485results about "Pentasil aluminosilicate zeolite" patented technology

The invention discloses a preparation method of a nano HZSM-5 molecular sieve, and belongs to the technical field of nano molecular sieve preparation, the preparation method comprises the following steps: 1, adding a silicon source, an aluminum source and a template agent into a supercritical crystallization reaction kettle, heating, stirring, and carrying out a melting reaction on the raw materials to obtain a seed crystal mixed material; introducing absolute ethyl alcohol into the seed crystal mixed material obtained by the melting reaction, heating, stirring, and carrying out crystallization reaction to obtain a reaction product; and cooling, washing, drying and roasting the obtained reaction product to obtain the nano HZSM-5 molecular sieve. According to the present invention, the melting reaction and the supercritical ethanol crystallization reaction technology are introduced into the preparation of the nanometer HZSM-5 molecular sieve for the first time, and the prepared nanometer HZSM-5 molecular sieve has advantages of small grain size, uniform distribution, large specific surface area and high yield.

The invention discloses a preparation method of a mesoporous Zn-ZSM-5 molecular sieve for preparing aromatic hydrocarbon from methanol, and belongs to the technical field of synthesis of inorganic materials. Aiming at the problems that a conventional mesoporous Zn / ZSM-5 molecular sieve catalyst Zn blocks orifices, the mesoporous structure is disordered, the molecular sieve solid yield is low, a molecular sieve framework is seriously damaged and the like, the preparation method comprises the following steps: uniformly mixing zinc gluconate with an aluminum source, a silicon source and a template agent, putting the mixture into a closed reaction container, carrying out hydrothermal crystallization, and sequentially washing, drying and roasting to obtain the mesoporous Zn / ZSM-5 molecular sieve catalyst. The sodium type molecular sieve is obtained; the preparation method comprises the following steps: carrying out multiple ion exchange on a sodium type molecular sieve by using an ammonium chloride solution, and sequentially carrying out suction filtration, washing, drying and roasting to obtain the mesoporous Zn-ZSM-5 molecular sieve. According to the preparation method of the methanol-to-aromatic hydrocarbon Zn / ZSM-5 molecular sieve provided by the invention, the obtained molecular sieve is used in the methanol-to-aromatic hydrocarbon process, and has the characteristics of high carbon deposition resistance, high aromatic hydrocarbon selectivity, low Zn wastage rate and the like.

The invention belongs to the technical field of molecular sieve synthesis, and discloses a ZSM-5 type molecular sieve as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, carrying out calcination treatment and low-temperature plasma treatment on rectorite to obtain modified rectorite; then adding the modified rectorite and a supplementary silicon source into water, sequentially adding butane-1, 4-bis (dodecyl dimethyl ammonium bromide) and hexadecyl trimethyl ammonium bromide, raising the temperature, adding a template agent, adjusting the pH value of the system, and quickly aging by microwave treatment to obtain a precursor; and finally, heating the precursor, carrying out hydrothermal crystallization reaction, washing, drying and grinding a product, and calcining to obtain the ZSM-5 type molecular sieve. The rectorite is used as all aluminum sources and part of silicon sources for molecular sieve synthesis, the aluminum activity and nucleation sites of the rectorite are improved through modification, then two surfactants are introduced, and microwave treatment is combined, so that silicon and aluminum species in a system are rapidly nucleated, and the efficient, economical and higher-performance ZSM-5 type molecular sieve is prepared.

The invention discloses a method for in-situ synthesis of a hydrogen type hierarchical pore ZSM-5 molecular sieve from binary ash, which comprises the following steps: firstly, mixing aluminum ash, water and fly ash according to a certain proportion, and desalting to obtain binary ash; mixing the binary ash, a pore-enlarging agent and inorganic acid to prepare silicon-aluminum sol; then, mixing the silica-alumina sol with a structure-directing agent, aging, crystallizing, washing, drying and roasting to obtain sodium type hierarchical pore ZSM-5; and finally, mixing the sodium-type hierarchical pore ZSM-5 molecular sieve with ammonium salt, washing and drying to obtain the hydrogen-type hierarchical pore ZSM-5 molecular sieve. The performance of the prepared hydrogen-type hierarchical pore ZSM-5 molecular sieve is equivalent to that of a molecular sieve prepared from a traditional aluminum-silicon source, the external specific surface area reaches up to 650 m < 2 > / g, the mesoporous volume reaches 0.65 m < 3 > / g or above, resource utilization of solid waste and hazardous waste is achieved, environmental pollution is reduced, and the synthesis cost of the hydrogen-type hierarchical pore ZSM-5 molecular sieve is reduced.

