Abstract: Catalytic cracking catalyst compositions and processes for cracking hydrocarbons to maximize light olefins production are disclosed. Catalyst compositions comprise at least one zeolite having catalytic cracking activity under catalytic cracking conditions, preferably Y-type zeolite, which zeolite has low amounts of yttrium in specified ratios to rare earth metals exchanged on the zeolite. Catalyst and processes of the invention provide increased yields of light olefins and gasoline olefins during a FCC process as compared to conventional lanthanum containing Y-type zeolite FCC catalysts.

Abstract: This invention relates to a process of preparing a catalyst from zeolite and peptized alumina. The invention comprises adding a yttrium compound to the zeolite, either prior to, during, or after its combination with the peptized alumina. The yttrium compound can be added to the zeolite via exchange of yttrium onto the zeolite prior to addition of peptized alumina, or the yttrium can be added as a soluble salt during the combination of the zeolite and peptized alumina. In either embodiment, the zeolite catalyst is then formed from the zeolite, yttrium and peptized alumina, optionally containing other inorganic oxide. This invention is suitable for preparing fluid cracking catalysts.

Abstract: This invention relates to a process of preparing an improved catalyst comprising a clay derived zeolite. In particular, the invention comprises combining an yttrium compound with a zeolite produced by treating clay with a silica source and under alkaline conditions. The clay derived zeolite can be further combined with conventional matrix and/or binder precursors to form particulates suitable for use as catalysts in fluid catalytic cracking (FCC). Alternatively, the clay that is treated with the silica source and alkaline conditions can be in particulate form having sizes suitable for use in FCC, and the zeolite is produced in situ within the particulate. Yttrium compound is then combined with the zeolite in the particulate, e.g., via impregnation. It has been shown that the addition of the yttrium compound improves zeolite surface area retention, and zeolite stability in catalysts comprising clay derived zeolites.

Abstract: Disclosure relates to a slip catalyst for reducing a NO2 content in an exhaust train of an internal combustion engine flowed through by an exhaust gas flow, which has an oxidizing catalyst for the formation of NO2 and a particulate filter arranged downstream for binding carbon black particles and simultaneous and/or subsequent reaction of the same with NO2 formed on the oxidizing catalyst, having a substrate that is provided with a coating, which coating reduces a proportion of NO2 in the exhaust gas flow flowing through. The coating has at least two elements from the group of rare-earth metals, which are present in the coating in the form of a salt or an oxide or in an elementary form and in a concentration of more than 300.0 g/m3.

Abstract: The present invention provides a catalyst which can sufficiently remove nitrogen oxides in an exhaust gas. The catalyst for removing nitrogen oxides to achieve an object of the present invention includes a monolithic support which is coated with a lower layer containing a catalytic component A comprising cerium oxide and an upper layer containing a catalytic component B comprising at least one kind of metal selected from a group consisting of copper, manganese, iron, cobalt and nickel or a compound thereof, and zeolite.

Abstract: A metal-modified alkylation catalyst including a metal/zeolite is provided where the metal is one or two selected from the group consisting of yttrium and a rare earth of the lanthanide series other than cerium. Where two metals are used, one may be Ce or La. The metal-promoted zeolite is useful as a molecular sieve aromatic alkylation catalyst for the production of ethylbenzene by the ethylation of benzene in the liquid phase or critical phase. An alkylation product is produced containing ethylbenzene as a primary product with the attendant production of heavier alkylated by-products of no more than 10-60 wt % of the ethylbenzene.

Abstract: A cracking catalyst contains a substantially inert core and an active shell, the active shell containing a zeolite catalyst and a matrix. The catalyst is formed by spray-drying a slurry containing water, substantially inert microspheres and a zeolite precursor and crystallizing zeolite in the active shell to create the cracking catalyst. Methods of using the cracking catalyst are also described.

Abstract: Catalyst composition comprising a zeolite and a binder, wherein the zeolite is a Ga containing zeolite and the binder is a La modified kaolin and process for converting lower alkanes to aromatic hydrocarbons, using said catalyst composition. Preferably the aromatic hydrocarbons consist of at least 45 wt % of benzene, toluene and xylenes.

