catalyst for gas phase catalytic oxidation of aromatic hydrocarbons forming aldehydes, carboxylic acids and / or carboxylic acid anhydrides, especially phthalic acid anhydride, as well as a method for the manufacture of such a catalyst

摘要

The invention relates to a catalyst for catalytic gas phase oxidation of aromatic hydrocarbons to form aldehydes, carboxylic acids and/or carboxylic acid hydrides, in particular phthalic acid anhydride. The active mass comprises vanadium oxide, preferably vanadium pentoxide, titanium dioxide, preferably in the anatas-modification, and at least one silver mixing element oxide with defined elements, preferably vanadium and/or molybdenum and/or tungsten and/or niobium and/or antimony, and/or a vanadium mixing element oxide with defined elements, preferably bismuth and/or molybdenum and/or tungsten and/or antimony and/or niobium. When producing the catalyst, in particular during the production of a catalyst suspension or a powder mixture necessary for coating a carrier, at least one silver and/or vanadium mixing element oxide and/or at least one precursor compound, in particular at least one multi-core precursor compound, of at least one silver and/or vanadium mixing element oxide is used as a raw material source.