62results about "Molecular-sieve silicates" patented technology

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.

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 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 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.

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.

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.

The application provides a kind of hierarchical pore SBA-15 molecular sieve and its preparation method, the preparation method includes the following steps: P123, pore expander and inorganic acid are dissolved in water to obtain a mixed solution, silicon source is added and hydrolyzed in the mixed solution to obtain a hydrolysate and mother liquor;Repeat the following operation: the mother liquor obtained in the last step is subjected to ethanol removal treatment, then P123, pore expander and inorganic acid are added and dissolved, silicon source is added and hydrolyzed again, and the solid and mother liquor are obtained again;S3: the hydrolysate obtained in S1 and S2 is combined, and the combined solid product is subjected to hydrothermal crystallization by adding the mother liquor, the crystallization product is dried and calcined to obtain the hierarchical pore SBA-15 molecular sieve.The preparation method of the application has high synthesis efficiency, low cost and less pollution, and the synthesized molecular sieve contains hierarchical pore structure and can realize cross-scale penetration.

The application belongs to the technical field of epoxy compound preparation, and particularly relates to a titanium-silicon molecular sieve TS-1, a preparation method thereof and an olefin epoxidation method. The preparation method comprises the following steps: S1, hydrolysis dispersion: hydrolysis and dispersion of a mixture of a silicon source, a titanium source, a structure directing agent, a monosaccharide compound and water to obtain a mixed system I; S2, water-silicon ratio regulation: adding the mixed system I into a concentration kettle, reducing the water-silicon ratio of the mixed system I through distillation dehydration to obtain a mixed system II; S3, crystallization reaction: transferring the mixed system II into a closed crystallization kettle to crystallize under self-generated pressure, and finally filtering, drying and calcining to obtain the titanium-silicon molecular sieve TS-1. The monosaccharide compound introduced in the mixed system I contains rich hydroxyl groups, which can form hydrogen bond action with the silicon / titanium hydroxyl groups in the molecular sieve precursor, thereby affecting the growth process of the molecular sieve crystal grains, and on this basis, the nucleation process of the molecular sieve can be strengthened by regulating the water-silicon ratio.

Titanium silicalite molecular sieve with hierarchical porous structure. Titanium silicalite molecular sieve, 1 Peak fitting of the peaks in the 1-6 ppm range in the H MAS NMR spectrum yielded five peaks with chemical shifts of 1.8±0.1 ppm, 2.2±0.1 ppm, 2.8±0.1 ppm, 3.8±0.1 ppm, and 4.6±0.1 ppm, respectively, with the peak areas satisfying a specific proportional relationship. Molecular sieves have significantly improved deactivation resistance, and when used in the vapor-phase Beckmann rearrangement of cyclohexanone oxime, they can significantly improve the conversion of cyclohexanone oxime and the selectivity for caprolactam.

This disclosure relates to a titanium-silicon molecular sieve with a hierarchical porous structure, a method for preparing the same, and a method for preparing caprolactam. The titanium-silicon molecular sieve has the following characteristics: 1 ¹H MAS NMR characteristics: The peak area at the chemical shift position of 1.8±0.1ppm is denoted as A1, the peak area at the chemical shift position of 2.2ppm±0.1ppm is denoted as A2, the peak area at the chemical shift position of 2.8ppm±0.1ppm is denoted as A3, the peak area at the chemical shift position of 3.8±0.1ppm is denoted as A4, and the peak area at the chemical shift position of 4.6±0.1ppm is denoted as A5; X1 is defined as any value between 0.5 and 2.2 as in Equation (1): X1=(A2+A3) / A1 (Equation (1)); X2 is defined as any value between 0.1 and 1.2 as in Equation (2): X2=A4 / A1 (Equation (2)); X3 is defined as any value between 0.05 and 0.65 as in Equation (3): X3=A5 / A1 (Equation (3)).

The invention relates to a method for producing a composite material with a support structure and a coating on the surface of the support structure. The coating comprises crystals of a zeolite material or a material similar to zeolite as active components, and inter-crystalline meso- and / or macro-pores are formed in the coating. The invention is characterized in that the method has the following steps: a) providing a suspension which contains nano-scale starting crystals made of a zeolite material or a material similar to zeolite and precursor compounds of the zeolite material or the material similar to zeolite, b) applying the suspension provided in step a) onto the surface of the support structure, c) solidifying the suspension applied in step b) by at least partly removing the solvent which forms the liquid phase of the suspension in order to obtain a coating which contains the starting crystals and the precursor compounds, and d) keeping the coating obtained in step c) on the surface of the support structure in a steam-containing atmosphere at an increased temperature such that the obtained precursor compounds are converted into a zeolite material or a material similar to zeolite and together with the starting crystals forms the coating which comprises the crystals of a zeolite material or a material similar to zeolite.

The application provides a silicon-aluminum material and a preparation method thereof. After being calcined at 500-700 DEG C, the silicon-aluminum material has the following properties: the content of silicon dioxide is 20-40 wt%, the pore volume is no less than 0.70 mL / g, and the specific surface area is 280-400 m 2 / g. The preparation method of the silicon-aluminum material comprises the following steps: (1) mixing a first silicon source, a first additive and water to obtain a sol; (2) mixing the sol with alcohol and performing heat treatment to obtain a first material flow; (3) reacting a second silicon source, an acidic aluminum-containing compound and an alkaline aluminum-containing compound to obtain a mixed solution; (4) mixing the mixed solution with a second additive to obtain a slurry; (5) mixing the slurry with the first material flow and performing hydrothermal treatment, and then performing washing, drying and calcination to obtain the silicon-aluminum material. The silicon-aluminum material has the characteristics of molecular sieve, hierarchical pore distribution and high B acid content, and is suitable for being used as a carrier of a catalytic material.

A method of making a molecular sieve may include: reacting a source selected from the group consisting of: a source of a tetrahedral element in the presence of a structure directing agent (SDA) selected from the group consisting of: Ar+-L-Ar, Ar+-L-Ar-L-Ar+, Ar+-L-Ar-L-NR3+, and ArAr+-L-Ar+Ar, where Ar+ is to a N-containing cationic aromatic ring, Ar is to a non-charged aromatic ring, L is a methylene chain of 3-6 carbon atoms, NR3+ is to a quaternary ammonium, and ArAr+ and Ar+Ar are a fused aromatic ring structure comprising both a N-containing cationic portion and a non-charged portion, to produce the molecular sieve.

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 with a pore filling agent, and drying to obtain pore-filled titanium silicalite molecular sieve raw powder; s2, mixing the titanium silicalite molecular sieve raw powder filled with the pore channels, 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; s3, 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; s4, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; and S5, 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, good pore connectivity, high porosity and large specific surface area.