US 4,407,733 AGranted

Supported catalysts and process for their preparation

AssigneeBayer Aktiengesellschaft

InventorsUdo Birkenstock, Herbert Schmidt

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Abstract

A process for the preparation of a supported catalyst containing a catalytically active metal such as a noble metal is disclosed wherein the supported catalyst is prepared by initially contacting the inert support with a base and disposing an amount of base in the support corresponding to 0.01 to 50 gram equivalents of base per gram equivalent of catalytically active metal to be deposited thereon, drying the so-treated support to a residual moisture content of less than 10 percent of the maximum absorbency of the support and thereafter impregnating the same with a salt solution of a catalytically active metal, e.g., a salt of a catalytically active noble metal. The inert support is one having a BET surface area of less than 20 square meters per gram. The catalyst is useful in hydrogenation, dehydrogenation, hydrogenolysis, oxidation, polymerization, isomerization or cyclization reactions.

Claims27

Dependent claims

A supported catalyst comprising an inert support material having a BET surface area of less than 20 square meters per gram and a catalytically active material disposed in an annular zone located inside and just below the surface of said inert support prepared by a process consisting essentially of:

A. contacting said inert support, prior to any impregnation with the catalytically active metal in accordance with its absorbency to saturation, with a solution of a base so as to dispose within said inert support 0.01 to 50 grams equivalents of base per gram equivalent of catalytically active metal to be impregnated within said inert support;
B. drying the so-base-treated inert support at a temperature of 50.degree. to 200.degree. C. so that said inert support has a constant weight and has a residual moisture content of less than 10 percent of the maximum obsorbency of the support;
and
C. impregnating the so-dried inert material in accordance with its absorbency to saturation with a solution of a catalytically active metal;
and
D. washing, drying and reducing or calcining the so-impregnated inert material.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/284,752Filed 20 Jul 1981 · continuation
Priority: DE 284897811 Nov 1978
Granted: 4 Oct 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

C07C 209/36
By reduction of nitro groups: by reduction of nitro groups bound to carbon atoms of six-membered aromatic rings in presence of hydrogen-containing…
B01J 23/40
Of noble metals: of the platinum group metals
B01J 37/0201
Impregnation, coating or precipitation: impregnation
B01J 37/03
Impregnation, coating or precipitation: precipitation; Co-precipitation