42 results about "TETRAETHYLAMMONIUM HYDROXIDE" patented technology

The invention discloses a corrosion-resistant polysilsesquioxane modified polyurethane emulsion and a preparation method thereof, and belongs to the technical field of emulsions.The preparation method comprises the steps that gamma-aminopropyltriethoxysilane, namely APTES, is subjected to hydrolytic condensation under the catalysis of tetraethylammonium hydroxide, and POSS is prepared; the preparation method comprises the following steps: carrying out hydrolytic condensation reaction on APTES, synchronously adding phenyltrimethoxysilane in the hydrolytic condensation reaction, forming phenyl-amino difunctional POSS (Polyhedral Oligomeric Silsesquioxane) according to a molar ratio of phenyltrimethoxysilane to APTES of 1: 4, and grafting POSS and graphene oxide GO in dimethyl sulfoxide through amidation reaction to prepare a POSS / GO composite material; dispersing POSS / GO / Zn in the polyurethane prepolymer, adding a curing agent and a solvent, and stirring to form a homogeneous emulsion; through phenyl trapezoid polysilsesquioxane modification and dynamic reversible self-repairing network design, the wear resistance of the coating is improved, microcracks can be closed at the temperature of 60 DEG C, and the maintenance requirement is reduced; laser micro-nano structured base material treatment is combined, the adhesive force is increased to be larger than or equal to 20 MPa, and meanwhile a gamma-butyrolactone low-VOC solvent is adopted.

The invention belongs to the technical field of molecular sieve catalysts, and discloses a catalyst for preparing isobutene through acetone conversion and a preparation method and application thereof.The preparation method comprises the steps that firstly, an HBeta molecular sieve is treated with concentrated nitric acid to prepare a dealuminated Beta molecular sieve; then loading the hafnium oxychloride octahydrate in the dealuminated Beta molecular sieve by an impregnation method; putting the obtained sample into a tetraethylammonium hydroxide solution, and fully stirring; and drying, centrifuging, washing to be neutral, drying, and roasting to obtain the Hf / Beta catalyst. The catalyst shows excellent catalytic activity and selectivity in the reaction of preparing isobutene through acetone conversion, is good in stability, and can obtain high-efficiency isobutene yield; the catalyst carrier and the metal precursor salt are cheap and easy to obtain, and the preparation process is simple; therefore, a new effective way is provided for production of isobutene, and the situation that isobutene mainly depends on traditional energy at present is effectively relieved.

The invention relates to the technical field of preparation of Beta molecular sieves, and discloses a method for rapidly preparing a nano Beta molecular sieve by using a microwave synthesis method, which comprises the following steps: selecting proper silicon sources (such as silicon dioxide, white carbon black and the like) and aluminum sources (such as sodium metaaluminate, aluminum sulfate and the like), adding a template agent (such as tetraethylammonium hydroxide), an alkali source (such as sodium hydroxide) and deionized water, and carrying out microwave synthesis to obtain the nano Beta molecular sieve. Uniformly mixing and stirring according to a specific molar ratio to obtain initial gel; and crystallizing the gel, wherein a conventional hydrothermal method or a microwave heating method can be adopted. And after crystallization is completed, carrying out post-treatment such as filtration, washing, drying and high-temperature calcination on the product to finally obtain the Beta molecular sieve product. According to the method for rapidly preparing the nano Beta molecular sieve by utilizing the microwave synthesis method, provided by the invention, the synthesis steps are simplified, the crystallization time is remarkably shortened, the production efficiency is improved, the particle size of the nano Beta molecular sieve is effectively controlled, and a nano-scale product with smaller particle size and more uniform distribution is obtained.

The invention provides a method for preparing high-purity flaky alumina based on a hydrolysis method, and belongs to the field of high-purity flaky alumina powder. The method comprises the steps that metal aluminum scraps are pretreated; the method comprises the following steps: putting metal aluminum scraps, an alkaline organic matter catalyst and a morphology control agent into water, and carrying out a hydrolysis reaction at a set temperature for a set time to obtain a reaction mixed solution; carrying out solid-liquid separation, washing and drying on the reaction mixed solution to obtain flaky aluminum hydroxide; and roasting the flaky aluminum hydroxide to remove crystal water so as to obtain high-purity flaky aluminum oxide, wherein the alkaline organic matter catalyst comprises at least one of the following components: tetraethylammonium hydroxide, tetramethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide; the morphology control agent comprises at least one of ammonium bifluoride and ammonium fluoride. The preparation method disclosed by the invention is simple in process flow, free of an impurity removal process, mild in reaction condition, short in reaction time and free of environmental pollution, and the product is regular in shape and high in purity.