The present invention discloses a kind of mesoporous ZSM 5 molecular sieve and preparation method thereof, the preparation method comprises the following steps:Silicon source, aluminum source, alkali source, crystallization inducer, auxiliary agent, water are mixed to obtain crystallized gel, the crystallized gel is crystallized under hydrothermal conditions, washed, filtered, dried, roasted, and mesoporous ZSM 5 molecular sieve is obtained;Wherein, the silicon source is magadiite, the crystallization inducer is organic ammonium salt and seed crystal, and the auxiliary agent is selected from at least one of alcohol or amine. The molecular sieve obtained by the method of the present invention has the characteristics of high crystallinity, large specific surface area, and large micro-mesopore volume. The preparation method of the present invention adopts cheap silicon source, and in the case of adding a small amount of mesoporous template agent, mesoporous ZSM 5 molecular sieve can be synthesized, which is applied to light hydrocarbon catalytic cracking reaction with good low-carbon olefin selectivity.

The present application relates to the technical field of ZSM-5 molecular sieve preparation, and provides a high-crystallinity aluminum-rich ZSM-5 molecular sieve, a preparation method and application thereof.The preparation method of the high-crystallinity aluminum-rich ZSM-5 molecular sieve provided by the present application realizes the skeleton composition control of the ZSM-5 molecular sieve by adding a second aluminum source and then performing secondary crystallization, solves the technical bottleneck that it is difficult to directly synthesize the high-crystallinity aluminum-rich ZSM-5, breaks through the lower limit of the Si / Al ratio phase region of the artificial in-situ synthesis of the molecular sieve, effectively controls the crystal parameter and improves the production efficiency, realizes the precise construction of the high-crystallinity aluminum-rich ZSM-5 molecular sieve, and thus enhances the micropore crystallinity of the molecular sieve, optimizes the acid distribution, greatly enriches the metastable surface active acid center distribution of the molecular sieve, and has good aromatic hydrocarbon conversion performance.

This disclosure relates to methods of preparing a zeolite including heating the dry gel zeolite in a fixed bed reactor to form a zeolite.

The invention relates to the technical field of molecular sieve preparation, and provides a ZSM-5 molecular sieve as well as a preparation method and application thereof. The preparation method of the ZSM-5 molecular sieve comprises the following steps: obtaining a mixed solution containing an aluminum source, an additive, a silicon source, an alkali source, an organic template agent, a ZSM-5 seed crystal and a solvent; performing crystallization treatment and roasting treatment on the mixed solution in sequence to prepare a ZSM-5 molecular sieve; the additive comprises amino acid and / or alcohol; the alkali source comprises a first alkali source containing Na and a second alkali source containing M, and M is selected from at least one of Li, K and Cs. According to the preparation method of the ZSM-5 molecular sieve provided by the invention, the amino acid and / or alcohol component is added as an additive, and more than two different alkali sources are matched for use, so that the ZSM-5 molecular sieve which is low in silica-alumina ratio, high in crystallinity and low in non-framework aluminum content and has nanoscale crystal grains can be prepared.

The invention discloses a method for synthesizing a high-crystallinity zeolite molecular sieve through in-situ crystallization of aluminosilicate minerals, and belongs to the technical field of zeolite molecular sieve synthesis. The preparation method comprises the following steps: preparing a crystal nucleus liquid containing zeolite molecular sieve microcrystals and a solid-phase wafer; mixing aluminosilicate minerals with the crystal nucleus liquid, and respectively roasting at 850-1000 DEG C and 650-800 DEG C to prepare an active mineral silicon source and an active mineral aluminum source; and mixing the active mineral source with additional silicon species, NaOH, a template agent, a crystal nucleus liquid, a solid-phase wafer and water, crystallizing at 90-150 DEG C, and post-processing to obtain the high-crystallinity zeolite molecular sieve. By introducing the crystal nucleus liquid and the solid-phase wafer, silicon and aluminum components in the aluminosilicate mineral are promoted to be converted into the target molecular sieve in situ, the crystallinity of the product is remarkably improved, the synthesis cost is reduced, and the method is suitable for the fields of petrochemical engineering, environmental protection and the like.

