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

Paper ID Volume ID Publish Year Pages File Format Full-Text
50630 46805 2010 6 PDF Available
Title
The effect of phosphorous precursor on the CO oxidation activity of P-modified TiO2 supported Ag catalysts
Abstract

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.

Graphical abstractIncorporation 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 full-size imageDownload 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.

Keywords
P-modified TiO2; CO oxidation; Ag/TiO2; Phosphorous precursor
First Page Preview
The effect of phosphorous precursor on the CO oxidation activity of P-modified TiO2 supported Ag catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 11, Issue 15, 25 September 2010, Pages 1238–1243
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis