Effects of sulfation on the activity of Ce0.67Zr0.33O2 supported Pt catalyst for propane oxidation

The sulfated Ce0.67Zr0.33O2 support was prepared by impregnated with sulfuric acid solution, and the influence of sulfation on propane oxidation activity of the corresponding Pt supported catalysts was evaluated. Sulfation of the ceria–zirconia mixed oxides inhibits its intrinsic activity severely but promoted the Pt supported catalysts significantly. It is evidenced by CO adsorption that the interaction between sulfates and platinum makes the latter in more deficient states (Ptδ+). These metastable Ptδ+ species are liable to the atmosphere and act as active sites for propane oxidation.

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► Sulfation of Ce0.67Zr0.33O2 enhances the propane oxidation activity of Pt catalyst.
► Electronegative sulfates alter metallic platinum to more deficient state (Ptδ+).
► These metastable Ptδ+ species are liable to atmosphere and act as the active sites.