Surface for methane combustion: O(3P)+CH4→OH+CH3

doi:10.1088/1674-1056/ab90f5

Abstract Kinetic investigations including quasi-classical trajectory and canonical unified statistical theory method calculations are carried out on a potential energy surface for the hydrogen-abstraction reaction from methane by atom O(³P). The surface is constructed using a modified Shepard interpolation method. The ab initio calculations are performed at the CCSD(T) level. Taking account of the contribution of inner core electrons to electronic correlation interaction in ab initio electronic structure calculations, modified optimized aug-cc-pCVQZ basis sets are applied to the all-electrons calculations. On this potential energy surface, the triplet oxygen atom attacks methane in a near-collinear H-CH₃ direction to form a saddle point with barrier height of 13.55 kcal/mol, which plays a key role in the kinetics of the title reaction. For the temperature range of 298-2500 K, our calculated thermal rate constants for the O(³P)+CH₄→ OH+CH₃ reaction show good agreement with relevant experimental data. This work provides detailed mechanism of this gas-phase reaction and a theoretical guidance for methane combustion.

Keywords: methane combustion potential energy surface transition state kinetic ab initio electronic structure calculation

Received: 29 February 2020
Revised: 28 April 2020
Accepted manuscript online:

PACS:	34.10.+x	(General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.))
	31.15.xv	(Molecular dynamics and other numerical methods)
	34.50.Lf	(Chemical reactions)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51574016) and completed while the author was in residence at UNSW, Australia supported by the International Cooperation Training Program for Innovative Talents of USTB.

Corresponding Authors: Ya Peng, Zhong-An Jiang
E-mail: pengyaustb@sina.com;jza1963@263.net

Cite this article:

Ya Peng(彭亚), Zhong-An Jiang(蒋仲安), Ju-Shi Chen(陈举师) Surface for methane combustion: O(³P)+CH₄→OH+CH₃ 2020 Chin. Phys. B 29 073401

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Surface for methane combustion: O(3P)+CH4→OH+CH3

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Surface for methane combustion: O(³P)+CH₄→OH+CH₃