CO oxidation over titania-supported gold catalysts obtained using polyoxometalate

The present work is devoted to the development of a versatile method of Au/TiO 2 catalysts preparation using a polyoxometalate-based approach. It has been shown that the addition of polyoxometalates into an aqueous solution of Au 3+ hydroxocomplexes has an evident stabilizing effect. Due to specified preparation conditions, the choice of the polyoxometalates is quite limited. The most convenient for this purpose compounds are niobium- and tungsten-containing polyoxometalates. Depending on preparation conditions and textural properties of used TiO 2 , dispersion of deposited gold particles can be varied within a range of 1–50 nm. The catalytic activity of the prepared Au/TiO 2 catalysts is studied in a model reaction of CO oxidation. Besides the dispersion of Au particles, another key factor affecting the low-temperature activity of the Au/TiO 2 catalysts in the CO oxidation is a reduction stage in the preparation procedures. Replace of hydrogen with CO results in the formation of more active and stable nanoparticles. Graphic abstract