40results 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 discloses a nano-zeolite granule comprising nano-zeolite particles and auxiliary agent. The proportion of the nano-zeolite particles in the nano-zeolite granule is greater than 75wt%. The particle size of the nano-zeolite particles is 30-500nm. The invention further provides a making method of the nano-zeolite granule. Compared with the related technology, the nano-zeolite granule made by the making method of the invention has an obvious low frequency reduction effect and strong anti-aging ability. A speaker box using the nano-zeolite granule has better low-frequency performance and a longer service life.

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 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 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 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.

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.

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.