Abstract:
A method for preparing an olefin oxidation catalyst, which comprises impregnating silver oxide or a water-insoluble silver salt, e.g. silver carbonate, silver carboxylates (having from 1 to 10 carbon atoms), silver chloride, etc., having a surface area of from 20 to 40 m2/g, preferably from 25 to 35 m2/g, with a solution containing a decomposable salt, selected from the group consisting of salts of Groups VII-B, I-B, or the iron group of Group VIII of the Periodic Table of the Elements, drying said impregnated salt, and activating by contacting with a reducing environment. Preferably the silver compound is silver oxide and said decomposable salt is selected from the group consisting of gold, copper, rhenium, manganese, and iron salts. The catalysts prepared by the instant method are especially effective in the oxidation of ethylene to ethylene oxide.
Abstract:
A catalyst for the production of ethylene oxide by oxidation of ethylene with oxygen, comprising a composition of silver and tin, having a tin content corresponding to an amount of between 5.10 5 (0.005 percent) and 5.10 2 (5 percent) by weight of the silver.
Abstract:
A process is taught for producing a ruthenium catalyst. A fixing compound, selected from alkaline earth materials or rare earth materials which decompose to an oxide of the material, is deposited on a catalytic support. A hydrated, halogenated ruthenium compound which reduces to ruthenium is also deposited on the catalytic support. The materials on the support are heated in a reducing atmosphere to form the ruthenium metal. After the reducing step the materials are fixed by heating them to a ruthenate forming temperature. The product produced in this manner is desirable for use in the catalytic conversion, in a reducing atmosphere, of oxides of nitrogen. The ruthenium catalyst of the product produced by this method is resistant to volatilization when exposed to an oxidizing ambient.
Abstract:
A DEACTIVATED HYDROCARBON CONVERSION CATALYST, WHICH IS A COMBINATION OF A PLATINUM GROUP COMPONENT, A RHENIUM COMPONENT AND A HALOGEN COMPONENT WITH A POROUS CARRIER MATERIAL AND WHICH HAS BENN DEACTIVATED BY DEPOSITION OF CARBONACEOUS MATERIAL THEREON DURING A PREVIOUS CONTACTING WITH A HYDROCARBON CHARGE STOCK AT AN ELEVATED TEMPERATURE, IS REGENERATED BY THE SEQUEENTIAL STEPS OF:(1E) BURNING CARBON THEREFRROM AT A RELATIVELY LOW TEMPERATURE WITH A GAS STREAM CONTAINING HALOGEN OR A HALOGEN-CONTAINING COMPOUND, H2O, AND A RELATIVELY SMALL AMOUNT OF 32, (2) TREATING THE RESULTING PARTIALLY REGENERATED CATLYST AT A RELATIVELY HIGHER TEMPERATURE WITH A GAS STREAM CONTAINING A HALOGEN OR A HALOGENCONTAINING COMPOUND, H2O, AND A RELATIVELY HIGHER AMOUNT OF O2, (3) PURGING O2 AND H2OO FROM CONTACT WITH THE RESULTING CATALYST, AND, (4) SUBJECTING THE RESULTING CATALYST TO CONTACT WITH A DRY HYDROGEN STREAM. KEY FEATURES OF THE DISCLOSED METHOD ARE: (1) PRESENCE OF WATER AND HALOGEN IN THE GAS STREAM USED IN THE CARBON-BURNING STEP AND IN THE OXYGEN-TREATING STEP, (2) CAREFUL CONTROL OF THE TEMPERATURE DURING EACH STEP, (3) MAINTENCE OF THE HALOGEN CONTENT OF THE CATALYST AT A RELATIVELY HIGH LEVEL DURING THE ENTIRE REGENERATION PROCEDURE, AND (4) CAREFUL CONTROL OVER THE COMPOSITION OF THE GAS STREAMS USED IN THE VARIOUS STEPS THEREOF.
