Abstract: A catalyst, for purifying an exhaust gas, contains at least one catalyst component from among Pt, Pd, Rh, Au, Ag and Ir, and a complex oxide of the perovskite type comprising at least two different metal elements. In the catalyst, the catalyst component is carried on the complex oxide.

Abstract: A microcrystalline boehmite containing additive in a homogeneously dispersed state. Suitable additives are compounds containing elements selected from the group consisting of alkaline earth metals, alkaline metals, rare earth metals, transition metals, actinides, silicon, gallium, boron, titanium, and phosphorus. The microcrystalline boehmite according to the invention may be prepared in several ways. In general, a microcrystalline boehmite precursor and an additive are converted to a microcrystalline boehmite containing the additive in a homogeneously dispersed state. The additive does not contain zirconia or magnesia.

Abstract: High activity, supported, nanosized metallic catalysts for methanol reformation and methods of fabricating such catalysts are disclosed. In one embodiment, soluble metal species are dissolved in a polyhydroxylic alcohol (polyol) solution. Platinum and ruthenium are preferred metal species. Other soluble metal species can be used, such as soluble Group 6, 7 and 8 metals. The polyol solvent is preferably a viscous alcohol, such as a diol, triol, or tetraol, to minimize particle diffusion and inhibit particle growth. The polyol solution is heated to reduce the metal(s) to a zero valent state. Typically, the heating temperature will range from 20° C. to 300° C., and the heating period will range from 1 minute to 5 hours. A high surface area conductive support material can be mixed with the polyol solution to form the supported catalysts in situ. Activated carbon, metals, and metal oxides, having a surface area from 20 to 2000 m2/g, are typical support materials.

Abstract: A selective catalytic material is used in a method for selective oxidation of carbon monoxide in the presence of hydrocarbons and contains rhodium and a bismuth component either as a supported catalytic material dispersed on a refractory inorganic oxide support or as an unsupported catalytic material prepared, for example, by co-precipitation from a solution containing dissolved bismuth and rhodium salts. The bismuth and rhodium components are present in amounts that provide an atomic ratio of bismuth to rhodium in the range of from about 0.1:1 to 10:1, e.g., from about 1:1 to 2.5:1. The selective catalytic material is contacted under oxidizing conditions with a gas stream containing carbon monoxide and hydrocarbons.

Abstract: Composite of at least two metal oxides in the form of Primary Particles and a support having a particle size greater than the Primary Particles used in the formation of a catalyst composition for the treatment of a pollutant containing gas.

Abstract: A hydrogenation catalyst for hydrocarbon oils containing aromatic hydrocarbons is provided. The catalyst has a silica-magnesia oxide carrier with a magnesia content within a range from 25 to 50 weight percent calculated in terms of the metal oxide, to which a noble metal selected from among the group VIII metals of the periodic table is added as the active component. In addition, the pore characteristics of the catalyst are such that the volume of pores with a pore size of at least 4 nm as measured by a mercury porosimetry method is within the range from 0.3 to 0.6 ml/g, the volume of pores with a pore size of at least 200 nm as measured by a mercury porosimetry method is no more than 0.05 ml/g, the volume of pores with a pore size from 0.7 to 2 nm as measured by nitrogen adsorption-t-plot method is within the range from 0.2 to 0.3 ml/g, and the volume of pores with a pore size from 2 to 4 nm as measured by nitrogen adsorption-DH method is within the range from 0.15 to 0.2 ml/g.

Abstract: An exhaust gas purifying catalyst for exhaust gas discharged from a lean-burn engine of an automotive vehicle. The catalyst comprises a refractory inorganic carrier. A catalytic layer is coated on the refractory inorganic carrier. The exhaust gas purifying catalyst layer contains platinum and at least one noble metal selected from the group consisting of palladium and rhodium, and a NOx trapping substance. In the catalytic layer, platinum exists close enough to the NOx trapping substance to accept NO2 from the NOx trapping substance which NO2 is produced according to reaction expressed by the following chemical equation: M(NO3)2→2NO2+3/2O2+MO where M is the NOx trapping substance.

Abstract: A catalyst and a process for using the catalyst are disclosed generally for the conversion of hydrocarbons. By the use of at least one high temperature calcination under dry conditions, a catalyst with a beneficial combination of lowered surface area and excellent piece crush is created. X-ray diffraction pattern information is used to distinguish the resulting product.

