118results about "Molecular-sieve compounds" patented technology

The application provides a coal-based solid waste flotation-metallurgy-material resource comprehensive utilization process method and application, and belongs to the technical field of coal-based solid waste comprehensive utilization.The coal-based solid waste is first separated by flotation to obtain residual carbon and tail ash; then the tail ash is dried and alkali melted to become active material; then the active material is leached and filtered to obtain leaching liquid and leaching residue, and Li and Ga in the leaching liquid are adsorbed and enriched; the adsorbed leaching liquid is adjusted in silicon-aluminum ratio, hydrothermally crystallized, filtered and high-temperature calcined to obtain mesoporous molecular sieve; the filtered silicon-containing alkali liquor is carbonized and calcined to obtain white carbon black; the tail ash and the leaching residue are mixed, and through moisture adjustment and curing process, a geopolymer product is obtained.The method in the application does not produce waste residue and waste water in the implementation process, finally obtains four products of Li and Ga enrichment product, geopolymer product, mesoporous molecular sieve and white carbon black, realizes full and comprehensive utilization of the coal-based solid waste, and has good environmental benefits and great significance.

The present invention discloses a large-particle multi-level pore TS-1 molecular sieve for catalytic oxidation reaction in the field of molecular sieve catalytic materials, and its preparation method and use. When preparing the TS-1 molecular sieve, a silicon source, a titanium source, a template, a seed crystal and water are used to form a mixed dispersion, and a one-step hydrothermal crystallization is adopted. After filtering, washing, drying and roasting, a large-particle multi-level pore TS-1 molecular sieve is obtained. The molecular sieve has a cross-shaped long strip, a particle size of 6 to 10 μm, and a specific surface area of ​​≥370 m 2 / g, pore volume ≥0.4ml / g, average pore size 2-3nm. The present invention provides a large-particle multi-level pore TS-1 molecular sieve with excellent catalytic activity and stability, which can be used in the reaction of oxidizing vinyl sulfite to vinyl sulfate using dichloromethane as solvent and hydrogen peroxide as oxidant, has a long service life, is easy to recycle, has good product selectivity and high conversion rate.

The present invention provides a facile heteroepitaxial method for growing conductive zinc-catecholate frameworks on bio-fibers with biomimetic connections, which is beneficial to fabricate biocompatible and high-performance photodetectors and chemiresistors, and the corresponding bio-fiber based metal-organic framework. In this method, a conductive layer is first introduced on the surface of polysaccharide bio-fibers, before well-aligned zinc oxide nanoarrays were densely constructed on the bio-fibers by a physiological coagulation mechanism. The obtained fibrous materials may be used in devices, including in electronic components, having the advantages of good stability, environmental-friendly, flame retardancy, and high response.

The invention relates to a monatomic iron catalyst for electrochemical reduction of carbon dioxide, and a preparation method and application thereof. In particular, the present invention relates to a process for the preparation of Fe (II) doped Zn-ZIF precursor materials and to the use thereof in the preparation of catalysts comprising Fe monatomic atoms, obtained on an N-doped carbon matrix from the pyrolysis of such Fe (II) doped Zn-ZIF precursor materials.

The invention relates to the field of molecular sieves, in particular to a titanium silicalite molecular sieve TS-1 nanosheet and a preparation method and application thereof.The titanium silicalite molecular sieve TS-1 nanosheet is prepared by using tetrapropylammonium hydroxide, tetraethyl orthosilicate, tetrabutyl titanate and urea as raw materials through crystallization and calcination. A urea-assisted synthesis method is adopted, urea can be spontaneously dispersed on the surface, perpendicular to the b axis, of a crystal, growth of the crystal in the direction of the b axis is inhibited, and then the sheet-shaped titanium silicalite molecular sieve TS-1 is formed after calcination. According to the invention, isopropanol is not required to be used as a solvent and a regulator for hydrolysis of tetraethyl orthosilicate and tetrabutyl titanate, so that the purpose of synthesizing the titanium silicalite molecular sieve TS-1 nanosheet at low cost is achieved, and the technical defect of structural collapse caused by calcination in the prior art is overcome.

The present disclosure refers to a process for the preparation of a dry crystalline zeolitic imidazolate framework (ZIF) which comprises: a) spray drying a metal oxide and an imidazole ligand in the presence of a solvent, wherein the reaction of the metal oxide with the imidazole ligand to yield the ZIF and the drying of the obtained ZIF take place simultaneously inside the spray dryer, and b) collecting the formed dry crystalline ZIF.

