Abstract: Medical use of natural and synthetic zeolites for treatment, prevention, and palliation in humans or animals of deleterious concentrations of ammonia, mercaptans, heavy metals and other toxins by oral administration.

Abstract: A method for synthesizing high purity montmorillonite is disclosed. According to this synthesis method, bentonite is dissolved in aqua regia to produce a solution and then sodium hydroxide (NaOH) is added to the solution to produce a mixed solution. Then, the mixed solution is kept in a sealed state at a temperature of 90° C. inclusive to 100° C. exclusive to synthesize montmorillonite crystals.

Abstract: This invention is directed to a new process for making an alkylaromatic compound. In an embodiment of this invention, the process is directed to selective synthesizing an alkylaromatic compound comprising a high amount of dialkylate product. In general, this process involves contacting at least one alkylatable aromatic compound with an alkylating agent and a catalyst under suitable reaction conditions such that the resulting reactor effluent prior to any stripping step may be characterized by a dialkylate product content of at least 44 wt % and a trialkylate and higher polyalkylate product content of no more than 20 wt %. The alkylaromatic compounds produced have excellent thermal and oxidative stabilities, good additive solvency, and improved seal compatibility while maintaining good VI and low temperature properties. They are useful as lubricant basestocks and lubricant additives.

Abstract: Aluminum silicate having a large cesium ion adsorption capacity and a production process therefor. (1) The aluminum silicate is represented by the following formula (I): xNa2O·Al2O3·mSiO2·nH2O??(I) (wherein 0.12?x?1.3, 5.0?m?15.0, and 5?n?15), (2) the Na2O content of the aluminum silicate is 1.5 to 11.0 wt %, and (3) at least 50% of aluminum atoms are tetra-coordination aluminum atoms.

Abstract: A catalytic composition is particularly well suited for hydrocarbon conversion to synthesis gas at a temperature of between 800 and 1000° Celsius. The catalytic composition includes a noble metal cluster having an X-Y-Z axial mean linear dimension of between 2 and 15 Angstroms and a super cage structure surrounding the noble metal cluster. The super cage structure stabilizes the noble metal cluster against aggregation at temperatures of 1000° Celsius. A process for reforming hydrocarbon feedstock to hydrogen and carbon monoxide is also provided that conversion to greater than 80% of theoretical yield.

Abstract: Modified molecular sieve characterized by improved sodium-resisting contamination activity and preparation method thereof are provided. The method comprises: adding molecular sieve in phosphorus-containing organic solution, and reacting for 10-200 minutes at temperature of 70-200° C. and pressure of 0.2-1.2 MPa, and then filtering, drying and calcining. The said modified molecular sieve contains 90-99 wt. % molecular sieve as dry basis and 1-10 wt. % phosphorus as oxide. The said method can improve the capability of sodium-resisting contamination effectively, and its technology is simple and fits the existing catalyst production apparatus and process. The said modified molecular sieve has high sodium-resisting contamination activity, and the model catalyst by sodium contamination has high activity retention.

Abstract: A titanium silicate variant named UPRM-5 was prepared using tetraethylammonium hydroxide as a structure-directing agent (SDA). Successful detemplation was achieved via ion exchange with NH4Cl. Effective functionalization was obtained after ion exchanging the detemplated material using SrCl2 and BaCl2. Adsorption of CO2 at 25° C. in Sr- and Ba-UPRM-5 materials activated at different temperatures. For low partial pressures, the observed CO2 adsorption capacities increased as follows: NH4-UPRM-5<Sr-UPRM-5<Ba-UPRM-5. Both the Sr- and Ba-UPRM-5 materials exhibited outstanding selectivity for CO2 over CH4, N2 and O2.

Abstract: A zeolite membrane production apparatus is provided having a reaction container having a support insertion opening for insertion of tubular supports and which houses a reaction solution for formation of zeolite membranes on the surfaces of the supports, a heating means for heating the reaction solution through the reaction container, and a supporting apparatus provided on the reaction container in a freely detachable manner and which supports a plurality of the supports. The inner wall surface of the reaction container has two mutually parallel flat surfaces, the supporting apparatus has a plurality of supporting sections that anchor one end of each of the plurality of supports, and the plurality of supporting sections are provided in the supporting apparatus such that when the supporting apparatus is set in the reaction container, each of the plurality of supports is disposed between the two flat surfaces and parallel to the two flat surfaces.

Abstract: An on-wafer crystallization method of spin-coating a silicon wafer with a low-k dielectric zeolite material which includes the steps of forming a synthesis solution; generating a nucleated precursor solution; spin-coating the nucleated precursor onto a substrate as a precursor film; and annealing the precursor film into a zeolite film.

