75results 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 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 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 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 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.

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 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.

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

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 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.

The invention discloses a preparation method and application of a functionalized mesoporous material SBA-15, and relates to the field of chemical synthesis and photoelectrocatalysis materials.Organic functionalization is conducted on SBA-15 through a grafting method, and an amino-functionalized mesoporous material NH2-SBA-15 is obtained; and carrying out salicylaldehyde functionalization treatment on the amino functionalized mesoporous material NH2-SBA-15, so as to obtain the salicylaldehyde functionalized mesoporous material S-SBA-15. The functionalized mesoporous material NH2-SBA-15 and the functionalized mesoporous material S-SBA-15 can be used for photoelectrocatalytic reduction of CO2, and have good photoelectrocatalytic activity and stability.

The present application relates to the field of molecular sieve preparation, discloses a kind of molecular sieve matrix pellet strength improver and its preparation method and application and the preparation method of molecular sieve matrix pellet, the preparation method of molecular sieve matrix pellet strength improver includes: 1) clay mineral aggregate is mixed with sodium source, and clay base material is obtained;2) after being pulverized treatment, clay base material is calcined with hole expansion aid;Wherein, the clay mineral aggregate is the mixture of halloysite, kaolinite and montmorillonite, the water content of the clay mineral aggregate is 20-40wt%, the Fe2O3 content in the clay mineral aggregate is 0.01-0.1wt%, in the mixture of the clay mineral aggregate and the hole expansion aid, the particle size of 300-600 mesh accounts for more than 98%, and the sodium source is Na2O.The strength improver prepared by the method has high viscosity and hygroscopicity, and good plasticity.

The invention provides a molecular sieve crystallization kettle stirring device which comprises a first stirring shaft, a first stirring driver, a stirring paddle, an anchor paddle and a second stirring driver, and the first stirring shaft is rotatably arranged in a kettle body of a crystallization kettle; the first stirring driver is arranged outside the kettle body and is in dynamic coupling connection with the first stirring shaft; the plurality of stirring paddles are arranged on the first stirring shaft at intervals up and down, the stirring paddle on the uppermost side is the first stirring paddle, and blades of the first stirring paddle are wider than those of the other stirring paddles; the anchor paddle can be rotatably arranged in the kettle body along an up-and-down upward axis, and is provided with a scraping plate which is propped against the inner kettle wall of the kettle body; the second stirring driver is arranged outside the kettle body and is in dynamic coupling connection with the anchor paddle. The stirring device of the molecular sieve crystallization kettle not only ensures the gas dispersion, solid suspension, mass transfer and heat transfer effects of the crystallization kettle in a high-temperature and high-pressure environment, but also realizes a good cleaning effect in the kettle.

Provided are a titanium silicate molecular sieve, a nano-gold-loaded titanium silicate molecular sieve catalyst, and a preparation method for and the use of the catalyst. The titanium silicate molecular sieve has a micropore specific surface area of 320-500 m2 / g, a micropore volume of 0.1-0.4 cm3 / g, a mesopore specific surface area of 50-100 m2 / g, a mesopore volume of 0.075-0.1 cm3 / g, and a particle size of 100-250 nm, wherein the micropore specific surface area accounts for 50-90% of the total specific surface area. The catalyst comprises a titanium silicate molecular sieve carrier and loaded nano-gold, and the catalyst has a micropore volume of 0.06-0.4 cm3 / g, a micropore specific surface area of 160-450 m2 / g, a mesopore volume of 0.05-0.08 cm3 / g, a mesopore specific surface area of 40-85 m2 / g, and a particle size of 100-250 nm. The preparation method for the catalyst comprises the steps of subjecting a titanium silicate molecular sieve to an alkaline treatment with an aqueous aliphatic amine solution and then loading same with nano-gold particles. The catalyst is used for an olefin epoxidation reaction, a cycloolefin epoxidation reaction, a phenol hydroxylation reaction, and a cyclohexanone ammoximation reaction. By loading nano-gold particles onto a titanium silicate molecular sieve with specific physical property parameters, the high dispersity of nano-gold is achieved; and when the resulting catalyst is used for the gas-phase epoxidation reaction of propylene, a high catalytic activity is obtained, the conversion rate of propylene is increased to 8%-14%, and the selectivity of epoxypropane is increased to 90-99%.

The invention discloses a method for preparing a titanium silicalite molecular sieve catalyst by supergravity and application thereof, and the method comprises the following steps: 1) mixing a titanium source and a silicon source to obtain a solution A; 2) mixing an organic template agent with water to obtain a solution B; (3) simultaneously pumping the solution A and the solution B into an external circulation supergravity reactor, and carrying out premixing and hydrolysis reaction on the solution A and the solution B at the lower end of the external circulation supergravity reactor; 4) pumping the premixed mixed gel into a crystallization tank, and continuing nucleation and crystallization under a high-temperature condition; and 5) filtering, washing, drying and calcining a product synthesized by reaction in the crystallization tank to obtain the titanium silicalite molecular sieve catalyst. The particle size of the titanium silicalite molecular sieve catalyst prepared by the method is 20-500nm, and the specific surface area is 300-550m < 2 > / g; the titanium silicalite molecular sieve prepared by the method provided by the invention has obviously improved catalytic activity and selectivity in ketone ammoximation reaction.

