Effect of Pt incorporation in LaBO3 (B = Mn, Fe, Co) perovskites on water gas shift activity

• Pt has been stabilised in ionic form in perovskite LaBO3 (B = Co and Fe).
• Pt doped LaCoO3 and LaFeO3 have shown good WGS activity.
• Methanation occurs on LaPtxCo1−xO3−δ and Fe counterpart prefers WGS.
• Cationic Pt is found to be active for WGS reaction.

Pt incorporated perovskites LaBO3 (B = Mn, Co, Fe) were synthesised and characterised to understand the charge state of Pt in these materials. At the temperature range used in this study, Pt could be stabilised in ionic form in Co and Fe perovskites but not in LaMnO3. Consequent to incorporation of Pt in +2 and +4 oxidation states, reduction in B site ion charge state occurred, enhancing oxygen vacancies. Pt doped Co and Fe perovskites showed high activity for CO conversion under water gas shift conditions but the activity characteristics were found to be different for the two catalysts; LaCo1−xPtxO3−δ showed methanation whereas the Fe counterpart was active in water gas shift reaction. It was also observed that methanation could be decreased and water gas shift enhanced in case of Pt doped Co perovskite when compared to Pt impregnated perovskite or mixed oxides.

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