The invention provides a mesoporous silicate molecular sieve as well as a preparation method and application thereof, and belongs to the technical field of molecular sieves. The framework component of the mesoporous silicate molecular sieve provided by the invention is only silica, 14 kinds of topology independent atoms are contained in the framework, a 36-membered ring one-dimensional mesoporous channel system is contained in the crystal structure of the mesoporous silicate molecular sieve, and the material is good in thermal stability and can be applied as a catalyst or an adsorbent.

The application discloses a preparation method of Al-doped SiO2 molecular sieve and application thereof. The application comprises the following steps: 1, respectively adding an aluminum source and a silicon source into a sodium hydroxide aqueous solution, stirring uniformly to obtain a mixed solution, then adding a template agent into the mixed solution, and stirring for 8-16 hours to obtain a reaction mixture; 2, transferring the mixture prepared in the step 1 into a polytetrafluoroethylene-lined stainless steel reaction kettle, crystallizing at a temperature of 150-200 DEG C for 24-72 hours; 3, washing the reaction mixture crystallized in the step 2 for multiple times, then drying in an oven, and obtaining a light yellow powder after calcination; 4, dissolving the prepared light yellow powder in a 0.5-3 mol / L ammonium salt solution, heating and stirring, cooling and washing, and drying and calcining to obtain the Al-SiO2 molecular sieve. The catalyst prepared by the application has low preparation cost and is easy to recycle, can effectively catalyze the methylation reaction of naphthalene under normal pressure, and has improved conversion rate and selectivity, and has a good industrial application prospect.

The purpose of the present invention is to provide an adsorbent having exceptional adsorption performance, a method for recovering a target substance using the adsorbent, and a method for manufacturing an adsorbent suitable for manufacturing the adsorbent. In order to achieve this purpose, the present invention provides an adsorbent comprising a porous body having a co-continuous structure formed by macropores (2) and a ceramic skeleton (1) that contains mesopores (3), and a sulfur-atom-containing group for modifying the surface of the ceramic skeleton, wherein the amount of the sulfur-atom-containing group contained in the adsorbent is 0.5-3.5 mmol / g, and the water absorption rate of the adsorbent is 8% or higher.

The invention relates to a TS-1 molecular sieve, a preparation method thereof and application of the TS-1 molecular sieve in phenol hydroxylation reaction, and according to the preparation method, tetraethyl orthosilicate, tetrapropylammonium hydroxide, tetrabutyl titanate and amino acid are used as raw materials, crystallization is performed firstly, and then calcination is performed to prepare the TS-1 molecular sieve. The TS-1 molecular sieve catalyst is rich in a large amount of framework titanium, has high-activity hexa-coordinated titanium species, and can be used for efficient catalysis of phenol hydroxylation reaction. Compared with the prior art, the catalyst has excellent catalytic performance and excellent para-selectivity, and is simple in process, low in cost, good in stability and easy to popularize.

The invention discloses an in-situ crystallization device for a Bruker 7mm probe as well as a preparation method and application of the in-situ crystallization device, and belongs to the field of catalysis. The in-situ crystallization device comprises a pipe body and a cover; the open end of the pipe body and the cover are combined through threads and sealed through an O-shaped ring. The in-situ crystallization device provided by the invention has the characteristics of high temperature resistance, high pressure resistance and corrosion resistance, and solves the problem that in-situ characterization is difficult in the molecular sieve crystallization process. The manufacturing method is simple in process and low in cost, and large-scale production and commercialization can be achieved.

The application belongs to the field of molecular sieve material preparation, and relates to a method for synthesizing micron TS-2 molecular sieve with hierarchical pores, comprising the following steps: firstly, a silicon source, a titanium source, hydrochloric acid and deionized water are mixed according to a specific proportion, a high-dispersion SiO2-TiO2 precursor powder is obtained through a spray drying device, then the precursor powder is added into a TBAOH solution to form an initial gel, micron TS-2 molecular sieve is obtained by controlling hydrothermal crystallization conditions; then the micron TS-2 molecular sieve is fully mixed with an organic alkali solution and deionized water, and stirring is performed to obtain a mixed slurry; the mixed slurry is transferred into a crystallization kettle with a stirring device, and is subjected to a high-temperature crystallization process, and then is subjected to washing, separation, drying and calcination to obtain a micron TS-2 molecular sieve product with a hierarchical pore structure. The organic alkali post-treatment strategy is adopted, mesoporous structures are successfully introduced while the micron size is maintained, and the mass transfer efficiency and active site accessibility of the molecular sieve are significantly improved.