Abstract: Provided is a catalyst comprising (a) a zeolite material having a mean crystal size of at least about 0.5 ?m, having a CHA framework that contains silicon and aluminum, and having a silica-to-alumina mole ratio (SAR) of about 10 to about 25; and (b) an extra-framework promoter metal (M) disposed in said zeolite material as free and/or exchanged metal, wherein the extra-framework promoter metal is copper, iron, and mixtures thereof, and is present in a promoter metal-to-aluminum atomic ratio (M:Al) of about 0.10 to about 0.24 based on the framework aluminum; and optionally comprising (c) at least about 1 weight percent of cerium in said zeolite material, based on the total weight of the zeolite, wherein said cerium is present in a form selected from exchanged cerium ions, monomeric ceria, oligomeric ceria, and combinations thereof, provided that said oligomeric ceria has a particle size of less than 5 ?m.

Abstract: A catalyst for selective catalytic reduction of NOx having one or more transition metals selected from Cr, Mn, Fe, Co, Ce, Ni, Cu, Zn, Ga, Mo, Ru, Rh, Pd, Ag, In, Sn, Re, Ir, Pt, and mixtures thereof supported on a support, wherein the support has a molecular sieve having at least one intergrowth phase having at least two different small-pore, three-dimensional framework structures.

Abstract: The invention is a composition that is suitable for reducing sulfur species from products produced by petroleum refining processes, especially gasoline products produced by fluidized catalytic cracking (FCC) processes. The composition comprises zeolite, yttrium, and at least one element selected from the group consisting of zinc, magnesium and manganese, wherein the yttrium and element are present as cations. The yttrium and zinc are preferably present as cations that have been exchanged onto the zeolite. The zeolite is preferably a zeolite Y.

Abstract: The present invention relates generally to zeolites having a silica/alumina ratio of less than or equal to 10 (Si/Al?10) that are exchanged with Ag+ and thermally treated in such a way to favor adsorption over alternative catalytic and chemically reactive functionalities. The adsorbents of the present invention and the method of producing such adsorbents maximize the working adsorption capacity through ?-complexation. Applications for such adsorbents include any process in which contaminants from gas streams can form ?-complexes with the Ag in the zeolite, particularly the removal of CO, ethylene, propylene and the like from air and CO/H2 from air in prepurifier adsorbers in the production of ultra high purity (UHP) N2.

Abstract: A honeycomb structural body includes at least one honeycomb unit which has a longitudinal direction. The at least one honeycomb unit includes plural cell walls, an inorganic binder, and inorganic particles. The plural cell walls extends along the longitudinal direction from one end face to another end face of the at least one honeycomb unit to define plural cells. The inorganic particles include ceria particles, and a ceramic material which has a degree of self-sintering lower than a degree of self-sintering of the ceria particles.

Abstract: A close coupled three-way catalyst for purification of exhaust gas of motor vehicle and the preparation thereof. The support is selected from cordierite honeycomb ceramic materials having a pore volume of 0.25-0.35 ml/g. The coating layer is the mixture of hexaaluminate and perovskite-type composite oxide, cerium-zirconium solid solution, rare-earth oxide and alumina, alkali-earth oxide and zeolite having a high Si/Al ratio. The active components are palladium-rhodium, rare-earth oxide and transition metal in the hexaaluminate and perovskite-type composite oxide. The catalyst has not only the function of low-temperature catalytic oxidation of hydrocarbons, but also the function of reduction of nitrogen oxides, and can be used for purifying the exhaust gas of motor vehicles using gasoline, liquid gas, or CNG as fuel.

Abstract: According to at least one aspect of the present invention, a urea-resistant catalytic unit is provided. In at least one embodiment, the catalytic unit includes a catalyst having a catalyst surface, and a urea-resistant coating in contact with at least a portion of the catalyst surface, wherein the urea-resistant coating effectively reduces urea-induced deactivation of the catalyst. In at least another embodiment, the urea-resistant coating includes at least one oxide from the group consisting of titanium oxide, tungsten oxide, zirconium oxide, molybdenum oxide, aluminum oxide, silicon dioxide, sulfur oxide, niobium oxide, molybdenum oxide, yttrium oxide, nickel oxide, cobalt oxide, and combinations thereof.

Abstract: A carbon monoxide combustion catalyst and a method of making the catalyst used in fluid bed catalytic cracking process. The catalyst can contain metals and other composites which promote oxidation of carbon monoxide to carbon dioxide during regeneration of spent FCC catalyst.

Abstract: Catalyzed soot filters comprising a wall flow monolith having porous walls, a first washcoat permeating the porous walls and a second washcoat on the porous walls are disclosed. Methods of manufacturing catalyzed soot filters and diesel engine exhaust emission treatment systems are also disclosed.