Abstract: An improved catalyst including a compound of the formula (I) AaMmNnXxOo  (I) wherein 0.25<a<0.98, 0.003<m<0.5, 0.003<n<0.5, 0.003<x<0.

Abstract: A suspension, dispersion or emulsion is introduced into a burner. An optionally two-stage after-treatment is then carried out. The resulting powder can be employed as a catalyst.

Abstract: A process for preparing a catalyst, the catalyst itself, and a process for using the catalyst are disclosed generally for the conversion of hydrocarbons. By the use of at least one high temperature calcination under substantially dry conditions, a catalyst with a beneficial combination of lowered surface area and excellent piece crush is created. X-ray diffraction pattern information is used to distinguish the resulting product.

Abstract: A catalyst comprising at least one support, at least one element from groups 8, 9 or 10 of the periodic table, at least one element from group 14 of the periodic table, at least one element from group 13 of the periodic table, at least one alkali or alkaline-earth metal, and, optionally, at least one halogen in an amount in the range from 0 to 0.2% by weight with respect to the total catalyst weight, the catalyst being characterized in that the accessibility of the element from groups 8, 9 or 10 is more than 50%. The invention also concerns a process for preparing a catalyst and the use of the catalyst in a process for dehydrogenating paraffins containing 3 to 22 carbon atoms per molecule.

Abstract: A noble metal alloy composition for a fuel cell catalyst, a ternary alloy composition containing platinum, ruthenium and palladium. The alloy shows increased activity as compared to well-known catalysts.

Abstract: An ordinary-temperature purifying catalyst includes an oxide having an oxygen defect introduced by a reduction treatment, and a noble metal loaded on the oxide. For example, the oxide can be at least one oxide selected from the group consisting of cerium oxides and zirconium oxides, at least a part of which has an oxygen defect. The catalyst can purify an environmental loading material, such as carbon monoxide, a nitrogen oxide, ethylene, formaldehyde, trimethylamine, methyl mercaptan and acetaldehyde, in air at an ordinary temperature. A method for how to use the catalyst is also disclosed.

Abstract: A catalytic apparatus for exhaust purification, provided in an exhaust path of an internal-combustion engine operable with at least a theoretical air-fuel ratio and a lean air-fuel ratio, is provided with a three-way catalyst (4) having an inner layer (12a) thereof mainly containing rhodium as a noble metal to be activated in an oxygen concentration lowering atmosphere and a surface layer (12b) thereof mainly containing platinum or palladium as a noble metal to be activated in an oxygen concentration increasing atmosphere. In the catalytic apparatus, platinum or palladium in the surface layer is activated in lean operation to perform an HC purifying function effectively. If oxygen is temporarily in short supply during the change from a lean air-fuel ratio of exhaust gas over to a stoichiometric air-fuel ratio, oxygen is supplemented to purify HC by utilizing the O2 storage function of platinum or palladium as the noble metal, whereby the HC purifying rate can be prevented from temporarily suddenly lowering.

Abstract: The invention concerns the preparation of a catalyst comprising a support comprising at least one oxide of the element Si, Al, Ti, Zr, Sn, Zn, Mg or Ln (where Ln is a rare earth), cobalt, titanium, at least one element A selected from the group formed by copper, ruthenium, platinum, palladium, scandium and yttrium, and characterized in that it comprises at least the following successive steps: (1) forming a precursor comprising at least cobalt, element A and the support; (2) at least partial reduction of said precursor in the presence of at least one reducing compound; and (3) depositing titanium on the reduced precursor. The invention also concerns the catalyst which can be produced using this process and the use of the catalyst in a process for synthesising C5+ hydrocarbons from synthesis gas.

Abstract: A catalyst composition and method for oxidizing fuels is disclosed. The catalyst composition comprises at least one compound having one of a group III, group IIA or Lanthanide element such as, for example, Aluminum, Magnesium or Cesium, and at least one compound having at least one element selected from group IA, group IVA, groupVl, group VII, group VIII, group IB, group IIB, and combinations thereof, such as, for example platinum, rhodium and rhenium. A method for oxidizing an fuel, the method comprising providing a fuel and a catalyst mixture; transporting the fuel and the catalyst to the flame zone separately; mixing the fuel and the catalyst; and oxidizing the fuel. The method and catalyst mixture may be used for oxidation of any hydrocarbon based fuel. Improved results from the use of the group III, group IIA or Lanthanide group element include increased power, reduced harmful emissions, and smoother oxidation process.

