摘要:
Process for the preparation of alkyl tert-alkyl ethers which comprises reacting a primary alcohol with an olefin having a double bond on a tertiary carbon atom in the presence of an acidic zeolite catalyst. Removal of any excess alcohol from the reaction product is accomplished by passing the reaction product through a bed of small pore zeolite.
摘要:
A method is disclosed for modifying an aluminosilicate-containing inorganic solid having a predetermined ion exchange capacity and containing an extractable silica by contacting, in the absence of added organic nitrogen or organic phosphorous compound and added activating metal oxide, the porous solid with liquid water at a pH of at least 6, at a temperature of up to 370.degree. C. for about 1 to 100 hours, and recovering a crystalline solid having an ion exchange capacity greater than the starting inorganic solid.
摘要:
A method of preparing a zeolite ZSM-12 type crystal which comprises crystallizing substantially pure ZSM-12 from a silica and optimally alumina gel mixture in the presence of a methyltriethylammonium cation, and the ZSM-12 product produced thereby.
摘要:
Layered silicate materials of high thermal stability and surface area which contain interspathic oxides such as silica as prepared by treating a layered silicate, with organic cation, to spread the layers apart. A compound such as tetraethylorthosilicate, capable of forming said oxide, is thereafter introduced between the layers. The resulting product is treated to form the oxide, e.g. by hydrolysis, to produce the layered silicate material. The resulting product may be employed as a catalyst material in the conversion of hydrocarbons.
摘要:
The acid activity of a high silica content crystalline zeolite that contains framework boron is increased by hydrolyzing a portion of the boron and compositing the crystals with a binder that contains alumina.
摘要:
A method of preparing a highly siliceous porous crystalline material related to the zeolite ZSM-12 having a composition, in terms of mole ratios of oxides, after dehydration, as follows:(1.0.+-.0.4)M.sub.2 /.sub.n O.multidot.Al.sub.2 O.sub.3 .multidot.(20-.infin.)SiO.sub.2,wherein M is at least one cation having a valence n, and characterized by an x-ray diffraction pattern whose values are set forth in Table 1 of the specification.
摘要:
There is provided a catalyst comprising a heteropoly acid, such as phosphotungstic acid, supported on a mesoporous crystalline material, such as M41S. A particular form of this M41S support is designated as MCM-41. There is also provided a method for preparing this catalyst by impregnating the heteropoly acid on the support. There is also provided a process for using this catalyst to catalyze acid catalyzed reactions, such as the isomerization of paraffins and the alkylation of aromatics.
摘要:
The invention deals with the determination of water content in presence of oils, as, for example, oil- and water-containing emulsions, using zeolites and the temperature rise caused upon adsorption of water as the basis.
摘要:
Octane and total yield improvement in catalytic cracking of petroleum fractions under cracking conditions can be obtained by adding to conventional cracking catalysts small amounts of an additive catalyst comprising a class of zeolites characterized by a silica to alumina mole ratio greater than 12 and a constraint index of 1 to 12 wherein the zeolite additive catalyst has a crystal size of between 0.2 to 10 microns.
摘要:
There is provided a process for preparation of crystalline microporous silicoaluminophosphates. The process involves the incorporation of a silicate complexing agent, such as fluoride, into an aqueous reaction mixture.