42results about "Ferrosilicates" patented technology

The invention provides methods for rapidly synthesizing heteroatom containing zeolites including Sn-Beta, Si-Beta, Ti-Beta, Zr-Beta and Fe-Beta. The methods for synthesizing heteroatom zeolites include using well-crystalline zeolite crystals as seeds and using a fluoride-free, caustic medium in a seeded dry-gel conversion method. The Beta zeolite catalysts made by the methods of the invention catalyze both isomerization and dehydration reactions.

This disclosure relates to new crystalline microporous solids (including silicate- and aluminosilicate-based solids), the compositions comprising 8 and 10 membered inorganic rings, particularly those having HEU topologies having a range of Si:Al ratios, methods of preparing these and known crystalline microporous solids using certain quaternized imidazolium cation structuring agents.

The invention relates to a preparation method of a multilevel pore heteroatom MFI-type molecular sieve. The preparation method comprises the following steps: S1, preparing xerogel; S2, performing sulfuric acid pre-carbonization for the xerogel; S3, carbonizing the xerogel at a high temperature to obtain C-SiO2 complex; S4, uniformly mixing a compound containing heteroatom, a micropore template agent, an alkaline source and deionized water, adding the C-SiO2 complex, sufficiently mixing, crystallizing, washing, drying, roasting, and obtaining the multilevel pore heteroatom MFI-type molecular sieve. The multilevel pore heteroatom MFI-type molecular sieve has the advantages that (1) compounds such as tween, span or triton are used as a mesoporous carbon source, so that the synthetic cost is decreased; and (2) the xerogel is subjected to the sulfuric acid pre-carbonization and high-temperature carbonization to obtain the C-SiO2 complex sufficiently coated with a silicon source and carbon material, the heteroatom is easier to anticipate in the crystallization of the molecular sieve in the liquid-phase mechanical drive process in an ion form, the amount of the heteroatom entering a molecular sieve skeleton is increased, the catalytic activity is improved, the dispersion limitation of intrinsic micropores of zeolite on the catalytic reaction is effectively solved, and the application in the field of macromolecular catalysis is enlarged.

The invention relates to a non-aluminium zeolite molecular sieve containing a TON / MTT skeleton topology structure and a preparation method of the zeolite molecular sieve. The preparation method comprises the steps of dissolving an inorganic alkaline source by using deionized water, then adding a template agent A, a boron source, an iron source or a gallium source, dissolving completely, then adding a template agent B or a silicon source, and adding an-all silicon ZSM-22 molecular sieve as seed crystal into obtained initial gel and then performing ultrasound; utilizing microwave radiation to heat a mixture subjected to the ultrasound so as to obtain a non-aluminum zeolite molecular sieve with a TON / MTT composite topology structure after crystallization. According to the method, the non-aluminium zeolite molecular sieve replaced with a heteroatom is utilized, the acidity is moderate, and the multilevel acidity distribution is adjustable; by adopting the preparation method provided by the invention, the synthesis time is short, the miscellaneous crystal is less, the particle size is uniform, and the repeatability is good. The composite molecular sieve has a huge potential application value in the aspects such as hydrocracking and isomerization.

The invention provides a sound absorption material. The sound absorption material comprises a heteroatom zeolite molecular sieve; the heteroatom zeolite molecular sieve comprises a framework and extra-framework cations; the framework comprises SiO2 and a metal oxide MxOy containing metal M, wherein the molar ratio of Si / M in the framework is 250-500, and the M comprises Fe; and the extra-frameworkcations are at least one selected from a group comprising cuprous ions, monovalent silver ions, monovalent gold ions, alkali metal ions or alkaline earth metal ions. The invention further provides aloudspeaker box applying the sound absorption material. Compared with the related art, the loudspeaker box has good acoustic low-frequency performance.

The present invention provides a titanium-silicalite molecular sieve and a method for preparing the same. The method includes the steps of preparing a mixture of a titanium source, a silicon source, a transition metal source, a template agent and water,heating the mixture to form a gel mixture,heating the gel mixture in a water bath,and calcining the gel mixture after the gel mixture in the water bath to form the titanium-silicalite molecular sieve. The present invention further provides a method for preparing cyclohexanone oxime by using the titanium-silicalite molecular sieve as the catalyst which results in high conversion rate, high selectivity and high usage efficiency of hydrogen peroxide.