The invention provides an ionic liquid and a compound absorbent containing the same. The ionic liquid is tetraethylammonium hydroxide amino acid salt; the compound absorbent comprises the ionic liquid and imidazole.

The invention provides a chemical composition for removing etching residues, which comprises organic ammonium, a corrosion inhibitor, an organic solvent, an inhibitor, hydroxylamine and deionized water, the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide, and the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide; the inhibitor is selected from one or more of fructose, galactose, lactose, maltose, glucose, ascorbic acid, hydroxylamine sulfate and ethanol hydrazine. Compared with the prior art, the chemical composition for removing the etching residues can effectively remove the residues after plasma etching, meanwhile, etching of AlCu, TiN / Ti and silicon oxide is avoided, an operation window is large, and the chemical composition has good application prospects in the semiconductor etching process.

The application relates to the technical field of Beta molecular sieve preparation, and discloses a method for rapidly preparing nano Beta molecular sieve by using a microwave synthesis method, which comprises the following steps: selecting appropriate silicon sources (such as silicon dioxide, white carbon black and the like) and aluminum sources (such as sodium metaaluminate, aluminum sulfate and the like), adding a template agent (such as tetraethylammonium hydroxide), an alkali source (such as sodium hydroxide) and deionized water, uniformly mixing and stirring according to a specific molar ratio to obtain an initial gel; then crystallizing the gel, and the crystallization can be carried out by using a conventional hydrothermal method or a microwave heating method; and after the crystallization is completed, the product is subjected to post-treatment such as filtering, washing, drying and high-temperature calcination, and finally, the Beta molecular sieve product is obtained. The method for rapidly preparing nano Beta molecular sieve by using the microwave synthesis method simplifies the synthesis steps, significantly shortens the crystallization time, improves the production efficiency, effectively controls the particle size of the nano Beta molecular sieve, and obtains the nano-level product with smaller particle size and more uniform distribution.

The invention discloses a Cu-SUZ-4 molecular sieve as well as a synthesis method and application thereof. In the prior art, a Cu-SUZ-4 molecular sieve needs to be prepared by adopting seed crystal assistance and step-by-step loading of a copper source, the invention provides a method for synthesizing the Cu-SUZ-4 molecular sieve by a one-step hydrothermal in-situ method of the copper source under a seed crystal-free condition, and the method comprises the following steps: mixing a silicon source, an aluminum source, a mineralizing agent, tetraethylammonium hydroxide, the copper source and water according to a set molar ratio to form gel; and carrying out hydrothermal crystallization to synthesize the Cu-SUZ-4 molecular sieve. The invention further discloses the Cu-SUZ-4 molecular sieve and application thereof in NH3-SCR reaction, the NOx removal efficiency of the catalyst in the temperature range of 250-450 DEG C exceeds 90 vol%, and the catalyst has high catalytic activity, sulfur resistance and hydrothermal stability and is suitable for the fields of diesel vehicle tail gas denitration and industrial waste gas purification.

This invention relates to the field of catalysis, and discloses a method for preparing a naphthalene alkylation catalyst based on a hierarchical porous molecular sieve and its application. The preparation method includes: 1) treating a low silica-to-alumina ratio zeolite molecular sieve with a microporous structure by steam treatment or acid washing to obtain a dealuminized molecular sieve; 2) treating the dealuminized molecular sieve with a mixed aqueous solution of tetraethylammonium hydroxide and alkali to obtain a surface-rich silica-based hierarchical porous molecular sieve; 3) modifying the surface-rich silica-based hierarchical porous molecular sieve with ammonium ion exchange and calcining to obtain an alkylation catalyst, wherein the inner layer has a hierarchical porous structure with micropores and mesopores, and the outer layer is mainly mesoporous inert silica. The naphthalene alkylation catalyst prepared by this invention has a hierarchical porous structure with micropores and mesopores in the inner layer and an outer layer mainly mesoporous inert silica. This catalyst has the advantages of high selectivity, good mass transfer efficiency, and low deactivation.

