| abstract |
The present invention relates to a catalyst for the formation of aldehydes, carboxylic acids and carboxylic acid anhydrides, in particular phthalic anhydride, from aromatic hydrocarbons by catalytic gas phase oxidation, wherein the active substance of the catalyst is selected from the group consisting of vanadium pentoxide, Titanium, more preferably anatase type titanium dioxide, and at least one silver of a predetermined element, preferably vanadium or molybdenum or tungsten or niobium or antimony, with a mixed element oxide or vanadium and a predetermined element, preferably bismuth or Molybdenum or tungsten or a vanadium mixed element oxide of antimony or niobium, wherein, during the preparation of the catalyst, at least one or more silver or vanadium mixed element oxides, at least one element selected from the group consisting of Use or more precursor compounds, in particular the at least one multi-core precursor compound as a raw material source. |