FT–IR study of the ring-retaining products from the reaction of OH radicals with phenol, o-, m-, and p-cresol

Olariu, Romeo Iulian; Klotz, Björn; Barnes, Ian; Becker, K. H.; Mocanu, Raluca

doi:10.1016/s1352-2310(02)00202-9

Cited by 188 publications

(245 citation statements)

References 39 publications

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“…The main difference was that catechol totally reacted after a sunlight exposition of 1.5h, 380 confirming that catechol is much more reactive than phenol or benzene. These results agree with 381 the in-depth atmospheric degradation studies described by Olariu et al, 2002. …”

supporting

confidence: 84%

“…Other minority gases were glyoxal, maleic anhydride, 4-nitrophenol and 2-177 nitrophenol (0.1-20 ppbV). Some of these products have also been detected in the photo-178 oxidation of other aromatic hydrocarbons (Olariu et al, 2002). 179 A significant amount of aerosol was obtained under our experimental conditions -large 180 chamber, natural radiation and high precursor concentrations -, even in an atmosphere free of 181 seeds.…”

Section: Gas-phase Products and Aerosol Profiles 168mentioning

confidence: 76%

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Secondary organic aerosol formation from the photo-oxidation of benzene

Borrás

Tortajada-Genaro

2012

Atmospheric Environment

100

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supporting

confidence: 84%

Section: Gas-phase Products and Aerosol Profiles 168mentioning

confidence: 76%

Secondary organic aerosol formation from the photo-oxidation of benzene

Borrás

Tortajada-Genaro

2012

Atmospheric Environment

100

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“…Production of OH from C 6 -HPALD photolysis was quantified from the growth of DHB, which is produced from the reaction of OH with phenol at a yield of 80 AE 12%. 33 phenol…”

Section: Methodsmentioning

confidence: 99%

Photolysis, OH reactivity and ozone reactivity of a proxy for isoprene-derived hydroperoxyenals (HPALDs)

Wolfe

Crounse

Parrish

et al. 2012

Phys. Chem. Chem. Phys.

103

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The C 5 -hydroperoxyenals (C 5 -HPALDs) are a newly-recognized class of multi-functional hydrocarbons produced during the hydroxyl radical (OH)-initiated oxidation of isoprene. Recent theoretical calculations suggest that fast photolysis of these compounds may be an important OH source in high-isoprene, low-NO regions. We report experimental constraints for key parameters of photolysis, OH reaction and ozone reaction of these compounds as derived from a closelyrelated, custom-synthesized C 6 -HPALD. The photolysis quantum yield is 1.0 AE 0.4 over the range 300-400 nm, assuming an absorption cross section equal to the average of those measured for several analogous enals. The yield of OH from photolysis was determined as 1.0 AE 0.8. The OH reaction rate constant is (5.1 AE 1.8) Â 10 À11 cm 3 molecule À1 s À1 at 296 K. The ozone reaction rate constant is (1.2 AE 0.2) Â 10 À18 cm 3 molecule À1 s À1 at 296 K. These results are consistent with previous first-principles estimates, though the nature and fate of secondary oxidation products remains uncertain. Incorporation of C 5 -HPALD chemistry with the above parameters in a 0-D box model, along with experimentally-constrained rates for C 5 -HPALD production from isomerization of first-generation isoprene hydroxyperoxy radicals, is found to enhance modeled OH concentrations by 5-16% relative to the traditional isoprene oxidation mechanism for the chemical regimes of recent observational studies in rural and remote regions. This enhancement in OH will increase if C 5 -HPALD photo-oxidation products also photolyze to yield additional OH or if the C 5 -HPALD production rate is faster than has been observed.

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“…1 Atmospheric sources of nitrophenols include primary emissions from vehicles and secondary formation from tropospheric reactions of monoaromatic compounds with the hydroxyl radical, OH, in the presence of nitrogen oxides, or NO 3 -initiated oxidation of phenol and cresols. [2][3][4][5] Lately, nitrophenols in the gas phase have attracted attention as photolytic precursors of nitrous acid, HONO, [6][7] an important tropospheric species which readily photolyzes to form OH, the principal oxidant in the atmosphere. [8][9][10] Following this discovery, other ortho-nitroaromatics have been shown to photolyze to HONO or OH.…”

Section: Introductionmentioning

confidence: 99%

Near-Ultraviolet Absorption Cross Sections of Nitrophenols and Their Potential Influence on Tropospheric Oxidation Capacity

2011

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Access to the full text of the published version may require a subscription. HONO, but their gas-phase absorption has not previously been reported. In this study, the absorption cross-sections of 2-nitrophenol, 3-methyl-2-nitrophenol, and 4-methyl-2-nitrophenol were measured from 320 to 450 nm using incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS). RightsThe benzaldehyde absorption spectrum was measured to validate the approach and was in good agreement with literature spectra. The nitrophenol absorption cross-sections are large (ca. 10 -17 cm 2 molecule -1 ) and blue-shifted about 20 nm compared to previously measured solution spectra. Besides forming HONO, nitrophenol absorption influences other photochemistry by reducing the available actinic flux. The magnitudes of both effects are evaluated as a function of solar zenith angle, and nitrophenol absorption is shown to lower the photolysis rates of O 3 and NO 2 .

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FT–IR study of the ring-retaining products from the reaction of OH radicals with phenol, o-, m-, and p-cresol

Cited by 188 publications

References 39 publications

Secondary organic aerosol formation from the photo-oxidation of benzene

Secondary organic aerosol formation from the photo-oxidation of benzene

Photolysis, OH reactivity and ozone reactivity of a proxy for isoprene-derived hydroperoxyenals (HPALDs)

Near-Ultraviolet Absorption Cross Sections of Nitrophenols and Their Potential Influence on Tropospheric Oxidation Capacity

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