Abstract: A powdered catalyst material based on aluminum oxide, which contains at least one basic metal oxide and at least one noble metal from the platinum group of the Periodic Table of Elements in addition to aluminum oxide. The catalyst material is obtainable by loading a support material already stabilized by basic oxides by renewed impregnation with further basic oxides. After drying and calcining this post-impregnated material at temperatures below 800° C., the catalytically active noble metals are also incorporated into the support material by impregnation.

Abstract: A composition comprises a hydrogenation catalyst supported on an inorganic support which comprises aluminum, zirconium, and a borate. A process for producing the composition comprises the steps of (1) contacting an aluminum salt, a zirconium salt, and an acidic boron compound under a condition sufficient to effect the production of a solid material comprising aluminum, zirconium, and borate; and (2) combining a hydrogenation catalyst with the inorganic support. Also disclosed is a process for reducing aromatic compounds content in a hydrocarbon-containing fluid which comprises contacting a hydrocarbon-containing fluid, in the presence of a catalyst composition, with hydrogen wherein said catalyst composition comprises a hydrogenation catalyst and an inorganic support wherein said support comprises aluminum, zirconium and a borate.

Abstract: For transforming hydrocarbons into aromatic compounds, the reaction is conducted on a homogeneous bed of catalyst particles, said catalyst comprising at least one amorphous matrix, at least one noble metal, at least two additional metals M1 and M2 and at least one halogen, and in which, for a catalyst particle, Cpt is the local concentration of platinum; CM1 is the local concentration of additional metal M1; CM2 is the local concentration of additional metal M2; in which the standard deviation of the distribution of the local ratios of the concentrations of the additional metals, CM1/CM2, measured along the particle diameter, is better than 25% relative.

Abstract: An exhaust gas purifying catalyst comprises a hydrocarbon adsorbent layer containing zeolite as a main component and a metal-based catalyst layer containing any noble metal such as palladium, platinum, rhodium, etc. on a monolithic support that has a plurality of cells whose sectional shape is a regular N-polygon. In the case that Rc is a distance from a center of gravity to an inner wall surface of the hydrocarbon adsorbent layer along a line extending from the center of gravity of the regular N-polygon in the cell sectional shape to a corner of the N-polygon, and Rf is a distance from the center of gravity to the inner wall surface of the hydrocarbon adsorbent layer along a line extending from the center of gravity perpendicularly to respective sides of the regular N-polygon, a ratio Rc/Rf is set to less than or equal to 1.7 in a cell sectional shape.

Abstract: A noble metal composite colloid composed of a plurality of noble metals is constructed to be loaded on a porous oxide support. The noble metals are loaded in particles which are larger than the conventional grains in the atomic state. Thus, vapor pressure decreases and volatile components, such as PtO2, are suppressed from dislocation or diffusion. In addition, affinity of the noble metals with the support is improved, and are suppressed from moving on the support. Thus, nobel metal grain growth is suppressed, decreases in catalytic activity is minimized and durability is improved.

Abstract: A high-activity hydrotreating catalyst containing a uniformly dispersed active component at a high concentration, and particularly useful for deep desulfurization of a hydrocarbon oil for its high hydrodesulfurization activity. The present invention also provides a hydrotreating process using the same catalyst.

Abstract: A method, system and catalysts for improving the yield of syngas from the catalytic partial oxidation of methane or other light hydrocarbons is disclosed. The increase in yield and selectivity for CO and H2 products results at least in part from the substitution of H2S partial oxidation to elemental sulfur and water for the combustion of light hydrocarbon to CO2 and water.

Abstract: An exhaust gas purifying catalyst contains a NOx absorbing component which comprises at least one kind of element selected from a group of alkaline earth metals, a group of alkaline metals and a group of rare earth elements and a component, other than the NOx absorbing component, selected between K and Na. The catalyst has a such a structure that the component other than the NOx absorbing component is brought into contact with an exhaust gas before the NOx absorbing component is brought into contact with the exhaust gas.

Abstract: Catalyst activation of a platinum reforming catalyst system contained in a multiple reactor system by simultaneously reducing the catalyst with a sustained hydrogen flow through the multiple reactor system while introducing a nonmetallic chlorine-containing compound serially into each reactor of the multiple reactor system in an amount to provide from about 0.05 to about 0.3 weight percent chlorine on the catalyst and thereafter purging the system with about 100 to about 50,000 cubic feet of hydrogen per cubic foot of catalyst prior to commencing use of the treated catalyst system for reforming hydrocarbon feed.

