Abstract: The particulates, etc. deposited on the trap are burnt in such a manner that the trap is heated so that the temperature of the trap does not exceed 500° C. or the maximum temperature gradient in radial direction of the trap is 20° C./mm or less, preferably 10° C./mm or less.

Abstract: The invention is a method for treating diesel exhaust gases, i.e., in an oxidizing atmosphere, with a catalyst which has a broadened operating temperature window at higher temperatures. It is a mixture of particles comprising platinum/alumina and a bi-metal oxide of manganese and zirconium.

Abstract: A perovskite ceramic material having the general formula:A.sub.x A'.sub.x' A".sub.x" B.sub.y B'.sub.y' B".sub.y" O.sub.3-.delta.,whereinA, A' and A" each is one or more metals selected from the group of lanthanide metals;B, B' and B" each is a metal selected from the group of transition metals and group 3a, and noble metals of group 8b;x+x'+x"<1 and/or y+y'+y"<1such that .SIGMA.x.sub.i .noteq..SIGMA.y.sub.i.

Abstract: Partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide is carried out by a fluidized bed process which includes the steps of passing air through a perovskite-type ceramic mixed conductor in an adsorption zone at an elevated temperature, thereby at least partially saturating the mixed conductor with oxygen, and subsequently contacting the hot, at least partially oxygen-saturated mixed conductor with a hydrocarbon in a partial oxidation reaction zone. During the partial oxidation reaction phase of the process, the sorbed oxygen reacts with the hydrocarbon, thereby producing hydrogen, carbon monoxide or mixtures of these. The oxygen-depleted mixed conductor is recycled to the adsorption zone.

Abstract: The present invention discloses an exhaust gas catalyst for reducing the pollutant release containing in the exhaust gas. The catalyst includes a primary-core support carrier composed of gamma-phase aluminum oxide. The core-carrier is coated with Y.sub.2 O.sub.3 and ZrO.sub.2 such that the heat resistance is greatly improved. A two-layer active catalytic structure is formed over the core-carrier. An inner catalytic layer is formed with composition active catalytic elements with approximate weight ratios of La:Ce:Mn:Co:Pd:=10-15:10-15:6-10:6-10:0.1-0.3. An outer catalytic layer is then coated over the inner catalytic layer. The outer catalytic layer comprises catalytic active elements. The weight ratio of the active catalytic elements are Y:La:Zr:Cu:Cr:V:Pd:=1-3:2-6:2-6:6-10:10-15:2-6:0.1-0.3.

Abstract: A novel composite oxide has an A-site defect type perovskite structure represented by a general formula:A.sub.1--.alpha. BO.sub.3--.delta.wherein A is at least one element selected from the group consisting of alkali metals, alkaline earth metals, rare earth elements, Y and Pb, and B is at least one element selected from the group consisting of Ti, Mn, Fe, Co, Ni, Cu and Al, and .alpha. is 0<.alpha.<0.2 and .delta. is 0.ltoreq..delta..ltoreq.1, provided that only a known perovskite type oxide (La.sub.1-x Sr.sub.x).sub.1-.alpha. MnO.sub.3-.delta. (when .alpha. is 0.06, x is 0.08.ltoreq.x.ltoreq.0.30, while when the value of x is 0.11, .alpha. is 0.06<.alpha.<0.11) is excluded.

Abstract: A perovskite-type catalyst consists essentially of a metal oxide composition. The metal oxide composition is represented by the general formula A.sub.1-x B.sub.x MO.sub.3, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0.ltoreq.x<0.5.

Abstract: A perovskite-type catalyst consisting essentially of a metal oxide composition. The metal oxide composition is represented by the general formula A.sub.a-x B.sub.x M0.sub.b, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from Bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0.ltoreq.x<0.7. Methods for preparing the perovskite-type catalyst are also described.

Abstract: A catalyst for purifying exhaust gases of an automobile engine including a carrier coprecipitated with a material absorbing oxides of nitrogen (NO.sub.x) and an active noble metal wherein the material absorbing oxides of nitrogen is at least one of barium manganese oxide (BaMnO.sub.3) and calcium manganese oxide (CaMnO.sub.3). The carrier coprecipitated with BaMnO.sub.3 or CaMnO.sub.3 shows superior capacity for absorbing oxides of nitrogen. Consequently, a catalyst according to the present invention can effectively purify engine exhaust, even in a lean burn environment.