Abstract: An oxidation catalyst comprises an extruded solid body comprising: 10-95% by weight of at least one binder/matrix component; 5-90% by weight of a zeolitic molecular sieve, a non-zeolitic molecular sieve or a mixture of any two or more thereof; and 0-80% by weight optionally stabilised ceria, which catalyst comprising at least one precious metal and optionally at least one non-precious metal, wherein: (i) a majority of the at least one precious metal is located at a surface of the extruded solid body; (ii) the at least one precious metal is carried in one or more coating layer(s) on a surface; (iii) at least one metal is present throughout the extruded solid body and in a higher concentration at a surface; (iv) at least one metal is present throughout the extruded solid body and in a coating layer(s) on a surface; or (v) a combination of (ii) and (iii).

Abstract: A three way catalyst comprises an extruded solid body comprising: 10-100% by weight of at least one binder/matrix component; 5-90% by weight of a zeolitic molecular sieve, a non-zeolitic molecular sieve or a mixture of any two or more thereof; and 0-80% by weight optionally stabilised ceria, which catalyst comprising at least one precious metal and optionally at least one non-precious metal, wherein: (i) the at least one precious metal is carried in one or more coating layer(s) on a surface of the extruded solid body; (ii) at least one metal is present throughout the extruded solid body and at least one precious metal is also carried in one or more coating layer(s) on a surface of the extruded solid body; or (iii) at least one metal is present throughout the extruded solid body, is present in a higher concentration at a surface of the extruded solid body and at least one precious metal is also carried in one or more coating layer(s) on the surface of the extruded solid body.

Abstract: A method for controlling 2-isomer content in linear alkylbenzene obtained by alkylating benzene with olefins and catalyst used in the method.

Abstract: Extruded honeycomb catalyst bodies and methods of manufacturing same. The catalyst body includes a first oxide selected from the group consisting of tungsten oxides, vanadium oxides, and combinations thereof, a second oxide selected from the group consisting of cerium oxides, lanthanum oxides, zirconium oxides, and combinations thereof, and a zeolite.

Abstract: Deoxygenation catalyst for coal mine methane, its preparation method and application in catalytic deoxygenation of coal mine methane in oxygen-containing environment. The catalyst comprises a first composition serving as the active content and a second composition serving as the additive. The first composition consists of one or more platinum group noble metals selecting from the group consisting of Pd, Pt, Ru, Rh and Ir. The second composition consists of one or more alkaline metals or alkaline earth metals selected from the group consisting of Na2O, K2O, MgO, CaO, SrO and BaO; CeO2 and lanthanides rare earth metals such as Pr, Nd, Sm, Eu, Gd, etc.; and/or transition metals such as Y, Zr, La, etc.; and/or Al2O3 oxides complexes. Said catalyst can effectively eliminate the oscillatory behavior during catalytic combustion under oxyen-lean condition.

Abstract: The present invention is directed to certain catalyst compositions and processes that are capable of reducing sulfur compounds normally found as part of the gasoline fraction streams of fluid catalytic cracking processes. The present invention is a cracking catalyst composition comprising a zeolite in combination with a Lewis Acid containing component, wherein the cracking catalyst composition comprises 0.2% Na2O or less. It has been found that sulfur compounds in hydrocarbon feeds to fluid catalytic cracking processes can be reduced by at least 15% compared to the same composition, which does not comprise the aforementioned Lewis Acid containing component.

Abstract: The invention relates to a method for forming olefins from an oxygenate-containing feedstock, comprising contacting the at least partially vaporized feed comprising oxygenates with a first catalyst upstream of an OTO reactor, the first catalyst consisting of a reactive guard bed of metal oxides comprising one or more metals from Groups 2, 3, and 4 of the Periodic Table and/or one or more metals in the Lanthanide and Actinide series, then contacting the feedstock in the OTO reactor with a second catalyst under conditions effective to form an effluent comprising the olefins.

Abstract: The alkylation of aromatic compound with acyclic mono-olefin is effected at low aromatic compound to mono-olefin ratios with reduced co-production of heavies. In the processes a small crystal, acidic FAU molecular sieve is used as a catalyst under alkylation conditions. This invention also relates to catalysts containing small crystal, acidic FAU molecular sieve and at least one other acidic catalytic component.

