77results about "Molecular-sieve silicates" patented technology

A composition of matter is provided comprising hierarchically ordered crystalline microporous material having well-defined long-range mesoporous ordering of lamellar symmetry. The composition possesses mesopores having walls of crystalline microporous material and a mass of mesostructure between mesopores of crystalline microporous material. Long-range ordering is defined by presence of secondary peaks in an X-ray diffraction (XRD) pattern and / or lamellar symmetry observable by microscopy.

The invention provides an oriented ultrathin FER zeolite molecular sieve membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, synthesizing a monodisperse FER zeolite nanosheet with a high length-depth ratio through a hydrothermal method; preparing a seed crystal liquid, and coating the surface of a porous carrier with the seed crystal liquid to form an oriented seed crystal layer; and carrying out hydrothermal epitaxial growth in a secondary growth solution. Through innovative design of seed crystal synthesis and epitaxial growth, the FER zeolite membrane prepared by the method has a structure with high alpha-axis preferred orientation, submicron controllable thickness, compactness and no defect. The membrane can be used for accurately screening gas molecules with small size difference by utilizing six-membered ring pore channels uniformly arranged along an a axis. When helium and methane or carbon dioxide are separated, the membrane shows permeation flux and separation selectivity far superior to those in the prior art, provides a brand new technical approach for efficient and low-energy-consumption recovery of helium and other high-value gases in the industry, and has great industrial application value.

A novel synthetic crystalline molecular sieve material called boron SSZ-121 is provided. Boron SSZ-121 can be synthesized using 1,3-bis(1-adamantyl)imidazolium cation as a structure directing agent. Boron SSZ-121 can be used in organic compound conversion reactions and / or sorption processes.

The invention discloses a hierarchical pore molecular sieve and a preparation method thereof. The hierarchical pore molecular sieve comprises micropores and mesopores, the mesoporous aperture of the hierarchical pore molecular sieve is 6-12 nm; the hierarchical pore molecular sieve is a silicon-aluminum molecular sieve. The method comprises the following steps: adding a molecular sieve matrix into an alkali solution containing a surfactant and inorganic salt, carrying out alkali treatment, and carrying out ammonium ion exchange to obtain the hierarchical pore molecular sieve. According to the method, the molecular sieve is treated by adding the surfactant and the inorganic salt into the aqueous alkali, so that the pore size distribution and the pore volume of mesopores in the molecular sieve are effectively regulated and controlled, and the hierarchical pore molecular sieve with the mesopore size distribution of 6-12nm can be obtained.

The invention discloses a preparation method and application of titanium silicalite porous water, and belongs to the field of materials. The preparation method comprises the following steps: S1, calcining titanium silicalite TS-1; s2, adding the calcined titanium silicalite TS-1 into water, sealing, and carrying out ultrasonic treatment to obtain a milk white concentrated solution; s3, centrifuging the milky white concentrated liquor to obtain supernate, repeating the operation, discarding the supernate after the last centrifugal cycle to obtain precipitated titanium silicalite TS-1, and dispersing the precipitated titanium silicalite TS-1 in water to obtain the titanium silicalite porous water. The preparation method is simple and easy to implement, and titanium silicalite porous water can be synthesized on a large scale. The titanium silicalite porous water is applied to photo-thermal tandem catalytic synthesis of ethylene glycol, can improve adsorption of oxygen and ethylene and promote mass transfer of the oxygen and the ethylene in water, and more importantly, the titanium silicalite porous water can enable a TS-1 catalyst to be uniformly dispersed, so that photo-physical and photo-chemical processes of the photocatalyst are regulated and controlled, and synthesis of ethylene glycol is promoted.

The invention discloses a preparation method and application of a titanium silicalite molecular sieve TS-2, and belongs to the technical field of molecular sieves. The preparation method specifically comprises the following steps: (1) adding quaternary ammonium base and quaternary ammonium salt into water, and mixing and stirring; (2) adding a silicon source, mixing and stirring; (3) adding an isopropanol solution of a titanium source, and stirring for hydrolysis; (4) heating and stirring, and heating and crystallizing; and (5) cooling, filtering, washing, drying and roasting. The preparation method comprises the following steps: regulating the pH value to be lower than 12 through a composite template agent (quaternary ammonium base and quaternary ammonium salt), enabling the concentration of tetrabutylammonium cations of a system to be in a relatively high state, and preparing a titanium silicalite molecular sieve TS-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3-dibromo-2, 3- The catalyst has high mass transfer efficiency and high catalytic performance.