Abstract: A catalyst and a method for producing the catalyst, for catalytic reduction of NO.sub.x and oxidation of hydrocarbons, the catalyst comprises a zinc, copper and aluminum spinel to which, at least one element selected from palladium, platinum, rhodium, ruthenium, osmium, iridium, rhenium and/or rare earth metals, such as lanthanum and cerium, vanadium, titanium, niobium, molybdenum, tungsten and/or salts thereof and/or oxides thereof has been added.

Abstract: A compound having the formula Li.sub.q Cr.sub.x-y Ni.sub.y Mn.sub.2-x O.sub.4+z where q.gtoreq.2, 1.0.ltoreq.x.ltoreq.1.25, 0<y<0.9, and z.gtoreq.0. The invention also features an electrode composition containing this compound and processes for preparing a compound having the formula Li.sub.q Cr.sub.x-y Ni.sub.y Mn.sub.2-x O.sub.4+z where q.gtoreq.2, 1.0.ltoreq.x.ltoreq.1.25, 0<y<0.9, and z.gtoreq.0.

Abstract: An adsorbent exhibiting an excellent adsorption ability to nitrogen oxides (NO) is made from an oxide-based ceramics having an average crystallite grain size D in a range of D<500 .ANG., e.g., CeO.sub.2. A catalyst is formed from, for example, an cerium oxide (CeO.sub.2) and a zeolite. A content C of CeO.sub.2 in the catalyst is set in a range of 10% by weight .ltoreq.CA.ltoreq.80% by weight. The zeolite adsorbs hydrocarbon (HC). The hydrocarbon (HC) adsorbed is oxidized into active CHO which acts to reduce the nitrogen oxides (NO) adsorbed by the CeO.sub.2.

Abstract: The present invention generally relates to supported perovskites and their use for low temperature oxidation of volatile oxygen-containing organic compounds, particularly alcohols. The present invention further relates to the use of supported perovskites to reduce the amount of oxygen-containing organic compounds present in waste gases produced by processes such as baking or brewing.

Abstract: The amorphous perovskite structure catalysts according to the present invention comprise a carrier material and a mixture of at least two metal oxides supported thereon, which have the following formula:(M.sup.1.sub.a O.sub.x.M.sup.2.sub.1-a O.sub.y)(M.sup.3.sub.b O.sub.z.M.sup.4.sub.1-b O.sub.w)/Swherein M.sup.1 and M.sup.2 independently of each other are selected from the group consisting of the lanthanide metals, the alkali metals and the alkaline earth metals, M.sup.3 and M.sup.4 independently of each other are selected from the group consisting of the transition metals and the platinum metals, a and b are from 0 to 1, x, y, z and w are determined stoichiometrically on the values of a and b, the ratio of ?M.sup.1 +M.sup.2 ! to ?M.sup.3 +M.sup.4 ! is 0.1.about.3.0:1.0, and S is a carrier material. The process for preparing the amorphous perovskite structure catalysts comprises dissolving completely at least two salt solutions of metals, M.sup.1, M.sup.2, M.sup.3 and M.sup.

Abstract: The invention relates to catalysts for the treatment of combustion gases. The catalysts include an active phase of the perovskite having the general formula: L.sub.x L'.sub.1-x M.sub.y M'.sub.z .phi..sub.1-y-z O.sub.3, wherein L is an element selected from lanthanides and rare earths, L' is an element selected from a group consisting of Sr, Ca, Ba, Ce, K, Bi, Rb or Na; M is a transition metal selected from a group consisting of Cr, Mn, Fe, Co, Ni and Cu; M' is at least one metal selected from a group consisting of Pt, Ru, Pd, Rh; .phi. is a cationic lacuna; 0<x<0.5, 0.85<y.ltoreq.1, 0.ltoreq.z<0.08 with 0.85<y+z.ltoreq.1. The catalysts of the invention are particularly useful for purifying exhaust gas from diesel engines, particularly for the removal of soot.

Abstract: The NOx content of FCC regenerator flue gas is reduced using a spinel/perovskite additive which maintains activity during FCC operation in the presence of high levels of sulfur oxides and oxygen. Additionally, a stabilization component may be added to enhance catalytic stability of the additive, and a cracking component may be added under conditions of low reducing agents in the regenerator flue gas.

