Shock Wave and Theoretical Modeling Study of the Dissociation of CH2F2. I. Primary Processes.

Shock Wave and Theoretical Modeling Study of the Dissociation of CH2F2. I. Primary Processes.
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CH2F2 I初级过程解离的冲击波和理论模拟研究

DOI:
10.1021/acs.jpca.7b05854
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发表时间:
2017
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
J. Troe
J. Troe
中科院分区:
--
文献类型:
--
作者:
C. J. Cobos;Hintzer;L. Sölter;E. Tellbach;A. Thaler;J. Troe

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本文用量子化学计算和单分子速率理论研究了CH_2F_2单分子解离生成CF_2 + H_2、CHF + HF或CHF_2 + H的过程。建模的速率常数是伴随着冲击波实验在1400-1800 K的范围内,监测CF2的形成。结果表明,能量上最有利的解离通道导致CF2+ H2具有较高的阈值能量比能量上不太有利的导致CHF + HF。建立了解离的衰减曲线模型。在所描述的实验条件下,初级解离CH 2F 2 → CHF + HF之后是反应CHF + HF → CF 2 + H2。后一个反应的速率常数的实验值表明,它不进行加成-消除过程涉及CH 2F 2 * 中间体,如前所述。
The unimolecular dissociation of CH2F2leading to CF2+ H2, CHF + HF, or CHF2+ H is investigated by quantum-chemical calculations and unimolecular rate theory. Modeling of the rate constants is accompanied by shock wave experiments over the range of 1400–1800 K, monitoring the formation of CF2. It is shown that the energetically most favorable dissociation channel leading to CF2+ H2has a higher threshold energy than the energetically less favorable one leading to CHF + HF. Falloff curves of the dissociations are modeled. Under the conditions of the described experiments, the primary dissociation CH2F2→ CHF + HF is followed by the reaction CHF + HF → CF2+ H2. The experimental value of the rate constant for the latter reaction indicates that it does not proceed by an addition–elimination process involving CH2F2* intermediates, as assumed before.
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影响因子: 2.9
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