Ring-cleavage reactions of aromatic hydrocarbons studied by FT-IR spectroscopy. I. Photooxidation of toluene and benzene in the NOx-air system.

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概要

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• The products of the atmospheric photooxidation reactions of toluene and benzene were analyzed quantitatively using long-path FT–IR spectroscopy. Methylglyoxal (only in the case of toluene), glyoxal and maleic anhydride were observed as aromatic ring-cleavage products. In the toluene photooxidation, yields of methylglyoxal, glyoxal, and maleic anhydride were 14±4, 15±4, and 4.0±0.4% (mole/mole), respectively. The formation of small molecules, formaldehyde and formic acid, was observed. It is suggested that the precursor of the ring-cleavage reaction is OH–aromatics–O<SUB>2</SUB> adducts, and that the α-dicarbonyls and unsaturated γ-dicarbonyls are produced by ring cleavage after cyclization of the OH–aromatics–O<SUB>2</SUB> adduct. The observation of maleic anhydride is considered as an evidence of the aromatic ring cleavage into C<SUB>2</SUB> and C<SUB>4</SUB> fragments. The fraction of the ring cleavage process in the total reaction is 29 and 15–20% in the cases of toluene and benzene, respectively.

• 公益社団法人 日本化学会の論文

著者

• Bandow Hiroshi

  Division Of Atmospheric Environment The National Institute For Environmental Studies

• WASHIDA Nobuaki

  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

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