Provided in the present application are an acoustic reinforcing material block and an application thereof, a micro loudspeaker and an electronic device. The raw materials of the acoustic reinforcing material block include a porous material, an adhesive, and an adjuvant loaded in a structural framework. The micro loudspeaker comprises an upper housing and a lower housing which form an inner cavity, and a loudspeaker unit located in the inner cavity, wherein the inner cavity is divided into a front cavity and a rear cavity, and the front cavity is in communication with a sound outlet hole; and a front cavity resonant cavity which is in communication with the front cavity and filled with an acoustic enhancing material is provided in the upper housing.

The present disclosure is directed to a method of manufacture of zeolite by a non-classical route. A sol-gel process includes an initial homogeneous aqueous mixture comprising precursors and reagents for forming the zeolite, and water-soluble oxidized disulfide oil (ODSO) as an additional component. The resulting zeolite possesses a hierarchical nature that is improved relative to a comparative zeolite formed in the absence of ODSO, via a classical route, and of approximately equivalent compositional ratio, time and conditions effective for the zeolite.

The invention belongs to the technical field of zeolite catalysts, and particularly relates to a preparation method of hierarchical pore zeolite. Through a high-silicon / pure-silicon seed crystal-selective etching synergistic strategy, in a synthesis stage, more than 30% of high-silicon (silica-alumina ratio (SAR) is greater than or equal to 500) or pure-silicon (SAR-infinity) seed crystals are introduced into a gel system, and most of the seed crystals are ensured to be embedded into a product skeleton in a complete form; in the post-treatment stage, the high-silicon seed crystal area is etched preferentially through an alkaline solution, mesopores are directionally generated, meanwhile, a matrix micropore structure is reserved, and precise customization of the hierarchical pore structure is achieved. The mesopore volume of the prepared hierarchical pore zeolite reaches 0.35 cm < 3 > / g or above, the external specific surface area is increased (180-220 m < 2 > / g vs traditionally smaller than 120 m < 2 > / g), pollution of toxic template agents is avoided, and the method is suitable for large-scale production of multiple types of zeolite such as ZSM-5 and Beta.

This disclosure relates to methods of preparing a dry gel zeolite including drying the zeolite hydrogel under reduced pressure to form a dry gel zeolite.

Provided are a Y / ZSM-5 composite molecular sieve and a preparation method therefor, and a catalytic cracking catalyst. The preparation method comprises: mixing a Y molecular sieve raw material containing a second Y molecular sieve with an alkaline solution of a structure directing agent and carrying out crystallization to obtain a Y / ZSM-5 composite molecular sieve. The method further comprises carrying out drying and compaction treatment before crystallization, and / or, the Y molecular sieve raw material contains a first Y molecular sieve. The composite molecular sieve has two molecular sieve phases and high catalytic performance.

The invention relates to the technical field of synthesis of inorganic porous materials, in particular to a hierarchical pore ZSM-5 molecular sieve and a synthesis method thereof.The method comprises the steps that an aqueous solution of a guiding agent serves as a solvent, an aluminum source is dissolved in the solvent to form a mixed solution, a chelating agent and a silicon source are added into the mixed solution, the chelating agent and the silicon source react to form a chelate, seed crystals are added, and the hierarchical pore ZSM-5 molecular sieve is obtained. According to the present invention, the guiding agent can be adsorbed on the surface of the seed crystal to obtain the mixed gel, and the hierarchical pore ZSM-5 molecular sieve is obtained after the hydrothermal reaction of the mixed gel, and the synthesized hierarchical pore ZSM-5 molecular sieve has the typical MFI type micropore channel, the micropore-mesopore-macropore combined hierarchical pore structure and the ultra-large particle size of 10-35 [mu] m, the method has a huge application prospect in the chemical fields of macromolecular catalysis, adsorption and the like.

