Water gas shift reaction studies on 2% Pd/AMn1−xFexO3 (A = Ba, La, Pr; x = 0.4, 0.6) perovskites

BaMn0.6Fe0.4O3, BaMn0.4Fe0.6O3, LaMn0.6Fe0.4O3, LaMn0.4Fe0.6O3, PrMn0.6Fe0.4O3, and PrMn0.4Fe0.6O3 perovskites were synthesized via malic acid complexation and impregnated with 2% of palladium by dry-wet method. WGSR measurements were carried out in a stainless steel continuous flow reactor. The A-site metal increased the conversion of H2 and CO2 in the order Ba < La < Pr. Comparison of the B-site metal combinations showed higher conversions for Mn0.4Fe0.6 than Mn0.6Fe0.4. The formation of carbonaceous surface species was observed. In measurements with a gas chromatograph, the oxidation of surface palladium was found to decrease in the order La > Pr > Ba. No correlation was observed between WGSR activity and oxidation of palladium.