The invention relates to a titanium silicalite molecular sieve and a preparation method thereof, and the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder, a first binder, water and an optional first surfactant, carrying out first molding, and carrying out first roasting treatment on a solid product obtained by the first molding to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second surfactant, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing alkaline steam aging treatment on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; and S4, carrying out secondary roasting treatment on the titanium silicalite molecular sieve pre-product. The method disclosed by the invention is simple and green in steps, and the prepared titanium silicalite molecular sieve has relatively high mechanical strength.

The present invention relates to the technical field of molecular sieves, and in particular to a method for synthesizing a silicon-aluminum EUO molecular sieve, comprising the following steps: step S1, mixing; step S2, flash evaporation; step S3, supplementing an aluminum source; step S4, crystallization; step S5, filtering, washing, drying, and calcining the crystallized product obtained in step S4; wherein in step S2, the precursor powder is amorphous as detected by XRD, and the precursor powder is amorphous as detected by XRD. 27 Al magic angle spinning solid nuclear magnetic resonance detection shows that tetracoordinated and hexacoordinated aluminum species exist at the same time. The present invention first mixes a silicon source, an alkali source and a part of an aluminum source, and then flash evaporation and drying is performed to form chemical bonds between silicon and aluminum species, especially aluminum species, which form tetracoordinated and hexacoordinated species, which are helpful for crystallization, and then introduces an aluminum source with high reactivity for quick de-powdering, and after mixing, crystallization is performed in an extremely concentrated system, and the alkaline auxiliary agent plays a role in maintaining the high alkalinity of the system, so that crystallization is completed in a relatively short time.

The present invention discloses a novel sound-absorbing material, ION molecular sieve, molecular sieve microspheres, and a preparation method and application thereof, and relates to the technical field of loudspeakers. The preparation method of the ION molecular sieve comprises the following steps: uniformly mixing a silicon-containing compound with ammonium fluoride or hydrofluoric acid, an organic template, and water to obtain a mixed gel; the organic template is a double-headed organic compound with a quaternary ammonium salt cation as an end group, having a structural formula shown in the following formula (I), wherein the number of carbon chains of the R1 end group in formula (1) is selected from 2 or 3, and the anion H ‑ OH ‑ The mixed gel was transferred to a stainless steel autoclave and heated. The solid phase crystals were filtered, washed, dried, and calcined to obtain the novel sound-absorbing material, ION molecular sieve. The preparation method is simple, the raw materials are widely available and highly utilized, the product structure is novel, and the crystallinity is excellent. The prepared molecular sieve microspheres are uniform in particle size and exhibit no noticeable powder shedding. Testing has shown that the speaker's resonant frequency significantly improves low-frequency acoustic performance.

The application discloses a synthesis method of nanoscale sheet TS-1 titanium silicate molecular sieve. Tetraethyl orthosilicate is used as a silicon source, tetrabutyl titanate is used as a titanium source, tetrapropyl ammonium hydroxide is used as a template agent, and an ammonium salt is added as an assistant for limiting particle growth along a b axis. After hydrothermal reaction, the obtained product is washed, baked and calcined, so that the nanoscale sheet TS-1 titanium silicate molecular sieve with a b axis size of 20-50 nm and a axis and c axis size of 80-150 nm is synthesized. The method has the advantages of simple operation, repeatability, small template agent consumption, low cost, easy industrial production and application, etc. The sheet nanoscale TS-1 titanium silicate molecular sieve synthesized by the method has small particle size, thin b axis thickness, large specific surface area, more exposed Ti active sites, shortened transmission path of reactants and products, reduced diffusion resistance, and higher catalytic activity for oxidation reactions of toluene and cyclohexene.

The present application relates to a kind of cross hollow MFI molecular sieve and its preparation method and application in catalyst.The crystal grain of the cross hollow MFI molecular sieve is cross hollow morphology, using seed and template combination under certain feeding step and proportion to prepare mother liquor, by dynamic crystallization synthesis matrix molecular sieve, then by alkali treatment to obtain hollow molecular sieve.The cross hollow MFI can replace existing MFI molecular sieve to prepare catalyst, with good anti-wear performance, can maintain catalytic activity in fluidization process.

