Abstract
The single and combined effect of operating parameters, as water and oxygen concentration, temperature and contact time on the catalytic activity of a VPO catalyst in the oxidation of propane and propylene to acrylic acid has been investigated in a fixed bed reactor. The results indicate that acrylic acid is formed by propylene produced by propane dehydrogenation and that carbon oxides are mainly produced by hydrocarbons oxidation up to 400 °C, acrylic acid oxidation becoming significant only at higher temperatures. Water concentrations >7.5% provide a strong increase of selectivity to acrylic acid at each value of the other operating parameters investigated. Acrylic acid yields can be improved, up to 400 °C, by increasing contact time due to the enhancement of propane conversion coupled with quite constant acrylic acid selectivity.
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