Abstract: An exhaust gas catalyst for reducing the pollutant release containing in the exhaust gas. The catalyst includes a primary-core support. The catalyst also includes a distributed-catalytically-active multi-combination catalyst structure formed on the primary core support. The multi-combination catalyst structure includes an outermost gas-contact combination which includes atoms of metals selected from platinum group atomically immersed in the micro-space between a plurality of crystalline structures of composite oxides of a plurality of catalytically active metals and intimately attached to and protected by the crystalline structures in a protective inner combination.

Abstract: The invention relates to a catalyst for the partial oxidation of methane or a gaseous mixture containing methane, said catalyst which preferably has a perovskite structure has the following composition:Ln.sub.x A.sub.1-y B.sub.y O.sub.3in which x is a number such that 0<x<10, y is a number such that 0<y<1, Ln is at least one element chosen from within the group formed by rare earths, strontium and bismuth and A and B are metals of groups IV b, V b, VI b and VIII of the periodic classification of elements.

Abstract: A catalyst for catalytic reduction of nitrogen oxide using at least one reducing agent selected from the group consisting of a hydrocarbon and an oxygen-containing organic compound is described, which includes an oxide represented by formula (V):A.sup.5.sub.x B.sup.3.sub.3-x C.sup.4.sub.3 O.sub.7 (V)wherein A.sup.5 represents at least one element selected from the group consisting of La, Y, Ce, Pr, Nd, Sm, Eu, and Gd; B.sup.3 represents at least one element selected from the group consisting of Ba, Sr, Ca, Mg, Pb, Zn, and Ag; C.sup.4 represents at least one element selected from the group consisting of Mn, Co, Fe, Ni, Cr, Cu, V, Mo, W, Ti, Zr, Nb, Pd, Rh, Ru, and Pt; and x is a number of from 0 to 1, supported on a solid acid carrier.

Abstract: The NOx content of FCC regenerator flue gas is reduced using a spinel/perovskite additive which maintains activity during FCC operation in the presence of high levels of sulfur oxides and oxygen. Additionally, a stabilization component may be added to enhance catalytic stability of the additive, and a cracking component may be added under conditions of low reducing agents in the regenerator flue gas.

Abstract: Perovskite materials have a composition of the formula La.sub.1-x Sr.sub.x Cr.sub.1-y Ru.sub.y O.sub.3 wherein 0.1.ltoreq.x.ltoreq.0.5 and 0.01.ltoreq.y.ltoreq.0.10. The materials are used in catalysts for carbon monoxide oxidation, unsaturated hydrocarbon oxidation and/or nitrogen oxide reduction.

Abstract: The present invention relates to rare earth complex oxide combustion catalysts wherein perovskite-type rare earth complex oxide active components are carried on a support using mullite as the main phase. The present invention relates also to a process for preparing a rare earth complex oxide combustion catalyst which comprises impregnating the support with the solution of the metallic ions prepared by the ABO.sub.3 stoichiometry and then drying and calcining it. Furthermore, the present invention relates to the use of the said catalyst as a combustion catalyst for CO in the fluid catalytic cracking (FCC) process of petroleum refining.

Abstract: For the preparation of a catalytic composite for purifying exhaust gases, first, at least one perov-skite-type compound oxide of the formula RMO.sub.3, where R is La or a combination of La and Ce, and M is Co, Mn or a combination thereof, is supported together with cerium dioxide and alumina sol on a heat resistant carrier made of an inorganic oxide selected from the group consisting of cordierite and mullite, and then iron and palladium are further supported together thereon. As a result, a catalytic composite having a high degree of oxidation activity at low temperatures and also having excellent heat resistance can be obtained.

Abstract: A non-precious metal three-way catalyst which reduces hydrocarbon, carbon monoxide, and nitrogen oxide from internal combustion engine exhaust and industrial emissions, with a conversion capability comparable to the conversion efficiencies of current precious metal catalysts, and with superior NO.sub.x conversion characteristics, and durable when operated under prolonged high temperature conditions. The light-off temperature is close to the light-off temperature of convertional precious metal catalysts. The active catalytic components in this catalyst are a mixture of rare-earth metal and non-noble metal oxides.

Abstract: There is provided a process for the partial oxidation of methane to produce a product including carbon monoxide and hydrogen. The process involves contacting a source of methane and a source of oxygen with a perovskite catalyst, such as LaCoO.sub.3.