The invention relates to a titanium silicalite molecular sieve and a preparation method and application thereof, the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder, a first binder, water and an optional first surfactant, carrying out first molding, and carrying out first roasting treatment on a solid product obtained by the first molding to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second surfactant, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; s4, carrying out secondary roasting treatment on the titanium silicalite molecular sieve pre-product; the mode of the first-time forming is extrusion forming. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has higher mechanical strength and larger specific surface area, and when the titanium silicalite molecular sieve is used for a reaction for preparing epoxypropane, higher epoxypropane selectivity and yield can be obtained.

The present invention relates to the field of molecular sieves, and discloses a ZSM-48 molecular sieve and a preparation method and application thereof, wherein the molar ratio of silicon oxide to aluminum oxide in the ZSM-48 molecular sieve is not less than 40, and the specific surface area of ​​the ZSM-48 molecular sieve is not less than 200m 2 / g, the crystal grains of the ZSM‑48 molecular sieve are ellipsoidal, the major diameter does not exceed 700nm and the ratio of the major diameter to the minor diameter is 1‑3:1. A synthesis system of clean water + molecular sieve mother liquor is adopted, seed crystals are introduced, and a ZSM‑48 molecular sieve with an ellipsoidal morphology is prepared through three stages of crystallization processes at different temperatures, thereby increasing the specific surface area of ​​the molecular sieve. When the molecular sieve is applied to the dewaxing of waxy oil, the product yield and viscosity index are higher.

The present invention relates to a zeolitic material of MFI framework type having a framework structure comprising Si, O, and Ti, obtained or obtainable from a Ti containing compound, wherein the Ti containing compound has an APHA color number of ≤ 300, the APHA color number being determined according to DIN EN ISO 6271:2016-05; wherein the Ti containing compound comprises a Ti containing alcoholate selected from the group of Ti(O-alkyl)4, wherein each alkyl group is independently selected from branched or unbranched C1 to C6 alkyl. The present invention also relates to a process for preparation of said zeolitic material, a molding comprising said zeolitic material, the use of said molding and a process for oxidizing an organic compound comprising bringing an organic compound in contact with a catalyst comprising a molding..

The invention relates to the field of molecular sieve preparation, in particular to a hierarchical pore TS-1 molecular sieve as well as a preparation method and application thereof. According to the preparation method provided by the invention, in the TS-1 molecular sieve synthesis process, a certain amount of silanization reagent is added into a gel system, in the crystallization process, the silanization reagent, a titanium source and a silicon source participate in condensation polymerization together, and a hydrophobic chain segment can form a dynamic micelle structure in the synthesis system; and directionally regulating and controlling pore formation on the outer surface and the peripheral area of the crystal. After post-treatment roasting, organic components in the silanization reagent are removed, so that a hierarchical pore structure is formed in a molecular sieve framework, and the specific surface area of the catalyst and the reactant diffusion efficiency are effectively improved. The catalyst is used for catalyzing olefin epoxidation, the conversion rate of substrate olefin reaches 36.5%, and the selectivity of diol reaches 98%.

The present invention belongs to the technical field of organic ester preparation, and in particular to a kind of Ti / Zr-Si porous molecular sieve and its preparation method and catalytic esterification method, the preparation method comprises the following steps: (1) silicon source, titanium source, zirconium source, structure directing agent, water are mixed, and heated hydrolysis dispersion is obtained under normal pressure to obtain precursor gel I, and organic acid source is added to precursor gel I to obtain precursor gel II; (2) precursor gel II is transferred to reactor, hydrothermally reacted under autogenous pressure, and finally cooled, depressurized, filtered, dried and roasted to obtain Ti / Zr-Si porous molecular sieve. The present invention can improve the diffusion performance in molecular sieve crystal, improve the accessibility of active centers in molecular sieve crystal, and regulate the amount of Lewis acid produced by surface hydroxyl groups by introducing organic acid source in molecular sieve preparation system. Therefore, catalytic efficiency and catalytic stability when using Ti / Zr-Si porous molecular sieve catalytic esterification reaction are effectively improved.

The invention relates to a method for preparing pore-expanded mesoporous silica nanoparticles, comprising: - a first step involving preparing mesoporous silica nanoparticles using surfactants as templating agents; - and a second step of degradation of the silica nanoparticles using an amino tri-alcohol of general formula NR1OH R2OHR3OH, wherein R1, R2 and R3 represent identical or different organic groups, preferably hydrocarbon groups and particularly aliphatic chains with a chain length of less than four, and more preferably 2,2',2''-nitrilotriethanol or triethanolamine, the second step being carried out in water.

