Basf Aktiengesellschaft

Kraftanlagen Ag

Lothar Riekert

Michael Kotter

Ulrich Hammon

Wolfgang Hoelderich

Wilhelm Ruppel

Ulrike Wegerle

Hans Martan

Friedrich Weyland

Dieter Becker

A process for the catalytic gas-phase oxidation of propene or isobutene to acrolein or methacrolein in a tubular fixed bed reactor or catalytically active oxides with a .gtoreq.90% conversion of the initial olefin on a single passage, wherein the temperature of the gases containing the reactants in the direction of flow along the tubes from their entrance until the conversion of the initial olefin is from 30 to 70% is from 360.degree. to 420.degree. C. and is then adjusted to from 360.degree. to 300.degree. C. until the conversion of the initial olefin is from 80 to 90% and is thereafter maintained at from 330.degree. to 390.degree. C. until the gases emerge from the tubes, is described.

Preparation of acrolein or methacrolein by actalytic gas-phase oxidation

Method for the selective elimination of nitrogen oxides from exhaust

Hard, fracture-resistant catalysts are prepared from zeolites of the pentasil family by a process in which water, organic additives which increase the viscosity and a silicate are added to the zeolite powder, and the material is molded, dried and calcined. The fracture-resistant zeolites obtained are used as catalyst carriers.

Preparation of hard, fracture-resistant catalysts from zeolite powder

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Karlsruhe, Germany

Lothar Riekert