The invention relates to a flaky self-assembly prismatic table type SAPO-5 / SAPO-34 composite molecular sieve and preparation and application thereof. A preparation method mainly comprises the following steps: (1) mixing a phosphorus source, an aluminum source, polyethylene glycol and deionized water, and heating and stirring to obtain an emulsion synthetic solution A; (2) adding a silicon source and a tetraethylammonium hydroxide solution into the emulsion synthetic solution A, and continuously heating and stirring to obtain a synthetic solution B; and (3) transferring the synthetic liquid B into a high-pressure reaction kettle, carrying out hydrothermal crystallization, and then filtering, washing, drying, roasting and cooling the obtained solid product to obtain the sheet-shaped self-assembled prismatic table type SAPO-5 / SAPO-34 composite molecular sieve. The prepared prismatic table type SAPO-5 / SAPO-34 composite molecular sieve is formed by assembling and stacking 200-500nm nanosheets, and the special morphology and composite pore structure of the prismatic table type SAPO-5 / SAPO-34 composite molecular sieve can greatly improve the diffusion rate of reactants and products and show excellent catalytic performance in the catalytic reaction process of preparing olefin from dimethyl ether.

The invention relates to the technical field of gemini surfactants, and belongs to a gemini surfactant for developing a negative photoresist. The invention further discloses a developing solution, the developing solution comprises the gemini surfactant for developing the negative photoresist, the weight part of the gemini surfactant is 2-10%, and the developing solution further comprises 5-15% by weight of an alkaline substance and the balance of water. The alkaline substance is one of potassium hydroxide, tetramethylammonium hydroxide and tetraethylammonium hydroxide, the concentration of the alkaline substance is 8%-12%, and the concentration of the surfactant is 4%-8%.

The invention belongs to the technical field of chemical catalysis, and provides a preparation method and application of a modified MCM-22 molecular sieve catalyst. Unroasted MCM-22 (P) is used as a raw material, organic alkali (such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide or tetrabutylammonium hydroxide) is adopted for modification treatment, and then ion exchange and roasting are performed to obtain the hydrogen type modified molecular sieve. Organic alkali has the synergistic effect of alkali treatment and structure guiding, and the crystal phase purity and framework integrity are maintained while controllable desilicication is achieved. The catalyst is used for alkylation removal reaction of thiophenic sulfur in styrene, the selectivity of mono-substituted alkylation products is remarkably improved, and side reaction of styrene polymerization is effectively inhibited. The preparation method is simple, the catalytic performance is excellent, and the catalyst has a good industrial application prospect.

The invention belongs to the field of catalysts, and particularly relates to a fluorinion-assisted SAPO-34 catalyst as well as a preparation method and application thereof. In the invention, pseudo-boehmite or aluminum isopropoxide is used as an aluminum source, phosphoric acid is used as a phosphorus source, white carbon black or silica sol is used as a silicon source, triethylamine or tetraethylammonium hydroxide is used as an organic template agent, and fluorine is hydrofluoric acid or ammonium fluoride. The SAPO-34 molecular sieve is synthesized by adopting a traditional hydrothermal method. The preparation method comprises the following steps: adding the raw materials into a beaker, stirring at room temperature to form uniform gel, transferring the gel into a reaction kettle, and crystallizing at 170-200 DEG C for 24-72 hours; and after the reaction is finished, centrifuging, washing and drying the solid product overnight, and calcining the dried sample in a muffle furnace at 550-600 DEG C for 6 hours to remove the template agent, thereby obtaining the molecular sieve catalyst. On the basis, the catalytic performance of the SAPO-34 catalyst in catalysis of methanol to olefin reaction is improved.

