Showing papers on "Catalyst support published in 1978"

Multiple-stage catalytic reforming with gravity-flowing dissimilar catalyst particles

Abstract: A multiple-stage catalytic conversion system in which a hydrocarbonaceous charge stock and hydrogen flow serially through a plurality of catalytic reaction zones in each of which the catalyst particles are movable via gravity flow. Dissimilar catalyst particles are utilized in the reactor systems which share a common regenerating tower through which the catalyst particles are downwardly movable via gravity flow and in which the catalyst particles are regenerated in segregated fashion. Dissimilarity of the catalyst particles stems from a difference in activity, stability and selectivity characteristics. In turn, this difference may be attributed either to physical, or chemical distinctions between the two composites, or both.

Metal catalyst support

Abstract: The catalyst support is a spiral formed by winding a single strip of metal upon itself. Indentations in the strip maintain a uniform spacing between the layers in the spiral. Heretofore this uniform spacing has been obtained only by winding a double layer of two strips, one flat and one corrugated.

Platinum, rhodium, and palladium catalyst for automotive emission control

Abstract: A three-way layered catalyst for use in a stoichiometric air/fuel ratio system comprising an alumina support having deposited thereon the catalyst materials platinum, palladium and rhodium and having a first layer of platinum positioned at the support surface, a second layer of catalyst material selected from the group consisting of rhodium and a mixture of palladium and rhodium adjacent to and radially inward of the first layer with palladium inward of and adjacent to said second layer where the catalyst material of such layer is rhodium Cerium oxide may be added to the support for improved performance

Rare earth and platinum group metal catalyst compositions

Abstract: A catalyst composition comprising a composite of ceria, lanthana, and alumina and a catalytically-effective amount of one or more platinum group metals deposited on the composite is disclosed. The composite is prepared by depositing a cerium compound on a calcined admixture of the lanthana and the alumina and calcining the composite. The catalyst is capable of operating in the combustion of carbonaceous fuel at high temperatures, e.g., greater than 2400° F. (1317° C.), for extended periods of time such as 20 hours with low emissions of carbon monoxide and nitrogen oxides.

Olefin oxidation catalyst and process for its preparation

Abstract: This invention provides an improved catalyst for vapor phase oxidation of propylene or isobutylene to the corresponding acrolein or methacrolein product. In a preferred embodiment, the oxidation catalyst corresponds to the formula: Mo.sub.12 Ni.sub.6 Bi.sub.1.5-2.5 Co.sub.2 Fe.sub.2 Sb.sub.2 Zn.sub.0.3 -0.8K 0 .4 -2O x This invention further provides a method of preparing the improved oxidation catalyst which in one important aspect of the preparation involves controlling the pH of an aqueous slurry admixture of catalyst components within the range of about 1-5.

Process for forming multicomponent oxide complex catalysts

Abstract: Process for forming multi-component oxide catalysts. According to the. invention the key catalytic phase of the catalyst is preformed and the elements of the host-catalyst phase are added together or separately. The key catalytic phase contains a molybdate or a tungstate of Bi, Te, Sb, Sn Cu or mixtures thereof. A representative catalyst is In the production of this catalyst a preformed bisrnuth molybdate slurry is added to a hoat-catalyst slurry. The mixture was then dried, calcined, ground and calcined once again.

High surface area catalysts

Abstract: High surface area metal-containing catalysts are prepared by dispersing a thermally decomposable metal compound in a hydrocarbon oil having a Conradson carbon content of up to about 50 weight percent, the thermally decomposable metal compound being added in an amount sufficient to obtain a specified ratio of atoms of Conradson carbon of the oil chargestock to atoms of metal constituent of the thermally decomposable compound, heating the compound in the presence of a gas comprising either hydrogen or hydrogen sulfide or hydrogen and hydrogen sulfide to form a solid high surface area catalyst within the oil, and recovering the resulting high surface area catalyst. The metal constituent of the thermally decomposable metal compound may be a metal of Groups II, III, IV, V, VIB, VIIB, VIII or mixtures thereof. The high surface area solids are suitable as catalysts, catalyst supports or catalyst components for use in hydrocarbon treating processes and in chemical processes.

Catalyst for manufacturing amines from alcohols

Abstract: A catalyst for implementing a process for manufacturing amines from alcoh is composed of an active element in the transition metals family uniformly combined with a refractory porous structure with a specific surface of between 10 and 300 m2 /g and with a pore diameter less than 5000 A. A stabilizer in the form of a sodium-based compound with a sodium content of 0.15 to 20% by weight relative to the weight of the catalyst, and a promoter in the form of a rhodium-based compound with a maximum rhodium content of 0.1% by weight relative to the weight of the catalyst, may be associated with the active metal. The catalyst and the process are applicable to the ethanolamine-ammonia reaction with a view to producing ethylenediamine, piperazine, and useful byproducts.