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 first catalyst for reducing nitrogen oxides comprising a crystalline silicate containing an iron in ?-framework structure wherein a SiO2/Fe2O3 mol ratio is 20-300 and at least 80% of the contained iron is an isolated iron ion Fe3+. A second catalyst for reducing nitrogen oxides comprising a crystalline silicate containing an iron in ?-framework structure wherein a SiO2/Fe2O3 mol ratio is 20-300 and log(SiO2/Al2O3) by mol is at least 2. A predominant part of the contained iron is isolated iron ion Fe3+ and at least a part thereof preferably has a tetrahedral coordination. These catalysts have high hydrothermal stability and exhibit enhanced activity for reducing nitrogen oxides by a reaction with a reducing agent such as ammonia, urea or an organic amine in a broad temperature range between lower temperature and higher temperature.

Abstract: The present invention relates to an active and selective zeolite catalyst having MTT structure that is useful in skeletal isomerisation of light olefins. The method for the manufacture of the zeolite catalyst having MTT structure comprises the steps of a) preparing of a gel mixture capable of forming crystalline material, and the mixture comprising sources of alkali or alkaline earth metal (M), of an oxide of a trivalent element (X), of an oxide of a tetravalent element (Y), water and a directing agent (R), and the mixture having a composition, in terms of molar ratios, within the given ranges; b) maintaining the mixture under sufficient conditions, including a temperature of from about 100° C. to about 250° C., under dynamic mode of stirring until crystals of the material are formed, recovering the material; and c) removing the directing agent (R) partly or totally with a calcination procedure.

Abstract: The present invention relates to a method for preparing an aluminosilicate polymer and the polymer resulting from this method. Said method consists in treating an aluminum halide with an alkyl orthosilicate only having hydrolyzable functions with an aqueous alkali, in the presence of silanol groups, aluminum concentration being maintained at less than 0.3 mol/l, the Al/Si molar ratio being maintained between 1 and 3.6 and the alkali/Al molar ratio being maintained between 2.3 and 3; and then in stirring the resulting mixture at ambient temperature in the presence of silanol groups for long enough to form the aluminosilicate polymer.

Abstract: A quantity of solution sufficient to dissolve a pH controlling substance and/or substantially dissolve a surfactant without substantial excess solution is controlled under a set of time and temperature conditions to transform an inorganic material having long-range crystallinity to a mesostructure having long-range crystallinity. The method employs concentrated conditions that have a consistency similar to a thick slurry. The economic viability of scaling up such thick slurry methods is improved relative to prior more dilute methods of transforming an inorganic material to a mesostructure.

Abstract: Disclosed is a method of preparing ZSM-5 having substantially 100% crystallinity by using variable temperatures in the absence of an organic template, characterized in that a reaction mixture having a molar composition of M2O/SiO2 (M: alkali metal ion) of 0.07-0.14, H2O/SiO2 of 15-42 and SiO2/Al2O3 of 20-100 is nucleated at relatively high temperatures (180-210° C.) and then crystallized at relatively low temperatures (130-170° C.), thus easily controlling a crystal size and a particle size distribution of the ZSM-5.

Abstract: A process for the preparation of crystalline microporous titanium silicates using ethylsilicate-40 and titanium peroxide as silicon and titanium sources respectively is described. The process permits a significant decrease in the production cost of titanium silicate containing higher amount of titanium (Si/Ti=20) because of cheaper raw materials as well as reduction in the quantity of tetarpropylammonium hydroxide (TPAOH) template (SiO2:TPAOH=1:0.06–0.1) required for preparation. The material obtained by the present invention is useful as an active catalyst in the reactions such as oxidation of hydrocarbons, alcohols, sulphides, and thioethers.

Abstract: A process for the preparation of a metal-doped pentasil-type zeolite comprising the steps of: a) preparing an aqueous precursor mixture comprising a silicon source and an aluminum source, at least one of these sources being doped with a rare earth metal or a transition metal of Groups Vb–VIIIb, Ib, or IIb of the Periodic System, and b) thermally treating the precursor mixture to form a metal-doped pentasil-type zeolite. With this process, metal-doped pentasil-type zeolites can be prepared while the risk of precipitation of the dopant as a separate phase is minimized.