Provided is a method of preparing mesopore Y zeolite catalysts with larger mesopore sizes. The method employs swelling agents, and optionally cosolvents. The larger mesopores improve accessibility for mass transport of bulky reactants. In the preparation a swelling agent is used in combination with cetyltrimethylammonium bromide (CTAB). Cosolvents can also be used to affect a strong swelling effect.

The purpose of the present invention is to provide an adsorbent having exceptional adsorption performance, a method for recovering a target substance using the adsorbent, and a method for manufacturing an adsorbent suitable for manufacturing the adsorbent. In order to achieve this purpose, the present invention provides an adsorbent comprising a porous body having a co-continuous structure formed by macropores (2) and a ceramic skeleton (1) that contains mesopores (3), and a sulfur-atom-containing group for modifying the surface of the ceramic skeleton, wherein the amount of the sulfur-atom-containing group contained in the adsorbent is 0.5-3.5 mmol / g, and the water absorption rate of the adsorbent is 8% or higher.

The present invention relates to the field of catalytic material synthesis, and discloses a small-grain ZSM-12 molecular sieve and a preparation method thereof, wherein the small-grain ZSM-12 molecular sieve adopts a silica-alumina gel (especially an acid-treated silica-alumina gel) with a large silicon-alumina ratio as a composite silicon-alumina source, and uses an acid-treated silica-alumina gel, an inorganic base, a template agent 1,4-bis(N-methylpyrrolidine)butane halide, and water as raw materials for crystallization. The synthesized ZSM-12 molecular sieve has high crystallinity, an adjustable silicon-alumina ratio, a regular morphology, and a grain size of 100-200nm.

The invention provides an isomorphous substituted titanium silicalite molecular sieve as well as a preparation method and application thereof, and belongs to the technical field of molecular sieve preparation. The preparation method comprises the following steps: firstly, mixing a pure silicon layered precursor and an ammonium fluoride organic solution, and reacting to obtain a chambering material; and dispersing the pore-enlarging material in ethanol, adding a titanium source for reaction, drying and roasting to obtain the isomorphous substituted titanium silicalite molecular sieve. According to the method, the pure silicon layered precursor is subjected to pore expansion by adopting the ammonium fluoride organic solution, so that compared with a traditional ammonium fluoride aqueous solution, the damage to the structure of the layered precursor is avoided, and the integrity of a molecular sieve framework is favorably kept. According to the invention, the pore-enlarging material is dispersed in ethanol, and then the titanium source is added for reaction, so that generation of non-framework titanium is inhibited, and more framework titanium active centers can be formed.

The invention relates to a Ti-MCM-41 mesoporous molecular sieve material preparation method and application, the Ti-MCM-41 mesoporous molecular sieve material preparation method comprises the following preparation steps: S1, adding absolute ethyl alcohol into a template agent solution, slowly dropwise adding a titanium source and a silicon source, and reacting to obtain a mixed solution; s2, adjusting the mixed solution obtained in the step S1 to be acidic, and standing at 0 DEG C to obtain a Ti-MCM-41 mesoporous molecular sieve precursor; and S3, roasting the Ti-MCM-41 mesoporous molecular sieve precursor obtained in the step S2 to obtain the Ti-MCM-41 mesoporous molecular sieve. Compared with the prior art, the Ti-MCM-41 mesoporous molecular sieve material is prepared under the acidic and 0 DEG C conditions for the first time. The energy consumption is greatly reduced, more importantly, the operation method is simplified, the equipment requirement is reduced, and a better technical effect is achieved.

This invention discloses a gallium-silicon molecular sieve, its preparation method, and its application. The chemical composition of the gallium-silicon molecular sieve is SiO2·nGa2O3, where n is the molar ratio of Ga2O3 to SiO2, and the value of n ranges from 0.001 to 0.01. The morphology of the gallium-silicon molecular sieve is a coffin-like lamellar morphology, and its average thickness along the b-axis is 25-100 nm. The preparation method of the gallium-silicon molecular sieve includes the following steps: (1) mixing a silicon source, a template agent, a growth regulator, and water to prepare a seed crystal suspension; (2) mixing the silicon source, gallium source, template agent, water, growth regulator, and the seed crystal suspension to obtain an initial gel, which is then recrystallized to obtain the gallium-silicon molecular sieve. The molecular sieve provided by this invention is used as a catalyst in the alkylation reaction of benzene and methanol, exhibiting high benzene conversion rate and high selectivity for the target product.