The invention discloses a method for preparing a Fe-MFI microporous molecular sieve. The method, with tetraethylorthosilicate (TEOS) as a silicon source, iron nitrate as a heteroatom metal source, triethanolamine (TEA) as a complexing agent and tetrapropylammonium hydroxide (TPAOH) as a structure-directing agent, successfully prepares the iron-containing MFI microporous molecular sieve by extrusion molding by a dry gel method. According to the method for synthesizing the molecular sieve by the dry gel method, a smaller amount of the structure-directing agent TPAOH and a small amount of water are used for molding and synthesis of the iron-containing molded heteroatom molecular sieve in one step. The method can effectively avoid the filtration and washing process in the traditional process,reduce the production cost of the catalyst, minimize the generation of waste water, and belongs to the green environmental protection process.

The invention provides a preparation method of a hierarchical porous molecular sieve membrane. According to the method, a micropore-mesopore / macropore hierarchical porous structure is acquired through alkali treatment on the molecular sieve membrane; the alkali treatment means that the molecular sieve membrane is subjected to dissolution for a certain period of time at a certain temperature with a mixed system containing a molecular sieve, inorganic base or organic ammonium base and water, namely, a molecular sieve-alkaline suspension; a crystal form of the molecular sieve in the molecular sieve-alkaline suspension is matched with that of the molecular sieve membrane. Compared with a traditional microporous molecular sieve membrane, the hierarchical porous molecular sieve membrane prepared with the method has higher gas permeation flux. Besides, elemental composition of the molecular sieve membrane can be regulated through the alkali treatment. The method has a simple and efficient process, good repeatability and high success rate, and the prepared hierarchical porous molecular sieve membrane is applicable to chemical processes such as catalysis, separation and the like.

The present disclosure provides a sound absorbing material. The sound absorbing material comprises MEL-structural-type molecular sieves, the MEL-structural-type molecular sieves comprising frameworks and extra-framework cations, the frameworks comprising silica and an oxide MxOy containing an element M which is a non-silicon element; wherein a mass ratio of Si to M in the framework is at least 80, the extra-framework cations comprise at least one of hydrogen ions, alkali metal ions, alkaline earth metal ions and transition metal ions, and a content of the extra-framework cations is between 0.05 wt % and 1.5 wt %.

The invention relates to: a β-type iron silicate which has a fluorine content not more than 400 ppm by weight on a dry basis and in which the crystal grains have a truncated square bipyramidal morphology in an examination with a scanning electron microscope and the whole or part of the iron is contained in the β-type framework structure, and a process for producing the iron silicate; anther β-type iron silicate, and a process for producing the iron silicate; and a nitrogen oxide removal catalyst containing the other β-type iron silicate, a process for producing the catalyst, and a method for nitrogen oxide removal with the catalyst.

The invention discloses a hydrothermal synthesis method of a Fe-MFI molecular sieve. The method comprises the steps of (1) fully mixing an iron source, a silicon source, a template agent and deionizedwater, performing hydrolyzing, and keeping the temperature at 60-90 DEG C to obtain molecular sieve precursor gel; (2) preparing a crystallizing auxiliary agent, wherein the crystallizing auxiliary agent is CeO2-RuO2 composite oxide powder; (3) mixing the molecular sieve precursor gel with the crystallizing auxiliary agent, placing the mixture in a sealed vessel for heating to 160-180 DEG C, preserving the heat for 3 days or above, and then performing filtering, washing, drying and roasting to obtain the Fe-MFI molecular sieve. The hydrothermal synthesis method of the iron-containing MFI molecular sieve is improved, the catalytic conversion rate of the prepared iron-containing MFI molecular sieve on alpha-phenylethanol is obviously increased, and the catalytic stability of the synthesizedFe-MFI molecular sieve is superior to that of a Fe-MFI molecular sieve synthesized by means of a common synthesis method.

The invention provides an efficient method for purifying epoxypropane, which has low product loss and does not generate nitrogenous wastewater. According to the method for purifying the epoxypropane,in an epoxypropane rectifying tower, a hydrogen peroxide solution oxidizes aldehyde impurities in crude products into high-boiling-point acids under the action of a modified molecular sieve filler, and methanol is separated in a stripping section.