Abstract: The present invention relates to a process for the preparation of doped pentasil-type zeolite, which process comprises the steps of: a) preparing an aqueous precursor mixture from a silicon source, an aluminium source, and doped non-zeolitic seeds; and b) thermally treating the precursor mixture to form a doped pentasil-type zeolite. The term “non-zeolitic seeds” includes seeds made from materials selected from the group consisting of (i) X-ray amorphous materials, (ii) milled crystalline materials, such as milled zeolites, that have a relative crystallinity of not more than 75%, and (iii) crystalline materials other than zeolites, such as clays (e,g, bentonite and kaolin) and (low) crystalline aluminas.

Abstract: The present invention relates to the preparation of nanocrystalline zeolite beta by a modified aerogel protocol comprising four steps, namely, hydrolysis, nucleation, crystallization and supercritcal drying.

Abstract: The present invention relates to the preparation of nanocrystalline zeolite beta by a modified aerogel protocol comprising four steps, namely, hydrolysis, nucleation, crystallization and supercritcal drying.

Abstract: A fine low silica faujasite type zeolite of high purity, having a faujasite single phase as measured by X-ray diffractometry, wherein the SiO2/Al2O3 molar ratio is from 1.9 to 2.1, the water adsorption in the form of Na-type is at least 35.0%, and the primary particle size is at least 0.05 &mgr;m and less than 1.0 &mgr;m. A process for producing the low silica faujasite type zeolite by mixing and gelling a solution containing an aluminate and a solution containing a silicate, followed by aging and crystallization, wherein after the gelling and/or at the initial stage of the aging, a solution having a set composition and preliminary aged at recited conditions is added in an amount of from 0.03 to 10% as Al2O3.

Abstract: A process for converting hydrocarbons by contacting a hydrocarbon feedstream under hydrocarbon conversion conditions with a large crystal zeolite catalyst. The large crystal zeolite of the catalyst used in the hydrocarbon conversion process is made by heating an aqueous zeolite synthesis mixture under agitation to a temperature equal to or less than the effective nucleation temperature of the synthesis mixture. After this step, the aqueous synthesis mixture is heated in the absence of agitation to a temperature equal to or greater than the effective nucleation temperature of the aqueous zeolite synthesis mixture. The process finds particular application in hydrocarbon conversion processes where reduced non-selective acidity is important for reaction selectivity and/or the maintenance of catalyst activity, e.g., toluene disproportionation, dealkylation, alkylation, and transalkylation.

Abstract: A method is provided for zeolite synthesis from a synthesis medium containing in particular a trivalent aluminum source, a tetravalent silicon source, at least an alkaline or alkaline-earth cation in hydroxide form and water in a reactor containing a solid helical moving body in a guiding tube defining an internal space and a space external to the tube. The invention is characterized in that the synthesis medium is circulated in the reactor in a continuous flow passing through the internal space then the space external to the tube and returning to the internal space, only driven by the roation of the solid helical moving body, at a speed of less than 500 rpm, in the tube which is kept fixed, the synthesis medium being kept at a temperature suitable for at least one of the ripening operations or the crystal growth of the synthesized zeolite. The invention also is directed to a device for implementing the method.

Abstract: A process of preparing a ferrierite-type zeolite, with high crystallinity rate and having a anhydrous stage composition expressed by the formula M.sub.x (AlO.sub.2).sub.x (SiO.sub.2).sub.y, M being a cation of an alkaline metal such as Na or K, or a mix of both. The process contains a gel-producing step, by addition of boric acid to an aqueous aluminum-sulfate solution mixed with a aqueous solution containing oxides of Na and/or K and of Si, without the use of a structural agent. The invention also pertains to any zeolite obtained by this process, and its uses.

Abstract: A novel heat-resistant low-silica zeolite, an industrial production process, and uses of the low-silica zeolite are provided. The heat-resistant low-silica zeolite contains Si and Al in a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 ranging from 1.9 to 2.1, and has sodium and/or potassium as metal cation, wherein the low-silica zeolite contains low-silica faujasite type zeolite at a content of not lower than 88%, and has a thermal decomposition temperature ranging from 870.degree. C. to 900.degree. C. in the air. The process for producing the heat-resistant low-silica zeolite comprises mixing a solution containing an aluminate with another solution containing a silicate, allowing the resulting mixture to gel, and aging the resulting gel, at the temperature of from 0.degree. C. to 60.degree. C., to prepare a slurry having a viscosity ranging from 10 to 10000 cp and containing amorphous aluminosilicate having a specific surface area of not less than 10 m.sup.2 /g with an SiO.sub.2 /Al.sub.2 O.sub.

