Mechanisms for formation of inorganic byproducts in plasma chemical processing of hazardous air pollutants
- National Inst. for Resources and Environment, Ibaraki (Japan)
- Osaka Prefecture Univ. (Japan). Dept. of Energy Systems Engineering
Plasma chemical behavior of hazardous air pollutants (HAP`s) (Cl{sub 2}C{double_bond}CCl{sub 2}, Cl{sub 2}C{double_bond}CHCl, Cl{sub 3}{single_bond}CH{sub 3}, Cl{sub 2}CH{single_bond}CH{sub 2}Cl, CH{sub 3}Cl, CH{sub 3}Br, and benzene), their molecular probes (CH{sub 4}, CH{sub 3}{single_bond}CH{sub 3}, and CH{sub 2}{double_bond}CH{sub 2}), and carbon oxides (CO{sub x}) was investigated with a ferroelectric packed-bed plasma reactor to obtain information on the formation of CO{sub x} and N{sub 2}O. It has been shown that the oxidation of CO to CO{sub 2} is a slow reaction in plasma, and that CO and CO{sub 2} mainly result from different precursors. Simultaneous achievement of complete oxidative decomposition of HAP`s in plasma and recovery of CO as a chemical feedstock could be favorable. The process of N{sub 2}O formation is affected by HAP structures and oxygen concentration. In the decomposition of olefinic HAP`s, such as Cl{sub 2}C{double_bond}CCl{sub 2} and Cl{sub 2}C{double_bond}CHCl, high-power short-residence-time operations are effective in suppressing N{sub 2}O formation. In the cases of CH{sub 3}Cl and CH{sub 3}Br, low specific energy density operations could be necessary to reduce N{sub 2}O concentrations. The yields and selectivities of CO, CO{sub 2}, and N{sub 2}O change drastically by adding only 2% of oxygen to N{sub 2}, and oxygen concentration is not a good factor to control these inorganic oxides.
- OSTI ID:
- 691422
- Journal Information:
- IEEE Transactions on Industry Applications, Journal Name: IEEE Transactions on Industry Applications Journal Issue: 4 Vol. 35; ISSN 0093-9994; ISSN ITIACR
- Country of Publication:
- United States
- Language:
- English
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