The present disclosure provides a sound absorbing material. The sound absorbing material comprising a heteroatom zeolite molecular sieve comprising a framework and an extra-framework cation, the framework comprising SiO2 and a metal oxide MxOy comprising a metal element M, wherein the framework has a molar ratio of Si / M between 250 to 500, wherein the M includes Fe, and that the extra-framework cation is at least one of a monovalent copper ion, a monovalent silver ion, a monovalent gold ion, an alkali metal ion or an alkaline earth metal ion. The sound absorbing material provided by the present disclosure, sound absorbing material to have better oxygen adsorption capacity, good waster repellency and stability. When such a sound absorbing material is applied to a speaker box, the speaker box will have better low frequency acoustic performance and better reliability.

The present disclosure provides a sound absorbing material. The sound absorbing material comprising a heteroatom zeolite molecular sieve comprising a framework and an extra-framework cation, the framework comprising SiO2 and a metal oxide MxOy comprising a metal element M, wherein the framework has a molar ratio of Si / M between 250 to 500, wherein the M includes Fe, and that the extra-framework cation is at least one of a monovalent copper ion, a monovalent silver ion, a monovalent gold ion, an alkali metal ion or an alkaline earth metal ion. The sound absorbing material provided by the present disclosure, sound absorbing material to have better oxygen adsorption capacity, good waster repellency and stability. When such a sound absorbing material is applied to a speaker box, the speaker box will have better low frequency acoustic performance and better reliability.

The invention provides a sound absorbing material. The material comprises an MEL structure molecular sieve, the MEL structure molecular sieve comprises a skeleton and a skeleton outer cation, the skeleton comprises silicon oxide and an oxide MxOy of an element M containing a non-silicon element, the skeleton is characterized in that the mass ratio of Si / M in the skeleton is at least 80, the skeleton outer cation comprises at least one of a hydrogen ion, an alkali metal ion, an alkaline earth metal ion and a transition metal ion, and the content of the skeleton outer cation is between 0.05 wt.% and 1.5wt. %. The invention also provides a speaker using the sound absorbing material. Compared with the prior art, the sound absorbing material of the molecular sieve of the MEL structure is addedto the speaker, which can significantly improve the low frequency performance of the speaker, and the sound absorbing material has strong resistance to performance degradation in practical applications.

The invention relates to the field of catalysis and in particular provides a silicon-containing molecular sieve and a preparation method thereof. The preparation method comprises the following steps:(1) hydrolyzing a silicon source, a VIII family metal source and a structure directing agent to obtain a hydrolyzed material; and (2) crystallizing the hydrolyzed material, wherein the step (1) is carried out in presence of an organic phosphorus compound and / or before the step (2), the hydrolyzed material is mixed with the organic phosphorus compound, then the crystallization is carried out, and the VIII family metal source is an iron source or a mixture of an iron source and a cobalt source. The silicon-containing molecular sieve prepared by adopting the preparation method can be applied to various fields such as dehydration reaction, selective dehydrogenation reaction, alkylation reaction, denitration reaction (reduction) and isomerization reaction. When the silicon-containing molecularsieve is applied to cyclohexyl hydroperoxide catalytic decomposition, an extra alkaline reagent does not need to be added, and reaction effects such as high alcohol ketone ratio and high alcohol ketone selectivity can be obtained at relatively low temperature.

The invention relates to a DDR zeolite molecular sieve synthesis method. In the prior art, the organic template for DDR zeolite molecular sieve synthesis is expensive and the crystal size of the DDR molecular sieve is too large. A purpose f the present invention is mainly to solve the problems in the prior art. According to the technical scheme, commercially available dimethyldiisopropylamine DMDIPA<+> is used as a templating agent, and a mixture is subjected to hydrothermal crystallization for 8-350 h at a temperature of 90-220 DEG C according to a ratio of DMDIPA<+> to YO2 to M2O to X2O3 toH2O of 0.05-1.0:1:0-0.75:0-0.1:1-100 to obtain a porous crystallized DDR zeolite molecular sieve material, wherein Y is at least a skeleton tetravalent element, X is at least a skeleton trivalent element, and M is an alkali metal element. According to the present invention, the cost of the used templating agent is low, the synthesized DDR zeolite molecular sieve has a small crystal grain size, andthe method has characteristics of simple operation, wide synthesis range and convenient promotion.