The invention discloses a method for fixed-point modulation of acidity of a molecular sieve. The method comprises the following steps: (1) dissolving a proper amount of cinnamate in benzene, uniformly stirring, and fully dissolving; (2) impregnating a molecular sieve with the solution obtained in the step (1), and filtering the molecular sieve after impregnation; wherein the pore diameter of the molecular sieve is 0.4 nm to 0.9 nm; (3) purging the molecular sieve filtered out in the step (2) with hot nitrogen, and naturally cooling to room temperature after purging; and (4) cleaning the molecular sieve obtained in the step (3) with deionized water to obtain the acid center modulated molecular sieve. According to the invention, only the acid center at the cross position of the molecular sieve pore channel is modified, the acid center at the straight-through pore channel is not influenced, and the smoothness of the pore channel is not influenced.

The present invention discloses a molybdenum-containing mesoporous alumina molecular sieve and its preparation method and application. Based on the weight of the molybdenum-containing mesoporous alumina molecular sieve, the molybdenum content is 10wt% to 35wt%, preferably 20wt% to 25wt%; the specific surface area of ​​the molybdenum-containing mesoporous alumina molecular sieve is 250 to 450m 2 / g, pore volume is 0.20~0.35cm 3 / g. The present invention successfully introduces molybdenum into the mesoporous alumina molecular sieve in one step through a one-step gel method, and by using an additive, the interaction between alumina and molybdenum particles is enhanced, the molybdenum is evenly dispersed on the alumina, the accumulation of molybdenum on the alumina is avoided, the increase of particle size is suppressed, and combined with the regulation of preparation conditions, a molybdenum-containing mesoporous alumina molecular sieve with high molybdenum dispersion and high specific surface area can be obtained at a lower temperature. The molybdenum-containing mesoporous alumina molecular sieve of the present invention is particularly suitable as a catalytic material for the hydrodesulfurization of sulfur-containing hydrocarbons.

The present application relates to a kind of method for preparing zeolite molecular sieve with steel slag, belong to metallurgical resource comprehensive utilization technical field.The preparation method includes: in the process of slagging in steel smelting production, adding modifier to steel slag, obtaining modified steel slag, magnetic separation, obtaining tailing of magnetic separation, after grinding, leaching in acidic solution, the pH of leaching process is maintained constant in one range between 0~7, obtain leaching solution and leaching tailing;The above-mentioned leaching solution is adjusted to pH 7~7.5 with alkaline solution, and silicon-aluminum gel is obtained;Alkaline solution and structure directing agent are added to the above-mentioned silicon-aluminum gel, stirred and reacted, and zeolite molecular sieve precursor solution is obtained, and zeolite molecular sieve is obtained by crystallization.The present application replaces natural silicon-aluminum source with steel slag, and the raw material source is wide, the cost is low, the process flow is simple, the high-value utilization of steel slag can be realized, and the application economy and environmental benefits of zeolite material in the field of CO2 capture are significantly improved.

To provide a uranium adsorbent that uses porous silica and selectively adsorbs uranium, a method for producing the same, a method for extracting uranium from an aqueous solution under test by using the same, and a method for recovering uranium from a uranium-containing mineral.SOLUTION: A uranium adsorbent has aggregate of particles composed of porous silica having a hexagonal structure. The aggregate has a hierarchical structure including micropores, mesopores and macropores. The aggregate has a BET specific surface area of 250 m2 / g or more and 300 m2 / g or less and a pore volume of 0.3 cm3 / g or more and 0.5 cm3 / g or less. The aggregate has a plurality of grooves among the particles on its surface and adsorbs or desorbs uranium selectively.SELECTED DRAWING: Figure 1

A method for producing an epoxide using a titanium-containing silicon oxide catalyst that includes a salt at a predetermined concentration.

To provide an organometallic structure having excellent adsorption performance for volatile organic compounds (VOCs) and at the same time, having excellent outgassing prevention performance for adsorbed VOCs.SOLUTION: This invention is a zirconium-based organometallic structure (MOF) characterized by simultaneously securing adsorption performance and outgassing prevention performance for VOCs by introducing an amine group (-NH2) into the crystal structure.SELECTED DRAWING: Figure 4

Provided is a method of preparing mesopore Y zeolite catalysts with larger mesopore sizes. The method employs swelling agents, and optionally cosolvents. The larger mesopores improve accessibility for mass transport of bulky reactants. In the preparation a swelling agent is used in combination with cetyltrimethylammonium bromide (CTAB). Cosolvents can also be used to affect a strong swelling effect.

