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Kinetics and Mechanism of the NCCO + NO Reaction

机译:NCCO + NO反应的动力学和机理

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摘要

The kinetics of the NCCO + NO reaction was studied by diode infrared laser spectroscopy. The results show that the total rate coefficient of the reaction is highly pressure dependent, with k1 (298 K) = (3.2 ± 0.5 to 27.1 ± 2.0) × 10~(?13) cm~3 molecule~(?1) s~(?1) over the total pressure range 3?25 Torr. Only very small yields of CO2 and CO products were detected, with upper limits on branching ratios estimated at Φ (CO_2 + NCN) ≤ 0.01, Φ (2NCO) ≤~2 0.01, and Φ(CO + NCNO) ≤ 0.06. The reaction mechanism was investigated by calculating the potential energy surface (PES) using ab initio methods at the DFT-B3LYP/6-311++G**//CCSD(T)/6-311++G** level. The PES shows that pathways leading to bimolecular/trimolecular product channels involve high barriers. Both experiment and theory therefore indicate that the major pathway is formation and collisional stabilization of an NCC(NO)O adduct.
机译:通过二极管红外激光光谱研究了NCCO + NO反应的动力学。结果表明,反应的总速率系数与压力有关,k1(298 K)=(3.2±0.5至27.1±2.0)×10〜(?13)cm〜3分子〜(?1)s〜 (?1)在总压力范围3?25 Torr上。仅检测到非常少量的CO2和CO产物,支化率的上限估计为Φ(CO_2 + NCN)≤0.01,Φ(2NCO)≤〜2 0.01和Φ(CO + NCNO)≤0.06。通过从头算方法计算DFT-B3LYP / 6-311 ++ G ** // CCSD(T)/ 6-311 ++ G **的势能面(PES),研究了反应机理。 PES显示导致双分子/三分子产物通道的途径涉及高障碍。因此,实验和理论均表明,主要途径是NCC(NO)O加合物的形成和碰撞稳定。

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