Degussa Aktiengesellschaft

Degussa - Huls Ag

E.i. Dupont De Nemours and Company

Andreas Freund

Thomas Haas

Thomas Tacke

Monika Berweiler

Dietrich Arntz

Thomas Lehmann

Robert Schwarz

Peter Panster

Karl-Anton Starz

Reinhold Brand

Rudolf Vanheertum

Daniel Ostgard

Emmanuel Auer

Christoph Brossmer

Jorg Sauer

Gerhard Heinz

Walther Girke

Martin Meier

Mario Scholz

Helmfried Krause

Bernd Kempf

Werner Burkhardt

Bruno Keller

Roland Burmeister

Heike Riedemann

J&ouml;rg Sauer

Johannes Ohmer

Udo Stenke

Hans Lansink-Rotgerink

Martin Bankmann

Rolf Hartung

Barbara Bender

Michael Gross

Dahai Yu

Matthias Höpp

Dietrich Michelchen

Jutta Lang

Jörg Sauer

Guenther Kunz

H G Lansink-Rotgerink

Raney copper which is doped with at least one metal from the group comprising iron and/or noble metals is used as a catalyst in the dehydrogenation of alcohols.

Raney copper

A shaped metal fixed-bed catalyst is disclosed which contains at least one catalyst alloy formed of a catalyst metal and an extractable alloying component. The catalyst is activated in an outer layer with a thickness of 0.1 to 2.0 mm starting from the surface by complete or partial extraction of the extractable alloying component. The catalyst may also contain promoters. The catalyst is distinguished from known catalyst in that it is formed exclusively of the catalyst alloy and has a total pore volume of 0.1 to 0.6 ml/g. The catalyst is used for hydrogenation, dehydrogenation and hydrogenolysis reactions.

Shaped metal fixed-bed catalyst, a process for its preparation and its use

A multimetallic catalyst for hydrogenation of substituted nitroaromatic compounds to give the corresponding aromatic amines. By doping iridium with at least one element from the group manganese, cobalt, iron, nickel, copper and ruthenium, a catalyst is obtained which is characterized by high selectivity.

Multimetallic catalyst and process for preparing substituted aromatic amines

A shaped, activated metal, fixed-bed catalyst with a pore volume of 0.05 to 1 ml/g and an outer activated layer consisting of a sintered, finely-divided, catalyst alloy and optionally promoters. The catalyst alloy has metallurgical phase domains, resulting from the method of preparation of the alloy, in which the largest phase by volume has a specific interface density of more than 0.5 &mgr;m,.

Shaped, activated metal, fixed-bed catalyst

A process for the production of 1,3-propanediol by heterogeneously catalyzed hydrogenation of 3-hydroxypropionaldehyde in an aqueous solution at 30 to 180&deg; C., at a hydrogenation pressure of 5 to 300 bar and a pH value of 2.5 to 7.0, wherein ruthenium on an oxide support is used as the catalyst.

Process for the production of 1,3-propanediol by hydrogenating 3-hydroxypropionaldehyde

A platinum supported catalyst is disclosed for the anode in a PEM fuel cell with high resistance to poisoning by carbon monoxide. The catalyst contains the noble metals platinum and ruthenium on a finely divided, conductive support material. The two noble metals are not alloyed with each other and are present in highly dispersed form on the support material, wherein the crystallite size of the platinum is less than 2 nm and that of the ruthenium is less than 1 nm.

Co-tolerant anode catalyst for PEM fuel cells and a process for its

The use of modified silicon dioxide as a catalyst support in catalytic reactions under hydrothermal conditions is described. The pore structure of the supports may be stabilized against hydrothermal reaction conditions by impregnating the catalyst supports with elements of Group IVB of the Periodic Tube of Elements.

Use of catalysts based on catalyst supports containing silicon dioxide

Disclosed are shell catalysts which contain, on powdered or shaped supports, one or more metals from groups VIII and IB of the Periodic Table of Elements. The catalysts are obtained by coating the support with the catalytically active metals in aqueous solutions of mono- or bimetallic colloids of these metals, wherein the colloids are stabilized by highly hydrophilic surfactants.

Shell catalysts, processes for their preparation and their use

3-hydroxy propionic acid is obtained in high yield through the catalytic oxidation of 3-hydroxy propionaldehyde with O.sub.2 or an O.sub.2 -containing gas in the aqueous phase in the presence of a platinum-group catalyst, in particular a Pd or Pt supported catalyst. The catalyst is used in a quantity corresponding to at least 10 percent by weight of the platinum-group metal relative to 3-hydroxy propionaldehyde.

Process for the production of 3-hydroxy propionic acid or a salt thereof

Malonic acid or a salt of the same is obtained at high yield according to the invention through the catalytic oxidation with oxygen or an O.sub.2 -containing gas of 3-hydroxy propionaldehyde or 3-hydroxy propionic acid in the aqueous phase. The conversion takes place in the presence of at least 10 percent by weight, relative to the C.sub.3 building block used, of a precious metal from the platinum group. Pd and Pt supported catalysts are preferred.

Process for the production of malonic acid or a salt thereof

A process for hydrogenolysis of C--O and C.dbd.O bonds in organic substances by reaction with hydrogen in the presence of a catalyst system which contains at least one metal from Groups VIII and/or IB of the Periodic System of Elements on a support consisting of at least one solid acid with an acid activity index of at least 90%.

Process for the hydrogenolysis of C--O and C.dbd.O bonds in organic

A catalyst for use in a fuel cell containing a platinum-aluminum alloy on a conductive carbon carrier, wherein the atomic ratio of platinum to aluminum is from 80:20 to 60:40 and the alloy is present on the carbon carrier in carbidized form with the structure of platinum-aluminum carbide Pt.sub.3 AlC.sub.0.5. Also disclosed are multimetallic alloy catalysts for use as electrode catalysts in fuel cells. Catalysts with high activity and stability are obtained on the basis of carbidized platinum-aluminum alloy catalysts by adding alloying elements of the groups VIB, VIIB, VIII and IB of the Periodic Table of Elements.

Platinum-aluminum alloy catalyst for fuel cells and method of its

A ternary platinum alloy catalyst on a conductive carbon carrier for use in fuel cells is disclosed. For the production of the catalyst, nitrate salts are used as precursors of the alloy components and all alloy components are deposited concurrently on the carbon carrier. This method of procedure yields ageing-stable catalysts with high oxygen mass activity.

Platinum alloy catalyst for fuel cells and method of its production

A process is disclosed for the selective catalytic hydrogenation of carbonyl groups in aromatic aldehydes of the formula: ##STR1## in which X is carboxyl, methyl or a halogen, to give the corresponding alcohols and methyl compounds. The catalytic hydrogenation is performed with the addition of a solvent optionally in the presence of organic acids on a shaped support catalyst containing a platinum group metal on a support made from titanium oxide in the presence of hydrogen at hydrogen partial pressures of 5 to 50 bar and temperatures of 100.degree. to 300.degree. C.

Selective catalytic hydrogenation of aromatic aldehydes

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Kleinostheim, Germany

Andreas Freund