Showing papers by "A. R. Ravishankara published in 2021"
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TL;DR: In this paper, rate coefficients for the reaction of NO 3 radicals with a series of aromatic aldehydes were measured in a 7300-L simulation chamber at ambient temperature and pressure by relative and absolute metrics.
Abstract: . Rate coefficients for the reaction of NO 3 radicals with a
series of aromatic aldehydes were measured in a 7300 L simulation
chamber at ambient temperature and pressure by relative and absolute
methods. The rate coefficients for benzaldehyde (BA), ortho-tolualdehyde
(O-TA), meta-tolualdehyde (M-TA), para-tolualdehyde (P-TA), 2,4-dimethyl
benzaldehyde (2,4-DMBA), 2,5-dimethyl benzaldehyde (2,5-DMBA) and
3,5-dimethyl benzaldehyde (3,5-DMBA) were k1= 2.6 ± 0.3,
k2= 8.7 ± 0.8, k3= 4.9 ± 0.5, k4= 4.9 ± 0.4, k5= 15.1 ± 1.3, k6= 12.8 ± 1.2 and
k7= 6.2 ± 0.6, respectively, in the units of 10 −15 cm 3 molec. −1 s −1 at 298 ± 2 K. The rate coefficient
k13 for the reaction of the NO 3 radical with deuterated
benzaldehyde (benzaldehyde-d 1) was found to be half that of k1 . The
end product of the reaction in an excess of NO 2 was measured to be
C 6 H 5 C(O)O 2 NO 2 . Theoretical calculations of aldehydic
bond energies and reaction pathways indicate that the NO 3 radical reacts
primarily with aromatic aldehydes through the abstraction of an aldehydic
hydrogen atom. The atmospheric implications of the measured rate
coefficients are briefly discussed.
5 citations