Abstract:
Hydrocarbons are converted by contacting them at hydrocarbon conversion conditions with an acidic multimetallic catalytic composite comprising a combination of catalytically effective amounts of a platinum group component, a nickel component, a cobalt component, and a halogen component with a porous carrier material. A preferred modifying component for the disclosed catalytic composite is a Group IVA metallic component. The platinum gold, nickel, cobalt and halogen components are present in the multimetallic catalyst in amounts, respectively, calculated on an elemental basis, corresponding to about 0.01 to about 2 wt. % platinum group metal, about 0.01 to about 2.5 wt. % nickel, about 0.05 to about 5 wt. % cobalt, and about 0.1 to about 3.5 wt. % halogen. Moreover, these metallic components are uniformly dispersed throughout the porous carrier material in carefully controlled oxidation states such that substantially all of the platinum group metal and nickel are present therein in the elemental metallic state, and substantially all of the catalytically available cobalt component is present in the elemental metallic state or in a state which is reducible to the elemental metallic state under hydrocarbon conversion conditions or in a mixture of these states. A specific example of the type of hydrocarbon conversion process disclosed is a process for the catalytic reforming of a low-octane gasoline fraction wherein the gasoline fraction and a hydrogen stream are contacted with the acidic multimetallic catalyst disclosed herein at reforming conditions.
Abstract:
Hydrocarbons are converted by contacting them at hydrocarbon conversion conditions with a sulfided acidic multimetallic catalytic composite comprising a combination of catalytically effective amounts of a platinum or palladium component, a rhodium component, a tin component, a halogen component, and a sulfur component with a porous carrier material. The platinum or palladium component, rhodium component, tin component, halogen component, and sulfur component are present in the multimetallic catalyst in amounts respectively, calculated on an elemental basis, corresponding to about 0.01 to about 2 wt. % platinum or palladium metal, about 0.01 to about 2 wt. % rhodium, about 0.01 to about 5 wt. % tin, about 0.1 to about 3.5 wt. % halogen, and about 0.01 to about 1 wt. % sulfur. Moreover, the metallic components are uniformly dispersed throughout the porous carrier material in carefully controlled oxidation states such that substantially all of the platinum or palladium component and the rhodium component are present therein in a sulfided state or in a mixture of the sulfided state and the elemental metallic state and such that substantially all of the tin component is present therein in an oxidation state above the elemental metal and in a particle size less than 100 Angstroms in maximum dimension. The sulfiding of the catalytic composite is performed prior to any contact of the composite with hydrocarbon and after substantially all of the platinum or palladium and rhodium components are reduced to the elemental metallic state by treatment with a sulfiding gas at conditions selected to incorporate about 0.01 to about 1 wt. % sulfur. The resulting sulfided catalyst has the capability of diminishing undesired demethylation and other hydrogenolysis reactions during initial operation of the process and markedly increasing the over-all stability of the process.
Abstract:
This invention relates to catalysts for use in the oxidation of organic compounds, for example methane, ethane, propylene and carbon monoxide, as well as for the production of methane by the steam reforming of naptha and naptha distillates. The catalyst includes an inert material on which there is applied an intermediate coating of at least one oxide selected from the group consisting of the oxides of titanium, zirconium, hafnium and thorium and a final or surface coating of a mixture or alloy of platinum, rhodium and optionally a base metal in which rhodium constitutes from 1-50 weight % and the base metal, if present, constitutes from 0.01 to 25 weight % of the total metal content.
Abstract:
An improved catalyst comprising a refractory support and platinum promoted with both gold and germanium exhibits increased activity and selectivity characteristics for the dehydrocyclization and reforming of hydrocarbons.
Abstract:
The invention concerns a catalyst in which a nickel component is deposited on an inert support, followed by an alumina coating and a rhodium component. The catalyst is particularly useful for removing nitrogen oxides from automotive exhaust.
Abstract:
An improved hydrodesulfurization catalyst characterized by the method of manufacture. The improvement is attributed to certain novel oxidizing procedures. Residual fuel oils are desulfurized in contact with the catalyst which comprises a Group VIB and Group VIII metal component preferably on an alumina support.
Abstract:
A monolithic carrier provided with longitudinal holes or passages is immersed in a mixed solution containing a salt of the platinum group metal and a sol of the alumina type as additional material. After immersion the coated carrier is dried in hot air and the salt is reduced in a stream of hydrogen at an elevated temperature to a metal to give a catalyst on the monolithic carrier. The sol may be converted into a gel before the reduction step.
Abstract:
Rhenium and platinum series metal-containing, calcined catalysts are prepared by I. DRYING AN AQUEOUS SLURRY OF HYDRATED ALUMINA TO OBTAIN A MIXTURE WHICH CAN BE FORMED INTO MACROSIZE PARTICLES; II. FORMING THE MIXTURE INTO MACROSIZE PARTICLES; III. CALCINING THE PARTICLES EITHER AT VERY HIGH TEMPERATURES OR IN THE PRESENCE OF WATER VAPOR, OR BOTH, SO AS TO REDUCE THE SURFACE AREA OF THE PARTICLES; IV. IMPREGNATING THE PARTICLES WITH AQUEOUS SOLUTION OF PLATINUM SERIES METAL COMPOUND AND AQUEOUS SOLUTION OF RHENIUM COMPOUND; AND V. RECALCINING THE IMPREGNATED PARTICLES UNDER GENERALLY LESS SEVERE CONDITIONS THAN IN (III) ABOVE.
Abstract:
This invention relates to a low cost spontaneous decomposition catalyst for hydrazine or mixtures containing hydrazine-hydrazine nitrate propellant fuels, which permits a low temperature ignition of the fuels and retains its activity after exposure to the propellant flame environment. The catalyst is produced by coating rhenium metal or a rhenium-molybdenum mixture on a support body such as alumina. Iron, nickel, copper, silver, gold, iridium, or ruthenium may be included as co-catalyst metals.