Abstract:
A CATALYST FOR OXIDATION AND A METHOD FOR PRODUCING THE SAME, IN WHICH SAID CATALYST CONSISTS ANY ONE OF: (A) ALKALI POLYALUMINATE, (B) A MIXTURE OF SAID ALKALI POLYALUMINATE AND ANOTHER REFRACTORY MATERIAL, (C) A MIXTURE OF SAID (A) AS CATALYST CARRIER OR PROMOTER AND OTHER CATALYTIC MATERIAL, OR (D) A MIXTURE OF SAID (B) AS CATALYST CARRIER OR PROMOTER AND OTHER CATALYTIC MATERIAL.
Abstract:
A CATALYTIC COMPOSITE COMPRISING A COMBINATION OF A PLATINUM GROUP COMPONENT AND A TIN COMPONENT WITH A POROUS CARRIER MATERIAL IS DISCOSED. THE PRINCIPAL UTILITY OF THE SUBJECT COMPOSITE IS IN THE CONVERSION OF HYDROCARBONS, PARTICULARLY IN THE REFORMING OF A GASOLINE FRACTION. A SPECIFIC EXAMPLE OF THE CATALYST DISCLOSED IS A COMBINATION OF A PLATINUM COMPONENT, A TIN COMPONENT, AND A HALOGEN COMPONENT WITH AN ALUMINA CARRIER MATERIAL.
Abstract:
A catalytic reforming process wherein naphtha feed streams, boiling from about 80* to 450* F, and comprising naphthenes, paraffins and aromatics, are contacted, in an initial reaction zone, with a hydrogen containing gas, in the presence of a catalyst comprising Pt and a group IB metal supported on a refractory oxide; passed into a tail zone wherein the feed stream is again contacted with a catalyst and thereby further reacted; and a high octane product is recovered. In a preferred embodiment the Group IB metal is Cu.
Abstract:
An electrochemical electrode adapted for use in fuel cell batteries, metal-air batteries and electrochemical oxygen evolution instruments, and comprising an active catalyst which contains uranium and which in a small amount exhibits a catalytic activity equal to that obtainable from a larger amount of the conventional catalyst.
Abstract:
A propensity to form gummy mixtures with water is a troublesome characteristic of a technical grade of boehmite, said power comprising a total ignition loss of about 25 percent, a volatile alcohol content corresponding to less than 1 percent carbon, minor amounts of amorphous alumina and a major amount of alpha mono hydrate. A portion of the technical boehmite is mildly calcined at 400*-500* C. for at least 15 minutes to provide a dehydrated alumina powder, which then mixed with a significantly larger amount of the uncalcined technical grade of boehmite, can be mixed with water for providing a plastic mixture suitable for shaping into catalyst particles. The catalyst particles are calcined above about 600* C. for more than 1 hour in the presence of steam to form attrition resistant particles of gamma alumina having the pore size distribution desirable in certain types of catalysts.
Abstract:
DEHYDROGENATABLE HYDROCARBONS ARE DEHYDROGENATED BY CONTACTING THEM AT DEHYDROGENATION CONDITIONS WITH A CATALYTIC COMPOSITE COMPRISING A COMBINATION OF CATALYTICALLY EFFECTIVE AMOUNTS OF PLATINUM GROUP COMPONENT, A RHENIUM COMPONENT, A GERMANIUM COMPONENT AND AN ALKALI OR ALKALINE EARTH METAL WITH A POROUS CARRIER MATERIAL. A SPECIFIC EXAMPLE OF THE CATALYTIC COMPOSITE DISCLOSED HEREIN IS A COMBINATION OF A PLATINUM COMPONENT, A RHENIUM COMPONENT, A GERMANIUM COMPONENT AND AN ALKALI OR ALKALINE EARTH COMPONENT WITH AN ALUMINA CARRIER MATERIAL, WHEREIN THE COMPONENTS ARE PRESENT IN AMOUNTS SUFFICIENT TO RESULT IN THE COMPOSITE CONTAINING, ON AN ELEMENTAL BASIS, 0.01 TO 2 WT. PERCENT PLATINUM, 0.01 TO 2 WT. PERCENT RHENIUM, 0.01 TO 5 WT. PERCENT GERMANIUM AND 0.1 TO 5 WT. PERCENT OF ALKALI OR ALKALINE EARTH METAL.