High Pressure Catalytic Combustion of Methane Enriched Syngas

In this work, tests of catalytic combustion of CH4 enriched syngas are carried out at high pressure (up to 9 bar) over a 20wt%LaMnO3/La-?Al2O3 based monolith. The effect of methane and CO2 addition on the catalyst performances is studied at fixed values of the heating value, H2/CO ratio (1.5) and total flow rate. Results show that ignition is driven by CO combustion, which is the most reactive fuel over LaMnO3 catalyst. Methane substitution and CO2 addition lead to higher ignition pressure and higher quenching pressure thus reducing the operability window: However, by reducing the methane substitution (i.e. increasing the mixture reactivity), the detrimental effect of CO2 decreases. As a conclusion, the perovskyte catalyst can be successfully applied to burn gasification products even in the presence of significant CH4 and CO2 contents.