompositions of 1,3-C4H6, 1,2-C4H6, 2-C4H6, and 1-C4H6 inside a diaphragmless shock tube, at postshock total pressures of 26-261 Torr and temperatures ranging from 1428 to 2354 K, using laser schlieren densitometry. The experimental work was complemented by high-level ab initio calculations, which collectively provide strong evidence that formally direct dissociation is the major channel for pyrolysis of 1,3-C4H6 and 2-C4H6; these paths have not been previously reported but are critical to reconciling the current work and disparate literature reports. The reaction mechanism presented here simulates the current experiments and experimental data from the literature very well. Pressure- and temperature-dependent rate coefficients are given for the isomerization, formally direct, and direct dissociation paths.
引用
收藏
页码:3827 / 3850
页数:25
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