47results about "Aluminosilicate zeolite type-A" patented technology

The application relates to the technical field of explosion suppression agent preparation, in particular to a novel inorganic low-silicon-aluminum-ratio explosion suppression material and a preparation method thereof.The steps of the preparation method comprise the following steps: placing dried molecular sieves in an alkali solution, placing the molecular sieves in a magnetic stirrer and stirring intensively, centrifugally separating the stirred sample, washing the sample with deionized water until neutral, drying the sample in a blast drying oven at 120 DEG C for 24 h, grinding the sample in a mortar for 10 min, and sieving to obtain explosion suppression powder.The prepared inorganic low-silicon-aluminum-ratio explosion suppression material has the advantages of high efficiency, low cost, non-toxicity and harmlessness, and can be used for industrial production and applied to the field of methane explosion suppression.

A utilization method of FAU molecular sieve crystallization mother liquor, characterized in that, comprising: uniformly mixing FAU molecular sieve mother liquor, silicon source, inorganic alkali, water and aluminum source to obtain a type molecular sieve synthesis system mixture with a molar ratio of SiO2 / Al2O3=1.85-1.99, Na2O / SiO2=1.0-1.6, H2O / SiO2=45-65; aging and hydrothermal crystallization are performed on the mixture, and the product is recovered to obtain a type molecular sieve and a type molecular sieve filtration mother liquor; or further uniformly mixing the type molecular sieve filtration mother liquor and an aluminum-containing compound, stirring at 160-200 DEG C for 2-8 hours to obtain a recycled aluminum source with a SiO2 content of 50-300 ppm; uniformly mixing silicon source, inorganic alkali, recycled aluminum source and water to obtain a FAU molecular sieve synthesis system mixture, aging and hydrothermal crystallization are performed on the mixture, and the product is recovered to obtain a FAU molecular sieve and a FAU molecular sieve crystallization mother liquor. The method can not only completely recycle the FAU molecular sieve mother liquor, avoid waste water discharge, reduce the consumption of inorganic alkali and deionized water, and significantly reduce the production cost, but also can be flexibly used for preparing FAU molecular sieve and / or a type molecular sieve.

The present invention relates to a method for the preparation of monoliths of zeolite A, allowing the 3D printing of zeolite precursor gels, the product crystallization taking place contemporary to the component solidification, and to form monolithic objects with optimized designs in terms of the properties required for each application.

A high-purity artificial zeolite is industrially mass produced by carrying out osmosis treatment of fly ash in an alkaline aqueous solution, subsequently carrying out the osmosis treatment again with an acidic aqueous solution of pH 1.0 or less obtained by adding acid to the osmotic aqueous solution of fly ash, then performing solid-liquid separation while water wash and dewatering in a centrifuge, thereby synthesizing a starting composition, and performing hydrothermal reaction treatment to this starting composition.

The invention discloses a C3H8-SCR (selective catalytic reduction) catalyst as well as a preparation method and application thereof. The C3H8-SCR catalyst is a Cu-LTA silicon aluminum molecular sieve. The preparation method of the C3H8-SCR catalyst comprises the following steps: adding an acidity regulator into a copper salt solution until the copper salt solution is weak acid, then immersing an LTA silicon-aluminum molecular sieve, drying, and roasting under inert shielding gas to obtain the C3H8-SCR catalyst. The C3H8-SCR catalyst provided by the invention can be used for inhibiting propane from being directly oxidized by oxygen in a catalytic denitration reaction, reducing by-products, widening a temperature window of the denitration reaction, and ensuring higher denitration conversion rate and selectivity when the reaction is carried out at a wider reaction temperature.

This invention discloses a kinetically controlled method for preparing hierarchical porous molecular sieves, belonging to the field of catalyst preparation technology. It employs a two-step crystallization method: first, nucleation occurs at low and ultra-low H2O / SiO2 molar ratios; then, after the low-temperature phase, water is added, followed by rapid growth at high temperature and high H2O / SiO2 molar ratios. The solid-phase and liquid-phase crystallization mechanisms in the synthesis system work in succession to prepare hierarchical molecular sieves. This invention, without adding any mesoporous pore-forming agents, only modulates the crystallization temperature and the H2O / SiO2 molar ratio of the synthesis system to kinetically control the crystallization mechanism, resulting in molecular sieves with higher catalytic performance than those obtained using traditional methods. Furthermore, it overcomes the drawbacks of traditional hierarchical porous molecular sieve preparation processes, such as high cost, high calcination energy consumption, poor mesopore connectivity, and severe contamination from pore-forming agents.

