Catalyst and method for preparing phthalic anhydride

Details Catalyst and method for preparing phthalic anhydride Catalyst and method for preparing phthalic anhydride

2005-11-28

2009-11-17

Dentz, Bernard (Department: 1625)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C549S248000, C549S249000

Reexamination Certificate

active

07618918

ABSTRACT:
The present invention relates to a catalyst, in particular for the preparation of phthalic anhydride by gas phase oxidation of o-xylene and/or naphthalene, having an inert support and at least one layer which has been applied thereto and has a catalytically active composition comprising TiO2, characterized in that at least a portion of the TiO2used has the following properties: (a) the BET surface area is more than 15 m2/g, (b) the primary crystal size is more than 210 ångstrøm. Also described is a preferred process for preparing such a catalyst, and the preferred use of the titanium dioxide used in accordance with the invention.

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