Catalytic combustion of premixed methane/air on a palladium-substituted hexaluminate stagnation surface

This paper is an experimental and modeling study of catalytic combustion of lean methane/air mixtures in stagnation flow over a strontium-palladium-substituted hexaluminate catalyst surface. It reports gas-phase profiles in the stagnation-flow boundary layer as measured by microprobe mass-spectrometric sampling. A chemically reacting flow model is developed and used to assist interpretation of the experimental data. A new surface-reaction mechanism does an excellent job of representing the effect of surface temperature (400 degreesC less than or equal to T-s less than or equal to 760 degreesC) and equivalence ratio (0.2 less than or equal to phi less than or equal to 0.8).