This invention provides a method for preparing a sound-absorbing composite material, comprising: Step 1: cleaning a support layer to remove surface contaminants; Step 2: forming a molecular sieve seed layer or a molecular sieve transition layer on the surface of the cleaned support layer, or sequentially forming a molecular sieve seed layer and a molecular sieve transition layer; Step 3: placing the product obtained in Step 2 in the growth solution of a third molecular sieve, followed by crystallization, drying, and calcination (with or without calcination) to form a molecular sieve outer layer. Compared with the prior art, the method for preparing the sound-absorbing composite material provided by this invention does not add a binder, but instead directly deposits a film on the inner wall of the rear cavity material of the loudspeaker, i.e., the support layer, through in-situ molding. The bond between the molecular sieve outer layer and the support layer is stronger, and the performance of the molecular sieve can be more fully and effectively utilized.

The invention provides an NH3-SCR catalyst and a preparation method and application thereof, the NH3-SCR catalyst comprises an LTA molecular sieve and active components loaded on the LTA molecular sieve, and the active components comprise Cu and rare earth metal elements. According to the invention, the LTA molecular sieve and the double active components composed of Cu and rare earth metal elements have a synergistic effect, so that the catalyst shows efficient NH3-SCR catalytic activity and excellent high-temperature hydrothermal stability, and when the catalyst is applied to an NH3-SCR reaction, 90% of NOx conversion rate can be maintained at 230-550 DEG C, and 90% of N2 selectivity can be maintained at the same time. The catalyst is used in the field of diesel vehicle tail gas denitration, can realize high-efficiency treatment of tail gas NOx, and accords with corresponding emission standard limits.

The present invention relates to the use of a C3-C6 alkene compound containing only one double bond in combination with at least one molecular sieve to limit or prevent the isomerization of trans-1-chloro-3,3,3-trifluoropropene to cis-1-chloro-3,3,3-trifluoropropene and / or to limit or prevent the decomposition of trans-1-chloro-3,3,3-trifluoropropene. The present invention also relates to methods for heating or cooling fluids or objects, methods for generating electricity, and heat transfer equipment. [Selection diagram] None

This invention discloses a tetrachloroaluminate-modified type A molecular sieve, its preparation method, and its application. The invention uses fly ash cenospheres as the main raw material to prepare a type A molecular sieve. Through modification with a mixture of fly ash and tetrachloroaluminate, it exhibits excellent adsorption performance for cobalt, cesium, and strontium ions. The type A molecular sieve prepared in this application has a good synergistic effect with tetrachloroaluminate, effectively solving the problems of complex processes, high costs, and poor adhesion of existing molecular sieve adsorbent preparation methods in the market. 137 Cs, 60 Co, 90 This method addresses the problem of low adsorption rates of major hazardous nuclides in radioactive wastewater such as Sr, and can be used to adsorb radionuclides in nuclear wastewater.

The invention provides a method for recovering nepheline in lithium feldspar tailings and a molecular sieve preparation method and equipment, and relates to the field of tailings recovery. The method for recovering nepheline in the lithium feldspar tailings comprises the following steps: S11, grinding, screening and calcining the lithium feldspar tailings in sequence; and S12, slurrying the calcined material, dispersing the material through an ultrasonic separation system, then adding a flocculating agent, adding the mixed slurry into a flexible recovery system, adding a flotation reagent, agglomerating a hydrophilic material, and settling and separating a hydrophobic material. According to the method for recycling the nepheline in the lithium feldspar tailings and the molecular sieve preparation method, the nepheline in the lithium feldspar tailings is recycled through a soft natural stripping process, the extraction rate of the nepheline is increased, then the nepheline is further purified and treated, the nepheline forms molecular sieve crystal mush, and molecular sieve particles are obtained through the following steps of roasting and curing and the like. Therefore, full utilization of the lithium tailings is realized, and waste utilization is realized.

The invention relates to the technical field of molecular sieve material preparation, and discloses a synthesis method for preparing a NaX / A eutectic molecular sieve by utilizing crystallization mother liquor circulation, which comprises the following steps: step 1, uniformly mixing lithium slag and 48% sodium hydroxide solution, calcining at 330-450 DEG C, and naturally cooling to room temperature to obtain activated alkali molten slag; step 2, mixing the activated alkali molten slag with pure water according to a mass ratio of 1: 5-1: 10, putting the mixture into a hydrothermal reaction kettle, carrying out hydrothermal crystallization reaction at 90-120 DEG C, finally filtering to obtain crystallization mother liquor, washing and drying to obtain a NaX / A eutectic molecular sieve; and step 3, adding CaO or Ca (OH) 2 into the crystallization mother liquor separated in the step 2, reacting in a water bath at a certain temperature, concentrating after removing impurities, and returning to the step 1 for recycling. The synthesis method disclosed by the invention is simple in process, mild in condition, low in raw material cost and zero in emission, and meets the requirement of green production.

