The effect of phosphorous precursor on the CO oxidation activity of P-modified TiO2 supported Ag catalysts

Nanocrystalline TiO2 and P-modified TiO2 with P/Ti atomic ratio 0.01 were prepared by the solvothermal method and employed as the supports for Ag/TiO2 catalysts for CO oxidation reaction. The incorporation of phosphorus into the TiO2 lattice in the form of Ti–O–P resulted in an increase of both surface area and metal dispersion. The P-modified TiO2 supported Ag catalysts using phosphorus precursor in the form of oxide promoted the weak adsorbed oxygen species and resulted in catalytic activity improvement in CO oxidation. However, the use of phosphorous precursor in the form of phosphate such as H3PO4, (NH4)2HPO4, (C2H5)3PO4 could result in the strongly adsorbed oxygen species and/or the bidentate of phosphate species blocking the active sites instead.

Incorporation of phosphorus into the TiO2 lattice in the form of Ti-O-P resulted in an increase of both surface area and metal dispersion. The P-modified TiO2 supported Ag catalysts using phosphorus precursor in the form of oxide promoted the weak adsorbed oxygen species and resulted in catalytic activity improvement in CO oxidation.Figure optionsDownload as PowerPoint slideResearch highlights
• The incorporation of phosphorus into the TiO2 lattice in the form of Ti–O–P resulted in an increase of both surface area and metal dispersion.
• The P-modified TiO2 supported Ag catalysts using phosphorus precursor in the form of oxide promoted the weak adsorbed oxygen species and resulted in catalytic activity improvement in CO oxidation.
• The use of phosphorous precursor in the form of phosphate could result in the strongly adsorbed oxygen species and/or the bidentate of phosphate species blocking the active sites instead.