Carbon monoxide production in photooxidation of organic molecules in the air

Hanst, Philip L.; Spence, John W.; Edney, Edward O.

doi:10.1016/0004-6981(80)90038-4

Cited by 57 publications

(19 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is necessary to know the kinetics of the reactions in more detail (i.e., the rate laws for the formation of intermediates and products) before the more likely models can be validated. Hanst et al (1980) argue that most of the oxidized intermediates in a terpene reaction would be expected to leave the vapor phase, either because of polymer formation or because the intermediate's vapor pressure is low enough for condensation to occur. Obviously, this would prevent further degradation of the molecule in the vapor state.…”

Section: Discussionmentioning

confidence: 99%

“…Additional products include alcohol, acid, and aldehyde derivatives, but none show cleavage of the 2-methyl group. Carbon monoxide, carbon dioxide, formaldehyde, acetaldehyde, formic acid, and peroxyacetylnitrate have been identified in a-pinene reactions (Gay and Arnts, 1977;Hanst et al, 1980), but it appears more likely from the mechanisms in Figures 3-5 that these low molecular weight gas-phase products were formed first by oxidation, then cleavage of the terminal carbon at the opposite end of the molecule from the 2-methyl group. If this is the formation mechanism for the smaller compounds, they would not be detected by the radiotracer technique described in this report.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of carbon balances for smog chamber terpene oxidation experiments using a 14C tracer technique

1985

View full text Add to dashboard Cite

In the last decade, numerous studies of monoterpene hydrocarbons in the presence of ozone and oxides of nitrogen have been completed. Although insights about the reactivity of terpenes have been gained, and several products have been identified in the gas and aerosol phases, carbon balances have been generally poor. This paper describes a radiotracer technique which accounts for carbon-containing compounds in a smog chamber at the conclusion of a photooxidation or ozonolysis reaction. Instead of attempting to identify individual products, gas-phase compounds were separated from aerosols, and each phase was analyzed by a liquid scintillation counter. A carbon balance of 79 to 97% was obtained with 14C-~-pinene and ozone using this technique. The significance of the results are discussed in terms of the l*C-a-pinene concentrations used in this study, which were lower than concentrations used previously by one to four orders of magnitude. In spite of the lower concentrations, the gaseous and aerosol fractions observed in the present investigation are comparable to those observed by others. Possible reaction products are discussed with respect to likely mechanisms for a-pinene oxidation.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Determination of carbon balances for smog chamber terpene oxidation experiments using a 14C tracer technique

1985

View full text Add to dashboard Cite

show abstract

“…The yield factor from terpenes is thought-to be smaller since some fraction of terpenes is converted to aerosols after oxidation. Based on experiments by Hanst et al ( 1980 ), Warneck (2000) estimates that 20% of carbon in terpenes is converted to CO and we adopt that figure here. From this, we calculated that 59 Tg y-1 of CO is produced from terpenes, and 78% of this is emitted in the tropics.…”

Section: Oxidation Of Natural Nmhcsmentioning

confidence: 99%

Investigation of the sources and sinks of atmospheric methane

Butenhoff¹

2000

View full text Add to dashboard Cite

Methane (CfLi) is a potent greenhouse gas and its atmospheric abundance has .nearly tripled since pre-industrial times. With a radiative forcing of 0.48 W m-2 it is second only to carbon dioxide in changing the radiative balance of the atmosphere. The behavior of CH.i has been interesting in recent years. After nearly a century of rapid growth fueled by anthropogenic emissions from sources such as agricultural production and energy, in the past two to three decades the trend of CRi has declined to nearly zero, and its growth today is stalled. There is much interest in understanding why and how CRi changes on decadal time scales, not only to explain past behavior but more importantly to predict where CRi is heading in the future. This has implications not only for future climate change, but also for mitigation policies that aim to reduce emissions of greenhouse gases.The work presented here represents a number of independent studies that investigated various components of the CHi budget, namely the sources and sinks. We The near-constant global burden of CfL seen today hides the changing behavior of the sources and sinks beneath .. Our findings will help us understand whether Cf4 levels will remain stable in the future.2

show abstract

“…Because these monoterpenes are unsaturated hydrocarbons, they are highly reactive towards ozone, OH, and the nitrate radical; as a result of these reactions, these hydrocarbons might affect the concentration of trace compounds in the atmosphere on a global scale [4]. These trace compounds can be divided into three categoriesvolatile compounds such as carbon monoxide and carbon dioxide [5,6,7], semi-volatile compounds such as formaldehyde, acetone [8,9], pinonaldehyde [6,9,10,11,12] and nopinone [6,10,11,12]. Monoterpenes are also known to be involved in the production of atmospheric aerosols [6,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

HPLC–MS determination of the oxidation products of the reaction between α- and β-pinene and OH radicals

et al. 2002

View full text Add to dashboard Cite

Biogenic non-methane hydrocarbons such as isoprene, alpha-pinene, and beta-pinene, are emitted by forests in very large quantities. To evaluate the role of alpha- and beta-pinene and their contribution to the global production of trace gases and especially aerosol precursors, a study of the oxidation mechanism of alpha- and beta-pinene with hydroxyl radicals must be conducted. The degradation products of both monoterpenes with hydroxyl radicals were identified and quantified in a fast-flow reactor. The products were collected on a liquid-nitrogen trap coated with a 2,4-DNPH solution to which two internal standards (benzaldehyde-2,4-DNPH and tolualdehyde-2,4-DNPH) had been added. The collection method was based on the in situ conversion of aldehyde and/or ketone compounds to their 2,4-dinitrophenylhydrazone derivatives. The derivatives were analyzed by HPLC-MS using APCI(-). TIC chromatograms and mass spectral data for the various oxidation products are presented. For alpha-pinene, pinonaldehyde is the most important degradation product, with smaller amounts of acetone, formaldehyde, campholenealdehyde, and acetaldehyde. For beta-pinene, nopinone and formaldehyde are the most abundant products, of almost equal importance, whereas acetone and acetaldehyde are minor compounds.

show abstract

Carbon monoxide production in photooxidation of organic molecules in the air

Cited by 57 publications

References 17 publications

Determination of carbon balances for smog chamber terpene oxidation experiments using a 14C tracer technique

Determination of carbon balances for smog chamber terpene oxidation experiments using a 14C tracer technique

Investigation of the sources and sinks of atmospheric methane

HPLC–MS determination of the oxidation products of the reaction between α- and β-pinene and OH radicals

Contact Info

Product

Resources

About