Abstract:
A method of preparing a crystalline molecular sieve is provided, which method comprises (a) providing a reaction mixture comprising at least one source of ions of tetravalent element Y, at least one source of alkali metal hydroxide, water, optionally at least one seed crystal, and optionally at least one source of ions of trivalent element X, said reaction mixture having the following mole composition: Y:X2 =10 to infinity OH−:Y =0.001 to 2 M+:Y =0.001 to 2 wherein M is an alkali metal and the amount of water is at least sufficient to permit extrusion of said reaction mixture; (b) extruding said reaction mixture to form a pre-formed extrudate; and (c) crystallizing said pre-formed extrudate under vapor phase conditions in a reactor to form said crystalline molecular sieve whereby excess alkali metal hydroxide is removed from the pre-formed extrudate during crystallization. The crystalline molecular sieve product is useful as catalyst in hydrocarbon conversion processes.
Abstract:
A process has been developed to synthesize various zeolites with nano size crystals. The process involves forming an aluminosilicate initiator which exhibits the Tyndall effect and contains no appreciable filterable solids. This initiator is then mixed with a clear solution comprising reactive sources of Al, Si, M and R plus water. M is an alkali or alkaline earth metal while R is an organoammonium compound. The resultant reaction mixture is reacted at a temperature and for a time sufficient to produce a zeolite such as zeolite Y with average crystallite size less than 500 nm or preferably less than 300 nm.
Abstract:
The invention provides a preparation process of a zeolite-containing film which can raise a zeolite component therein, control the physical properties of the surface, and provide a highly smooth film. The process for preparing a zeolite-containing film has a step of forming a precursor film containing an amorphous silicon oxide portion and a zeolite-like recurring portion by using a material having an amorphous silicon oxide portion and a material having a zeolite-like recurring portion; and a dry gel conversion step of heating the precursor film in the presence of water vapor in order to grow the zeolite-like recurring portion. In this process, the material having an amorphous silicon oxide portion and/or the material having a zeolite-like recurring portion contain(s) a silicon atom bonded to the carbon atom of an organic group containing at least one carbon group.
Abstract:
An inorganic material that consists of at least two elementary spherical particles, each of said spherical particles comprising metal nanoparticles that are between 1 and 300 nm in size and a mesostructured matrix with an oxide base of at least one element X that is selected from the group that consists of aluminum, titanium, tungsten, zirconium, gallium, germanium, tin, antimony, lead, vanadium, iron, manganese, hafnium, niobium, tantalum, yttrium, cerium, gadolinium, europium and neodymium is described, whereby said matrix has a pore size of between 1.5 and 30 nm and has amorphous walls with a thickness of between 1 and 30 nm, said elementary spherical particles having a maximum diameter of 10 μm. Said material can also contain zeolitic nanocrystals that are trapped within said mesostructured matrix.
Abstract:
One aspect of the present invention relates to mesostructured zeolites. The invention also relates to a method of preparing mesostructured zeolites, as well as using them as cracking catalysts for organic compounds and degradation catalysts for polymers.
Abstract:
The invention is directed to a method of making a small crystal SSZ-32 zeolite, known as SSZ-32X. The catalyst is suitable for use in a process whereby a feed including straight chain and slightly branched paraffins having 10 or more carbon atoms is dewaxed to produce an isomenized product, with increased yield of isomerized material and decreased production of light ends.
Abstract:
There are provided methods for producing a zeolite layered composite, methods for producing a zeolite shaped body and methods for producing a zeolite layered intermediate body. In one aspect, there is provided a method for producing a zeolite layered composite, comprising layering a template-containing zeolite membrane having a composition the same as or similar to that of a zeolite shaped body of a completely crystallized zeolite composed of tetrapropylammonium ion (TPA) and silica sol in a mixing ratio (TPA/SiO2) of 0.015 to 0.08 by mole and containing a template therein on the zeolite shaped body, and simultaneously removing the template from the zeolite membrane and the zeolite shaped body by calcining the resulting layered product to obtain a zeolite layered composite comprising the zeolite shaped body and the zeolite membrane layered thereon.
Abstract:
A process for preparing a zeolitic material, comprising (i) preparing a mixture comprising the at least one silicon containing precursor compound from which the zeolitic framework is formed, at least one pore forming agent, and at least one polymer which has an essentially spheroidal geometry in the mixture; (ii) crystallizing the zeolitic material from the mixture obtained in (i) to obtain the crystallized zeolitic material in its mother liquor.
Abstract:
An aromatic alkylation process includes contacting an aromatic compound with an alkylating agent in the presence of a zeolite beta in a reaction zone under alkylation reaction conditions, wherein said zeolite beta is a high performance zeolite beta possessing a ratio of strong acid sites/weak acid sites greater than 1. The high performance zeolite beta is superior to conventional zeolite beta in the aromatics alkylation reaction, such as benzene alkylation with ethylene for ethylbenzene production, and benzene alkylation with propylene for cumene production.
Abstract:
The present invention relates to a method of preventing the intergrowth of an undesired porous crystalline phase during the preparation of a desired porous crystalline material comprising (1) an oxide of a first tetravalent element to (2) an oxide of a trivalent element, pentavalent element, second tetravalent element different from said first tetravalent element or mixture thereof, the method comprising contacting under crystallization conditions sources of said oxides, a structure directing agent capable of forming the desired porous crystalline material, and an amine too large to fit in the pores of the undesired porous crystalline phase.