Abstract
A series of vanadium–phosphorus oxides (mainly with V $$:$$ P $$ = 1:1 $$ ) supported on pigmentary anatase (10 m2 g-1) has been prepared using aqueous NH4VO3 and (NH4)H2PO4 solutions, with loadings up to 11.3 wt%, equivalent to about 12.7 monolayers. Characterisation by X-ray diffraction, laser Raman spectroscopy, X-ray photoelectron spectroscopy and temperature-programmed reduction suggests that the main phase present at loadings below about 10 wt% is an amorphous V–P oxide which exists chiefly as blocks of disordered material. The presence of small amounts of crystalline $$\beta $$ -VOPO4 and of V2O5 is indicated at the highest loadings, especially when $$1:3$$ and $$3:1$$ V $$:$$ P ratios are used. The two materials having the lowest loadings are active for methanol oxidation at 473–533 K, and show high selectivity to formaldehyde.
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