Degussa Aktiengesellschaft

Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler

Hans-Dieter Pletka

Edgar Koberstein

Herbert M Volker

Alfred Bozon

Rainer Domesle

Herbert Voelker

Rudolf Michel

Eduard Lakatos

A catalyst process is disclosed for the reduction of the ignition temperature of Diesel soot filtered out of the exhaust gas of Diesel engines by passing the exhaust gas over a catalytically active substance, which is selected from lithium oxide, copper chloride, vanadium oxide/alkali metal oxide combinations, a vanadate of an alkali metal or of cerium, or a silver or alkali metal perrhenate, preferably of sodium or silver, or mixtures of these substances.

Catalyst for the reduction of the ignition temperature of diesel soot

Process and catalyst for the reduction of the ignition temperature of

A process and catalyst is disclosed for the reduction of the ignition temperature of diesel soot filtered out of the exhaust fumes of diesel engines by passing the exhaust stream through a filter element. The filter element is a temperature resistant inert support onto which is deposited a catalytically effective amount of silver vanadate or a mixture of the temperature resistant carrier material and a catalytically effective amount of silver vanadate.

Catalyst for reducing the ignition temperature of diesel soot

A catalyst is disclosed for combustion of pollutants contained in the exhaust gases of internal combustion engines operated with alcohol. The catalyst consists of a metal carrier, a coating deposited on it made of a catalytically active aluminum oxide and an amount of palladium deposited on said coating. A production process for the catalyst is described which provides a final activation in oxidizing atmosphere or a formation in the stream of the exhaust gas that is to be purified at certain temperatures as well as the use of the catalyst for the simultaneous elimination of aldehydes, alcohols, carbon monoxide and hydrocarbons present in the exhaust gas.

Catalyst for the combustion of harmful substances contained in exhaust

A process for applying a coating containing platinum and/or palladium to the surface of a porous catalyst carrier, the depth of penetration being controlled by preloading the carrier with a determined amount of aqueous solution containing ammonium chloride.

Process for application of a catalytically active coating containing

A mechanically stable screen cloth construction is disclosed which is suitable for a catalyst support.

Mechanically stable screen cloth construction made of metal

An improved lambda sensor is disclosed for the measurement of the oxygen content in the exhaust gas of internal combustion engines in which the sensor element is provided with a gas permeable wrapping coated with a catalyst. The sensor delivers a clear well defined signal in the so-called rich exhaust gas, which makes possible a more precise adjustment of the fuel-air mixture fed to the internal combustion engine.

Sensor for measuring the oxygen content in the exhaust gas of combustion

The invention relates to a method for the manufacture of a metallic matrix which is 'monolithic', is coated with a catalysis promoting metal oxide and is disposed in a metal casing, in which the matrix is composed of alternately disposed plain and corrugated or folded metal sheets or plates, in which these sheets are stacked in a pile or are wound into a spiral. The method comprises a special resistance welding on the end faces of the matrix and arc welding of the side face of the matrix to the side of the casing, on which the metal oxide is applied.

Method of manufacturing a monolithic metallic matrix coated with a

A three-way catalyst is described for the purification of automobile exhaust gases formed of an active substance of platinum and rhodium and possibly base metal(s) at a certain weight ratio between the two noble metals and at a certain atomic ratio between the noble and the base metal, which are precipitated onto active aluminum oxide containing certain quantities of CeO.sub.2, ZrO.sub.2 and Fe.sub.2 O.sub.3, and whereby the catalyst is obtained by impregnating active aluminum oxide, possibly stabilized with alkaline earth metal, with a solution of cerium, zirconium and iron salt which is thereupon calcined in air at 500.degree.-700.degree. C. and then treated after application of an impregnation of salts of the active substance components in a gas current containing hydrogen at temperatures below 650.degree. C.

Catalyst for the purification of exhaust gases of internal combustion

There is provided a process for the production of sulfur containing organosilicon compounds of the formula (I) Z--Alk--S.sub.x --Alk--Z, where Z is the grouping: ##STR1## in which R.sup.1 is an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group with 5 to 8 carbon atoms, the benzyl group, phenyl or phenyl substituted with at least one methyl, ethyl or chloro group and R.sup.2 is alkoxy of 1 to 8 carbon atoms, methoxyethoxy, cycloalkoxy with 5 to 8 carbon atoms, phenoxy or benzyloxy, Alk is divalent saturated hydrocarbon group having 1 to 10 carbon atoms or such a group interrupted once or twice by --O--, --S-- or --NH-- and x is a number from 2.0 to 6.0 comprising reacting a compound of the formula (II) Y--Alk--Hal, where Y is: ##STR2## WHERE Hal is fluorine, chlorine, bromine or iodine with at least one compound of the formula R.sup.3 OH in which R.sup.3 is alkyl of 1 to 8 carbon atoms, methoxyethyl, cycloalkyl with 5 to 8 carbon atoms, phenyl or benzyl or in the case of forming (d) reacting a tris alkoxysilane with triethanolamine to form the corresponding silatrane and with a hydrosulfide of the formula (III) MeSH, in which Me is ammonium, an alkali metal atom or an equivalent of an alkaline earth metal and with sulfur, preferably in the presence of at least one organic solvent, separating from the halide formed, and removing the organic solvent.

Process for the production of sulfur containing organosilicon compounds

Compounds are prepared having the formula

Growing community of inventors

Freigericht, Germany

Hans-Dieter Pletka