The invention provides a preparation method of a stepped hole heteroatom M-Beta molecular sieve. Compared with an existing synthesis method, the method has the advantages that the M-Beta molecular sieve can be directly synthesized through a one-step steam-assisted method, and the inherent defects of traditional hydrothermal synthesis are overcome. Compared with the existing M-Beta synthesis method, the method has the advantages that the M-Beta molecular sieve with a regular morphology and a stepped pore structure can be synthesized without a nuclear promoter aluminum and a high-corrosivity crystallization aid hydrofluoric acid; the synthesis time is reduced to 48 hours, the steps are simple, and the energy consumption can be effectively reduced; little crystallization liquid is generated so that the pollution problem of a large amount of crystallization waste liquid can be effectively avoided; meanwhile, the problem that a large amount of waste acid is discharged due to the fact that strong acid must be used for pretreatment in a traditional secondary isomorphous substitution method and an aluminum-containing one-step synthesis method is solved.

The invention relates to a DDR zeolite molecular sieve synthesis method. In the prior art, the organic template for DDR zeolite molecular sieve synthesis is expensive and the crystal size of the DDR molecular sieve is too large. A purpose f the present invention is mainly to solve the problems in the prior art. According to the technical scheme, commercially available dimethyldiisopropylamine DMDIPA<+> is used as a templating agent, and a mixture is subjected to hydrothermal crystallization for 8-350 h at a temperature of 90-220 DEG C according to a ratio of DMDIPA<+> to YO2 to M2O to X2O3 toH2O of 0.05-1.0:1:0-0.75:0-0.1:1-100 to obtain a porous crystallized DDR zeolite molecular sieve material, wherein Y is at least a skeleton tetravalent element, X is at least a skeleton trivalent element, and M is an alkali metal element. According to the present invention, the cost of the used templating agent is low, the synthesized DDR zeolite molecular sieve has a small crystal grain size, andthe method has characteristics of simple operation, wide synthesis range and convenient promotion.

The invention discloses preparation and applications of a platinum-based framework iron molecular sieve alkane dehydrogenation catalyst. The method comprises the following steps: respectively preparing a tetraethyl orthosilicate solution and a template agent tetrapropylammonium hydroxide solution according to a certain ratio, mixing to obtain a mixed solution, putting an iron salt into the mixed solution, and violently stirring at room temperature until the iron salt and the mixed solution are completely mixed; putting the mixed solution into a hydrothermal reaction kettle, and crystallizing in a drying oven; centrifuging and washing the crystallized sample, drying the washed sample in a drying oven overnight, and roasting the dried sample in a muffle furnace at 400-500 DEG C; cooling to room temperature to obtain the framework iron molecular sieve carrier; adding a certain amount of a platinum solution into the carrier by adopting an ion exchange method, drying the mixed sample in a drying oven overnight, putting the sample into a tubular furnace, and heating at 400-500 DEG C in an air atmosphere; and carrying out hydrogen reduction on the obtained solid powder to obtain the platinum-based framework iron molecular sieve alkane dehydrogenation catalyst capable of being used for realizing high monoolefine selective dehydrogenation of alkane. The catalyst has the characteristicsof easily available raw materials, simple process, low cost and the like.

The invention relates to a preparation method of a molecular sieve, and aims to provide a method for synthesizing boron-silicon and iron-silicon MTT zeolite in the absence of an organic structure directing agent. The method comprises the following steps: putting a solid silicon iron or silicon boron precursor, an alkali source, a seed crystal and ethanol into a mortar, and grinding; transferring an obtained mixture into a reaction kettle, and reacting for 15-6d at the temperature of 120-180 DEG C; and carrying out suction filtration on an obtained product, and drying to obtain the iron-siliconzeolite molecular sieve or boron-silicon zeolite molecular sieve. The product prepared by the method provided by the invention maintains good crystallinity and purity, and has good reaction activity.According to the present invention, environment-friendly ethanol is adopted as a zeolite pore channel filler, and only a small amount of the seed crystal is added as the guiding agent of the target product, such that the solid phase state is always maintained during the whole synthesis process, and the unnecessary waste gas and waste liquid discharge and loss during the production process are reduced. The adopted inorganic raw materials are environment-friendly and relatively low in price, so that the method has important significance in the field of actual chemical production.

The invention discloses an SCM-33 molecular sieve as well as a preparation method and application thereof. The SCM-33 molecular sieve has a schematic chemical composition as shown in the formula 'SiO2.1 / xXO1.5.mMO0.5', wherein X is a framework trivalent element, the Si / X molar ratio x is greater than or equal to 5, M is a framework equilibrium cation, and the M / Si molar ratio m is greater than 0 and less than or equal to 1. The molecular sieve is a novel molecular sieve with an RTE topological structure, is short in required preparation time and low in synthesis cost, and can be used as an adsorbent or a catalyst.

