Degussa Aktiengesellschaft

The British Petroleum Company, P.l.c.

Bertrand Despeyroux

Klaus Deller

Helmfried Krause

Roland Burmeister

Erik Peldszus

Peter Panster

Stefan Wieland

David J Smith

Howard Alper

Peter Albers

Hans Moesinger

James B Woell

Hatte Christine

Peter Schuetz

Beate Kleinwaechter

Jochen Simon

Karin Bartels

Shaped, activated Raney metal fixed-bed catalysts are obtained by molding a powder of at least one catalyst alloy, comprising at least one Raney process metal as catalytically active component and a leachable alloy component, and a powder of pure Raney process metal as binder with the addition of a shaping aid and pore-producer and subsequent calcination at temperatures below 850.degree. C. During calcination the shaping aid and pore-producer are burned away. Catalyst alloy powder and binder powder thereby sinter together to give a mechanically stable and porous molded item. This molded item thus consists of particles of catalyst alloys which are bonded by the powder of pure Raney process metal. It has no catalytically inactive, ceramic or glassy binder. The surface layer of the molded item is activated by leaching the leachable alloy component contained in the catalyst alloys with caustic soda solution.

Catalyst precursor for an activated raney metal fixed-bed catalyst, an

A modified supported noble metal catalyst is disclosed for the selective hydrogenation of aromatic halonitro compounds to form aromatic haloamines. The support consists of active carbon. The active component is platinum modified with copper. The new catalyst is distinguished by good selectivity and a high yield.

Catalyst for the selective hydrogenation of aromatic halonitro compounds

A process for uniform and reproducible impregnation of fixed bed catalyst supports in the form of loose particles with a desired shell volume, by applying atomized impregnating solutions of precursors of the catalytically active components onto the heap of catalyst supports circulated in a tank. By suitable selection of the spraying parameters, in particular the droplet size range, the quantity of solvent and the quantity of impregnating solution sprayed per rotation of the tank, the catalyst supports may be provided with shells with an excellent degree of uniformity.

Process for uniform and reproducible shell impregnation of fixed bed

A sulphidized catalyst which contains platinum on activated carbon is described. The activity of the catalyst can be greatly improved, while retaining the same selectivity, when the platinum-containing impregnation solution contains an oxidizing agent.

Sulphidized catalyst which contains platinum on activated carbon

A process is described for preparing hydrogenation catalysts which contain noble metals, having at least one catalytically active component and optionally promoters and/or modifiers on a support consisting of activated carbon washed with nitric acid. The activated carbon is subjected to an oxidative pretreatment with an oxidizing agent before applying the catalytically active components, promoters and modifiers.

Process for preparing hydrogenation catalysts which contain noble metals

A catalyst containing platinum on carbon as carrier for the catalytic oxidation of glyoxal to glyoxalic acid. Activity and selectivity of the catalyst can be considerably improved by modification with molybdenum and/or cerium.

Catalyst for the production of a glyoxylic acid by catalytic oxidation

Pressed parts based on pyrogenically produced titanium dioxide with the following physico-chemical characteristics:

Shaped articles based on pyrogenically produced titanium dioxide

Metal-containing, shaped, polymeric, tertiary and/or secondary organosiloxane amine compounds are introduced which contain the metals Pd, Pt, Ru, Rh individually or in combination as well as optional promotors and/or moderators. The organosiloxane amine functioning as carrier for the metals contains the units ##STR1## and/or units ##STR2## in which R.sup.1 to R.sup.5 are a group ##STR3## with R.sup.6 as a double-bonded group bound to N and Si (e.g. an alkylene group) and X is an amine group such as The carrier substance can be cross-linked with cross-linking agents containing Si, Ti, Zr or Al. The metal-containing product is spherical in form and is defined by the parameters of sphere diameter, specific surface and pore volume as well as bulk density. A method of production is disclosed which can be carried out in several variants as well as the use of the metal-containing product as catalyst for hydrogenation reactions and oxidation reactions.

Metal-containing, shaped polymeric, tertiary and/or secondary

Shaped articles based on pyrogenically produced titanium dioxide, method

A process for making gluconic acid and its alkali metal salts by oxidizing glucose with oxygen or oxygen containing gas in an aqueous alkaline solution in the presence of an activated charcoal supported catalyst containing a platinum group metal component, e.g. platinum and palladium and bismuth wherein the platinum, palladium and bismuth are simultaneously deposited on the charcoal support.

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Hanau, Germany

Bertrand Despeyroux