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Abstract:The NO x reduction activity on γ -alumina was significantly improved by discharging nonthermal plasma in a simulated oxidizing exhaust gas under conditions of a high space velocity. On the other hand, those on a Pt-loaded catalyst and Cu-ZSM-5 could not be improved. The discharging nonthermal plasma converted NO to NO 2 and hydrocarbons to partial-oxidized hydrocarbons, such as aldehydes, under the oxidizing conditions. From the relationship between the NO x reduction activities and the properties of several alumina catalysts, it was found that the NO x reduction activity was correlated with the number of acid sites on the alumina based on the NH 3 adsorption measurement. Therefore, it is concluded that the NO x reduction occurred at the acid sites of the alumina, and the discharging nonthermal plasma improves the NO x reduction activity by NO 2 formation and partial-oxidation of hydrocarbons. These results suggest that a catalytic reaction assisted by the discharging nonthermal plasma could be a promising technology for NO x reduction in lean-burn and diesel exhaust gases even under the conditions of high space velocity.

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