Rate constants and mechanism for reactions of ketenes with OH radicals in air at 299.+-.2K.
スポンサーリンク
概要
- 論文の詳細を見る
Rate constants for reactions of OH radicals with four kinds of simple ketenes (ketene, methylketene: MK, ethylketene: EK, and dimethylketene: DMK) were measured in 1 atm of air at 299±2 K by use of a competitive reaction method. The photolysis of CH<SUB>3</SUB>ONO in air was used to generate OH radicals. The rate constants for OH reactions obtained are (1.8±0.2)×10<SUP>−11</SUP>, (7.6±1.4)×10<SUP>−11</SUP>, (11±3)×10<SUP>−11</SUP> and (10±3)×10<SUP>−11</SUP> cm<SUP>3</SUP> molecule<SUP>−1</SUP> s<SUP>−1</SUP> for ketene, MK, EK, and DMK, respectively. The major product was a carbonyl compound; HCHO from ketene, CH<SUB>3</SUB>CHO from MK, and CH<SUB>3</SUB>COCH<SUB>3</SUB> from DMK; the yield was ≈80%, 72±17%, and 70±3%, respectively. It is proposed that the reaction proceeded mainly <I>via</I> an OH addition to the olefinic carbons of ketenes and the adduct decomposes to give a carbonyl compound and CO as final products in air.
- 公益社団法人 日本化学会の論文
著者
-
WASHIDA Nobuaki
Division of Atmospheric Environment, The National Institute for Environmental Studies
-
Honda Shigeo
Division of Atmospheric Environment, The National Institute for Environmental Studies
-
Hatakeyama Shiro
Division of Atmospheric Environment, The National Institute for Environmental Studies
-
Akimoto Hajime
Division of Atmospheric Environment, The National Institute for Environmental Studies
-
Akimoto Hajime
Division of Atmospheric Environment, National Institute for Environmental Studies
-
Hatakeyama Shiro
Division of Atmospheric Environment, National Institute for Environmental Studies
関連論文
- Experimental Studies of Ozone Depletion by Chlorofluorocarbons (CFC's), Bromofluorocarbons (BFC's), Hydrochlorofluorocarbons (HCFC's), and CH_3Br Using a 6-m^3 Photochemical Chamber
- UV and visible fluorescences of CF3 radicals produced by the two-photon decomposition of CF3Br and their radiative lifetimes.
- Reactions of ketene, methylketene, ethylketene, and dimethylketene with ozone in air.
- Rate constants and mechanism for reactions of ketenes with OH radicals in air at 299.+-.2K.
- Ring-cleavage reactions of aromatic hydrocarbons studied by FT-IR spectroscopy. II. Photooxidation of o-, m-, and p-xylenes in the NOx-air system.
- The reactions of hydrogen and deuterium atoms with four ketenes.
- Photlysis of ozonides in the gas phase.
- Ring-cleavage reactions of aromatic hydrocarbons studied by FT-IR spectroscopy. I. Photooxidation of toluene and benzene in the NOx-air system.
- Ring-cleavage reactions of aromatic hydrocarbons studied by FT-IR spectroscopy. III. Photooxidation of 1,2,3-, 1,2,4-, and 1,3,5-trimethylbenzenes in the NOx-air system.
- Reactions of ozone with 1-methylcyclohexene and methylenecyclohexane in air.