Abstract
Abstract γ-Alumina modified with phosphoric acid is used as a carrier to disperse and stabilise the active vanadia phase. Compared to conventional vanadia/γ-alumina catalysts, these catalysts showed high V 2 O 5 dispersion even at a loading as high as 20 wt.-% V 2 O 5 revealed by low-temperature oxygen chemisorption (LTOC) and X-ray diffraction (XRD) data. Ammonia chemisorption at 150°C was used to determine the acidity of vanadia catalysts supported on phosphate modified alumina. Electron spin resonance spectra of the reduced catalysts further confirmed the findings of LTOC and XRD. Ammonia uptake is correlated with the activity for the partial oxidation of methanol and the oxygen chemisorption data with selectivity for formaldehyde. Phosphorus addition in the form of phosphate acts as a promoter causing a beneficial effect in substantially improving the selectivity to formaldehyde.
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