A titanium silicalite molecular sieve with a hierarchical porous structure is provided. The spectral peaks of the 1H MAS NMR spectrum of the titanium silicalite molecular sieve in the chemical shift range of 1-6 ppm are separated to obtain five spectral peaks whose chemical shifts corresponding to the peak positions are 1.8±0.1 ppm, 2.2 ppm±0.1 ppm, 2.8 ppm±0.1 ppm, 3.8±0.1 ppm and 4.6±0.1 ppm, respectively. The peak areas of the peaks satisfy specific proportional relationships. The molecular sieve has significantly enhanced anti-deactivation performance and can significantly improve the cyclohexanone oxime conversion rate and the caprolactam selectivity when used in the cyclohexanone oxime gas-phase Beckmann rearrangement reaction.

The invention provides a titanium species self-supporting molecular sieve with an open structure as well as a preparation method and application of the titanium species self-supporting molecular sieve. The invention relates to a method for synergistically constructing micropore-mesopore hierarchical pore and open structure framework titanium species in a titanium silicalite molecular sieve without additional additives. According to the invention, through regulation and control of aging / crystallization conditions (temperature and time) and modes (hydrothermal and microwave-assisted), silicon / titanium source types and component proportions, intermediate-state Pentasil silicon molecular sieves with different crystalline states are obtained, and the intermediate-state Pentasil silicon molecular sieves have oriented self-supporting morphology and capture titanium to form open-structure framework titanium. And finally, cooperative regulation and control of the titanium silicalite molecular sieve morphology / pore structure and the titanium active center are realized under the condition of no additional additive. The TiO2-SPP molecular sieve prepared by the method has the morphology of staggered growth of nanosheets, large external specific surface area, large pore volume and a large amount of high-activity open-structure (Ti (OSi) 3 (OH)) framework titanium species.

An alkali metal ion modified titanium silicalite zeolite for gas phase epoxidation of propylene and hydrogen peroxide and a preparation method thereof. The method includes, at first step: preparing an alkali metal hydroxide modification solution; at second step: conducting controlled hydrothermal treatment on a TS-1 zeolite matrix by using an alkali metal hydroxide solution; and at third step: conducting post-treatment on the hydrothermally modified TS-1 zeolite, including solid-liquid separation, washing, drying and calcining. In the washing process, the modified TS-1 zeolite wet material is washed with a low concentration alkali metal hydroxide solution; alkali metal ions are reserved on the silicon hydroxyl of the modified titanium silicalite zeolite; and an infrared characteristic absorption band of a framework titanium active center modified by the alkali metal ions is in a range above 960 cm−1 and below 980 cm−1.

The invention discloses a synthesis method of a hierarchical pore molecular sieve nanosheet, and belongs to the technical field of molecular sieve synthesis. Comprising the following steps: mixing a tetrapropylammonium hydroxide solution, tetraethyl orthosilicate and water, stirring for pre-hydrolysis, standing for aging, then adding a nanocellulose aqueous dispersion, carrying out ultrasonic treatment, then adding urea, water and a metal source, stirring, and finally crystallizing at 150-200 DEG C for 12-30 hours, after crystallization is finished, carrying out solid-liquid separation on a product, and washing, drying and roasting a solid product to obtain the hierarchical pore molecular sieve nanosheet. According to the invention, nano-crystalline cellulose and urea are compounded and introduced into a molecular sieve synthesis system for the first time, and controllable growth of flaky morphology and integrated construction of intracrystalline mesopores are realized in situ under a fluoride-free condition. The method is green and environment-friendly, raw materials are cheap, the process is simple, and the method has extremely high industrial application value.

According to the molecular sieve activation device, a roller is arranged to be of an interlayer structure, a first activation space and a secondary activation space which are used for conveying a molecular sieve and drying and activating the molecular sieve are arranged between a first roller body and a second roller body and between the second roller body and a third roller body respectively, and the molecular sieve can be effectively protected through the arrangement mode; when the roller rotates and turns over the molecular sieve in the first activation space, the molecular sieve only moves in the narrow first activation space, cannot be driven to a high position by the stirring blade and then rises and falls off from the high position, and is not easy to damage; the molecular sieve can be secondarily activated, heat energy is fully utilized, the drying effect is improved, the length of the roller can be effectively reduced, and the occupied area of equipment is reduced.

