摘要:
The acidity of a zeolite catalyst is reduced by calcination in an essentially water-free atmosphere at temperatures above 700.degree. C., preferably from 725.degree. to 800.degree. C., to reduce the alpha value to less than 10 percent of its original value. The low acidity catalysts produced in this way may be used for isomerizing alkyl di-substituted aromatic compounds, especially xylenes, to products containing higher proportions of the para-isomers.
摘要:
This invention relates to acid catalysis, e.g. cracking, of organic compound feedstock, e.g. hydrocarbons, over catalyst material treated in a special way for increasing the acid catalytic activity thereof. In particular, a novel catalyst activation process is followed to enhance the alpha value of high-silica zeolite catalyst by contact with an ammoniacal solution of ammonium hydroxide and an alkali metal aluminate under appropriate conditions of time, temperature of pH.
摘要:
A method for increasing the total amount of lattice metal in the framework of a particular porous inorganic crystalline composition, its conversion to hydrogen or hydronium form and use thereof as a catalyst component having enhanced catalytic activity for conversion of oxygenates to hydrocarbons is provided.
摘要:
This invention relates to a new and improved form of crystalline silicate having the structure of zeolite Beta, to a new and useful improvement in synthesizing said crystalline silicate and to use of said crystalline silicate prepared in accordance herewith as a catalyst for organic compound, e.g. hydrocarbon compound, conversion.
摘要:
A method for increasing the total amount of lattice metal in the framework of a particular porous inorganic crystalline composition, its conversion to hydrogen or hydronium form and use thereof as a catalyst component having enhanced catalyatic activity is provided.
摘要:
Hydrolysis of olefin oxides to their corresponding glycols was catalyzed by a steam stable zeolite, in its acid form, characterized by a constraint index within the range of about 1 to 12. Conversions of olefin oxide, in the presence of water, proceeded with minimal catalyst degradation. The acidity of the zeolite enabled the use of milder conditions than generally applied for this hydrolysis with no loss of desired selectivity. In addition, the described procedure offered the advantages typically associated with a heterogeneous catalyst (e.g., ease of separation, use of fixed bed reactor, etc.).
摘要:
A crystalline high silica-containing zeolite such as ZSM-5 is treated with an ammoniacal alkali metal aluminate so as to enhance the catalytic activity thereof.
摘要:
A process is provided for conducting organic compound conversion over a catalyst composition comprising a supported crystalline zeolite having a high initial silica-to-alumina mole ratio, said supported zeolite being prepared by compositing said crystalline zeolite with a support matrix material, calcining the resulting supported zeolite, contacting said calcined supported zeolite with volatile boron fluoride in a dry environment until said supported zeolite is saturated with said boron fluoride, purging unreacted boron fluoride from said boron fluoride contacted supported zeolite, hydrolyzing said boron fluoride contacted supported zeolite, and converting said hydrolyzed material to hydrogen form.