The present disclosure relates to an iron silicon molecular sieve and its preparation method thereof, and a sulficide oxidation method comprising: iron element, silicon element and oxygen element, wherein the molecular sieve satisfies X 1‑1.8 / X 0.4‑0.9 = A, 0.3 <a <0.9, preferably 0.35 <a <0.75, x 1‑1.8 The microporous aperture of the molecular sieve in the range of 1-1.8 nm accounts for the proportion of the total microporous aperture distribution, X 0.4‑0.9 The microporous pore size of 0.4-0.9 nm in the range of 0.4-0.9 nm is proportion to the total microporous aperture.The iron silicon molecular sieve provided by the present disclosure has a particular physical chemical characteristic structure for sulfide oxidation reaction, which facilitates increasing the conversion of thioether and facilitates the selectivity of the target product.

Supported catalysts, methods of making and using are described herein. A supported catalyst can include a metal nanostructure, an oxide, or an alloy thereof, having a Lewis acid active site capable of catalyzing the formation of an alkyl aromatic compound from an aromatic hydrocarbon and an olefin, and an inert hollow zeolite support. The inert hollow zeolite support has a peripheral shell with an exterior surface and an interior surface that defines and encloses a hollow space within the interior of the shell, where the metal nanostructure, or an oxide or an alloy thereof is comprised in the hollow space.

The invention relates to a non-aluminium zeolite molecular sieve containing a TON / MTT skeleton topology structure and a preparation method of the zeolite molecular sieve. The preparation method comprises the steps of dissolving an inorganic alkaline source by using deionized water, then adding a template agent A, a boron source, an iron source or a gallium source, dissolving completely, then adding a template agent B or a silicon source, and adding an-all silicon ZSM-22 molecular sieve as seed crystal into obtained initial gel and then performing ultrasound; utilizing microwave radiation to heat a mixture subjected to the ultrasound so as to obtain a non-aluminum zeolite molecular sieve with a TON / MTT composite topology structure after crystallization. According to the method, the non-aluminium zeolite molecular sieve replaced with a heteroatom is utilized, the acidity is moderate, and the multilevel acidity distribution is adjustable; by adopting the preparation method provided by the invention, the synthesis time is short, the miscellaneous crystal is less, the particle size is uniform, and the repeatability is good. The composite molecular sieve has a huge potential application value in the aspects such as hydrocracking and isomerization.

The invention relates to the field of the fine chemical industry, in particular to a method for processing a cyclohexane oxidation solution. The method comprises the step that the cyclohexane oxidation solution makes contact with a catalyst, wherein the catalyst contains a silicon-containing molecular sieve, and the cyclohexane oxidation solution contains cyclohexyl hydroperoxide. A preparation method of the silicon-containing molecular sieve comprises the steps that 1, a silicon source, a group VIII metal source and a structure guide agent are hydrolyzed to obtain a hydrolyzed material; 2, the hydrolyzed material is crystallized, wherein the group VIII metal source is an iron source or a mixture of the iron source and a cobalt source, and step 1 is conducted in the presence of an organophosphorus compound and / or before step 2, crystallization is conducted after the hydrolyzed material and the organophosphorus compound are mixed. The silicon-containing molecular sieve is used for processing the cyclohexane oxidation solution, extra alkaline reagents do not need to be added, the effects of a high alcohol-ketone ratio and high alcohol-ketone selectivity can be obtained at low temperature, and the method is high in industrial application value.

A new aluminosilicate zeolite designated UZM-50, methods of making the zeolite, and its use as a catalyst in hydrocarbon conversion processes are described. This zeolite is represented by the empirical formula M+ mRrA1-xExSiyOz where M is selected from the group consisting of hydrogen, sodium, potassium, magnesium, calcium or combinations thereof, R is the organic structure directing agent or agents derived from reactants R1 and R2 where R1 is an amine essentially incapable of undergoing pyramidal inversion and having 7 or fewer carbon atoms, and R2 is a dihaloalkane, and E is an element selected from the group consisting of gallium, iron, boron and mixtures thereof. UZM-50 has utility in various hydrocarbon conversion reactions such as conversion of an aromatic molecule to another aromatic molecule.