Dual catalyst bed concept for ctalytic partial oxidation of methane to syntehsis gas

摘要

A system with two catalyst beds instead of one single metal ctalyst bed is proposed for catalytic partial oxidation of methane(CPOM) to synthesis gas.In this catalyst bed system,an irreducible stable oxdie,such as yttrium-stabilized zirconia (YSZ),s used in the first catalyst bed to obtain selective oxidation to syngas with significant highly exothermic deep oxidation occurring as well.This feature results in milder temperature profles in the reactor because less het is librated compared to initial deep oxdiation as,e.g.on metal catalysts.More improtantly,all oxygen is completely conseumed in teh oxide catalyst bed.theseocnd bed comprises a metal ctalyst,e.g.Co-based,metallic catalysts to oxygen at hightemperatures is prevented.Therefore catalyst deactivation via evaporation of precious metal oxides is circumvented.Finally,synthesis gas with an equilibrium composition(almost 100(percent)CO and H_2 yields) is produced.