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| NIRE Annual Report | 
| 1998 |
Oxidation of Dilute Benzene on a Plasma Reactor Packed with BaTiO3and Al2O3ExcitedEnvironmental Technology DivisionAtmospheric Environmental Protection Department |
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Objectives
It is known that the plasma reactor packed with ferroelectric materials decomposes the low concentration of benzene in air. However, this plasma technology has some problems for practical applications, i.e., low CO2 selectivity, low energy efficiency and so on. In this year, we carried out a plasma chemical reaction coupled with adsorption in order to solve these problems.
Results
A conventional packed-bed plasma reactor and an alumina (Al2O3)-hybrid plasma reactor are illustrated in Fig.1 (a) and (b), respectively. The Al2O3-hybrid reactor was packed with the mixture of porous Al2O3pellets and ferroelectric pellets (BaTiO3).
Fig. 2 shows the amount of COx formed and the product selectivity to CO2 on both the reactors as a function of input power. As can be seen from this Fig., it was found that the amount of COx formed on the Al2O3-hybrid reactor was larger than that on the conventional one. The concentration level at 11 W of input power exceeded the maximum value assuming the complete oxidation of gas phase benzene in the feed stream, suggesting that benzene adsorbed on porous Al2O3pellets was decomposed into COx as well as in gas phase. Furthermore, the product selectivity to CO2 on the Al2O3-hybrid reactor was larger than that on the conventional one.
Selected Publications
1) Methane Decomposition in Barium Titanate Packed-Bed Nonthermal Plasma Reactor, Plasma Chem. Plasma Process., 18, 363-373, 1998. 2) Decomposition of Benzene Using Non-Thermal Plasma Reactor Packed with Ferroelectric Pellet, Conf. Rec. of 1997 IEEE IAS Annual Meeting, 1975-1982, 1997.