Abstract: The zeolite structure is a porous zeolite structure constituted of a formed article obtained by extruding a zeolite raw material containing zeolite particles and an inorganic binding material including at least basic aluminum chloride, a ratio P1 (P1=V2/V1×100) of a volume V2 of the inorganic binding material in the zeolite structure with respect to a volume V1 of the zeolite structure is from 10 to 50 vol %, and a relation of equation (1) is satisfied: P2/P1?1.0 ??(1), in which P1 is the ratio of the volume V2 of the inorganic binding material in the zeolite structure with respect to the volume V1 of the zeolite structure and P2 (P2=Vb/Va×100) is a ratio of volumes Vb of pores having pore diameters of 0.003 to 0.03 ?m with respect to the whole pore volume Va of the zeolite structure.

Abstract: The zeolite honeycomb structure is constituted of a zeolite raw material containing zeolite particles 32, noble metal loaded catalyst carriers 34 containing a noble metal loaded onto catalyst carriers, and an inorganic binding material 33 in a honeycomb shape. An average particle diameter of the noble metal loaded catalyst carriers 34 is ten or more times an average particle diameter of the zeolite particles 32. Moreover, the noble metal loaded catalyst carriers are contained in an amount corresponding to a volume ratio which is from 5 to 25 vol % with respect to 100 vol % of the zeolite particles, and the noble metal is loaded onto the noble metal loaded catalyst carriers in an amount corresponding to a mass ratio which is from 0.2 to 2.0 mass % with respect to 100 mass % of the zeolite particles in the zeolite honeycomb structure 100.

Abstract: This invention relates to the composition, method of making and use of a fluidized catalytic cracking (“FCC”) catalyst that is comprised of a new Y zeolite which exhibits an exceptionally low small mesoporous peak around the 40 ? (angstrom) range as determined by nitrogen adsorption measurements. FCC catalysts made from this new zeolite exhibit improved rates of heavy oil cracking heavy oil bottoms conversions and gasoline conversions. The fluidized catalytic cracking catalysts herein are particularly useful in fluidized catalytic cracking (“FCC”) processes for conversion of heavy hydrocarbon feedstocks such as gas oils and vacuum tower bottoms.

Abstract: A process is presented for the production of linear alkylbenzenes. The process includes contacting an aromatic compound with an olefin in the presence of a selective zeolite catalyst. The catalyst includes two zeolites combined to improve the linearity, and to produce detergent grade LAB. The two zeolites are selected to limit skeletal isomerization while producing a desired 2-phenyl content for the LAB.

Abstract: Solid mixed catalysts and methods for use in conversion of triglycerides and free fatty acids to biodiesel are described. A batch or continuous process may be used with the catalysts for transesterification of triglycerides with an alkyl alcohol to produce corresponding mono carboxylic acid esters and glycerol in high yields and purity. Similarly, alkyl and aryl carboxylic acids and free fatty acids are also converted to corresponding alkyl esters. The described catalysts are thermostable, long lasting, and highly active.

Abstract: A catalyst is disclosed for use in the alkylation of benzene with a substantially linear olefin. The catalyst allows for cation exchange with a rare earth element to increase the alkylation of benzene, while reducing the amount of isomerization of the alkyl group. This is important for increasing the quality of the alkylbenzene by increasing the linearity of the alkylbenzene.

Abstract: A catalyst and a process for selective catalytic reduction of nitrogen oxides in diesel engine exhaust gases with ammonia or a compound decomposable to ammonia are described. The exhaust gas to be cleaned is passed together with ammonia or a compound decomposable to ammonia over a catalyst which comprises a zeolite or a zeolite-like compound containing 1-10% by weight of copper, based on the total weight of the zeolite or of the zeolite-like compound, and a homogeneous cerium-zirconium mixed oxide and/or a cerium oxide. The zeolite used or the zeolite-like compound used is selected from the group consisting of chabazite, SAPO-34, ALPO-34 and zeolite-?.

Abstract: A catalyst is presented for use in the production of linear alkylbenzenes. The catalyst includes two zeolites combined to improve the quality of the linear alkylbenzenes. The catalyst includes a first zeolite that is UZM-8 and a second zeolite that is a low silica to alumina ratio zeolite. The second zeolite is also cation exchanged with a rare earth elements to provide a zeolite that increases the alkylation of benzene while reducing the amount of skeletal isomerization.

Abstract: A sulfur reduction catalyst useful to reduce the levels of sulfur in a cracked gasoline product comprises a metal vanadate compound. The metal vanadate compound can be supported on a molecular sieve such as a zeolite in which the metal vanadate compound is primarily located on the exterior surface of the pore structure of the zeolite and on the surface of any matrix material used to bind or support the zeolite.