The invention belongs to the technical field of petroleum processing and petrochemical engineering catalysts, and particularly relates to phosphorus-doped hierarchical pore ZSM-5 zeolite as well as a preparation method and application thereof. The phosphorus-doped hierarchical pore ZSM-5 zeolite is prepared by a'one-step hydrothermal synthesis method ', the phosphorus element successfully enters a zeolite framework in a stable tetra-coordination form and forms a strong chemical bond with silicon and aluminum atoms, framework-level coordination doping of the phosphorus element and precise construction of micro-mesoporous-multi-level pore channels are synchronously realized, and the phosphorus-doped hierarchical pore ZSM-5 zeolite is prepared. The contradiction between insufficient hydrothermal stability of the hierarchical pore zeolite and pore channel blockage caused by phosphorus modification is successfully overcome. After the prepared zeolite is subjected to hydrothermal treatment at 800 DEG C, the crystallinity retention rate is gt; compared with the prior art, the method provided by the invention has the advantages that the content of the molecular weight is 85%, the physical structure, the chemical stability and the catalytic performance are excellent, an ideal material solution is provided for developing a new generation of long-service-life and high-efficiency petrochemical engineering catalyst (especially olefin cracking, MTO (Methanol To Olefin) and the like), and the method has great scientific value and wide industrial application prospect.

The present application relates to a kind of polycrystalline cluster ZSM-5 molecular sieve and its preparation method and application.The polycrystalline cluster ZSM-5 molecular sieve has at least two typical most probable pore diameters in the range of 5-50nm.During the preparation of the molecular sieve, two alkali sources (M1 and M2) are used, wherein the mass ratio of the two alkali sources M1 / M2 satisfies the following relationship: 0.1≤n(M1) / n(M2)≤10.0.The polycrystalline cluster ZSM-5 molecular sieve has higher propylene selectivity for large molecule naphthene ring-opening cracking.

Provided is a zinc-containing MFI type zeolite formed body with which an aromatic hydrocarbon compound is easily produced even when a reaction for producing an aromatic hydrocarbon compound from an aliphatic hydrocarbon is continued.　The zinc-containing MFI type zeolite formed body is characterized by containing an inorganic binder and an MFI type zeolite, and satisfying the characteristics of following (i)-(iii). (i) The contained amount of the inorganic binder is 5-50 mass%. (ii) When a reduction treatment test is performed under test conditions comprising a test temperature of 600°C, a test atmosphere provided with hydrogen in an amount of 50 mL / minute and nitrogen in an amount of 50 mL / minute, and a test period of 16 hours, the proportion of the zinc content that has decreased due to the reduction treatment test with respect to the zinc content before the reduction treatment test is 30% or less. (iii) The ratio of the zinc content with respect to the acid amount, expressed as Zinc content (mass%) / acid amount (mmol / g), is 1-15.

The invention discloses an alkylphosphine-guided nanosheet P-coated ZSM-5 molecular sieve as well as a preparation method and application thereof, and belongs to the technical field of molecular sieves. According to the nanosheet P-coated ZSM-5 molecular sieve provided by the invention, the crystal contains phosphorus, and the nanosheet P-coated ZSM-5 molecular sieve has an MFI structure and presents a regular nanosheet crystal form; the preparation method of the nanosheet P-coated ZSM-5 molecular sieve comprises the following steps: mixing and stirring a silicon source, an aluminum source, a phosphorus source, a solvent and an MFI type seed crystal, then crystallizing the obtained initial solution, and washing, drying and roasting the obtained product to obtain a nanosheet P-coated ZSM-5 molecular sieve material containing phosphorus in the crystal, according to the method, the phosphorus-containing nanosheet ZSM-5 molecular sieve is synthesized by using an MFI type seed crystal and alkyl phosphorus as a template agent and a phosphorus source in a one-step oriented manner; the preparation process is simple and environment-friendly, and the obtained molecular sieve material has a uniform and regular hexagonal prismatic crystal structure and shows a good catalytic effect and long service life.