The invention belongs to the technical field of zeolite molecular sieve preparation, and particularly discloses a preparation method and application of a Ni-EMT zeolite molecular sieve.The Ni-EMT zeolite molecular sieve is prepared by using a complex of nickel nitrate hexahydrate and ethylenediamine as a nickel source and a template agent and using relatively cheap tetrabutyl ammonium hydroxide and tetraethylammonium hydroxide as synergistic template agents. According to the present invention, the Ni-EMT zeolite molecular sieve is directly prepared by using the one-pot method, the prepared Ni-EMT zeolite molecular sieve has characteristics of high crystallinity, stable molecular sieve structure, large specific surface area and large pore, and compared with the traditional method, the use of the expensive and high-toxicity 18-crown ether-6 template agent is avoided, and the metal nickel is coated in the EMT molecular sieve in situ so as to achieve the purpose of the in-situ preparation of the Ni-EMT zeolite molecular sieve. According to the present invention, the nickel loading amount of the Ni-EMT zeolite molecular sieve prepared by the method can be adjusted, such that the Ni-EMT zeolite molecular sieve can be used for the catalytic reactions such as the preparation of cyclohexylbenzene through the hydroalkylation of benzene, and can be widely used in the actual industrial application.

The invention provides a crystal form E-enriched silicon-aluminum-germanium Beta molecular sieve as well as a preparation method and application thereof, and belongs to the technical field of molecular sieve material synthesis and catalytic application thereof. A framework of the molecular sieve contains silicon, germanium and aluminum elements at the same time, a powder X-ray diffraction pattern of the molecular sieve shows strongest diffraction peaks at 2theta = 9.78 + / -0.3 degrees and 22.14 + / -0.3 degrees, and the proportion of a crystal form E is not lower than 80%. The preparation method comprises the following steps: by taking tetraethylammonium hydroxide as a template agent, optimizing the molar ratio of Ge / Si / Al, optionally adding an ITQ-1 seed crystal, and carrying out hydrothermal crystallization and roasting, thereby obtaining the catalyst. The molecular sieve disclosed by the invention has a unique single-crystal hierarchical pore structure, effectively improves mass transfer limitation, shows catalytic activity, low-carbon olefin selectivity and stability which are far higher than those of a traditional ZSM-5 molecular sieve in hydrocarbon catalytic cracking, methanol-to-olefin and furfural / furfuryl alcohol etherification reactions, and has a wide industrial application prospect.

The application provides a preparation method of SAPO-34 / SAPO-5 composite molecular sieve, the SAPO-34 / SAPO-5 composite molecular sieve and application. The preparation method of the SAPO-34 / SAPO-5 composite molecular sieve provided by the application comprises S1: subjecting a first mixture comprising a silicon source, an aluminum source, a phosphorus source, a first structure directing agent and water to a first crystallization treatment to obtain a first crystallization product; S2: mixing a second structure directing agent with the first crystallization product and then subjecting to a second crystallization treatment; wherein the first structure directing agent is selected from tetraethylammonium hydroxide and / or morpholine, and the second structure directing agent is selected from tetraethylammonium hydroxide and / or morpholine. When the SAPO-34 / SAPO-5 composite molecular sieve prepared by the application is used in a methanol-to-olefin reaction, the selectivity of C4 olefin in the methanol-to-olefin reaction can be effectively improved, and the SAPO-34 / SAPO-5 composite molecular sieve has a good industrial application prospect.

The present disclosure relates to a kind of UZM-8 molecular sieve and its preparation method, catalyst and application containing UZM-8 molecular sieve, the method includes: the raw material mixture containing silicon aluminum source, first template agent, second template agent and water is carried out hydrothermal crystallization reaction and recovers product;Wherein, the first template agent is at least one selected from tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide, the second template agent is dimethyl diethyl ammonium hydroxide.Compared with the UZM-8 molecular sieve synthesized by traditional hydrothermal method, the UZM-8 molecular sieve with high crystallinity, high specific surface area and pore volume can be synthesized in the present disclosure, while the synthesis cost of molecular sieve is significantly reduced.

