Quantum chemical and kinetic study of the reaction between CCl2 and NO2 radicals

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL
Nicolás Damián Gómez, María Paula Badenes, Maria Eugenia Tucceri, Carlos J Cobos
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引用次数: 0

Abstract

The dependence of the rate constant of the recombination reaction of CCl2 and NO2 radicals on temperature and pressure was studied. Quantum-chemical calculations were employed to characterize relevant aspects of the potential energy surface for this process. The limiting rate constants between 300 and 2000 K were analyzed using the unimolecular reactions theory. The resulting low pressure rate constant can be represented as k0 = [He] (1.4 ± 0.2) x 10-26 (T/300 K)(-8.72±0.04)exp(-(1520 ± 10) K/T) cm3 molecule-1 s-1. The corresponding expressions for the high pressure limit rate constants, derived from a simplified version of the statistical adiabatic channel (SSACM) and from a SACM combined with classical trajectory calculations (SACM/CT), are (2.3 ± 1.9) x 10-11 (T/300 K)(-1.01±0.39)exp(-(810 ± 80) K/T) and (8.8 ± 5.3) x 10-13 (T/300 K)(0.82±0.13) cm3 molecule-1 s-1. The falloff curves were represented in terms of these limiting rate constants. Reported experimental results are well described with the present model. Our calculations indicate that the CCl2 + NO2 reaction proceeds via the stabilization of the energized CCl2NO2 adduct, and that the CCl2 + NO2 → CCl2O + NO channel becomes relevant at high temperatures.
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来源期刊
Physical Chemistry Chemical Physics
Physical Chemistry Chemical Physics 化学-物理:原子、分子和化学物理
CiteScore
5.50
自引率
9.10%
发文量
2675
审稿时长
2.0 months
期刊介绍: Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.
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