Abstract
NO concentration measurement in the burnt gas from the catalytic combustion was carried out by using a laser-induced fluorescence method. A palladium catalyst supported on a cordierite honeycomb was used. The methance/air mixture, which was pre-heated to 530 K, was introduced into the catalyst honeycomb. To excite a NO molecule, an ArF excimer laser was used. Wavelength of the laser right was set at 193.375 nm. The laser sheet was introduced into the downstream of the honeycomb. In the case of a lean mixture, NO was observed after the honeycomb. On the other hand, in the case of a rich mixture, a blue flame at downstream from the honeycomb were observed, and NO was observed at the blue flame. In order to obtain the NO concentration from the NO fluorescence intensity, temperature dependency of the fluorescence intensity was investigated by using NO-N2 mixture. Axial concentration distributions of NO were derived from the NO fluorescence intensity distributions. Furthermore, change of the NO emission level with equivalence ratio was investigated at the outlet of the honeycomb.
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