The invention relates to a titanium silicalite molecular sieve and a preparation method thereof, and the method comprises the following steps: S1, mixing unroasted titanium silicalite molecular sieve raw powder, a first binder, water and an optional first surfactant, carrying out first molding, and carrying out first roasting treatment on a solid product obtained by the first molding, the titanium silicalite molecular sieve microspheres are obtained; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second surfactant, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; and S4, carrying out secondary roasting treatment on the titanium silicalite molecular sieve pre-product. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has relatively high mechanical strength and porosity.

The invention relates to a titanium silicalite molecular sieve and a preparation method thereof, and the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder, a first binder, water and an optional first surfactant, carrying out first molding, and carrying out first roasting treatment on a solid product obtained by the first molding to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second surfactant, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging treatment on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; s4, carrying out secondary roasting treatment on the titanium silicalite molecular sieve pre-product; a pore-foaming agent is added in the first forming and / or the second forming. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has relatively high mechanical strength, forms a hierarchical porous structure in the titanium silicalite molecular sieve, and has relatively high porosity and specific surface area.

The invention relates to a titanium silicalite molecular sieve, a preparation method thereof and a propylene epoxidation reaction method, and the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder with a first solution containing a first binder, alkali and an optional first auxiliary agent, and carrying out first molding to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second auxiliary agent, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; s4, carrying out roasting treatment on the titanium silicalite molecular sieve pre-product; the pH value of the first solution is 8-13. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has a porous structure, has the characteristic of high mechanical strength, has good epoxidation catalytic activity, is used for propylene epoxidation reaction, and has relatively good catalytic performance and stability.

The invention discloses a pore structure regulation and control method of a silicate zeolite molecular sieve, and belongs to the technical field of pore structure regulation and control, and the method comprises the following steps: preparing a composite guiding agent: carrying out surface coating treatment on magnetic colloid microspheres; then adding ethylenediamine tetraacetic acid to obtain an ethylenediamine tetraacetic acid-magnetic colloid microsphere compound; then dropwise adding a diazabicyclo structure directing agent to form a composite template agent; adding a silicon source, an aluminum source, an alkali source and a guiding agent into deionized water to obtain synthetic gel; placing the synthesized gel in a pulsed magnetic field generating device, and applying a pulsed magnetic field; putting the synthesized gel into a crystallization furnace for crystallization; and centrifuging, washing, drying and roasting the product to obtain the silicate zeolite molecular sieve. The prepared silicate zeolite molecular sieve catalyzes alkylation reaction between benzene and cyclohexene, the conversion rate of cyclohexene can reach 97.8% or above, and the selectivity of cyclohexylbenzene can reach 85.6% or above.

The present invention relates to a one-dimensional silicate material ZEO-2 with a novel structure and a three-dimensional silicate molecular sieve ZEO-3 obtained by roasting ZEO-2 and a synthesis method therefor and a use thereof. The X-ray powder diffraction characteristics and crystal structures of the two silicate materials are represented. The one-dimensional silicate ZEO-2 can be synthesized by a simple method. The molecular sieve ZEO-3 can be obtained by calcining the one-dimensional silicate ZEO-2 to cause topological condensation. ZEO-2 can be used as a silicon source or a precursor in the synthesis of a novel molecular sieve. The molecular sieve ZEO-3 has good thermal stability and can be used as an adsorbent or a catalyst.

The invention relates to a titanium silicalite molecular sieve, a preparation method thereof and a method for preparing epoxypropane, and the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder, a first binder, water and an optional first surfactant, and performing to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres with a second solution containing a second binder, alkali and an optional second surfactant, and carrying out molding treatment to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; s4, carrying out roasting treatment on the titanium silicalite molecular sieve pre-product; the pH value of the second solution is 8-13. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has a porous structure, so that the material is endowed with excellent mechanical strength, and the catalytic activity of the titanium silicalite molecular sieve in the production of epoxypropane is also remarkably improved.

The invention relates to a titanium silicalite molecular sieve, a preparation method thereof and a method for preparing epoxypropane, and the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder, a first main binder, water, an optional first binder and an optional first surfactant, and carrying out first molding to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second surfactant, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; and S4, carrying out roasting treatment on the titanium silicalite molecular sieve pre-product. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has a porous structure and high mechanical strength, is used for propylene epoxidation reaction, and can obtain relatively high raw material conversion rate and target product selectivity.