Abstract: The present invention relates to a catalyst for catalytic cracking fluidized-bed, and the technical problems to be primarily solved by the present invention are high reaction temperature, low cryogenic activity of catalysts and worse selectivity during the preparation of ethylene-propylene by catalytically cracking naphtha. The present invention uses the composition having the chemical formula (on the basis of the atom ratio): AaBbPcOx, so as to magnificently solve said problems. The present invention therefore can be industrially used to produce ethylene and propylene by catalytically cracking naphtha.

Abstract: Method of preparation of antioxidant composition on the basis of diphenylamine by catalytic alkylation of diphenylamine by an threefold excess of diisobutylene with regard to diphenylamine in the presence of an alkylation catalyst t in an amount of 5 to 30% by weight, as referred to diphenylamine, at a temperature of 140 to 160° C. Water contained in the catalyst, is removed and subsequently diphenylamine is left to complete the reaction with diisobutylene and after the reaction is finished, the reaction mixture is separated from the catalyst, unreacted diisobutylene is removed from it and the reaction product is obtained.

Abstract: The present invention is a selective catalytic reduction type catalyst for purifying nitrogen oxides in exhaust gas exhausted from lean combustion engines using ammonia or urea as a reducing agent, it is provided with a selective catalytic reduction type catalyst The catalyst comprises a lower-layer catalyst layer (A) having an oxidative function for nitrogen monoxide (NO) in exhaust gas and an upper-layer catalyst layer (B) having an adsorbing function for ammonia on the surface of a monolithic structure type carrier (C), and that the lower-layer catalyst layer (A) comprises a noble metal component (i), an inorganic base material constituent (ii) and zeolite (iii), and the upper-layer catalyst layer (B) comprises substantially none of component (i) but the component (iii).

Abstract: The invention is a composition that is suitable for reducing sulfur species from products produced by petroleum refining processes, especially gasoline products produced by fluidized catalytic cracking (FCC) processes. The composition comprises zeolite, yttrium, and at least one element selected from the group consisting of zinc, magnesium and manganese, wherein the yttrium and element are present as cations. The yttrium and zinc are preferably present as cations that have been exchanged onto the zeolite. The zeolite is preferably a zeolite Y.

Abstract: An oxidation catalyst deposited on a substrate is described for the destruction of CO and volatile organic compounds, in particular halogenated organic compounds, from an emissions stream at temperatures from 250° C. to 450° C. The oxidation catalyst includes at least two platinum group metals, one of which is either platinum or ruthenium, supported on refractory oxides, such as a solid solution of CeO2 and ZrO2, and tin oxide and/or silica.

Abstract: The invention relates to a coating composition for diesel oxidation catalysts or a combination of diesel oxidation catalysts and diesel particle filters, said coating composition comprising a combination of a noble metal on a metal oxide, with the exception of cerium oxide, and a zeolite doped with iron. The invention also relates to a catalyst provided with the coating according to the invention, and to a method for treating the exhaust gas of diesel internal combustion engines.

Abstract: A biofuel production method, catalyst and system. The method may include combining a feedstock comprising a carbonaceous material with a consumable catalyst to produce a feedstock/catalyst mixture, and subjecting the feedstock/catalyst mixture to a vacuum pyrolytic gasification and liquefaction process to produce one or more biofuels. The catalyst includes effective amounts of various catalyst constituents, which may include some or all of kaolin, zeolite, amorphous silica, alumina aluminum phosphate and rare earth elements. The system may include apparatus for heating the feedstock/catalyst mixture under selected temperature and vacuum pressure conditions to produce a gaseous effluent comprising one or more hydrocarbon fractions, and additional distillation and condensation apparatus to produce one or more liquid and gaseous fuels.

Abstract: The present invention provides a process for the catalytic cracking of a hydrocarbon, characterized in that the catalytic cracking is carried out in the presence of a crystalline aluminosilicate zeolite catalyst carrying a rare earth element in an amount ranging from 0.4 to 20 in terms of atomic ratio relative to the aluminum of the zeolite using a reactor which permits continuous regeneration of the catalyst and which is of a fluidized bed type, a moving bed type, or a transfer line reaction type under reaction conditions involving a reaction temperature ranging from 500 to 700° C., a reaction pressure ranging from 50 to 500 kPa, a steam to hydrocarbon mass ratio ranging from 0.01 to 2, and a contacting time ranging from 0.1 to 10 seconds. With this process, the generation of by-products such as aromatic hydrocarbons and heavy hydrocarbons can be inhibited and light olefins such as ethylene and propylene can be selectively produced in a stable manner for a long period of time.