Hydrogen regeneration of coke-selectivated crystalline aluminosilicate catalyst

Abstract: A method is provided for regeneration of a catalyst comprising a crystalline aluminosilicate zeolite characterized by a silica to alumina mole ratio of at least about 12, a constraint index, as hereinafter defined, within the approximate range of 1 to 12, which catalyst has undergone controlled precoking by exposing the same to a thermally decomposable organic compound at a temperature in excess of the decomposition temperature of said compound but less than about 1200° F., at a hydrogen to organic compound mole ratio of between 0 and 1 to deposit at least about 1 weight percent coke thereon, such precoked catalyst having been deactivated by formation of a carbonaceous deposit thereon as a result of use of the same in catalytically converting an organic charge under conditions less severe, i.e., at a lower temperature and/or a higher hydrogen concentration than those employed during said precoking which comprises contacting the aged catalyst with an atmosphere comprising hydrogen at a temperature between about 800° F. and about 1200° F. and a pressure between about 0 and about 2000 psig for a period of time sufficient to at least partially restore the activity of the catalyst.

Method of preparing an alumina catalyst support and catalyst comprising the support

Abstract: A catalyst support is prepared by grinding a calcined alumina to a powder, compacting the powder at an elevated pressure, recracking the compressed powder to a predetermined size particle and acid extracting the particle. The support can be composited with catalytic components such as hydrogenation components and/or zeolites and used in a variety of hydrocarbon treating processes, such as hydrorefining, hydrodesulfurization, hydroconversion, reforming, and catalytic cracking.

Alumina, a method for its preparation and said alumina as carrier containing catalysts

Abstract: Process for controlling the porosity of aluminas during the preparation thereof; by forming by extrusion of alumina in the presence of an organic solvent such as an alcohol. The aluminas so prepared are suitable for use as catalyst or preferably as catalyst carriers.

Process of regenerating a noble metal catalyst used in the reduction of organic nitro compounds

Abstract: Noble metal catalysts are regenerated according to a process comprising the steps of washing the deactivated catalyst with a polar organic solvent; contacting the washed catalyst with a hot aqueous alkali metal hydroxide solution; contacting the catalyst with an oxygen-containing gas at moderately elevated temperatures; and washing the catalyst a final time with a polar organic solvent. This method of regenerating the catalyst is particularly useful to reactivate palladium on carbon catalysts deactivated in the reduction of nitrophenol compounds to aminophenols.

Method for regeneration and activity improvement of syngas conversion catalyst

Abstract: A method is disclosed for the treatment of single particle iron-containing syngas (synthes.s gas) conversion catalysts comprising iron, a crystalline acidic aluminosilicate zeolite having a silica to alumina ratio of at least 12, a pore size greater than about 5 Angstrom units and a constraint index of about 1-12 and a matrix. The catalyst does not contain promoters and the treatment is applicable to either the regeneration of said spent single particle iron-containing catalyst or for the initial activation of fresh catalyst. The treatment involves air oxidation, hydrogen reduction, followed by a second air oxidation and contact of the iron-containing single particle catalyst with syngas prior to its use for the catalytic conversion of said syngas. The single particle iron-containing catalysts are prepared from a water insoluble organic iron compound.

Heterogeneous Catalysis by Optically Selective Surfaces

Abstract: Addition of promoters to heterogeneous catalysts in order to influence the overall selectivity favorably is a tradition in catalyst development. Well-studied examples include Fisher-Tropsch catalysis and mixed metal catalysts of the refining industry. The modification of metal surfaces to yield optically selective hydrogenation catalysts represents a relatively recent development in this tradition. This review concerns the synthesis of such catalysts, their reported selectivities versus preparation conditions (promoter o r modifier loading, temperature and pH of modification, etc.), and an attempted semiquantitative model, derived largely from IR and electrochemical studies, which may rationalize the corresponding catalyst selectivity variations.

Process for preparing oxidation catalysts

Abstract: A process for preparing an attrition resistant molybdenum-containing oxidation catalyst comprising; heat-treating the active catalytic components in an oxidizing atmosphere at a temperature in excess of 175° C.; refluxing the heat-treated oxide catalyst in an aqueous slurry of the required amount of support material; ball milling the resulting catalyst mixture; and subjecting the ball milled catalyst to a second heat-treating step in an oxidizing atmosphere, at a temperature in excess of 200° C.