The application discloses a phosphogypsum reverse flotation tailing-based lanthanum modified zeolite material and a preparation method and application thereof. The preparation method of the phosphogypsum reverse flotation tailing-based lanthanum modified zeolite material comprises the following steps: uniformly mixing phosphogypsum reverse flotation tailings and NaOH particles according to a mass ratio of 1:1.0-1.4, performing alkali fusion activation treatment under the condition of 550-650 DEG C, and obtaining alkali fusion clinker; performing ball milling and sieving on the alkali fusion clinker after cooling in air, obtaining clinker powder, mixing the clinker powder and water according to a solid-liquid ratio of 5-10 mL / g, adding LaCl3 solution and uniformly mixing, performing hydrothermal crystallization treatment under the condition of 90-120 DEG C, and obtaining a crystallization product; filtering the crystallization product, washing until the pH of a washing-out liquid is 7-8, and drying. The application utilizes the phosphogypsum reverse flotation tailings as raw materials, realizes the resource utilization of industrial waste, and reduces the stockpiling of the tailings and the potential pollution to the environment.

The present invention provides: a negative thermal expansion material which is reduced in cost and density; and a composite material. A negative thermal expansion material according to one embodiment of the present invention has a negative thermal expansion coefficient, while containing at least one substance which is selected from the group consisting of MER type zeolite, GIS type zeolite, LTA type zeolite and FAU type zeolite. A composite material according to one embodiment of the present invention contains the above-described negative thermal expansion material and a material which has a positive thermal expansion coefficient.

The present application relates to a molecular sieve composition, a preparation method thereof and application thereof. The molecular sieve composition of the present application comprises a mosaic molecular sieve of a TON structure molecular sieve and a 5A type molecular sieve. The molecular sieve composition of the present application has a dual function of adsorption and hydroisomerization.

The application discloses a modified 5A molecular sieve, and a preparation method thereof. The modified 5A molecular sieve is characterized in that the modified 5A molecular sieve is composed of 5A molecular sieve and a silicon-containing compound, wherein the mass ratio of the 5A molecular sieve to the silicon-containing compound is 1:0.005-0.25, and the average crystal grain size of the modified 5A molecular sieve is not more than 1 mu m. The preparation method of the modified 5A molecular sieve comprises the preparation of 5A molecular sieve and silanization treatment.

The invention provides a method of producing zeolite from an acid-refractory mineral composition, the method comprising: (a) treating an acid-refractory mineral composition comprising aluminosilicate with an alkaline solution to dissolve silicon from the aluminosilicate into the alkaline solution, thereby producing an alkaline silicate solution and an aluminium-bearing mineral residue; (b) separating the alkaline silicate solution from the aluminium-bearing mineral residue; (c) contacting the aluminium-bearing mineral residue with an acid solution to dissolve aluminium from the aluminium-bearing mineral residue into the acid solution, thereby producing an aluminium salt solution and an aluminium-lean solid residue; (d) separating the aluminium salt solution from the aluminium-lean solid residue; (e) combining at least a portion of the alkaline silicate solution and at least a portion of the aluminium salt solution to form a zeolite precursor solution; and (f) precipitating a zeolite from the zeolite precursor solution.

The application discloses modified A-type molecular sieves, a preparation method and application thereof. The A-type molecular sieves are prepared by taking fly ash floating beads as a main raw material, alkali active sites are generated by ion exchange between the A-type molecular sieves and ammonium fluoride, the alkali active sites on the surface of the molecular sieves are reacted with ammonia water, a coordination reaction between lone pair electrons and heavy metal ions is generated, and the purpose of adsorption is achieved.

