The mechanism of combustion of pentane in the gas phase between 250° and 400°C

Knox, John H.

doi:10.1016/s0082-0784(71)80025-5

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…This is in conflict with the recently published ab initio results that suggest that oxane formation (similar to the formation of four-and fivemembered ring formation) is substantially slower than the analogous epoxide formation reaction under thermal conditions, both for substituted and unsubstituted systems, due to the entropic cost associated with the loss of conformational freedom from the ring closure. 50 Though larger cyclic ether formation reactions are possible at the elevated temperatures encountered in combustion, 74,80,81 ab initio calculations suggest they are unlikely to be important under atmospheric conditions. Oxane formation therefore appears to be systematically overestimated in RMG.…”

Section: Resultsmentioning

confidence: 99%

Screening for New Pathways in Atmospheric Oxidation Chemistry with Automated Mechanism Generation

2021

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In the Earth’s atmosphere, reactive organic carbon undergoes oxidation via a highly complex, multigeneration process, with implications for air quality and climate. Decades of experimental and theoretical studies, primarily on the reactions of hydrocarbons, have led to a canonical understanding of how gas-phase oxidation of organic compounds takes place. Recent research has brought to light a number of examples where the presence of certain functional groups opens up reaction pathways for key radical intermediates, including alkyl radicals, alkoxy radicals, and peroxy radicals, that are substantially different from traditional oxidation mechanisms. These discoveries highlight the need for methods that systematically explore the chemistry of complex, functionalized molecules without being prohibitively expensive. In this work, automated reaction network generation is used as a screening tool for new pathways in atmospheric oxidation chemistry. The reaction mechanism generator (RMG) is used to generate reaction networks for the OH-initiated oxidation of 200 mono- and bifunctionally substituted n-pentanes. The resulting networks are then filtered to highlight the reactions of key radical intermediates that are fast enough to compete with traditional atmospheric removal processes as well as “uncanonical” processes which differ from traditionally accepted oxidation mechanisms. Several recently reported, uncanonical atmospheric mechanisms appear in the RMG dataset. These “proof of concept” results provide confidence in this approach as a tool in the search for overlooked atmospheric oxidation chemistry. Several previously unreported reaction types are also encountered in the dataset. The most potentially atmospherically important of these is a radical–carbonyl ring-closure reaction that produces a highly functionalized cyclic alkoxy radical. This pathway is proposed as a promising target for further study via experiments and more detailed theoretical calculations. The approach presented herein represents a new way to efficiently explore atmospheric chemical space and unearth overlooked reaction steps in atmospheric oxidation.

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Section: Resultsmentioning

confidence: 99%

Screening for New Pathways in Atmospheric Oxidation Chemistry with Automated Mechanism Generation

2021

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“…However, it is possible that systems do exist for which the formation of larger rings is competitive with O 2 addition under atmospheric conditions. At the elevated temperatures encountered during combustion, the formation of larger cyclic ethers has been observed both theoretically and experimentally to be competitive even for unsubstituted systems. ,, …”

Section: Related Mechanismsmentioning

confidence: 99%

Thermalized Epoxide Formation in the Atmosphere

et al. 2019

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“…as a biofuel additive used to enhance performance of diesel and gasoline engines, as well as for its environmental benefits (reduction of NO x , HC, and CO emissions) [3][4][5]. The low temperature oxidation of n-pentane has been studied for decades [6,7]. More recently, Bugler et al [8] carried out a theoretical study of pentane isomers oxidation.…”

Section: Introductionmentioning

confidence: 99%