Degussa Aktiengesellschaft

Other

Michael Baacke

Peter K Kleinschmit

Edgar Koberstein

Klaus Deller

Dietrich Arntz

Bernd Engler

Akos Kiss

Guenter Prescher

Mustafa Siray

Peter Kleine-Mollhoff

Reinhold Beand

A zeolite catalyst and a method for reduction of nitrogen oxides present in waste gas streams is described. The method includes mixing the waste gas containing nitrogen oxides with ammonia. At an elevated temperature, this mixture is passed over a zeolite catalyst. Preferably, the zeolite catalyst is in a monolithic or honeycomb form. The zeolite catalyst includes one or more of the following subgroup metals: copper, iron, molybdeum and cerium. The zeolite catalysts made in accordance with this invention show better conversion of nitrogen oxides and longer life than known catalysts.

Method for the reduction of nitrogen oxides from waste gases using a

Catalytic dealkoxylation of gem-dialkoxy compounds for synthesizing vinyl ethers is disclosed. Zeolites of the mordenite or ZSM5 type with an Na.sub.2 O/Al.sub.2 O.sub.3 molar ratio of 1:1.05 (.+-.0.25) are used as catalysts.

Compounds of catalysts for dealkoxylation of gem-dialkoxy

A catalyst for the production of hydrocarbon consists essentially of crystalline aluminum silicate, at least one compound of the metal zinc and/or cadmium and additionally silica. The catalyst is produced by heating a crystalline aluminum silicate, in a given case partially or completely converted to the hydrogen form, with a zinc and/or cadmium compound and molding with a silica containing binder.

Catalyst for the production of hydrocarbons and process for their

Alcohols and/or aliphatic ethers are converted to hydrocarbons employing catalysts consisting of crystalline aluminum silicate, a compound of zinc and/or cadmium and additional silica. The catalyst is produced by treating a crystalline aluminum silicate, in a given case, partially or completely converted into the hydrogen form with a zinc or cadmium compound and shaping with a silica containing binder.

Catalysts for converting alcohols and/or aliphatic ether to unsaturated

Process for preparing a pentasil zeolite

There is produced coarse particle mordenite by treating a reaction mixture consisting essentially of on a molar basis 2.5-10 Na.sub.2 O, Al.sub.2 O.sub.3, 15-30 SiO.sub.2, 400-4000 H.sub.2 O, 5-30 NaCl in an autoclave at a temperature of 140.degree. to 180.degree. C. until formation of crystals separating the crystalline product, washing with water and drying.

Process for the production of coarse particle mordenite

The crystalline aluminosilicate PZ 1 is produced by carrying out the crystalline in the presence of an organic template compound of the formula R.sub.3 P--(CH.sub.2).sub.n --PR.sub.3 X.sub.2 where R is a lower alkyl group, n is an integer of 2 to 6 and X is Br.sup.- or I.sup.-. The synthesis mixture has the composition:

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Hanau, Germany

Michael Baacke