The influence of water on the selective oxidation of acrolein to acrylic acid on Mo/V/W-mixed oxides

The influence of water on the selective gas phase oxidation of acrolein to acrylic acid on Mo/V/W-mixed oxides was investigated by means of temperature-programmed experiments. In the presence of water, the rate of the acrylic acid formation is significantly pronounced. Selectivity- and yield-maxima are broadened and shifted towards lower temperatures. Nonetheless, the combustion remains unaffected. Furthermore, the catalysts stability remains likewise unaffected within the range of the experiments.

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► Spray dried Mo-V-W-mixed oxides are good model catalysts in the oxidation of acrolein.
► Additional water in the feed enhances the catalyst’s performance dramatically.
► Water increases the selectivity and shifts the maximum to a lower temperature.
► The total oxidation and the catalysts stability remain unaffected.
► Water may generate additional oxidation-sites active in the temperature range around 250–400 °C.