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Rate Coefficients for the Gas‐Phase Reaction of Ozone with C5 and C6 Unsaturated Aldehydes
Author(s) -
Kalalian C.,
Roth E.,
Chakir A.
Publication year - 2018
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.21139
Subject(s) - chemistry , arrhenius equation , ozone , reaction rate constant , gas phase , work (physics) , kinetics , molecule , fourier transform infrared spectroscopy , atmosphere (unit) , thermodynamics , computational chemistry , analytical chemistry (journal) , organic chemistry , activation energy , chemical engineering , physics , quantum mechanics , engineering
Emissions of biogenic volatile organic compounds are higher than those from anthropogenic sources. In this work, we studied the kinetics of the reaction of three unsaturated aldehydes (trans‐2‐pentenal, trans‐2‐hexenal, and 2‐methyl‐2‐pentenal) with ozone in a rigid atmospheric simulation chamber coupled to an FTIR spectrometer at four different temperatures (273, 298, 333, and 353 K). Reaction rate constants (× 10 −18 cm 3 molecule −1 s −1 ) at 298 K are 1.24 ± 0.06 for trans‐2‐pentenal (t‐2P), 1.37 ± 0.03 for trans‐2‐hexenal (t‐2H), and 1.58 ± 0.20) for 2‐methyl‐2‐pentenal (2M2P). The following Arrhenius expressions were deduced (cm 3 molecule −1 s −1 ):Trans-2-pentenal :k t − 2 P + O3= 1.38 ± 0.73 × 10 − 16 exp − 1406 ± 163/ TTrans-2-hexenal :k t − 2 H + O3= 1.79 ± 0.54 × 10 − 16 exp − 1457 ± 90/ T2-Methyl-2-pentenal :k 2 M 2 P + O3= 1.42 ± 0.56 × 10 − 17 exp − 664 ± 124/ TThe obtained data are presented and compared to those reported in the literature at room temperature, as well as to homologous alkenes. The atmospheric lifetimes with respect to ozone, derived from this study, are estimated to vary between 7 and 10 days.