Investigation on the effect of water vapor on the catalytic combustion of methane on platinum

摘要

The effect of H2O on the catalytic combustion of CH4 on Pt was investigated experimentally and numerically. The ignition temperature obtained by measuring the exit temperature of the H2O/CH4/Air mixtures flow through Pt coated honeycomb channels showed that the ignition temperature was related to the CH4 and H2O mole fraction. The numerical results showed that the adsorption of H2O blocked CH4 oxidation, leading to the increase of the ignition temperature and the reforming reaction did not occur with C/O ratio less than 0.43. However, with C/O ratio increasing, H2O could produce catalytic reforming reaction with CH4, and H-2 produced in the reaction could increase the conversion of CH4. This study is helpful to provide some useful information for the design of the micro-combustor.