摘要:
An improved process for the preparation of aluminoxanes comprising contacting an aluminoxane precursor such as a hydrocarbyl substituted aluminum compound with a porous organic or inorganic aqueous imbiber material containing water sorbed or imbibed therein.
摘要:
The present invention is a continuous process for hydrogenating an unsaturated polymer comprising: contacting the unsaturated polymer with a hydrogenating agent in a fixed bed reactor, wherein the reactor is packed with a hydrogenation catalyst characterized in that the hydrogenation catalyst comprises a Group VIII metal component and at least one deactivation resistant component.
摘要:
A process for making 2,3-dihalopropanol including reacting 2,3-dihalopropanal with a hydrogenating agent in the presence of an iridium and a second transition metal mixed metal catalyst where the second transition metal is selected from the group comprising ruthenium, iron, molybdenum, tungsten, rhenium, osmium, manganese or vanadium, under conditions such that 2,3-dihalopropanol is formed. The 2,3-dihalopropanol is particularly useful in a process for making epihalohydrin.
摘要:
Aliphatic primary alcohols, including aliphatic primary alcohols possessing one or more oxygen, nitrogen and/or phosphorus heteroatoms that may be atoms substituting for carbon atoms in the alkyl group or component atoms of substituents on the alkyl group, were converted into salts of carboxylic acids by contacting an alkaline aqueous solution of the primary alcohol with a catalyst comprising cobalt, copper, and at least one of cerium, iron, zinc, and zirconium. Diethanolamine, for example, was converted to sodium iminodiacetate by treatment in an aqueous medium containing sodium hydroxide with a catalyst that was obtained by reducing a mixture of cobalt, copper, and zirconium oxides with hydrogen.
摘要:
A process of catalytically reacting a 3-18 carbon mono-olefin such as cyclohexene with an arylhydroxide such as phenol in the liquid phase forming an ortho-alkylated arylhydroxide which is subsequently catalytically dehydrogentated to form an ortho-alkenylarylhydroxide or ortho-arylarylhydroxide such as ortho-phenylphenol.
摘要:
Included is a process for redispersing catalysts wherein the catalyst metal is selected from the group consisting of ruthenium, osmium, rhodium and palladium comprising contacting the catalyst serially with (1) a reducing agent; (2) a halogen redispersing agent; and (3) a reducing agent, under conditions sufficient to redisperse the sintered catalyst. A preliminary oxygen treatment is optional. Also included are the novel catalysts such as redispersed by the foregoing process and processes in which sintered catalysts are redispersed and in which the redispersed catalysts are employed.The redispersed catalysts can have very high activity and can even have activity higher than originally found. A preferred metal is palladium and a preferred support is alumina.A preferred process for employing the redispersed catalyst is the production of .alpha.-substituted acrylate esters. For example, methylmethacrylate can be prepared from carbon monoxide, 2-chloropropene and methanol in the presence of the redispersed palladium on alumina catalyst.
摘要:
A modified carbon-supported metal catalyst is disclosed which has durability and activity wherein the surface of the carbon support has been modified by the addition of silicon carbides or boron carbides made by calcination. This catalyst is used as a catalyzed electrode in fuel cells.
摘要:
The present invention is a process of hydrogenating high molecular weight aromatic polymers comprising hydrogenating the high molecular weight aromatic polymer in the presence of a silica supported metal hydrogenation catalyst, characterized in that the silica has a pore size distribution such that at least 98 percent of the pore volume is defined by pores having diameter of greater than 600 angstroms.
摘要:
The hydrogenation of unsaturated polymers is effected employing a heterogeneous catalyst comprising a Group VIII metal and a porous support wherein the porous support is characterized by a pore size distribution such that at least 95% of the pore volume is defined by pores having diameters greater than 450 angstroms and the ratio of metal surface area to carrier surface area is in the range from about 0.07-0.75:1.
摘要:
A process for the conversion of a mixture of synthesis gas into preponderantly C.sub.1-10 oxygenated hydrocarbons and especially C.sub.1-5 mixed alcohols using a reduced catalyst of the necessary components of(1) niobium, tantalum, molybdenum, tungsten, technetium and/or rhenium; and(2) yttrium, a lanthanide and/or actinide series metal;and the optional components of(3) a promoter; and/or(4) a support.High synthesis gas conversions are possible in large part due to the high catalytic activity of the reduced catalyst. The reduced catalyst composition itself with yttrium as cocatalyst metal or promoted with special levels of a Fisher-Tropsch promoter.