Abstract: A nitrogen oxide storage catalyst which contains at least one catalyst material and at least one nitrogen oxide storage component from the group of alkali and alkaline earth metals. The nitrogen oxide storage component, after completing catalyst preparation, is present as finely divided barium sulfate, strontium sulfate, a mixture or mixed crystals of the two sulfates, or as their complete or incomplete decomposition product with an average particle size of less than 1 &mgr;m. Barium sulfate and/or strontium sulfate act as feed materials for the active storage component in the storage catalyst according to the invention. As a result of the reductive exhaust gas compositions occurring under normal automobile driving conditions barium sulfate and strontium sulfate decompose to compounds which are able to store nitrogen oxides. This compensates for the loss of active storage components which occurs due to aging.

Abstract: Catalyst activation of a platinum reforming catalyst system contained in a multiple reactor system by simultaneously reducing the catalyst with a sustained hydrogen flow through the multiple reactor system while introducing a nonmetallic chlorine-containing compound serially into each reactor of the multiple reactor system in an amount to add from about 0.05 to about 0.3 weight percent chlorine to the catalyst and thereafter purging the system with about 100 to about 50,000 cubic feet of hydrogen per cubic foot of catalyst prior to commencing use of the treated catalyst system for reforming hydrocarbon feed.

Abstract: Catalysts for the fluid-bed hydrodechlorination of carbon tetrachloride to chloroform having high catalytic stability and comprising platinum supported on microspheroidal gamma alumina, characterized in that the platinum is in the form of particles dispersed throughout the mass of the support.

Abstract: A device (catalytic converter) for purifying an exhaust gas. This device has a first catalyst for purifying a NOx of the exhaust gas. This first catalyst contains first and second powders. The first powder has a porous carrier and at least one noble metal loaded on the porous carrier. The at least one noble metal is selected from platinum, palladium and rhodium. The second powder has a first double oxide represented by the general formula (Ln1-&agr;A&agr;)1-&bgr;BO&dgr; where &agr; is a number that is greater than 0 and less than 1, &bgr; is a number that is greater than 0 and less than 1, &dgr; is a number that is greater than 0, Ln is at least one first element selected from La, Ce, Nd and Sm, A is at least one second element selected from Mg, Ca, Sr, Ba, Na, K and Cs, and B is at least one third element selected from Fe, Co, Ni and Mn. The device is improved in capability of purifying NOx contained in an oxygen rich exhaust gas.

Abstract: The invention is especially directed to a system for purifying exhaust gases of diesel or gasoline engines containing on average an excess of oxygen, this system including three operational units being an oxidation catalyst (3), a particle separator (4), and an NOx adsorption catalyst (5), this system reducing the amount of hydrocarbons, carbon monoxide, nitrogen oxides and particles present in exhaust gas. The invention is also directed to methods for purifying exhaust gases.

Abstract: Hydrorefining catalyst contains 0.1 to 25 wt % in total of at least one hydrogenation active metal element selected from elements of Group 6, Group 8, Group 9, and Group 10 of the Periodic Table, and 0.1 to 3 wt % potassium on a carrier formed of porous inorganic oxide. The concentration distribution of the hydrogenation active metal element is higher in the central part than in the peripheral part of the catalyst, and the concentration distribution of potassium is higher in the peripheral part than in the central part of the catalyst. The pores on the outside surface of the catalyst are not plugged by the metal content of hetero compounds and hetero compounds can be efficiently diffused to inside the catalyst. As a result, long-term retention of a state of high activity is possible.

Abstract: Disclosed is a process for opening naphthenic rings of naphthenic ring-containing compounds, and catalysts which can be used in that process. The naphthene ring opening catalyst is a polymetallic catalyst comprising Group VIII metals. In a preferred embodiment the naphthene ring opening catalyst comprises Ir in combination with a Group VIII metal selected from at least one of Pt, Rh, and Ru, in an amount effective for opening a naphthene ring-containing compound at a tertiary carbon site.

Abstract: A process for producing a catalytic converter utilizes deposition of a catalytically active material electrochemically deposited on a substrate as aresult of the substrate being immersed in an electrolyte, which contains the catalytically active material, and an electric voltage being applied between the substrate and a counterelectrode. The platinum is deposited on a metallic substrate from a platinum-containing sulphuric acid solution, or in which process a Pt/Ru mixture is deposited on a metallic substrate from a sulphuric acid solution containing platinum and ruthenium as catalytically active material, which a Pt:Ru ratio of from 1:10 to 1:20.