The invention provides a preparation method and application of a natural mineral-based molecular sieve optimized based on a response surface method.The molecular sieve is prepared from natural minerals as a base material through acid treatment, alkali fusion and hydrothermal synthesis, high crystallinity and high adsorption capacity serve as targets, the particle size of mineral powder is systematically optimized through a response surface method, and the particle size of the mineral powder is reduced. The molecular sieve is prepared according to key parameters such as pH, mass ratio, temperature and time of acid treatment, mass ratio, temperature, time and silica-alumina ratio of alkali melting, and hydrothermal synthesis temperature and time; the prepared molecular sieve can be applied to treatment of industrial wastewater and can be regenerated and recycled after being used. The cost is low, crystallization can be realized at low temperature, and operation is simple and safe. The molecular sieve prepared by the method has the advantages of high crystallinity, high specific surface area and high adsorption capacity, and can be used for wastewater treatment in the industries of coal chemical industry, petrochemical industry, smelting, breeding and the like.

The application discloses a method for synthesizing zirconium modified A type molecular sieve by using fly ash as raw material, and belongs to the technical field of resource comprehensive utilization. The preparation steps comprise one-pot synthesis of zirconium metal molecular sieve through raw material mixing, alkali fusion activation, direct addition of zirconium solution, stirring and aging, crystallization, suction filtration and washing and drying. The method does not need to introduce zirconium through post-processing mode, and reduces the generation of waste liquid in the ion exchange or isomorphous substitution process. Meanwhile, since no template agent is used in the preparation process, the molecular sieve does not need to be calcined to remove the template agent, the zirconium content of the synthesized molecular sieve is as high as 10.83wt%, the adsorbent has high adsorption capacity for As(V) in a solution, the maximum adsorption capacity can reach 104.63mg / g, and the adsorbent can be recycled for multiple times. The synthesis method is simple, effectively reduces the generation of pollutants and energy consumption in the synthesis process, the zirconium content of the synthesized molecular sieve is high, and the molecular sieve has high adsorption capacity for As(V).

This invention relates to the technical field of molecular sieves, and discloses a method for preparing and applying a fly ash-based low-silicon-aluminum ratio dicrystalline molecular sieve. The method includes the following steps: (1) mixing fly ash with a silicon-aluminum ratio of 2.5 to 3.5 with sodium carbonate, calcining and grinding to obtain powder; (2) adding the powder to a sodium hydroxide solution, wherein the molar ratio of sodium oxide to silicon oxide in the solution is 2.5:1 to 1.125, aging to obtain a mixed solution; (3) crystallizing the mixed solution, and then filtering and drying to obtain a low-silicon-aluminum ratio dicrystalline molecular sieve containing type A and type X. This invention uses fly ash as raw material, without adding silicon and aluminum sources, and directly performs aging and hydrothermal crystallization to synthesize low-silicon-aluminum ratio NaA and NaX dicrystalline molecular sieves. The synthesis method is simple, easy to scale up, and has low cost, and can be used for the efficient removal of low-concentration heavy metals from wastewater.

The preparation method of the large-particle-size 4A molecular sieve powder comprises the following steps: mixing reactants of an aluminum source and a silicon source for a synthetic reaction to obtain crystallized slurry; the crystallization slurry is subjected to at least two times of segmented heating treatment, the temperature of the previous heating treatment is lower than that of the next heating treatment, and heat preservation treatment is conducted on the crystallization slurry after each time of heating treatment; and carrying out solid-liquid separation and calcination on the crystallized slurry subjected to segmented heating treatment to obtain 4A molecular sieve powder with the particle size D50 not less than 4 microns. According to the method, the problem that the grain size is difficult to control in a traditional method is solved by accurately controlling the temperature and time in the synthesis process, and an effective technical means is provided for industrial production of the 4A molecular sieve powder.

The preparation method comprises the following steps: S1, weighing a silicon source and a metal source, dissolving the silicon source and the metal source in a solvent, fully and uniformly mixing to form a solution, adding an organic structure-directing agent according to a molar ratio of the organic structure-directing agent to the silicon source (based on SiO2) of (1-3): 1 to obtain a uniform mixed solution, and uniformly mixing the uniform mixed solution with the silicon source (based on SiO2); then drying and volatilizing to form xerogel; and S2, placing the xerogel obtained in the S1 in a water vapor condition, carrying out a dissolution-assembly-crystallization reaction under the auxiliary action of water vapor, centrifuging and washing the obtained product, and carrying out high-temperature roasting to remove the organic structure-directing agent so as to obtain the zeolite with graded pore channels. Compared with the prior art, the prepared zeolite with the graded pore channels has the mesopore diameter of 2-50 nm, has assembling stacking mesopores and internal etching mesopores at the same time, has the micropore diameter of 0.3-1.3 nm and the specific surface area of 200-1200 m < 2 > / g, and has wide application prospects in the fields of thermocatalysis, adsorption and the like.