The invention relates to the technical field of printed circuit board (PCB) manufacturing, in particular to an ultrathin anti-corrosion film based on electrophoretic deposition and a positive photosensitive mechanism and application of the ultrathin anti-corrosion film. According to the ultrathin anti-corrosion film, an electrophoretic liquid is prepared from branched carboxyl modified epoxy acrylate, methacrylic acid-2-azido ethyl ester, a benzotriazole-zinc complex, a perfluoropolyether surfactant, tetraethylammonium hydroxide, deionized water and ethylene glycol butyl ether, and then a film layer is formed through electrophoretic deposition. According to the anti-corrosion film, the uniformity and the hole wall coverage rate are improved through a branched structure, high-precision development is achieved by means of the photosensitive characteristic of methacrylic acid-2-azido ethyl ester, the etching resistance is enhanced through a benzotriazole-zinc complex, and pattern transfer is completed through the steps of exposure, development, curing, etching and the like. The method is suitable for high-precision scenes such as an IC carrier plate and a Mini LED display panel, can meet the line width / spacing requirement of 3 microns or below, and improves the signal transmission stability and process compatibility of a product.

The application relates to the technical field of starch modification, and discloses a preparation method of hydroxypropyl modified starch, which comprises the following steps: obtaining acidified starch milk by acidifying treatment of starch, adjusting the pH of the acidified starch milk to 9-11 to obtain starch milk; uniformly mixing the starch milk, a catalyst and a propylene oxide solution, stirring the mixture at 35-45 DEG C to obtain a reactant; and obtaining the hydroxypropyl modified starch by alcohol precipitation, washing, filtration and drying of the reactant; wherein the catalyst comprises tetraethylammonium hydroxide, sodium carbonate and tetrabutylammonium bromide. The above technical scheme solves the problem of low substitution degree of the hydroxypropyl modified starch in the related art.

The invention relates to a fluorene-based polymer fluorescent probe and a preparation method and application thereof, the preparation method comprises the following steps: 1, dissolving diborate fluorene, dibromo fluorene, dibromo heteroaromatic ring and dibromo benzothiadiazole monomers in an organic solvent, and adding a catalyst and a tetraethylammonium hydroxide aqueous solution for reaction; and 2, after the reaction is finished, cooling to room temperature, precipitating in methanol, filtering, performing Soxhlet extraction, and drying to obtain the fluorene-based polymer fluorescent probe. The application method comprises the following steps: 1, dissolving the fluorene-based polymer fluorescent probe in toluene to prepare a toluene solution, adding the toluene solution into N, N-dimethylacetamide, and filtering to obtain a fluorescent probe solution; and 2, taking the fluorescent probe solution, adding the to-be-detected water sample in batches, carrying out fluorescence emission spectrum determination under excitation of a light source with the excitation wavelength of 340-390nm, drawing a fluorescence intensity change curve, and calculating the fluorescence emission spectrum intensity change value delta I before and after the to-be-detected water sample is added into the fluorescent probe solution according to the curve.

The invention discloses a preparation method and application of a low-silicon SAPO-34 molecular sieve. Comprising the following steps: mixing an aluminum source, a phosphorus source, a silicon source, a template agent R1, a template agent R2 and water to obtain initial gel, wherein the molar ratio of Al2O3 to P2O5 to SiO2 to R1 to R2 to H2O in the initial gel is 1.0: (0.5-3.0): (0.01-0.3): (0.5-8.0): (0.01-2.0): (20-200); r1 is at least one of diethylamine, triethylamine, di-n-propylamine, diisopropylamine, n-butylamine, morpholine, cyclohexylamine, piperazine and tetraethylammonium hydroxide; r2 is at least one of diethylenetriamine, triethylene tetramine, tetraethylenepentamine, pentaethylenehexamine and polyethylene polyamine; heating and crystallizing the initial gel under a closed condition to obtain a crystallized product; and separating and drying the crystallized product to obtain the molecular sieve. The method is simple in process, good in repeatability and beneficial to large-scale industrial production.

This invention relates to the field of molecular sieve technology, specifically to a SAPO-34 molecular sieve, its preparation method, and its applications. The preparation method includes: aging, pre-crystallization, and crystallization of a gel containing an aluminum source, tetraethylammonium hydroxide, a silicon source, a phosphorus source, and water; wherein the aging temperature is 40-80℃, and the aging time is 4-12 h; the pre-crystallization temperature is 90-130℃, and the pre-crystallization time is 2-24 h; and the crystallization temperature is 180-210℃, and the crystallization time is 24-50 h. The SAPO-34 molecular sieve prepared by this invention has a nanometer-sized particle size, uniform morphology, clean surface, high regularity, and the preparation operation is simple and environmentally friendly.