Abstract: Disclosed are alumina particles with a dispersed noble metal. The alumina particles are hollow-structured alumina particles which comprise alumina as a major component of the matrix, and in which at least one noble metal is dispersed in the alumina matrix and/or on the surface of the alumina particles with a dispersion degree of 10% or more when being measured by the CO adsorption method. The noble metal dispersion degree is so high that the alumina particles are suitable for making a catalyst. The resulting catalyst exhibits the purifying performance, which hardly differs before and after a high temperature durability test, and is extremely good in terms of the durability.

Abstract: A catalyst for purifying an exhaust gas includes a composite oxide support and a platinum structural layer. The composite oxide support has a spinel structure expressed by M.Al2O4 in which M is an alkaline-earth metal. The platinum structural layer is formed on a surface of the composite oxide support and includes a matrix composed mainly of an alkaline-earth metal oxide in which platinum clusters are dispersed uniformly. A composite oxide layer can be interposed between the composite oxide support and the platinum structural layer. Also disclosed is an optimum process for producing the catalyst.

Abstract: The object of the present invention is to improve the catalyst performance of a ceramic support that enables a catalyst component to be loaded directly, prevent thermal degradation and so forth, and enhance durability.

Abstract: A highly functional material characterized in that a photocatalyst comprising fine particles of rutile type titanium dioxide strongly supporting ultra-fine metal particles selected from the group consisting of Pt, Au, Pd, Rh, Pu and Ag with a particle diameter of 1 nm to 5 nm by firing treatment so as to exhibit a quantum tumbling effect of electron between the metal particles and the rutile type titanium dioxide and the photocatalyst is scattered on a surface of the base material so as to be irradiated by a light with wavelength smaller than about 407 nm.

Abstract: A catalyst comprising at least one metal of the 10th group of the Periodic Table of the Elements and at least one metal of the 11th group of the Periodic Table of the Elements on an aluminum oxide support, wherein the metal or metals of the 10th group is or are essentially concentrated in an outer layer close to the surface of the catalyst particle, the metal or metals of the 11th group is or are distributed essentially uniformly over the volume of the catalyst particle and the weight ratio of the metal or metals of the 11th group to the metal or metals of the 10th group is not more than 1.95.

Abstract: The invention pertains to a process for preparing an activated catalyst, to the activated catalyst composition and the use thereof in the conversion of hydrocarbon feedstocks, such as isomerisation. The catalyst composition comprising a Group VIII noble metal and a hydrocarbon-substituted aluminum compound on an alumina carrier is activated by contacting it with an inert gas in the absence of hydrogen at a temperature above 400° C., wherein at least when the hydrocarbon-substituted aluminum compound is a non-halide hydrocarbon-substituted aluminum compound, the catalyst composition is contacted with a halogen-containing gas either prior to the treatment with the inert gas or during the treatment with the inert gas, and subsequently cooling down the activated catalyst to ambient temperature in an inert gas optionally containing hydrogen or containing, at a temperature below 400° C.

Abstract: The present invention relates to a novel hydrophobic multicomponent catalyst useful in the direct oxidation of hydrogen to hydrogen peroxide and to a method for the preparation of such catalyst. More specifically, this invention relates to a novel hydrophobic muticomponent catalyst comprising a hydrophobic polymer membrane deposited on a Pd containing acidic catalyst, useful for the direct oxidation of hydrogen by oxygen to hydrogen peroxide, an a method for preparing the same.

Abstract: An exhaust gas purifying catalyst including a catalyst component containing a refractory inorganic oxide carrying a platinum family metal, a nitrogen oxide adsorbent, and a hydrocarbon adsorbent and a catalyst component for the purification of nitrogen oxide and a method for the purification of an exhaust gas by the use of the catalyst.

Abstract: A process for preparing a catalyst which has a catalytically active coating of high surface area finely divided materials and catalytically active components on an inert carrier structure. A powder mixture of the finely divided materials used is impregnated with a solution of precursor compounds of the catalytically active components. By suitable combination of the finely divided materials and the precursor compounds and appropriate management of the impregnation process, a highly dispersed deposition and adsorption of the catalytically active components is ensured on the finely divided materials. Then ai aqueous coating dispersion is produced using the impregnated powder mixture and the carrier structure is coated therewith. The coating is then dried and calcined.

