Evonik Degussa Gmbh

Evonik Operations Gmbh

Armin Wiegand

Jürgen Meyer

Stipan Katusic

Peter Kress

Harald Alff

Michael Hagemann

Daniel Esken

Harald Herzog

Franz Schmidt

Ryo Takata

Tobias Renger

Sven Hill

Marcel Herzog

A process for producing a metal oxide powder by flame spray pyrolysis where

Method for producing metal oxides by means of spray pyrolysis

Process for producing metal oxide powders by means of flame spray pyrolysis, in which an aerosol comprising a metal compound is introduced into a flame in a reactor and reacted therein, and the metal oxide powder obtained is separated from gaseous substances, wherein a) the flame is formed by the ignition of an oxygen-containing gas (1) with a fuel gas, b) the aerosol is obtained by joint atomization of a solution containing a metal compound and an atomization gas by means of one or more nozzles and c) the ratio of the spray area to the cross-sectional reactor area is at least 0.2.

Process for producing metal oxide powders by means of flame spray pyrolysis

Iron-silicon oxide particles with a core-shell structure, which have a) a BET-surface area of 10 to 80 m/g, b) a thickness of the shell of 2 to 30 nm and c) a content of iron oxide of 60 to 90% by weight, of silicon dioxide of 10 to 40% by weight, based in each case on the enveloped particles, where d) the proportion of iron, silicon and oxygen is at least 99% by weight, based on the enveloped particles, and where e) the core is crystalline and the iron oxides comprise haematite, magnetite and maghemite, f) the shell consists of amorphous silicon dioxide and g) at least one compound or a plurality of compounds consisting of the elements silicon, iron and oxygen is/are present between shell and core.

Iron-silicon oxide particles with a core-shell structure

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Grosskrotzenburg, Germany

Armin Wiegand