Formation of furan along with HO2 during the OH-initiated oxidation of 2,5-DHF and 2,3-DHF: An experimental and computational study

Hariprasad D. Alwe, Asmita Sharma, Mohini P. Walavalkar, Suresh Dhanya, Prakash D. Naik

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Abstract

Experimental characterization of products during OH-initiated oxidation of dihydrofurans (DHF) confirms the formation of furan accompanied by the formation of HO2 to be a significant channel in 2,5-DHF (21 ± 3%), whereas it is absent in 2,3-DHF. Theoretical investigations on the reaction of OH with these molecules are carried out to understand this difference. All possible channels of reaction are studied at M06-2X level with 6-311G∗ basis set, and the stationary points on the potential energy surface are optimized. The overall rate coefficients calculated using conventional TST with Wigner tunneling correction for 2,5-DHF and 2,3-DHF are 2.25 × 10-11 and 4.13 × 10-10 cm3 molecule-1 s-1, respectively, in the same range as the previously determined experimental values. The branching ratios of different channels were estimated using the computed rate coefficients. The abstraction of H atom, leading to dihydrofuranyl radical, is found to be a significant probability, equally important as the addition of OH to the double bond in the case of 2,5-DHF. However, this probability is very small in the case of 2,3-DHF because the rate coefficient of the addition reaction is more than 10 times that of the abstraction reaction. This explains the conspicuous absence of furan among the products of the reaction of OH with 2,3-DHF. The calculations also indicate that the abstraction reaction, and hence furan formation, may become significant for OH-initiated oxidation of 2,3-DHF at temperatures relevant to combustion.

Original languageEnglish (US)
Pages (from-to)2793-2801
Number of pages9
JournalJournal of Physical Chemistry A
Volume119
Issue number12
DOIs
StatePublished - Mar 26 2015

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