| abstract |
Catalyst based on V2O5 and anatase contains anatase with specific surface area (BET) of 10-30 m2/g. This catalyst is used in gas phase oxidation of aromatic and unsaturated aliphatic hydrocarbons with air to (di)carboxylic acids/anhydrides, esp. in manufacture of maleic anhydride from benzene or butadiene/n-butene mixture, phthalic anhydride from naphthalene or o-xylene or pyromellitic acid from durene. Selectivity of catalyst is independent of temp. Active catalyst material pref. comprises 1-40, esp. 1-15 wt.% V2O5, rest anatase, and is gen. used with carrier of low porosity, to give 0.05-3 wt.% V2O5 content. |