Evonik Degussa Gmbh

Evonik Operations Gmbh

Christian Schulze Isfort

Kai Schumacher

Horst-Werner Zanthoff

Rainer Golchert

Thomas Quandt

Helmut Roth

Andreas Hille

Dietrich Maschmeyer

Markus Winterberg

Christian Boeing

Michael Hagemann

Christian Böing

Asli Nau

A process for production of silica having variable thickening wherein

Method for producing silicic acid with variable thickening

Process for production of silica having variable thickening wherein

Method for producing a metal oxide powder in which

Process for producing metal oxides

The present invention relates to mixed oxide compositions, to the use thereof as a catalyst for cleavage of alkyl tert-alkyl ethers or tertiary alcohols, and to a process for cleaving alkyl tert-alkyl ethers or tertiary alcohols to isoolefins and alcohol or water.

Mixed oxide compositions and process for preparing isoolefins

Silicon-aluminum mixed oxide powder having a weight ratio of (AlO/SiO)in the total primary particle of from 0.003 to 0.05, a weight ratio (AlO/SiO)of the primary particles in a surface layer having a thickness of about 5 nm which is less than in the total primary particle and a BET surface area of from 50 to 250 m/g. It is prepared by igniting one or more silicon compounds selected from the group consisting of CHSiCl, (CH)SiCl, (CH)SiCl and (n-CH)SiCl, a hydrolysable and oxidizable aluminum compound, at least one fuel gas and air and burning the flame into a reaction chamber, subsequently separating the solid from gaseous materials and subsequently treating the solid with water vapor. The silicon-aluminum mixed oxide powder can be used as catalyst.

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Kapellen, Belgium

Christian Schulze Isfort