Abstract: The present invention provides a catalytic cracking catalyst, processing method and use thereof. When the catalyst is added into a commercial catalytic cracking unit, it has an initial activity of not higher than 80, preferably not higher than 75, more preferably not higher than 70, a self-balancing time of 0.1-50 h, and an equilibrium activity of 35-60. Said method enables the activity and selectivity of the catalyst in the catalytic cracking unit to be more homogeneous and notably improves the selectivity of the catalytic cracking catalyst, so as to obviously reduce the dry gas and coke yields, to sufficiently use steam and to reduce the energy consumption of the FCC unit.

Abstract: A method for preparing monolithic catalyst washcoat is disclosed and includes the following steps: preparing a coating slurry; pretreating a monolithic carrier; applying the coating slurry onto the monolithic carrier by vacuum spraying; removing the excess coating slurry by vacuum extraction; and obtaining the monolithic carrier applied with the washcoat after drying and calcination. The washcoat of 5-20 wt % can be obtained on the monolithic carrier of the present invention by one-off applying. The method can be used to prepare the washcoat on monolithic cordierite ceramic carrier, monolithic metal carrier, monolithic active carbon carrier or monolithic molecular sieve carrier. The obtained washcoat is uniform, and has good adhesion with the carrier and excellent repeatability.

Abstract: Co-catalysts comprising yttria-stabilized aluminum oxide having nickel oxide loaded thereon, their uses and methods of preparing are described. Also, hybrid catalysts comprising these co-catalysts along with main catalyst components, and their uses and methods of preparing are described. Monocomponent catalysts having nickel oxide loaded thereon, their uses and methods of preparing are also described.

Abstract: Alumina binder obtained from aluminum sulfate, the process of preparing the binder and the process of using the binder to prepare catalyst compositions are disclosed. Catalytic cracking catalyst compositions, in particularly, fluid catalytic cracking catalyst composition comprising zeolites, optionally clay and matrix materials bound by an alumina binder obtained from aluminum sulfate are disclosed.

Abstract: The present invention provides a catalyst which can sufficiently remove nitrogen oxides in an exhaust gas. The catalyst for removing nitrogen oxides to achieve an object of the present invention includes a monolithic support which is coated with a lower layer containing a catalytic component A comprising cerium oxide and an upper layer containing a catalytic component B comprising at least one kind of metal selected from a group consisting of copper, manganese, iron, cobalt and nickel or a compound thereof, and zeolite.

Abstract: A process for the production of high attrition resistant inorganic compositions is provided. The formation of highly attrition resistant compositions is accomplished by forming a slurry of inorganic components, a binder, and optionally clay and matrix materials, milling the slurry, and cooling the milled slurry to a temperature below 17° C., preferably below 10° C. The cooled slurry is subjected to spray-drying, and optionally calcining and/or washing, to provide highly attrition resistant inorganic particles. Catalytic cracking catalysts formed by the process are also disclosed.

Abstract: The present invention pertains to catalyst systems for nitrogen oxide, carbon monoxide, hydrocarbon, and sulfur reactions that are free or substantially free of platinum group metals. The catalyst system of the present invention comprise a substrate and a washcoat, wherein the washcoat comprises at least one oxide solid, wherein the oxide solid comprises one or more selected from the group consisting of a carrier material oxide, a catalyst, and mixtures thereof. The catalyst system may optionally have an overcoat, wherein the overcoat comprises at least one oxide solid, wherein the oxide solid comprises one or more selected from the group consisting of a carrier material oxide, a catalyst, and mixtures thereof. The catalyst comprises one or more selected from the group consisting of a ZPGM transition metal catalyst, a mixed metal oxide catalyst, a zeolite catalysts, or mixtures thereof.

Abstract: The invention provides a catalyst for catalytically reducing nitrogen oxides in diesel engine exhaust gas by use of unburnt carbon contained in the diesel engine exhaust gas as a reducing agent, the catalyst comprising: (a) an acid zeolite, or (b) an alkali metal- and/or alkaline earth metal-containing zeolite, or (c) a rare earth metal-containing zeolite, or (d) a zeolite containing at least one transition metal selected from Fe, Co, Ni and Cu.