The invention relates to the technical field of catalysts, in particular to a preparation method and application of a cobalt-based bifunctional catalyst for synthesizing liquid hydrocarbons, and the preparation method comprises the following steps: (1) preparation of an amorphous mesoporous material: dissolving an aluminum source and a silicon source in an organic solvent, adding triethanolamine and deionized water, and uniformly mixing to obtain the amorphous mesoporous material; then adding tetraethylammonium hydroxide under a stirring condition until the mixture is gel-shaped, aging and drying, carrying out hydrothermal treatment, and then roasting to obtain an amorphous mesoporous material; (2) preparation of a cobalt-based bifunctional catalyst: cobalt nitrate hexahydrate and the amorphous mesoporous material are mixed and ground uniformly, heat treatment is performed under a sealed condition, and the content of Co is 5-15 wt%; the cobalt-based bifunctional catalyst is obtained by roasting in continuously flowing gas, and the problems that hydrogen-poor synthesis gas is difficult to effectively utilize to produce liquid hydrocarbons in the existing Fischer-Tropsch synthesis reaction, and the metal dispersity is relatively low and metal ions are leached in an impregnation method are solved.

The invention provides a POSS (Polyhedral Oligomeric Silsesquioxane) resin solution with high light transmittance, a composite coating and a preparation method thereof, and relates to the field of coating materials. The preparation method comprises the following steps: mixing methylcyclotetrasiloxane, an allyl-containing silane coupling agent, deionized water and ethanol, uniformly stirring, dropwise adding tetraethylammonium hydroxide, and carrying out hydrolysis reaction for 2-4 hours; then heating to 80-100 DEG C, carrying out condensation reaction for 8-10 hours, and carrying out rotary evaporation; washing, filtering and drying to obtain POSS (Polyhedral Oligomeric Silsesquioxane) resin powder; pOSS resin powder and acetonitrile are mixed and filtered, solids obtained after filtering are mixed with isopropanol and polyethylene glycol, standing and liquid separation are conducted, and the POSS resin solution is obtained. Mixing the AR solution, the unsaturated polyester resin and the POSS resin solution to obtain a mixed solution; and blade-coating a base material with the mixed solution, baking at 50-60 DEG C for 3-5 minutes, carrying out thermal annealing, and carrying out UV curing to obtain the composite POSS coating material. The light transmittance of the composite coating is greater than 92%, and the composite coating has good pencil hardness, scratch resistance, wear resistance, adhesive force, bending resistance, impact resistance and the like.

The invention discloses a zeolite catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The invention provides a preparation method of a zeolite catalyst. The preparation method comprises the following steps: carrying out heat treatment on aluminum-containing zeolite to remove a template agent in the aluminum-containing zeolite; the roasted zeolite is obtained. And carrying out acid treatment on the roasted zeolite to remove Al in the zeolite so as to obtain the dealuminated zeolite. The method comprises the following steps: by taking dealuminated zeolite as a silicon source and tetraethylammonium hydroxide as a template agent, adding a zinc source, and carrying out evaporation treatment to obtain a mixture; performing pre-crystallization treatment on the mixture, and adding a mineralizing agent to form gel; and carrying out crystallization treatment and roasting treatment on the gel to obtain the zeolite catalyst. When the prepared zeolite catalyst is used, thermodynamic limitation is broken through, high polylactic acid conversion rate and high methyl lactate yield are obtained at mild temperature and pressure, and the technical problems that a traditional polylactic acid methanol depolymerization catalyst is difficult to separate, poor in effect, complex to synthesize and toxic are solved.