Abstract: The present invention provides a process for producing a perovskite-type oxide catalyst. The process comprises the steps of reacting an aqueous solution containing plural metal salts, such as chloride, sulfate, nitrate, etc., and an aqueous solution of a neutralizer such as alkali carbonate, alkali hydroxide, ammonia, etc., so as to cause coprecipitation of neutral salts and firing the coprecipitated salts to provide a perovskite-type oxide. At least one organic substance selected from the group consisting of cellulose, polyvinyl acetate, polyethylene, polystyrene, polypropylene, polyvinyl alcohol, starch, gelatin and saccharide is added prior to the firing step. The addition of the organic substance makes possible the attainment of a highly active perovskite-type oxide catalyst composed of very fine particles (primary particles).

Abstract: A catalyst for the elimination of toxic substances in exhaust gases from combustion systems and internal combustion engines, having at least one layer of catalyst material, includes a catalyst material formed by at least one mixed oxide system, which has unsaturated ions on its surface that effect charge transfer processes. A method for manufacturing such a catalyst includes grinding dry carbonates or oxides of lanthanum, manganese, iron, copper and strontium in a defined ratio by weight for at least one hour, and sintering the powder mixture thus formed at 1300.degree. C. for forming the perovskite structure or the perovskite and spinel structure.

Abstract: An .alpha.-olefin polymerization catalyst which comprises a perovskite type complex compound comprising a perovskite type compound represented by the formulaABO.sub.3wherein A is at least one element selected from the group consisting of alkaline earth metals and Pb, and B is at least one element selected from the group consisting of Ti, Zr, Hf and Sn; the complex compound further containing at least one oxide of element selected from the group consisting of rare earth elements, transition elements, Bi, Sb and Sn doped in the perovskite type compound in an amount of 0.1-3 mol %.A composite material which comprises the catalyst having an .alpha.-olefin polymer deposited thereon, is useful as, for example, a dielectric ceramic material.

Abstract: A catalytic composite for purifying exhaust gases is disclosed which comprises ceramic fibers, oxidation catalysts supported on the surface of the ceramic fibers and in the interstices between the ceramic fibers, and inorganic binders for binding the oxidation catalysts to the ceramic fibers, the catalytic composite being provided with vent holes for the passage of exhaust gases. Also disclosed is a method for preparing the catalytic composite.

Abstract: A catalyst is used for removing toxic substances from the exhaust gases of combustion installations and internal combustion engines, by reduction with carbon monoxide, hydrogen, hydrocarbons or ammonia. The catalyst is produced using a single-phase or multi-phase mixed oxide system with a pure perovskite structure or a perovskite and spinel structure. To produce the catalyst, carbonates or oxides of lanthanum, strontium, manganese, iron and copper are mixed, crushed, dried and ground to a fine powder with a particle size between 0.1 and 5 microns. This powder is then processed to form a catalytically active layer.

Abstract: Novel oxidation-reduction catalysts and the method for their preparation. The materials comprise stable phases involving V.sub.2 O.sub.3 and TiO.sub.2 and mixtures of said phases and have compositions that fall within specific areas in a binary composition diagram of V.sub.2 O.sub.3 and TiO.sub.2. A typical VT material has the formula V.sub.2 TiO.sub.5. A typical E material has a formula V.sub.2 Ti.sub.2 O.sub.7 ; and, a typical .eta. material has the formula V.sub.2 Ti.sub.3 O.sub.9.

Abstract: There has thus been provided a highly efficient metal-ceramic catalytic combustor for a gas turbine/catalytic combustor assembly. The catalyst zone is formed of a high temperature resistant metal wire mesh, e.g., palladium coated tungsten or ferritic stainless steel screen, e.g., 40 mesh, which is aluminized with metallic aluminum, and heated to convert the outermost layer of aluminum to aluminum oxide and encourage the diffusion of the inner layer of aluminum into the body of the metal wire, desirably forming a thin metal/aluminum alloy layer. The outer surface because of the Kerkendall Effect is porous and readily accepts and strongly bonds to a metal oxide coat, e.g., a magnesia/alumina, or magnesia/alumina/yttria, or barium oxide/alumina, or barium oxide/alumina/yttria wash coat. There may also be included a catalyst deposited on the ceramic outer coat, e.g., a noble metal catalyst, for enhancement of the combustion of an air/fuel mixture.

Abstract: Improved process for making Tl-Ca-Ba-CuO superconductors. A solution of the monocarboxylates (e.g., acetates) of Ca, Ba, and Cu is dried, calcined, mixed with Tl.sub.2 O.sub.3, and the mixture is heated to make a superconductor. The method minimizes introduction of contaminants. Novel compositions result.