Abstract: A process for producing a catalyst body includes spraying an aluminum hydroxide and a metallic aluminum simultaneously but separately onto a support body. In the process, the aluminum hydroxide is thermally converted into an aluminum oxide. In addition, an aluminum/silicon compound is thermally sprayed onto the support body at the same time as but separately from the metallic aluminum, and a metallic active component is supplied. Such a catalyst body produced is suitable, in particular, for breaking down pollutants in a temperature range that lies above 400° C. A catalyst body includes the support body and an active compound thermally sprayed thereon. The active compound includes metallic aluminum, an aluminum oxide, an aluminum/silicon compound, and a metallic active component. The active compound is produced by the separate and simultaneous thermal spraying of the metallic aluminum and the aluminum/silicon compound.

Abstract: Catalyst activation of a platinum reforming catalyst system contained in a multiple reactor system by simultaneously reducing the catalyst with hydrogen while introducing a nonmetallic chlorine-containing compound into a reactor of the multiple reactor system in an amount to provide from about 0.05 to about 0.3 weight percent chlorine on the catalyst and thereafter purging the system with about 100 to about 50,000 cubic feet of hydrogen per cubic foot of catalyst resulting in a reforming system having increased activity and providing enhanced RON values with reduced cracking of feedstock.

Abstract: A catalyst for purifying an exhaust gas includes a support and a noble metal loaded on the support. The support includes a mixture containing a porous oxide and a composite oxide. The composite oxide is expressed by the following formula: (Al2O3)a(CeO2)b(ZrO2)1−b in which the values “a” and “b” are molar ratios and the value “a” falls in a range of from 0.4 to 2.5 and the value “b” falls in a range of from 0.2 to 0.7. The support includes a particle having a particle diameter of 5 &mgr;m or more in an amount of 30% by volume or more. With the thus arranged support, even when the catalyst is subjected to such a severe durability test that it is heated at 1,000° C. for 10 to 20 hours, it exhibits a high purifying activity, and its coating layer is inhibited from cracking or coming off.

Abstract: Catalyst activation of a platinum reforming catalyst system contained in a multiple reactor system by simultaneously reducing the catalyst with a sustained hydrogen flow through the multiple reactor system while introducing a nonmetallic chlorine-containing compound serially into each reactor of the multiple reactor system in an amount to provide from about 0.05 to about 0.3 weight percent chlorine on the catalyst and thereafter purging the system with about 100 to about 50,000 cubic feet of hydrogen per cubic foot of catalyst prior to commencing use of the treated catalyst system for reforming hydrocarbon feed.

Abstract: Catalyst activation of a platinum reforming catalyst system contained in a multiple reactor system by simultaneously reducing the catalyst with hydrogen while introducing a nonmetallic chlorine-containing compound into a reactor of the multiple reactor system in an amount to provide from about 0.05 to about 0.3 weight percent chlorine on the catalyst and thereafter purging the system with about 100 to about 50,000 cubic feet of hydrogen per cubic foot of catalyst resulting in a reforming system having increased activity and providing enhanced RON values with reduced cracking of feedstock.

Abstract: A process for the preparation of a catalyst useful for conducting carbon monoxide hydrogenation reactions, particularly Fischer-Tropsch reactions; the catalyst compositions, use of the catalyst compositions for conducting such reactions, and the products of these reactions. The steps of the process for producing the catalyst comprise impregnating a powder, or particulate refractory inorganic oxide solids, preferably silica, with a) a soluble compound or salt of a catalytic metal of the Iron Group, preferably cobalt, and b) a soluble compound, or salt, of a Group VIII noble metal, preferably platinum, suitably by sequential contact of the solids with a solution of (a) and a solution of (b), by sequential contact of the solids with a solution of (b) and a solution of (a), or by contact with a solution which contains both (a) and (b).

Abstract: The composite oxide and the composite oxide carrier are manufactured by the precursor forming step and firing step. The composite oxide catalyst is obtained by preparing a composite of catalytic components simultaneously with the formation of the precursor of composite oxide in the step of forming the precursor of composite oxide. The composite oxide and the composite oxide carrier are composed of a composite oxide in which at least one of cerium and zirconium, and aluminium disperse with extremely high homogeneity. With this structure, the heat resistance of the carrier is improved and consequently, enlargement of particles of the composite oxide defining the carrier, and sintering of adjacent particles of the composite oxide can be restrained, whereby the catalyst using the composite oxide carrier in accordance with the present invention is excellent in heat resistance.