Abstract: Disclosed are high purity low-silica faujasite type zeolite showing a faujasite single phase on X-ray diffraction, having a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of 1.9 to 2.1 and a water adsorption of 35.0% by weight or more when converted to the Na type, and comprising particles having smaller primary particle size and particles having larger primary particle size, wherein the primary particle size of the smaller particles is from 1 .mu.m to 8 .mu.m, the primary particle size of the larger particles is from 5 .mu.m to 15 .mu.m, and the particles having smaller primary particle size accounts for 90% or more of the total particle number; and a method for producing low-silica faujasite type zeolite having a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of 1.9 to 2.

Abstract: Large crystal zeolites are prepared by heating a zeolite synthesis mixture under agitation to a temperature equal to or less than the effective nucleation temperature of the zeolite synthesis mixture and thereafter the zeolite synthesis mixture is heated without agitation to a temperature equal to or greater than the effective nucleation temperature of the zeolite synthesis mixture.

Abstract: The performances of the industrial manufacture of LSX faujasite are improved by proceeding to the aging and the crystallization of the gel by stirring with a Archimedean screw stirrer. In particular, the duration of the aging is shortened considerably without affecting the crystallinity of the final product.

Abstract: Process for manufacturing an alkali metal aluminosilicate of zeolite wherein zeolite P seeds are produced in situ in a first reacting gel with a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of above 2.2 and it is only after the formation of zeolite P seeds, but before said seeds have the time to fully grow, that sodium aluminate is added in order to get a gel which can have a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of about 2 which therefore enables producing a zeolite P having also a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of about 2.

Abstract: The invention relates to an improvement in the method for synthesis of crystalline aluminosilicate zeolites, such as ZSM-10, whose synthesis requires or is improved by one or more periods of gel aging. The gel aging step is replaced by a continuous increase in temperature to the final crystallization temperature.

Abstract: The present invention relates to a process for the preparation of a coagulant for water purification, in particular purification of sewage water, for pulp and paper manufacture, for dewatering organic matter, for concentrating minerals, and containing a metal salt and silicate, whereby a solid zeolite is dissolved in a solution of trivalent metal salt in a molar ratio Me.sup.3+ :Si of >2:1, preferably 2-500:1, as well as a coagulant.

Abstract: Finely ground zeolithic alkali metal aluminum silicates having the general formula: xMe.sub.2 O.Al.sub.2 O.sub.3.ySiO.sub.2.zH.sub.2 O, are prepared by mixing both reaction components, alkali metal silicate and alkali metal aluminate, in the presence of a stoichiometrically excessive amount of alkali metal hydroxide. The thus obtained gel is matured, the reaction mixture is heated up to crystallisation temperature, then crystallised. During crystallisation, at least one of both reaction components is added to the reaction mixture.

Abstract: Aluminosilicates in the form of P type zeolites are used as detergency builders and have a silicon to aluminium ratio not greater than 1.33, preferably above 0.9. These zeolites will usually have a calcium binding capacity of at least 150 mg CaO per gram of anhydrous aluminosilicate. A preferred form of the zeolite P has a silicon to aluminium ratio up to 1.15, and preferably above 0.9, with a tetragonally distorted cubic crystal structure. A process of the preparation of these zeolite P builders is described.

Abstract: A method of making a pillared hydrotalcite and an associated products. The pillared hydrotalcite is made by calcining a hydrotalcite having the formula A.sub.w B.sub.x (OH).sub.y [C].sub.z .multidot.nH.sub.2 O, wherein A represents a divalent metal cation, B represents a trivalent metal cation, C represents a mono- to tetravalent anion and w, x, y, z and n satisfy the following:0<z.ltoreq.x.ltoreq.4.ltoreq.w.ltoreq.1/2y and 12.gtoreq.n.gtoreq.1/2(w-x).The method further comprises combining the calcined compound with a salt solution of an anion to make the pillared derivative of the compound and then separating the pillared derivative from the salt solution. A method of intercalating inorganic anions and resulting product is also disclosed.

Abstract: In the hydrothermal synthesis of crystalline microporous molecular sieves from a reaction system containing an organic templating agent, it is found that removal of at least some of the organic reagent prior to the time the formation of crystalline product is complete results in an increased yield of the product. The removal of the organic reagent disrupts the equilibrium that is normally established in the reaction system at the selected crystallization temperature between product formation and product dissolution and shifts the reaction toward the formation of additional product before a new equilibrium can form.

Abstract: A method for synthesizing crystalline zeolites requiring a reaction mixture for crystallization thereof which contains Boron Beta Zeolite as an active source of silicon oxide and boron oxide.