The invention provides a preparation method of a copper-containing molecular sieve, which comprises the following steps: mixing an H-type molecular sieve with a nitrate solution, stirring at 60-100 DEG C for 2-3 hours, and filtering to obtain a solid A; adding the solid A into a solution containing Cu ions, stirring at 10-30 DEG C for 20-48 hours, filtering and drying to obtain a solid B; heating the solid B to 500-600 DEG C from 10-30 DEG C through 1-2 hours under the air flow with the flow speed of 30-80 mL / min, keeping the temperature for 1-2 hours, and then naturally cooling to obtain a solid C; and heating the solid C from 10-30 DEG C to 200-250 DEG C through 0.2-1 hour under a mixed gas flow which is 40-60 mL / min in flow velocity and contains 5-15 vol% of H2 and the balance of argon or nitrogen, preserving heat for 1-2 hours, and then naturally cooling to obtain the copper-containing molecular sieve. The copper-containing molecular sieve prepared by the method disclosed by the invention can realize alkane activation at normal temperature and normal pressure, chemicals with higher additional value are obtained with high selectivity, and the copper-containing molecular sieve has better cycle performance and very good application prospect.

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.

The invention relates to the technical field of molecular sieve synthesis, in particular to a sheet ZSM-5 molecular sieve as well as a preparation method and application thereof. The preparation method of the sheet ZSM-5 molecular sieve comprises the following steps: S1) uniformly mixing an aqueous solution of a silicon source, a mineralizer, an aluminum source and a seed crystal to obtain gel; and S2) mixing the gel with a growth inhibitor, crystallizing, and calcining to obtain the sheet ZSM-5 molecular sieve. A mineralizer and a growth inhibitor are introduced in a molecular sieve crystallization process, and the sheet ZSM-5 molecular sieve is directly prepared by a one-pot method. The method is simple and convenient to operate and simple in step, and the prepared sheet molecular sieve has the characteristics of high specific surface area and short b axis, and is beneficial to reducing the diffusion resistance of macromolecular substrates and products. The molecular sieve is used as an active component in a naphtha cracking catalyst, and shows excellent conversion rate and diene selectivity in a naphtha cracking reaction.

The present invention discloses a binderless ZSM-35 molecular sieve catalyst, a preparation method thereof, and an application thereof. In the binderless ZSM-35 molecular sieve catalyst, based on the weight of aluminum in the catalyst, the content of framework aluminum is 58% to 82%, and the content of non-framework aluminum is 18% to 42%. When this catalyst is used in the skeletal isomerization reaction of C4 olefins, it has a higher yield of the target product isobutene and good long-term stability.

A method for producing pyrolysis oil from used plastics is provided, the method comprising (i) supplying used plastic material, (ii) melting the used plastic material to form molten plastic material, (iii) pyrolysis of the molten plastic material in an oxygen-free atmosphere to yield pyrolysis gas and carbonized material, and (iv) condensing the pyrolysis gas to yield pyrolysis oil, the method further comprising dispersing a zeolite material in the used plastic material or molten plastic material, the zeolite material comprising a zeolite having a molar ratio of silica to alumina (SAR) of 10 to 140 and an average crystal diameter of about 200 nm or less, and the zeolite material having a thickness of at least 0.30 cm 3 Mesopore volume of / g and at least 0.10 cm 3 It has a micropore volume of / g.

The invention discloses a method for preparing a ZSM-5 molecular sieve by in-situ crystallization of kaolin and application of the ZSM-5 molecular sieve. A catalytic cracking catalyst for petroleum hydrocarbons mainly depends on ZSM-5 molecular sieves as active components, so that a green synthesis mode for developing a molecular sieve catalyst with good performance is very important. The preparation method comprises the following steps: uniformly stirring a NaZSM-5 molecular sieve, kaolin, water glass, aluminum hydroxide, silica sol, magnesium chloride and the like, performing spray granulation, performing segmented roasting to activate aluminum and silicon elements in the kaolin, and finally adding sodium hydroxide and ethanol for dynamic crystallization, pickling and roasting to obtain the molecular sieve. The molecular sieve can be used as an active component in light hydrocarbon cracking, has a rich pore structure and a larger specific surface area, is beneficial for oil-gas components to enter pores of the molecular sieve, is short in diffusion path, is higher in mass transfer rate in the reaction process, can quickly diffuse out a generated product, and can more effectively improve the conversion rate of the reaction. In a catalytic cracking reaction, the molecular sieve has better reaction stability while increasing the yield of ethylene and diene.

