摘要:
Improved processes for the preparation of olefins, unsaturated carboxylic acids and unsaturated nitrites involve the use of dehydrogenation catalysts suitable for the conversion of alkanes to alkenes and catalysts suitable for the conversion of alkanes and/or alkenes to unsaturated carboxylic acids or unsaturated nitrites.
摘要:
Improved processes for the preparation of olefins, unsaturated carboxylic acids and unsaturated nitrites involve the use of dehydrogenation catalysts suitable for the conversion of alkanes to alkenes and catalysts suitable for the conversion of alkanes and/or alkenes to unsaturated carboxylic acids or unsaturated nitrites.
摘要:
A catalyst comprising a promoted mixed metal oxide is useful for the vapor phase oxidation of an alkane or a mixture of an alkane and an alkene to an unsaturated carboxylic acid and for the vapor phase ammoxidation of an alkane or a mixture of an alkane and an alkene to an unsaturated nitrile.
摘要:
The present invention relates to a process for the oligomerization of ethene to a product rich in isobutylene comprising contacting a feedstock comprising ethene under oligomerization conditions with a catalyst composition comprising a porous crystalline silicate having the structure of ZSM-35 zeolite whose surface has been at least partially deactivated for acid catalyzed reactions by a) coking or b) chemisorption of a surface-deactivating agent, e.g., collidine, which possesses an average cross section diameter greater than that of the zeolite pores.
摘要:
There is provided an oligomerization process. The process involves the use of a catalyst comprising an acidic solid. The acidic solid may comprise a Group IVB metal oxide, such as zirconia, modified with an oxyanion of a Group VIB metal, such as tungsten. The oligomers produced by this process may be hydrogenated to produce thermally stable lubricants and lubricant additives.
摘要:
A surface-inactivated catalyst composition comprising acidic porous crystalline material, e.g., ZSM-23, having active internal Bronsted acid sites and containing coke-inactivated external acid sites is prepared by contacting the catalyst under high pressure coking conditions, e.g. 800 psig. The catalyst may be used for organic compound conversion, e.g., oligomerization of lower olefins to produce distillate boiling range materials having reduced methyl branching and increased cetane number.
摘要:
There is provided a process for the direct partial oxidation of methane with oxygen, whereby organic compounds comprising higher hydrocarbons are produced. The catalyst used in this reaction is a ZnZSM-5 catalyst. This catalyst may be prepared by ion exchanging or impregnating a ZSM-5 catalyst with a suitable zinc salt such as zinc nitrate.
摘要:
There is provided a process for the direct partial oxidation of methane with oxygen, whereby organic compounds comprising higher hydrocarbons are produced. The catalyst used in this reaction is a CuZSM-5 catalyst. This catalyst may be prepared by ion exchanging or impregnating a ZSM-5 catalyst with a suitable copper salt such as copper nitrate.
摘要:
A mixture of organic compounds comprising a major amount of liquid hydrocarbons, mostly aromatic, is formed by the direct partial oxidation of methane in the presence of a ZSM-5 catalyst. The reaction conditions are substantially the same as those required for the direct homogeneous partial oxidation to methanol. However, liquid hydrocarbon formation depends on the presence of a small amount of an impurity such as propane or propylene in the feed; in the absence of such, only methanol is formed. With such modifier present, controls of reaction parameters, e.g., temperature, permits synthesis of both methanol and liquid hydrocarbons in desired proportions. Properly processed natural gas can serve to provide methane and at least part of the reaction modifier.
摘要:
A reduction in the durene content of an effluent resulting from the zeolite-catalyzed conversion of a C.sub.1 -C.sub.4 oxygenate such as methanol to gasoline is disclosed wherein either the total effluent from said conversion or a bottoms fraction thereof containing durene is contacted with a particular zeolite catalyst to convert said durene to other products.