Combustion of CH4/H-2/Air Mixtures in Catalytic Microreactors

摘要

The combustion of CH4/H-2/HC mixtures in a very small space represents an alternative, innovative way to produce thermal/electrical energy Pd/NiCrO4 catalysts are lined on SiC monoliths via in situ solution combustion synthesis (SCS), and the monoliths are then tested by feeding CH4, H-2, and lean CH4/H-2 mixtures into a lab-scale test rig at an output thermal power of 7.6 MWth m(-3), in all cases, the combustion temperature shifts to values lower than those observed in non-catalytic combustion. When the power density is kept constant (by adding H-2 to the gas mixture), the value of CH4-T-50 (the half-conversion temperature of CH4) decreases relative to that of pure CH4, and the slope of the conversion curve becomes steeper. The higher the H-2 concentration is, the higher the reactivity of the mixture towards CH4 oxidation-probably due to a higher production of H-2 reactive radicals (OH).