Effect of the composition and structural and size characteristics of composites based on stabilized zirconia and transition metal (Cu, Co, Ni) oxides on their catalytic properties in methane oxidation reactions

The effects of transition metal (Cu, Co, Ni) oxides and platinum-group metals (Pt, Pd, Rh) in composites based on Y(Sc)-stabilized zirconia on their catalytic properties (activity, selectivity, sulfur resistance) and service life characteristics (thermal stability, performance stability) in methane oxidation reactions have been investigated. The high activity of the composites (75-99% methane conversion at 600-800A degrees C) correlates with the amount and mobility of surface oxygen in these materials. The promoting effect of the platinum-group metals depends on the composition of the reaction medium (on whether it corresponds to the partial or total methane oxidation and on whether it contains sulfur dioxide).