Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Evonik Operations Gmbh

Michael Kroell

Stipan Katusic

Michael Kraemer

Edwin Staab

Peter Kress

Stefan Heberer

Wolfgang Lortz

Roland Wursche

Goetz Baumgarten

Guenther Michael

Julia Lyubina

Process for producing a silicon-carbon composite powder in which

Process for producing a silicon-carbon composite

A method of fractionating a dispersion of oxidic nanoparticles wherein at least one step of the method is a membrane crossflow filtration step, the flow of the dispersion over the membrane being brought about by means of driven rotating parts; and dispersions of oxidic nanoparticles that are obtainable by the method.

Method of fractionating oxidic nanoparticles by crossflow membrane filtration

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

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

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.

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Gelnhausen, Germany

Michael Kroell