Abstract: This invention provides a composition comprising a mixture or a fired product of a material of the general formula Sr.sub.(1+x)/2 La.sub.(1-x)/2 Co.sub.1-x Me.sub.x O.sub.3-.delta. (wherein Me: at least one of Fe, Mn, Cr and V; O.ltoreq.x.ltoreq.1; .delta.: loss of oxygen) and SrMeO.sub.3 (wherein Me: at least one of Ti, Zr and and Hf), and a catalyst and a multi-functional sensor using such composition. With this composition it is possible to improve the catalytic performance for cleaning exhaust gas grom combusters or internal combustion engines and to improve sensitivity or response characteristics of the sensors for detecting stoichiometric composition.

Abstract: A method for producing uniform mixed metal oxides, such as superconducting mixtures including Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x, in which such metals are precipitated as their oxalates from alcoholic solutions of the metals as the salts of a carboxylic acid.

Abstract: Alkali metal doped double perovskites containing manganese and at least one of cobalt, iron and nickel are useful in the oxidative coupling of alkane to higher hydrocarbons.

Abstract: Perovskite related materials of high thermal stability and surface area which contain interspathic polymeric chalcogenides such as polymeric silica are prepared by ion exchanging a layered metal oxide, such as layered titanium oxide, with organic cation, to spread the layers apart. A compound such as tetraethylorthosilicate, capable of forming a polymeric oxide, is thereafter introduced between the layers. The resulting product is treated to form polymeric oxide, e.g. by hydrolysis, to produce the layered oxide material. The resulting product may be employed as catalyst material in the conversion of organic compounds.

Abstract: This invention provides a process for the preparation of the precursor used in the fabrication of Y--Ba--Cu--O superconductors. This process mainly uses solgel technology via the nitrate route by using a dicarboxylic acid. Among the dicarboxylic acids, oxalic acid is the best for preparing the precursor which can be fabricated into a good superconductor.

Abstract: In a catalytic cracking process which includes contacting a hydrocarbon feedstock in a contacting zone in the presence of solid composition containing molecular sieve-containing catalyst capable of promoting hydrocarbon cracking at conditions effective to crack the hydrocarbon feedstock to lower boiling components, the improvement comprising conducting the contacting in the presence of at least one metal component, other than the catalyst, containing calcium and tin. A composition of matter comprising such catalyst and metal component is also disclosed.

Abstract: A catalyst for purifying exhaust gases comprises: a perovskite-type complex oxide represented by the general formula Ln.sub.1-x A.sub.x MO.sub.3, wherein Ln represents at least one rare earth metal, A presents at least one alkaline earth metal and M represents at least one transition metal, and 0<x<1; at least one heat resistant complex oxide; and at least one precious metal. The heat resistant complex oxide is one of ABO.sub.3, LnAlO.sub.3 or Ln.sub.2 B.sub.2 O.sub.7, wherein A represents at least one alkaline earth metal, B represents at least one of Ti, Zr and Hf, and Ln represents at least one rare earth metal, and the precious metal is at least one of Pt, Pd, Rh, Ir, Ru and Os. The catalyst is usable as a temperature of 900.degree. C. or above without sintering or reduction of a catalytic activity.

Abstract: A process is disclosed for producing a homogeneous mixture of co-precipitated carbonate salts capable of reacting together in an oxygen atmosphere at an elevated temperature to form a superconducting ceramic which comprises forming a first solution by dissolving in a first solvent maintained at a temperature of from about 15.degree. to 35.degree. C. a rare earth compound, an alkaline earth metal compound, and a copper compound capable of reacting with a carbonate ion to form an insoluble precipitate of carbonate salts in the solvent used to form the solution; forming a second solution containing a carbonate-forming compound dissolved in a second solvent miscible with the first solvent; blending the first and second solutions together at a temperature of from about 0.degree. to 15.degree. C.

Abstract: A homogenous coprecipitation method by which superconducting oxides having perovskite-like structure, such as YBa2Cu307-x, can be produced in mass, in which urea is used as solvent to adjust and control the PH value of an aqueous nitrate solution. The coprecipitation method of this invention comprises following steps: (a) preparing an aqueous mixture containing Y, Ba and Cu salts with molar ratio of 1:2:3 wherein Y being 0.068M; (b) adding 5-10 moles of oxalic acid per one mole of Y and 20-250 moles of urea per moles of Y into the aqueous mixture; (c) heating the aqueous mixture to a temperature range of 80.degree. to 100.degree. C. to proceed a hydrolysis of the urea such that PH value of the aqueous mixture will be gradually elevated by NH.sub.3 gas evoluted from the urea hydrolysis; and (d) cooling the temperature of the aqueous mixture to room temperature at which time a desired uniform PH value is reached. After cooling, pale blue homogeneous coprecipitates of the superconducting oxides can be obtained.

