Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Umicore Ag & Co Kg

Edwin Staab

Stipan Katusic

Peter Kress

Michael Kraemer

Michael Kroell

Stefan Heberer

Günther Michael

Peter Biberbach

Guenther Michael

Emmanuel Auer

Andreas Gutsch

Karsten Ruth

Markus Pridöhl

Michael Gross

Geoffrey J Varga

Michael Krämer

Winfried Weber

Process for the production of a metal oxide powder having a BET surface area of at least 20 m/g by reacting an aerosol with oxygen in a reaction space at a reaction temperature of more than 700&#xb0; C. and then separating the resulting powder from gaseous substances in the reaction space, wherein

Process for the production of metal oxide powders

Nanoscale, pyrogenically produced zinc oxide having a BET surface area of 10 to 200 m/g, which is in the form of aggregates of anisotropic primary particles and whereby the aggregates display an average diameter of 50 to 300 nm. It is obtained from zinc powder, which is converted to zinc oxide powder in the four successive reaction zones, evaporation zone, nucleation zone, oxidation zone and quench zone. It can be used in sunscreen formulations.

Nanoscale zinc oxide, process for its production and use

Cerium oxide powder having carbonate groups and made of crystalline primary particles containing cerium oxide and having carbonate groups on the surface and in a region close to the surface, and having a BET surface area of from 25 to 150 m/g, a mean diameter of from 5 to 50 nm, a carbonate concentration in the region close to the surface decreasing inwardly from the surface, a carbon content due to carbonate groups on the surface of from 5 to 50% by area, a carbon content due to carbonate groups at a depth of about 5 nm in a region close to the surface of from 0 to 30% by area, a content of cerium oxide calculated as CeOand based on the powder of at least 99.5% by weight and a content of organic and inorganic carbon of from 0.01 to 0.3% by weight. A dispersion containing this powder.

Cerium oxide powder and cerium oxide dispersion

Process and apparatus for the thermal treatment of pulverulent substances, in which the pulverulent substance is dispersed in a carrier gas and is passed in a continuous manner through a heated reactor where it is thermally treated and is then quenched by a cooling medium and is collected in a gas-solids separating unit.

Process and apparatus for the thermal treatment of pulverulent substances

Polycrystalline cerium oxide powder in the form of aggregates of primary particles with a specific surface of between 70 and 150 m/g, an average primary particle diameter of between 5 and 20 nm and an average, projected aggregate diameter of between 20 and 100 nm. It is produced in that an aerosol is reacted in a flame obtained from a hydrogen-containing combustible gas and primary air and the solid obtained is then separated from the gaseous substances.

Cerium oxide powder

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Geiselbach, Germany

Edwin Staab