This invention relates to the field of molecular sieves, specifically to titanium-silicon molecular sieve TS-1 nanosheets, their preparation method, and applications. The invention uses tetrapropylammonium hydroxide, tetraethyl orthosilicate, tetrabutyl titanate, and urea as raw materials. The process involves crystallization followed by calcination to prepare titanium-silicon molecular sieve TS-1 nanosheets. This invention employs a urea-assisted synthesis method, where urea spontaneously disperses on the surface of the crystals perpendicular to the b-axis, inhibiting crystal growth along the b-axis direction. This results in the formation of sheet-like titanium-silicon molecular sieve TS-1 after calcination. This invention eliminates the need for isopropanol as a solvent and the regulation of hydrolysis of tetraethyl orthosilicate and tetrabutyl titanate, achieving low-cost synthesis of titanium-silicon molecular sieve TS-1 nanosheets and overcoming the technical defects of existing technologies where calcination leads to structural collapse.

The invention discloses an all-silicon molecular sieve and a preparation method thereof. The all-silicon molecular sieve is a hollow spherical particle material, the average particle size is 153-167 nm, the thickness of a hollow shell layer is 4-15 nm, the specific surface area is 430-603 m < 2 > / g, the average pore size is 6.27-8.89 nm, and the pore volume is 0.45-0.94 cm < 3 > / g. The invention also discloses a preparation method of the all-silicon molecular sieve. The all-silicon molecular sieve disclosed by the invention has relatively high specific surface area, relatively large pore volume, relatively low density, excellent chemical stability and surface permeability, relatively high biocompatibility and the like, and the all-silicon molecular sieve material is used for adsorbing and removing trace-level non-metal boron impurities through a chelation effect, so that the trace-level non-metal boron impurities can be adsorbed and removed. The removal efficiency of impurities is 90.6-98.9%, and the adsorbent is superior to existing adsorbents such as industrial activated carbon and the like.

To provide modified metal-organic framework (MOF) materials, methods of preparing the same, and processes using the same.SOLUTION: A modified MOF of the invention is modified by impregnating a MOF with an inorganic metal salt. The starting MOF comprises at least one linker or ligand, which comprises an aryl amino group as part of its structure. The modified MOF is able to adsorb either basic or acidic toxic industrial compounds (TICs). The modified MOF can be used to remove TICs from various gaseous streams such as air.SELECTED DRAWING: None

The present invention provides a low-condensation biodiesel and a preparation method thereof, belonging to the technical field of bio-oil products. The preparation method comprises the following steps: (1) acid reduction process: (2) pre-hydrogenation process; (3) deep hydrogenation refining process; (4) hydrogenation isomerization process: the product of deep hydrogenation refining is subjected to the hydrogenation isomerization process to reduce the condensation point. The preparation method of isomerization hydrogenation catalyst comprises the following steps: a. mixing a microporous molecular sieve with a NaOH aqueous solution, reflux stirring, cooling, suction filtering, washing with water to neutrality, and drying to obtain a pre-treated molecular sieve; b. mixing the pre-treated molecular sieve with H2PtCl6, stirring to a paste, standing, and drying to obtain a catalyst precursor; c. heating the catalyst precursor, heat-insulating and roasting to obtain an isomerization hydrogenation catalyst; (5) performing a deep hydrogenation refining process again to obtain a low-condensation biodiesel. The preparation method of the present invention has a high yield, and the prepared low-condensation biodiesel meets the use standard.

The application discloses a molecular sieve membrane and a preparation method and application thereof in low-abundance protein enrichment, and the preparation method comprises the following steps: 1) polishing a support body to be smooth, drying after ultrasonic treatment; 2) adding an alcohol solution to the dried support body, then adding a certain amount of a coupling agent and ammonia water, taking out the support body after stirring, and drying the support body for standby use; 3) adding an alkali source into deionized water, completely dissolving, then adding a template agent, a stabilizer and a surfactant, and dissolving; 4) adding a silicon source and an alkali metal source into step 3), dissolving, then adding the dried support body in step 2), crystallizing at room temperature, then hydrothermally crystallizing, taking out the support body after the hydrothermal crystallization, washing, drying and calcining, so that the molecular sieve membrane is obtained. The molecular sieve membrane is simple in operation, the surface of the synthesized molecular sieve membrane is continuous and dense, the surface of the molecular sieve membrane retains the superior protein adsorption performance of the molecular sieve material, and the molecular sieve membrane can effectively improve the protein identification number.