Effects of temperature and pressure on alkyl nitrate yields in the NO/sub x/ photooxidations of n-pentane and n-heptane
The yields of alkyl nitrates formed in the NO/sub x/ photooxidations of n-pentane and n-heptane have been determined as a function of temperature (284-341 K) and pressure (56-740 torr). Alkyl peroxy radicals were produced by reaction of the n-alkanes with OH radicals generated from the photolysis of methyl nitrite in air or O/sub 2/. The alkyl nitrate yields were observed to be markedly temperature and pressure dependent, increasing with increasing pressure and decreasing temperature. These yields reflect the fraction of RO/sub 2/ radicals which react with NO to yield alkyl nitrates, and are thus important inputs into chemical computer models of the atmospheric NO/sub x/ photooxidations of the n-alkanes. The observed effects of pressure and temperature on the alkyl nitrate yields are discussed in terms of the mechanistic and thermochemical details of the RO/sub 2/ + NO reaction system, and a general empirical formula giving the alkyl nitrate yields for the C/sub 3/ through C/sub 8/ n-alkanes as a function of temperature and prssure is derived.
- Research Organization:
- Univ. of California, Riverside
- OSTI ID:
- 6856492
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 87:11; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Explicit photochemical mechanism for atmospheric oxidation of n-butane
Wavelength-dependent photolysis of i-pentanal and t-pentanal from 280 to 330 nm
Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ESTERS
HEPTANE
HYDROCARBONS
NITRATES
NITRIC ACID ESTERS
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXIDIZERS
OXYGEN COMPOUNDS
PENTANE
PEROXY RADICALS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PRESSURE DEPENDENCE
RADICALS
TEMPERATURE EFFECTS