The present invention relates to a layered catalyst composite of the type generally referred to as a three-way conversion catalyst having the capability of substantially simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides. The structure of the layered catalyst composite of the present invention is designed wherein there is a first layer and a second layer. The first layer comprises a first support; at least one first palladium component and an oxygen storage component in intimate contact with the palladium component; optionally another first platinum group metal component; a zirconium component; at least one first alkaline earth metal components and at least one first rare earth metal component selected from the group consisting of lanthanum metal components and neodymium metal components. The second layer comprises a second support; at least one second palladium component; optionally another second platinum group metal component; at least one second alkaline earth metal component; at least one second rare earth component selected from the group consisting of lanthanum metal components and neodymium metal components and a zirconium component.

Layered catalyst composite

A catalyst-carrying filter (10) which comprises a ceramic carrier (4) being made of SiC and having an average pore diameter of 10 to 250 νm and a porosity of 40 to 80 % and, formed thereon, a coating catalyst layer (2) comprising a catalyst, an auxiliary catalyst and a supporting material. The catalyst-carrying filter exhibits a reduced pressure loss.

Catalyst-carrying filter

Catalytic distillation structure for use in reaction distillation columns, a providing reaction sites and distillation structure and consisting of a catalyst component and a resilient component intimately associated therewith. The resilient component has at least about 70 volume % open space and being present with the catalyst component in an amount such that the catalytic distillation structure consist of at least 10 volume % open space.

Catalytic distillation structure

The present invention relates to an exhaust gas treatment catalytic article having an upstream catalytic zone and at least one downstream catalytic zone. The upstream catalytic zone has an upstream composition which has a first upstream support, and at least one first upstream palladium component. The upstream zone can have one or more layers. The downstream catalytic zone has a first downstream layer which has a first downstream support and a first downstream precious metal component. A second downstream layer has a second downstream support and a second downstream precious metal component.

Exhaust gas treatment system

The present invention relates to a zirconium, rare earth containing composition comprising zirconium, cerium, neodymium and praseodymium components and the use of this composition in a catalyst composition useful for the treatment of gases to reduce contaminants contained therein and method process to make the catalyst composition. The catalyst has the capability of substantially simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides.

Catalyst composition containing oxygen storage components

An alumina catalyst, which has a desired porosity and surface area and is stable at high temperatures is formed by contacting a substrate with an alkali aluminate solution for a period of time sufficient to form an adherent film of hydrated alumina on the substrate, separating the substrate with the adherent film of hydrated alumina from the solution, heating the substrate and alumina film under calcining conditions until an alumina film of desired porosity and surface area is formed, and then contacting the calcined alumina film with a material which stabilizes the alumina during subsequent heating. Optionally, the alumina film can then be further calcined at a temperature higher than that used in the first calcining conditions, preferably at a temperature up to about 1260° C. The stabilizing material can be one of several compounds including those of barium, silcon, and the rare earth metals. Further, dissolving the stabilizing material and a catalytic metal, such as platinum, into a solvent, and contacting this solution with the calcined alumina film produces a substantially even distribution of the catalytic metal on the calcined alumina film.

Alumina catalyst stable at high temperatures

Catalytic muffler construction for exhaust emissions control in an internal combustion engine system

1,191,094. Disproportionating alkylaromatic hydrocarbons. TEXACO DEVELOPMENT CORP. 3 Feb., 1969 [29 Feb., 1968], No. 5625/69. Heading C5E. Alkylaromatic hydrocarbons are disproportionated by contacting them admixed with a sulphide compound under disproportionation conditions with hydrogen mordenite having a SiO 2 : Al 2 O 3 mole ratio greater than 10: 1 and a sulphided Group VIII and/or VI B metal associated therewith. The alkylaromatic feed may be methylnaphthalene or an alkylbenzene having one to three C 1 -C 4 alkyl groups, e.g. toluene, xylene, mesitylene, ethylbenzene or cumene. The Group VIII metal may be Pt, Pd, Rh or Ru in amount 0A05-2% by wt. of the mordenite, or Ni, Co or Fe in amount 0A5-10% by wt. of the mordenite. The Group VIB metal (Cr, Mo, W) may be used in amount 0A5-20% by wt. The sulphide compound may be H 2 S, CS 2 , methyl sulphide or ethylmercaptan. The process is preferably conducted in the presence of hydrogen. Suitable disproportionation conditions comprise a temperature of 400-750‹ F. and a pressure of 0-1000 p.s.i.g. Mordenite catalysts having a sufficient SiO 2 : Al 2 O 3 mole ratio may be produced by acid leaching e.g. with boiling dilute HCl. Examples of the invention describe the disproportionation of toluene to benzene and C 8 aromatics.

Disproportionation of alkyl aromatics with decationized mordenite containing a sulfided metal

The combination of an internal combustion engine having means for providing additional air adjacent the exhaust valves thereof, valve means for back pressure control in the exhaust system, and an acoustic catalytic muffler having compounds capable of reducing lead products of combustion in exhaust gases prior to their contact with a combination of oxidation catalysts

Internal combustion engine system for exhaust emissions control utilizing an acoustic catalytic muffler

A smoke filter adapted to receive a stream of hot engine exhaust gas and to remove particulate carbon particles therefrom. The hot exhaust gas stream is passed progressively across catalytic beds which are spaced slightly apart within a closed casing. Each catalytic bed is mounted to an individual support member which is in turn cross braced with tension elements to protect the catalyst material from damage due to shock loading and high localized temperatures experienced within the catalyst bed.

John T Brandenburg

Papers

Alumina catalyst stable at high temperatures

Catalytic muffler construction for exhaust emissions control in an internal combustion engine system

Disproportionation of alkyl aromatics with decationized mordenite containing a sulfided metal

Internal combustion engine system for exhaust emissions control utilizing an acoustic catalytic muffler

Filter for internal combustion exhaust gases