摘要:
A process for forming a dispersion of metal selected from the group consisting essentially of Ni, Co, Mo and mixtures thereof on graphite comprising heating a composite of said metal on graphite at a temperature between about 800.degree.-975.degree. C. in an inert, hydrogen-containing atmosphere to form metal-containing channels in the graphite, raising the temperature to at least about 975.degree. C. so that the metal in the channels spreads out and chemically wets the surface of the channels as a film of metal phase, followed by contacting the so-formed metal-wetted, channeled composite with an oxidizing atmosphere to break up the film of metal phase into discrete metal particles. The average diameter of the particles is generally below about 25 A and the preferred metal is nickel.
摘要:
Hydrogen contamination of chlorine-containing gas, such as the chlorine gas from the electrolytic chlorine/caustic process and especially the tail gas from the chlorine liquefaction operation, is eliminated by reaction of the hydrogen directly in the gas mixture at elevated temperature in the presence of a catalyst, to effect combination of the hydrogen with chlorine to form hydrogen chloride, followed by scrubbing of the hydrogen chloride from the gas.
摘要:
Catalyst and process for the production of chlorofluorinated hydrocarbons are disclosed by reacting a hydrocarbon with HCl, HF and an oxygen-containing gas under oxychlorofluorination conditions in the presence of a catalytic composition comprising magnesium and copper ions each in combination with fluoride ions and an alkali metal ion, or mixtures thereof, in combination with chloride ions.
摘要:
Catalyst of cuprous chloride, as a first layer, on a carrier of particles of pyrogenic anhydrous silica or titania, or alpha-alumina produced from pyrogenic gamma-alumina, having as a second layer an alkali metal chloride especially KCl, and preferably also a rare earth metal chloride; especially LaCl.sub.3 ; formed by impregnation using non-aqueous solvents, especially CuCl in acetonitrile followed by KCl/LaCl.sub.3 in formic acid. The catalyst is effective at desirable reaction rates at temperatures well below 400.degree. C., such as 200.degree.-300.degree. C. and even below 200.degree. C., under certain conditions, for oxyhydrochlorination of organic materials such as methane; and is also effective for production of chlorine by the Deacon process at relatively low temperatures. Problems due to catalyst volatility and melting are substantially mitigated.
摘要:
The catalyst consists essentially of a calcium fluoride matrix and a thermally stable copper-containing phase as produced by coprecipitation of calcium fluoride and copper fluoride and/or calcium hydroxide and copper oxide, in presence of alkali metal or ammonium ion. The coprecipitate is thoroughly dried and heated at elevated temperature; followed, if the coprecipitate is in the form of hydroxide and/or oxide, by conversion of such hydroxide and oxide to fluoride.The preferred alkali metal ion is potassium.The most active and stable catalysts show by X-ray diffraction a pattern including lines characteristic of calcium fluoride and additional lines indicative of a face-centered cubic unit cell having unit dimension of about 8.1-8.4 A.The catalyst operates at about 200.degree.-550.degree. C. depending to some extent on the substrate.
摘要:
A process for preparing a zeolite, e.g. ZSM-5, under controlled conditions of initial pH adjustment with an acid, SiO.sub.2 /Al.sub.2 O.sub.3 mole ratio, and in the presence of sodium cations, is disclosed, as well as a process for using the same to synthesize olefins from methanol and/or dimethyl ether.
摘要翻译:一种制备沸石的方法,例如 ZSM-5在使用酸,SiO 2 / Al 2 O 3摩尔比的初始pH调节和钠阳离子存在下的控制条件下进行了公开,以及使用该方法从甲醇和/或二甲基合成烯烃的方法 醚。
摘要:
A process for preparing a zeolite, e.g. ZSM-5, under controlled conditions of initial pH adjustment with an acid, SiO.sub.2 /Al.sub.2 O.sub.3 mole ratio, and in the presence of sodium cations, is disclosed, as well as a process for using the same to synthesize olefins from methanol and/or dimethyl ether.
摘要翻译:一种制备沸石的方法,例如 ZSM-5在使用酸,SiO 2 / Al 2 O 3摩尔比的初始pH调节和钠阳离子存在下的控制条件下进行了公开,以及使用该方法从甲醇和/或二甲基合成烯烃的方法 醚。
摘要:
A process for improving the catalyst life of zeolites employed in the conversion of alcohols (e.g. methanol) and/or their ether derivatives (e.g., dimethyl ether) wherein a suitable zeolite is modified in a 2-stage procedure by providing a controlled low amount of a coke precursor deposit on the external surface of the zeolite, and then heating this treated zeolite in an inert gas at specifically controlled temperatures for a minimum time is disclosed. A process of employing this modified zeolite to produce lower olefins is also disclosed.
摘要:
The catalyst consists essentially of a calcium fluoride matrix and a thermally stable copper-containing phase as produced by coprecipitation of calcium fluoride and copper fluoride and/or calcium hydroxide and copper oxide, in presence of alkali metal or ammonium ion. The coprecipitate is thoroughly dried and heated at elevated temperature; followed, if the coprecipitate is in the form of hydroxide and/or oxide, by conversion of such hydroxide and oxide to fluoride.The preferred alkali metal ion is potassium.The most active and stable catalysts show by X-ray diffraction a pattern including lines characteristic of calcium fluoride and additional lines indicative of a face-centered cubic unit cell having unit dimension of about 8.1-8.4 A.The catalyst operates at about 200.degree.-550.degree. C. depending to some extent on the substrate.
摘要:
Catalyst and process for the production of chlorofluorinated hydrocarbons are disclosed by reacting a hydrocarbon with HCl, HF and oxygen-containing gas under oxychlorofluorination conditions in the presence of a catalytic composition comprising magnesium and copper ions each in combination with fluoride ions and an alkali metal ion, or mixtures thereof, in combination with chloride ions.