Oxidation of trichloroethene in stagnation flows over inert and catalytic heated ceramic surfaces

Abstract

Raman scattering was used to measure major species in a stagnation point flow over heated ceramic surfaces. The surfaces were either nominally inert, or were coated with a chromium oxide catalyst. The flow contained trichloroethene and auxiliary fuels, as well as oxygen and nitrogen. The temperature of the surfaces could be adjusted. Resonant Raman scattering was used to measure the trichloroethene in the vicinity of the stagnation point. Results were compared with a numerical model of the flow. The experiments and the modeling showed that methane was not an effective auxiliary fuel for surface temperatures up to about 1200 K. However, propane and dimethyl ether were much more effective. The numerical model was able to achieve good agreement with the measurements after a slight adjustment to the surface temperature that was used in the calculations. Catalytically coated surfaces indicated the action of surface reactions that were successfully predicted with a simple surface reaction model.