High pressure methane catalytic combustion over novel partially coated LaMnO3-based monoliths

This work is focused on the experimental validation of a novel partially coated "core-shell" monolith configuration proposed for high pressure (up to 10 bar) methane combustion under self-sustained conditions. In particular, perovskite-based catalyst is deposited onto the walls of the outer channels, core zone being uncoated. The effect of pressure on ignition and quenching is studied for two partially coated monoliths with different coating degree, while a fully coated monolith is used as reference. Results show that coating only the external channels is an effective strategy to activate homogeneous reaction in the whole monolith. Moreover, independently from coating degree, ignition pressure, fuel conversion and flow rate a single value for developed thermal power is obtained at ignition conditions. This result suggests that ignition occurrence is related more to global rather than to local heat balance. (C) 2014 Elsevier B.V. All rights reserved.