The application discloses a method for synthesizing NaA molecular sieve membrane by using wet gel layer crystallization. The method comprises the following steps: firstly, preparing a wet seed carrier, then, without drying treatment, the wet seed carrier is directly soaked in a gel solution to form a wet gel layer on the surface of the wet seed carrier, and after being taken out, the wet seed carrier is put into a reaction kettle to be heated and crystallized to synthesize high-performance NaA molecular sieve membrane. The preparation process is simple, the utilization rate of the gel solution is high, the preparation reproducibility is good, the prepared NaA molecular sieve membrane has high separation performance, can be applied to large-scale application, and has important industrial application value.

The present invention relates to a composition comprising zeolite crystals and a hydroxylated oil stabilized by an organophilic phyllosilicate dispersant. The present invention also relates to the use of said composition for drying organic compounds, compositions or solutions.

The invention relates to a bacteriostatic and dehumidifying molecular sieve membrane material as well as a preparation method and application thereof. The bacteriostatic and dehumidifying molecular sieve membrane material comprises a carrier layer, a bacteriostatic layer and a molecular sieve moisture absorption layer, the antibacterial layer is made of hydrotalcite; the molecular sieve moisture absorption layer is made of at least one of a NaA molecular sieve, a 13X molecular sieve or an SAPO-34 molecular sieve. The hydrotalcite LDH is introduced between the carrier and the molecular sieve to serve as an antibacterial layer, so that bacterial breeding and pollution of the membrane material are effectively prevented, on the other hand, the hydrotalcite LDH can serve as a buffer layer to play an auxiliary supporting role, Al atoms contained in hydrotalcite and oxygen atoms or silicon atoms in a molecular sieve framework can form stable chemical bonds (such as Al-O-Si), and the molecular sieve has a good antibacterial effect. The interface coupling effect obviously enhances the adhesive force of the molecular sieve layer on the metal / ceramic substrate; and the rough surface of the hydrotalcite with the laminated structure is more beneficial to the attachment of the NaA molecular sieve, so that the service life of the membrane material is prolonged.

To provide a zeolite separation material and a method for stably separating an ethylene amine from water in an aqueous solution, which contains the ethylene amines of 10-90 wt.%.SOLUTION: A zeolite separation material is used to separate an ethylene amine from water in an aqueous solution, which contains the ethylene amines of 10-90 wt.%. The zeolite separation material contains a zeolite with the molar ratio SiO2 / Al2O3 of 2-40 and a total metal ion exchange rate of 90% or more.SELECTED DRAWING: None

This invention provides a hydrogen storage molecular sieve, the preparation method of which includes the following steps: weighing solid sodium hydroxide, potassium hydroxide, potassium silicate, and water and dissolving them in water to obtain a mixed solution; adding aluminum hydroxide to the mixed solution, stirring, and heating to begin crystallization; simultaneously with the start of crystallization, slowly adding aluminum hydroxide and amorphous silica to the mixed solution, maintaining a constant temperature for crystallization; filtering and drying the crystallized product to obtain a nano-3A molecular sieve product; placing the 3A molecular sieve in a dodecyltrimethoxysilane solution, heating and immersing at a constant temperature, washing with anhydrous ethanol, and drying. This invention introduces long-chain alkyl groups into the 3A molecular sieve framework, effectively improving the hydrophobicity of the molecular sieve surface, enhancing the hydrogen adsorption capacity, achieving a water contact angle of 133°, and a hydrogen adsorption rate of up to 8.1 wt%.

The invention discloses a method for preparing a low-grade high-iron fly ash-based hierarchical pore A type molecular sieve without a template agent and application of the molecular sieve in adsorption of low-concentration carbon dioxide, and belongs to the field of molecular sieves. The method for preparing the low-grade high-iron fly ash-based hierarchical pore A-type molecular sieve without the template agent comprises the following steps: carrying out calcination, acid pickling and alkali fusion activation on low-grade high-iron fly ash to obtain pretreated fly ash, and then carrying out a crystallization reaction to complete the preparation of the low-grade high-iron fly ash-based hierarchical pore A-type molecular sieve. Through unique pretreatment and synthesis processes, impurity iron in the high-iron fly ash is partially converted into a beneficial component, a hierarchical pore structure is synchronously constructed, and finally, the molecular sieve adsorbent with excellent adsorption performance on low-concentration CO2 is prepared. According to the method, controllable transformation of iron species from an oxide form in a raw material to a framework doping form (Fe-O-Si) in a final product is realized, so that the negative influence of iron on a crystallization process is avoided, and the iron becomes an active site for improving the adsorption performance.