Naphthalene and acenaphthene decomposition by electron beam generated plasma application

電子ビームプラズマ応用によるナフタレン及びアセナフテンの分解

Ostapczuk, A.*; 箱田 照幸; 島田 明彦; 小嶋 拓治

Ostapczuk, A.*; Hakoda, Teruyuki; Shimada, Akihiko; Kojima, Takuji

石炭火力発電所からの排ガス中に含まれる典型的な多環芳香族有機物として、ナフタレンやアセナフテンの電子ビームプラズマによる分解挙動を調べた。その結果、ナフタレン及びアセナフテンの分解のG値はそれぞれ1.66及び3.72であり、分解生成物としてはCOやCOに加えてベンゼン環を1個有する芳香族有機物が生じることを明らかにした。

The application of non-thermal plasma generated by electron beam (EB) was investigated in laboratory scale to study decomposition of polycyclic aromatic hydrocarbons like naphthalene and acenaphthene in flue gas. PAH compounds were treated by EB with the dose up to 8 kGy in dry and humid base gas mixtures. Experimentally established G-values gained 1.66 and 3.72 mol/100 eV for NL and AC at the dose of 1 kGy. NL and AC removal was observed in dry base gas mixtures showing that the reaction with OH radical is not exclusive pathway to initialize PAH decomposition, however in the presence of water remarkably higher decomposition efficiency was observed. As by-products of NL decomposition were identified compounds containing one aromatic ring and oxygen atoms besides CO and CO. It led to the conclusion that PAH decomposition process in humid flue gas can be regarded as multi-step oxidative de-aromatization analogical to its atmospheric chemistry.