摘要:
The present invention provides a process for treating shaped catalyst bodies which has the following steps: a) providing finished shaped catalyst bodies, b) impregnating the finished shaped catalyst bodies with a peptizing auxiliary in an amount of liquid which does not exceed the theoretical water absorption of the shaped catalyst bodies, c) thermal treating the impregnated shaped catalyst bodies at from 50° C. to 250° C. and d) calcinating the thermally treated shaped catalyst bodies at from 250° C. to 600° C. A shaped catalyst body which has increased mechanical strength and can be produced by the process of the invention is also provided. The present invention relates to the use of the shaped catalyst bodies of the invention for preparing amines and also in fixed-bed reactors or fluidized-bed reactors and to a chemical synthesis process in the presence of shaped catalyst bodies according to the present invention.
摘要:
The present invention relates to a supported catalyst system. The supported catalyst of the present invention comprises an inorganic support having attached to at least one surface thereof non-acidic, hydrophillic, hydroxyl-containing organic R10 groups having no or substantially no surface charge in solution, and at least one linker capable of binding a catalytic species, e.g. an enzyme or an organometallic molecule, wherein the linker is attached to a catalytic species. The R10 groups preferably are selected from the group consisting of—CH2OH, —CH(OH)2, —CH(OH)CH3, —CH2CH2OH, —CH(OH)2CH3, —CH2CH(OH)2, —CH(OH)CH2(OH) and mixtures thereof. The presence of the R10 groups on the support surface prevents or reduces non-specific binding of the catalytic species with the support surface by minimizing hydrophobic interactions and providing no or substantially no surface charge in the region of the support having catalytic species attached thereto. Simultaneously, the linker binds the catalytic species to the surface of the support in a manner which permits the catalytic species to be freely available for catalytic activity. Methods of catalyzing a reaction using the supported catalyst system of the invention are also disclosed.
摘要:
A description follows of a bimetallic catalyst, obtained by dispersing in sequence and alternating the precursors of the single metal components of the catalyst on a carrier, and a process for the synthesis of hydrogen peroxide by the direct reaction of hydrogen with oxygen, in a solvent medium containing a halogenated promoter and an acid promoter, in the presence of said catalyst.
摘要:
Disclosed is a process for preparing a supported metallocene catalyst by introducing, in a first stage, a gas stream comprising an organoaluminum compound, an inert support material and water, into a first gas phase reactor; allowing the mixture to react under conditions effective to form an aluminoxane supported on said inert support material; metering a second gas stream comprising a metallocene into said gas phase reactor; allowing said mixture to react under conditions effective to form a supported metallocene catalyst; and drying, in a second stage, said supported metallocene catalyst, wherein said drying is carried out in a gas phase reactor. An alternative process comprises introducing, in a first stage, a gas stream comprising an organoaluminum compound, an inert support material, a metallocene and water, into a first gas phase reactor; allowing the mixture to react under conditions effective to form an aluminoxane supported with said metallocene on said inert support material; and drying, in a second stage, said supported metallocene catalyst, wherein said drying is carried out in a gas phase reactor.
摘要:
Improved methods and apparatus for manufacture of maleic anhydride by catalytic oxidation of n-butane or other hydrocarbon having four carbon atoms in a straight chain over a fixed catalyst bed comprising a phosphorus vanadium oxide catalyst. Movement of catalyst bodies with respect to each other and with respect to the walls of the reaction chamber is restrained so as to prevent the catalyst bodies from abrading against each other or the reactor chamber walls in a manner that would cause formation of catalyst fines. Methods and apparatus are also provided for removal of fines from a fixed catalyst bed. The methods of the invention are effective to prevent loss of catalyst from a tubular reactor, and to control degradation of solvent absorbent in a process in which maleic anhydride is separated from the reaction gas by absorption into such a solvent.
摘要:
Improved, heterogeneous, refractory catalysts are in the form of gas-impervious, hollow, thin-walled spheres (10) suitable formed of a shell (12) of refractory such as alumina having a cavity (14) containing a gas at a pressure greater than atmospheric pressure. The wall material may be itself catalytic or a catalytically active material coated onto the sphere as a layer (16), suitably platinum or iron, which may be further coated with a layer (18) of activator or promoter. The density of the spheres (30) can be uniformly controlled to a preselected value within .+-.10 percent of the density of the fluid reactant such that the spheres either remain suspended or slowly fall or rise through the liquid reactant.
摘要:
The present invention provides a process for treating shaped catalyst bodies which has the following steps: a) providing finished shaped catalyst bodies, b) impregnating the finished shaped catalyst bodies with a peptizing auxiliary in an amount of liquid which does not exceed the theoretical water absorption of the shaped catalyst bodies, c) thermal treating the impregnated shaped catalyst bodies at from 50° C. to 250° C. and d) calcinating the thermally treated shaped catalyst bodies at from 250° C. to 600° C. A shaped catalyst body which has increased mechanical strength and can be produced by the process of the invention is also provided. The present invention relates to the use of the shaped catalyst bodies of the invention for preparing amines and also in fixed-bed reactors or fluidized-bed reactors and to a chemical synthesis process in the presence of shaped catalyst bodies according to the present invention.
摘要:
A description follows of a bimetallic catalyst, obtained by dispersing in sequence and alternating the precursors of the single metal components of the catalyst on a carrier, and a process for the synthesis of hydrogen peroxide by the direct reaction of hydrogen with oxygen, in a solvent medium containing a halogenated promoter and an acid promoter, in the presence of said catalyst.