A method of preparing a mesoporous Y zeolite catalyst having a larger mesoporous size is provided. The method uses a swelling agent, and optionally a co-solvent. And the mass transfer accessibility of large-volume reactants is improved by virtue of relatively large mesopores. In this preparation, a swelling agent is used in combination with cetyltrimethylammonium bromide (CTAB). A co-solvent can also be used to influence the strong swelling effect.

The present invention relates to the field of catalytic material synthesis, and discloses a large-grain beta molecular sieve and a preparation method thereof. The large-grain beta molecular sieve adopts a composite silicon-aluminum source with a specific structure, especially acid-treated and calcined silicon-aluminum gel, in which silicon atoms exist in a Q4 coordination form and aluminum atoms exist in a four-coordinate aluminum form. The above-mentioned silicon-aluminum source, an inorganic base, a template agent, and water are used as raw materials, and crystallization is performed to obtain a large-grain beta molecular sieve. The preparation method does not require the addition of a fluorine-containing mineralizer, does not additionally add other organic substances except the template agent, and the raw material preparation process is simple and fast. The beta molecular sieve synthesized by the present invention has high crystallinity, an adjustable silicon-aluminum ratio, a regular morphology, a uniform grain size, and a grain size preferably of 700-900nm.

The present application relates to the technical field of molecular sieve, and discloses a method for preparing a silicon-modified titanium-silicon molecular sieve, the modified titanium-silicon molecular sieve and application thereof, the method comprising the following steps: (1) subjecting a mixed solution containing a silicon source, a titanium source, an alkali source, water and a first organosilicon to hydrothermal crystallization; then performing solid-liquid separation, first drying and calcination; (2) contacting the calcination product obtained in step (1) with a second organosilicon, and then performing second drying; wherein the first organosilicon and the second organosilicon are each independently selected from at least one of the organosilicons shown in formula (1); in formula (1), R1, R2, R3 and R4 are each independently selected from H, an alkyl group, an alkoxy group, an aminoalkyl group, an alkylamine group and halogen. The method of the present application can obtain a titanium-silicon molecular sieve with a relatively high oxygen hole content.

The application relates to the technical field of molecular sieves, and discloses a titanium-silicon molecular sieve, a supported catalyst and application, the titanium-silicon molecular sieve has a silicon-titanium molar ratio of 100:0.05-15; and the content of oxygen vacancies in the titanium-silicon molecular sieve is 0.35-2.2 mmol / g. The catalyst prepared by using the titanium-silicon molecular sieve with the specific oxygen vacancy content as a carrier has high thermal stability, and when the catalyst is used for catalyzing propylene gas phase method to prepare propylene oxide, the conversion rate of propylene, the selectivity of propylene oxide and the service life of the catalyst can be improved.

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.

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 carbon molecular sieve according to the present invention has a half-value width of a main peak in an oxygen adsorption rate constant distribution of 0.35 sec-1 or less, and a specific surface area of 300-600 m2 / g (inclusive) as determined by the BET method from a CO2 adsorption isotherm at 25 DEG C.

The metal organic framework (MOF) MIL-100 (Al) can be produced in a process in which aluminum nitrate and trimesic acid are brought to react with one another in an alcohol / water mixture under the action of NH3 and / or an NH3-releasing compound under mild conditions.

The utility model discloses coal ash molecular sieve acidification equipment which comprises a separation cylinder and a separation mechanism arranged in the separation cylinder, the separating mechanism comprises a transmission block, a clamping block arranged in the transmission block, a motor arranged at the bottom of the separating cylinder, a transmission plate arranged at the top of the clamping block, a filtering frame arranged at the top of the transmission plate and a cleaning assembly arranged at the top of the separating cylinder; the top of the motor is fixedly connected with the bottom of the separation barrel, the transmission block is rotationally connected to the inner wall of the bottom of the separation barrel, one end of an output shaft of the motor penetrates through the separation barrel and is fixedly connected with the bottom of the transmission block, a clamping groove is formed in the upper surface of the transmission block, and the clamping block is clamped in the clamping groove; through the separation mechanism driven by the motor, automatic filtration and separation of molecular sieve products are realized, and the motor drives the transmission block to rotate so as to drive the filter frame to rotate, so that the solid and liquid separation efficiency is effectively improved, the complexity of manual operation is reduced, and the labor intensity is reduced.

The invention relates to a method for preparing a metal-organic network (MOF) comprising a step of synthesizing the metal-organic network (MOF) comprising contacting at least one aluminum alkoxide with at least one bidentate organic ligand in the presence of an aqueous solvent, thereby obtaining a colloidal suspension comprising said MOF as well as an alcohol and a step of recovering the synthesized MOF.

The present invention relates to a method for modifying a carbon molecular sieve. The method for modifying a carbon molecular sieve according to an embodiment of the present invention can introduce an effective inorganic thin film into the pores of the carbon molecular sieve, and can form a uniform thin film at a lower temperature than the existing CVD process. The method can also adjust the change in adsorption amount depending on the type of gas by finely controlling the pore size of the carbon molecular sieve, thereby increasing separation selectivity depending on the type of gas, minimizing the trade-off of a significant decrease in specific surface area, and maximizing the gas adsorption capacity even if the pore size of the carbon molecular sieve is reduced.