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|a 19961073 (ISSN)
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|a An Ab Initio RRKM-Based Master Equation Study for Kinetics of OH-Initiated Oxidation of 2-Methyltetrahydrofuran and Its Implications in Kinetic Modeling
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|b MDPI
|c 2023
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|z View Fulltext in Publisher
|u https://doi.org/10.3390/en16093730
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|a Cyclic ethers (CEs) can be promising future biofuel candidates. Most CEs possess physico-chemical and combustion indicators comparable to conventional fuels, making them suitable for internal combustion engines. This work computationally investigates the kinetic behaviors of hydrogen abstraction from 2-methyl tetrahydrofuran (2MTHF), one of the promising CEs, by hydroxyl radicals under combustion and atmospheric relevant conditions. The various reaction pathways were explored using the CCSD(T)/cc-pVTZ//M06-2X/aug-cc-pVTZ level of theory. The Rice–Ramsperger–Kassel–Marcus-based master equation (RRKM-ME) rate model, including treatments for hindered internal rotation and tunneling, was employed to describe time-dependent species profiles and pressure and temperature-dependent rate coefficients. Our kinetic model revealed that the H-abstraction proceeds via an addition-elimination mechanism forming reaction complexes at both the entrance and exit channels. Eight different reaction channels yielding five radical products were located. The reaction exhibited complex kinetics yielding a U-shaped Arrhenius behavior. An unusual occurrence of negative temperature dependence was observed at low temperatures, owing to the negative barrier height for the hydrogen abstraction reaction from the C-H bond at the vicinity of the O-atom. A shift in the reaction mechanism was observed with the dominance of the abstraction at Cα-H of 2MTHF ring (causing negative-T dependence) and at CH3 (positive-T dependence) at low and high temperatures, respectively. Interestingly, the pressure effect was observed at low temperatures, revealing the kinetic significance of the pre-reaction complex. Under atmospheric pressure, our theoretical rate coefficients showed excellent agreement with the available literature data. Our model nicely captured the negative temperature-dependent behaviors at low temperatures. Our predicted global rate coefficients can be expressed as k (T, 760 Torr) = 3.55 × 101 × T−4.72 × exp [−340.0 K/T] + 8.21 × 10−23 × T3.49 × exp [918.8 K/T] (cm3/molecule/s). Our work provides a detailed kinetic picture of the OH-initiated oxidation kinetics of 2MTHF. Hence, this information is useful for building a kinetic me chanism for methylated cyclic ethers. © 2023 by the authors.
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|a 2-methyl tetrahydrofuran
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|a 2-methyltetrahydrofuran
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|a ab initio
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|a Ab initio
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|a Abstracting
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|a Atmospheric chemistry
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|a Atmospheric pressure
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|a Atmospheric temperature
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|a Combustion
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|a Cyclic ether
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|a Free radicals
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|a Hydrogen
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|a Indicators (chemical)
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|a kinetic modeling
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|a Kinetic models
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|a Kinetic theory
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|a Kinetics
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|a Lows-temperatures
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|a Master equations
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|a Nitrogen oxides
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|a OH -
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|a OH radical
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|a OH radicals
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|a Pressure effects
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|a Reaction kinetics
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|a Rice–ramsperge–kassel–marcu-based master equation calculation
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|a Rice-ramsperger-kassel-marcus
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|a RRKM-ME calculations
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|a Temperature distribution
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|a Bui, T.Q.
|e author
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|a Giri, B.R.
|e author
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|a Huynh, L.K.
|e author
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|a Mai, T.V.T.
|e author
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|a Mauss, F.
|e author
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|a Nhung, N.T.A.
|e author
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|a Quy, P.T.
|e author
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|a Shrestha, K.P.
|e author
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|t Energies
|x 19961073 (ISSN)
|g 16 9
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