The application discloses a kind of double-template method high crystallinity AlPO-18 molecular sieve and preparation method thereof.Step includes: phosphorus source, deionized water, aluminium source, tetraethylammonium hydroxide, tetraethylammonium chloride and seed crystal are sequentially added in hydrothermal reactor with stirring uniformity, and after aging certain time at room temperature, hydrothermal reactor is sealed, and placed in reactor high-temperature static crystallization;The hydrothermal crystallization product is washed, dried and calcined, and then high-crystallinity quadrilateral AlPO-18 molecular sieve is obtained.Compared with prior art, its significant features are simple operation, low water aluminum ratio, high crystallinity, high yield;And using double-template method, to a certain extent, reduce the amount of expensive template agent tetraethylammonium hydroxide, effectively reduce the cost, with the wide prospect of industrial production and application.

The invention discloses an MTW zeolite two-type nanocrystalline aggregate. A preparation method of the MTW zeolite two-type nanocrystalline aggregate comprises the following steps: a) taking tetraethylammonium hydroxide as a template agent of a first type; b) the second type uses methyl triethyl ammonium chloride as a template agent; the first type of reactant raw materials and the second type of reactant raw materials comprise sodium metaaluminate, sodium hydroxide, silica sol and pure water. According to the invention, a direct synthesis method is adopted, and a template agent, accurately-blended raw materials and a fine preparation process are ingeniously utilized to generate a large mesoporous structure in one step. According to the innovative method, the operation process is greatly simplified, the process difficulty is reduced, the microstructure and performance of the zeolite can be more accurately controlled, and a road is broadened for wide application of the MTW zeolite in the fields of catalysis, adsorption and the like.

The application discloses a preparation method of nanoscale Ti-Co-beta molecular sieve, which comprises the following steps: taking tetraethyl orthosilicate or silica sol as a silicon source, titanium tetrachloride or titanium isopropoxide as a titanium source, cobalt chloride hexahydrate as a cobalt source, sodium hydroxide as an alkali source, tetraethylammonium hydroxide as a template agent, and sodium acetate or sodium benzoate as a mineralizer; after one-step hydrothermal treatment, drying and calcination, Na type Ti-Co-beta molecular sieve is obtained; and after ion exchange treatment, sodium ions are removed, and nanoscale Ti-Co-beta molecular sieve is obtained. The method has the advantages of no need of adding fluoride, simple operation, good repeatability, low cost, easy industrialization, and the like, and the prepared Ti-Co-beta molecular sieve has the advantages of nanoscale, good crystallinity, uniform distribution of Ti and Co in the zeolite framework of the beta molecular sieve, large specific surface area and rich metal active sites, and the like, and is suitable for a toluene hydroxylation reaction and has very good catalytic activity, high toluene conversion rate and phenol selectivity.

The invention relates to the technical field of starch modification, and provides a preparation method of hydroxypropyl modified starch, which comprises the following steps: acidizing starch to obtain acidized starch milk, and adjusting the pH value of the acidized starch milk to 9-11 to obtain starch milk; the preparation method comprises the following steps: uniformly mixing starch milk, a catalyst and an epoxypropane solution, and stirring at 35-45 DEG C to obtain a reactant; performing alcohol precipitation, washing, filtering and drying on reactants to obtain hydroxypropyl modified starch; wherein the catalyst comprises tetraethylammonium hydroxide, sodium carbonate and tetrabutylammonium bromide. Through the technical scheme, the problem of low substitution degree of hydroxypropyl modified starch in related technologies is solved.

The invention provides a synthesis method and application of an H-shaped slice high-silicon mordenite molecular sieve, and belongs to the technical field of molecular sieve synthesis and application. The preparation method comprises the following steps: mixing tetraethylammonium hydroxide and long-chain pyrrolidinium salt as template agents with an alkali source, an aluminum source and a seed crystal to form silicon-aluminum sol, aging the silicon-aluminum sol, carrying out a crystallization synthesis reaction, and carrying out ammonium ion exchange, drying and roasting to obtain the H-type high-silicon slice mordenite molecular sieve (MOR). According to the synthesized H-shaped sheet high-silicon mordenite molecular sieve, the Al element is enriched in an eight-membered ring of an MOR zeolite molecular sieve skeleton structure, acid sites which are subjected to side reactions in HMOR can be effectively shielded, and the H-shaped sheet high-silicon mordenite molecular sieve has good catalytic activity and product selectivity when being applied to a reaction for synthesizing methyl acetate through carbonylation.