This invention discloses a highly crystalline hierarchical porous ZSM-5 molecular sieve and its preparation method. The method mainly utilizes the capillary effect of the microporous molecular sieve, uniformly dispersing a passivating agent within the sieve channels. Under rapid drying conditions, the molecular sieve framework is passivated, followed by alkali and acid treatment, and finally calcination to obtain the target product of this invention. This invention offers high product yield, and the prepared ZSM-5 molecular sieve product exhibits high crystallinity, large total specific surface area, regular mesoporous channels, and a rich mesoporous system. Compared with direct alkali and acid treatment methods, this invention's preparation method can significantly maintain the original molecular sieve's crystallinity and retain its microporous system, which is beneficial for applications in catalysis, adsorption, and other fields. This invention's method is easy to industrialize and is environmentally friendly.

The application discloses a synthesis method of a phosphorus-containing ZSM-5 molecular sieve, which comprises the following steps: mixing a silicon source, an aluminum source, a template agent, alkali, water and a small amount of a phosphorus source in steps, moving into a stirring kettle for dynamic crystallization to obtain a crystallization intermediate product, further mixing slurry containing the crystallization intermediate product with a phosphorus-containing solution, adjusting the pH of the solution and performing hydrothermal treatment, then evaporating the solution to obtain a dry gel, crystallizing the dry gel under ammonia steam auxiliary conditions, and finally performing washing, filtering, drying and calcining in sequence to obtain the phosphorus-containing ZSM-5 molecular sieve. The method can efficiently introduce the phosphorus element into the ZSM-5 molecular sieve, inhibit the removal of framework aluminum, improve the acid properties, thereby improving the hydrothermal stability and catalytic reaction performance of the molecular sieve, and has important application value in the field of light hydrocarbon catalytic cracking for preparing low-carbon olefins and the like.

To provide a method for efficiently removing butanol, dibutyl phosphate, etc. contained as impurities in tributyl phosphate.SOLUTION: A method for producing tributyl phosphate includes a step for bringing crude tributyl phosphate into contact with an aluminosilicate compound in which a molar ratio (SiO2 / Al203) of silica and alumina in a zeolite skeleton is 10 or more.SELECTED DRAWING: None

having a K value that satisfies 70%≦K≦90%, for example 75%≦K≦90%, further for example 78%≦K≦85%; K = P1 / P2 × 100% The present invention provides a phosphorus-modified MFI molecular sieve, wherein P1 represents the mass content of phosphorus within a region having an area of ​​100 square nanometers and a vertical depth of 0 to 2 nm on any crystal face of the molecular sieve crystal grain, as measured by XPS, and P2 represents the mass content of phosphorus within a region having an area of ​​100 square nanometers and a vertical depth of 5 to 10 nm on any crystal face of the molecular sieve crystal grain, as measured by EPMA. The present invention also provides a catalytic cracking aid and a catalytic cracking catalyst containing the phosphorus-modified MFI molecular sieve, as well as methods for preparing and using the same.

This invention discloses a method for preparing ZSM-5 molecular sieves using a microwave-assisted method with desilication solution, comprising the following steps: First, pretreatment of the desilication solution: the desilication solution is mixed with an oxyacid to adjust the pH to 9-11.5, a template agent is added and mixed evenly to obtain an initial gel; Second, preparation of the ZSM-5 molecular sieve: the initial gel obtained in the first step is placed in a microwave synthesizer for aging with high-speed stirring; the aged solution undergoes a crystallization reaction, followed by filtration, washing, drying, and high-temperature calcination to obtain the ZSM-5 molecular sieve. This invention uses desilication solution as a raw material to prepare ZSM-5 molecular sieves, saving material costs and providing a new approach for the high-value utilization of desilication solution. Furthermore, by utilizing microwave-assisted synthesis on the basis of the traditional hydrothermal method, the time cost is effectively shortened.