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AssigneeBASF SE
InventorsThomas Heidemann, Frank Rosowski, Gerd Linden, Michael Seufert, Gerhard Hefele, Peter Michael Lorz
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The invention relates to a method for producing shell catalysts for the catalytic vapor-phase oxidation of aromatic carboxylic acids and/or carboxylic acid anhydrides comprised of a supporting core and of catalytically active metal oxides which are deposited in a shell-shaped manner on said supporting core. The inventive catalysts are obtained by spraying an aqueous active mass suspension, said suspension containing the active metal oxides, at higher temperatures onto the hot supporting material which has a temperature ranging from 50 to 450° C. The aqueous active mass suspension contains 1 to 10 wt. %, with regard to the solid content of the active mass suspension, a binding agent comprised of A) a polymerizate obtained by radical polymerization, containing 5 to 100 wt. % of monomers (a) in the form of ethylenically unsaturated acid anhydrides or ethylenically unsaturated dicarboxylic acids whose carboxyl groups can form an anhydride and containing 0 to 95 wt. % monoethylenically unsaturated monomers (b) with the provision that the monomers (a) and (b) comprise, on average, a maximum of 6 carbon atoms which are not functionalized with groups containing oxygen, and of B) an alkanolamine having at least 2 OH groups, a maximum of 2 nitrogen atoms and a maximum of 8 C-atoms, whereby the weight ratio A:B ranges from 1:0.05 to 1:1.
A process for the preparation of coated catalysts for the catalytic gas phase oxidation of aromatic hydrocarbons to a member selected from carboxylic acids and anhydrides, said catalysts consisting essentially of a carrier core and catalytically active metal oxides applied thereto in layer form, which process comprises spraying an aqueous active material suspension containing the active metal oxides at relatively high temperatures onto the carrier core material at 50 to 450° C., wherein the aqueous active material suspension contains 1 to 10% by weight, based on solids content of the active material suspension, of a binder, consisting essentially of
A coated catalyst for the catalytic gas-phase oxidation of aromatic hydrocarbons to a member selected from carboxylic acids and carboxylic anhydrides, consisting essentially of an essentially inert carrier core of quartz, porcelain, magnesium oxide, silicon carbide, tin oxide, rutile, alumina, aluminum silicate, magnesium silicate, zirconium silicate or cerium silicate or mixtures thereof and a layer of catalytically active metal oxides applied the carrier core in amounts from 5 to 20% by weight, based on the amount of the carrier, in shell form comprising as essential constituents titanium oxide of the anatase type and vanadium pentoxide as well as a binder consists essentially of
Dependencies are inferred from the claim text.