Patent ID: 8097558
Filing Date: 2012-01-17
Classification: B01J

Abstract:
1. A catalyst for the preparation of phthalic anhydride by gas phase oxidation of o-xylene or naphthalene, having an inert support and at least one layer which has been applied thereto which has a catalytically active composition comprising TiO 2 , characterized in that at least a portion of the TiO 2 used has the following properties: (a) a BET surface area of more than 15 m 2 /g, (b) at least 25% of the total pore volume is formed by pores having a radius between 60 and 400 nm, and (c) a primary crystal size of more than 22 ångstrøm, wherein the D 90 value of the TiO 2 is between about 0.5 and 20 μm.