Abstract: A process for producing barium titanates which comprises admixing a titanium alkoxide with a barium salt of a lower carboxylic acid in the presence of an organic solvent containing at least ethylene glycol monomethyl ether to provide a uniform mixture, bringing the mixture in contact with water to form a gelated product and drying and calcining the gelated product.

Abstract: A process for preparing compound metal oxides, a superconductive compound oxides for instance, is disclosed. The process comprises preparing an aqueous solution containing a predetermined content ratio of chloride, nitrate or acetate of a rare earth metal, an alkaline earth metal and copper, slightly basifying the solution to form hydroxides of the rare earth metal and copper and then introducing carbon dioxide to form carbonate of the alkaline earth metal, collecting the thus formed mixed precipitate of hydroxides and carbonate and firing it.

Abstract: A process for the preparation of copper oxide superconductors which comprises (1) mixing and grinding yttrium nitrate hydrate, copper nitride, and an oxidizing agent such as barium peroxide in a suitable solvent; (2) forming a paste thereof; (3) applying the paste to a substrate; (4) heating the substrate with the paste thereon; and (5) therafter cooling. The process yields copper oxide superconducting compounds in a purity of at least 80 percent.

Abstract: A process for the preparation of copper oxide superconductors which comprises (1) mixing copper nitride, an oxidizing agent such as barium peroxide, and yttrium oxide; (2) forming pellets of the aforementioned mixture; (3) heating the pellets; and (4) thereafter cooling the pellets. The process yields copper oxide superconducting compounds in a purity of from about 60 to over 95 percent.

Abstract: Improved process for the catalytic gas phase preparation of low molecular weight (C.sub.2-6) olefinic hydrocarbons from mixtures of H.sub.2 and CO, the improvement consisting of contacting and reacting a mixture of H.sub.2 and CO, at a H.sub.2 /CO molar ratio within the range 0.3 to 1.5, at a space velocity of 1 to 100 minutes.sup.-1, at a pressure of 1 to 2000 psia (6.894 kPa to 13.788 MPa), at a temperature within the range 200.degree. to 400.degree. C., in the presence of the catalyst of the empirical formula AB.sub.1-a Fe.sub.a O.sub.3, wherein A, B and a are defined herein, for example, LaFeO.sub.3.

Abstract: A catalyst for purifying exhaust gases contains: a catalyst support, a perovskite double oxide comprising at least one alkaline earth metal oxide, lathanum oxide and cerium oxide, carried on the catalyst support, and noble metal catalyst components carried on the catalyst support.The catalyst for purifying exhaust gases according to the present invention offers an improved durability and purifying ratios for carbon monoxide CO, hydrocarbons HC and nitrogen oxides NOx.

Abstract: The present invention involves a method for producing a variety of barium titanate based powder products consisting of submicron, dispersible primary particles having narrow size distributions. The method, in its broadest aspects, involves heating an aqueous slurry of PbO, or Pb(OH).sub.2, and Ca(OH).sub.2 with a stoichiometric excess of the hydrous oxides of Ti(IV), Sn(IV), Zr(IV) and Hf(IV) to a temperature not exceeding 200.degree. C. Thereafter, the resulting slurry temperature is adjusted to between 50.degree. and 200.degree. C. and a solution of Ba(OH).sub.2 and Sr(OH).sub.2, having a temperature of 70.degree. to 100.degree. C. is added within a period of five minutes or less to the slurry. About 10 minutes after the addition of the Ba(OH).sub.2 and Sr(OH).sub.2 solution is completed, the slurry is heated to a temperature not exceeding 225.degree. C. to ensure formation of a stoichiometric perovskite product. Thereafter, the slurry is cooled and the solid product is recovered.

Abstract: Organic-swelled layered metal chalcogenides, e.g., titanometallates or silicotitanates, are intercalated with polymeric chalcogenide, e.g., polymeric silica by treatment with organic hydrolyzable polymeric chalcogenide precursor wherein hydrolysis to polymeric chalcogenide is enhanced by removal of organic hydrolysis by-products, during hydrolysis, e.g., by exposure of the reaction mixture to elevated temperatures.