Catalyst for purifying exhaust gas from an internal combustion engine

Abstract: A catalyst support characterized by having a total pore volume ranging 0.05-0.5 cc/g. an average pore diameter ranging from 0.05-5μ and consisting mainly of α-alumina; and an internal combustion engine exhaust gas purifying catalyst made of said catalyst support carrying a catalytic agent.

Process for the conversion of carbon monoxide

Abstract: A process for the conversion of carbon monoxide in synthesis gas mixtures to hydrogen and CO 2 utilizes a catalyst which is active in the presence of sulfur compounds, and which comprises the oxides or sulfides of cobalt and molybdenum, supported on a shaped, relatively high surface area aluminous carrier. The carrier is stabilized by admixture with one or more rare earth metal oxides while the alumina is in the hydrated condition. The mixture of hydrated alumina and rare earth metal oxide is formed into a desired shape and calcined to convert the hydrated alumina to the oxide. Thereafter, the calcined, high surface area alumina is impregnated with the desired salts of cobalt and molybdenum and the impregnated catalyst is thereafter calcined and placed into service. The stabilized catalyst exhibits good activity at relatively low temperatures with synthesis gas mixtures containing sulfur compounds and retains its surface area and the aluminous carrier is not converted over to the alpha phase.

Catalyst for the oxidation of methanol to formaldehyde and a method of preparing the catalyst

Abstract: Catalyst for the oxidation of methanol to formaldehyde usable in the fluidized form in said oxidation, comprising iron and molybdenum oxides on a granular support, said support being a silica or an alumina having a specific surface area not exceeding 1 m2 /g and an overall pore volume not exceeding 0.2 ml/g and said oxides being present in the catalyst in an amount not exceeding 2 parts by weight for each 100 parts by weight of the support and in an atomic ratio between molybdenum and iron of from 1.5:1 to about 2.5:1.

Sulfur oxides control in cracking catalyst

Abstract: In removing sulfur oxides from flue gas in a cracking catalyst regenerator in the presence of a silica-containing particulate catalyst by reacting the sulfur oxides with alumina in a particulate solid other than the catalyst, activity loss in the alumina as a result of migration of silica from the catalyst particles to the alumina-containing particles is lessened by using alumina-containing particles which contain sodium, manganese or phosphorus.

Hydrogenation catalyst with improved metallic distribution, its preparation and use for the reduction of aromatic nitro compounds

Abstract: An iron-modified, platinum hydrogenation catalyst useful for the reduction of aromatic nitro compounds is provided. The catalyst, having improved distribution of the metallic components on an oleophilic carbon support as shown by ESCA analysis, is prepared by depositing a platinum compound (oxide, hydroxide or carbonate) on the carbon support at a temperature in the range of 55°-95° C., preferably 90°-95° C., and then reducing the compound to platinum metal, preferably with formaldehyde, at a temperature less than about 35° C. The iron in the catalyst is present and deposited as its oxide or hydroxide either at the same temperature as the platinum compound or at a temperature less than about 35° C. Using such a catalyst to reduce halogen-substituted nitro aromatic compounds to the corresponding amines results in low dehalogenation, low tar formation and hydroxylamine accumulation. For nonhalogenated nitro aromatic reductions, the catalyst minimizes ring reduction.

Method for preparing aluminosilicates, their use as catalyst supports and catalysts, and method for producing catalysts therefrom

Abstract: Aluminosilicates containing an organic nitrogen cation are prepared by mixing sources of silica, alumina and an alkali metal, water and either mono-ethanolamine or mono-propanolamine, or a derivative, or the precursors or a combination thereof and maintaining the mixture at a temperature in the range from 80° to 210° C. and a pressure in the range from 70 to 400 psig for over 4 hours. In a preferred embodiment the alkanolamines are prepared in situ` by reaction of the corresponding alkylene oxide with ammonia. Aluminosilicates so-prepared can be used without modification as catalysts and catalyst supports. Catalytic activity can be enhanced by, for example, reducing the sodium content or impregnating with a compound of one or more metals belonging to Groups 1B, 11B, 111A, 1VA, VA and V111 or reaction with a compound of one or more non-metals of Group 111A and VA of the Periodic Table.

Method for preparing a modified alumina catalyst support and a composition comprising said support and a catalyst

Abstract: A modified alumina catalyst support is prepared by mixing a Solution A containing alkali, a Solution B containing a salt of a modifying metal of Group 111A, other than aluminium, or V111 other than a platinum group metal, of the Periodic Table, and a Solution C containing a aluminium salt, to form a precipitate, ageing the precipitate, separating the precipitate from the supernatant liquor and calcining the precipitate. A platinum group metal may be added to the support and the resulting catalyst is suitable for catalyzing hydrocarbon conversation processes, particularly catalytic reforming.