Highly active and water tolerant Pt/MFe2O4 (M = Co and Ni) catalysts for low temperature CO oxidation

Pt supported on CoFe2O4 and NiFe2O4 spinel oxides were much more active for low temperature CO oxidation compared to those supported on monometallic oxides (i.e. Co3O4, Fe2O3 and NiO). The Pt/CoFe2O4 catalyst gave the best performance, with a turnover frequency of 0.27 s-1 at 50 ?, which was three times as high as that on the Pt/Fe2O3. The interaction between Pt and the spinel oxide facilitated the activation of the oxygen species as evidenced by the H2 temperature programmed reduction results, and weakened the adsorption strength of CO on the Pt atoms as revealed by the in situ diffuse reflectance infrared Fourier transform spectroscopy results and kinetic investigation. These facts accounted for the enhanced reactivity. Moreover, the catalysts exhibited excellent water tolerance, which maintained activity even under 10 vol.% water vapor in the feed stock. Therefore, these catalysts are promising for practical applications.

Automated summary

Pt supported on CoFe2O4 and NiFe2O4 spinel oxides exhibited higher activity for low temperature CO oxidation compared to monometallic oxides. The interaction between Pt and the spinel oxide facilitated oxygen species activation and weakened CO adsorption strength on Pt atoms. These catalysts also showed excellent water tolerance, making them promising for practical applications.