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Atmospheric oxidation of tetrachloroethylene: An ab initio study

机译:四氯乙烯的大气氧化:从头算研究

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摘要

A number of experimental studies have been conducted to determine the atmospheric oxidation of tetrachloroethylene, many indicating phosgene as the major product. Although various mechanisms have been suggested, the mechanism of phosgene production is unclear. Additionally, confusion has arisen over the role chlorine atoms may play in the oxidation of tetrachloroethylene and the products produced. To clarify these points, this study presents a comprehensive computational study of both the hydroxyl radical and the chlorine atom initiated atmospheric oxidation mechanism of tetrachloroethylene. The energetics for the oxidation of tetrachloroethylene (C_2Cl_4) are computed using ab initio methods. Potential energy surfaces of the reaction pathways are determined from the computations. This study clarifies the involvement of the Cl-initiated reaction pathways in the oxidation of tetrachloroethylene. Results from this work suggest that the final products are primarily from the Cl-initiated oxidation and include: trichloroacetyl chloride [ClC(O)CCl _3], phosgene [C(O)Cl_2], and regeneration of the initiating chlorine atom.
机译:已经进行了许多实验研究以确定四氯乙烯在大气中的氧化,许多表明光气是主要产物。尽管已经提出了各种机制,但是光气产生的机制尚不清楚。另外,由于氯原子在四氯乙烯和所产生的产物的氧化中可能起的作用而引起混乱。为了阐明这些观点,本研究对羟基自由基和氯原子引发的四氯乙烯大气氧化机理进行了全面的计算研究。使用从头算方法计算四氯乙烯(C_2Cl_4)氧化的能量。根据计算确定反应路径的势能面。这项研究阐明了Cl引发的反应途径在四氯乙烯氧化中的参与。这项工作的结果表明,最终产物主要来自Cl引发的氧化反应,包括:三氯乙酰氯[ClC(O)CCl _3],光气[C(O)Cl_2]和引发氯原子的再生。

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