114results about "Molecular-sieve silica-polymorphs" patented technology

A composition of matter is provided comprising hierarchically ordered crystalline microporous material having well-defined long-range mesoporous ordering of lamellar symmetry. The composition possesses mesopores having walls of crystalline microporous material and a mass of mesostructure between mesopores of crystalline microporous material. Long-range ordering is defined by presence of secondary peaks in an X-ray diffraction (XRD) pattern and / or lamellar symmetry observable by microscopy.

Methods are provided for hydrothermal synthesis of b-oriented MFI zeolite. The method generally comprises forming a solution of precursors and reagents in effective ratios for a b-oriented MFI zeolite including a fluoride-containing mineralizer, and water-soluble oxidized disulfide oil. The solution is hydrothermally treated under effective conditions and for an effective time to synthesize b-oriented MFI zeolite.

Methods are provided for hydrothermal synthesis of porous crystalline materials. The method generally comprises forming a solution of precursors and reagents in effective ratios for a porous crystalline material including a fluoride-containing mineralizer, and water-soluble oxidized disulfide oil. The solution is hydrothermally treated under effective conditions and for an effective time to synthesize porous crystalline materials.

The invention discloses a method for preparing a b-axis oriented MFI type molecular sieve separation membrane through in-situ crystallization. The method comprises the following steps: firstly, preparing a graphite transition layer on the surface of a porous carrier, then directly putting the modified porous carrier into a high-pressure synthesis kettle filled with synthesis liquid, crystallizing, washing with deionized water, and drying to obtain a b-axis oriented MFI type molecular sieve separation membrane product. According to the present invention, with the in-situ crystallization method, the seed crystal synthesis in the secondary growth method and the construction process of the carrier surface orientation seed crystal layer are avoided, the preparation process of the b-axis orientation MFI type molecular sieve membrane is simplified, and the obtained product can be used for the separation of the ethanol / water and other mixed systems, and has important application value in the actual chemical industry production field.

To provide a carbon carrier for a fuel cell catalyst, a fuel cell catalyst, a fuel cell catalyst layer, and a method for manufacturing the carbon carrier that can improve the power generation performance of a fuel cell.SOLUTION: In a carbon carrier with pores, the thickness of a carbon wall of the carbon carrier, which is derived from a three-dimensional pore structure of a silica mold obtained by measuring the pore volume of the silica mold using a nitrogen adsorption analysis method, is 3.3 nm or more and 11.2 nm or less, and a carbon wall content is more than 60.3 ml / g and less than 190.8 ml / g.SELECTED DRAWING: Figure 1

This disclosure relates to the use of 1-methyl-6,7-dihydro-5H-cyclopenta[b]pyridine-1-ium cation as structure directing agent (SDA) for the preparation of EMM-65. This disclosure also relates to compositions of matter, designated as EMM-65, obtainable by using this SDA, as well as a method of making the same and uses thereof.

A composite comprising: a skeleton having a porous structure and containing a crystalline Si02 compound; and a fine particle including a metal oxide fine particle or a metal fine particle existing within the skeleton.

The invention discloses a pure silica zeolite DD3R hydrogenation catalyst as well as a preparation method and application thereof. The pure silica zeolite DD3R hydrogenation catalyst takes a DD3R molecular sieve as a carrier, and a Cu element and a Pd element are loaded on the carrier; in the pure silica zeolite DD3R hydrogenation catalyst, the mass ratio of the Pd element is 0.2 wt%-0.6 wt%, and the mass ratio of the Cu element is 0.2 wt%-0.7 wt%. The preparation method comprises the following steps: adding the structure-directing agent, the silicon source and the mineralizing agent into deionized water, and uniformly mixing; adding a palladium source and a copper source, then adding a seed crystal, and crystallizing for a certain time; and carrying out suction filtration, washing, drying, roasting and the like on the obtained sample to prepare the pure silica zeolite DD3R hydrogenation catalyst. The catalyst prepared by the invention is used for a reaction for removing trace acetylene in ethylene through thermocatalytic hydrogenation, has high specific surface area, high catalytic activity, high selectivity and high thermal stability, and can still keep relatively high catalytic activity at a high space velocity.

This disclosure relates to the use of 1-methyl-6,7-dihydro-5H-cyclopenta[b]pyridine-1-ium cation as structure directing agent (SDA) for the preparation of aluminosilicate RTH framework type zeolites. This disclosure further relates to a method of making an aluminosilicate molecular sieve of RTH framework type using said SDA, aluminosilicate molecular sieves of RTH framework type obtainable by said method, and uses thereof.

To provide a metal-doped porous silica which can be stably dispersed and maintained by being blended with an article such as a cosmetic exemplified by a permanent wave treatment agent.SOLUTION: The metal-doped porous silica of the present invention is surface-modified with a polymer containing a vinylpyrrolidone unit. Specific examples of the polymer containing a vinylpyrrolidone unit include a copolymer of vinylpyrrolidone and dimethylaminoethyl methacrylate, and polyvinylpyrrolidone.SELECTED DRAWING: None

The invention relates to a method for preparing a silica-based magnetic mesoporous material (MSM), said method comprising the steps of: i) Functionalizing the silanol (-SiOH) groups of a silica-based mesoporous material by covalent grafting of a ligand (L) comprising, at at least one end, a zwitterionic group of formula (I), particularly capable of complexing superparamagnetic particles: where n is an integer equal to 3 or 4; ii) Incorporating superparamagnetic ferrite particles (MFe2O4NP) within the mesoporous material, thereby obtaining a silica-based magnetic mesoporous material (MSM). Figure for the abstract: none

This disclosure relates to the use of 1-methyl-6,7-dihydro-5H-cyclopenta[b]pyridine-1-ium cation as structure directing agent (SDA) for the preparation of zeolites. This disclosure also relates to compositions of matter, designated as EMM-64 and EMM-65, obtainably by using this SDA, as well as a method of making the same and uses thereof. This disclosure further relates to a method of making an aluminosilicate molecular sieve of RTH framework type using said SDA, aluminosilicate molecular sieves of RTH framework type obtainable by said method, and uses thereof.

The present invention discloses a speaker and electronic device improved by an ITH molecular sieve. The ITH molecular sieve is loaded into the back chamber of the speaker. The ITH molecular sieve consists of a framework containing silica and an oxide of the non-silicon element M, and an extra-framework cation. The Si / M molar ratio is at least 80, preferably 100 or more. The ITH molecular sieve has a pore size of 0.4 Å to 0.55 Å and a pore volume of 0.10 to 0.25 cm³. 3 It contains uniform pores with a density of / g. Including an ITH molecular sieve in the speaker's back chamber increases the acoustic compliance of the air in the back chamber, improving the speaker's performance in the low-frequency range.

The application belongs to the technical field of molecular sieve, and provides a nanosheet MFI type molecular sieve, a preparation method and application thereof. The method comprises the following steps: mixing tetraethyl orthosilicate, tetrapropylammonium hydroxide and water, and aging to obtain an intermediate solution; mixing the intermediate solution, ammonium fluoride and water, and crystallizing to obtain the nanosheet MFI type molecular sieve. In the application, ammonium fluoride is introduced into a MFI type molecular sieve synthesis solution as a mineralizer, the morphology, b-axis thickness and twin crystal number of the nanosheet MFI type molecular sieve are adjusted by changing the aging time and the crystallization time, and finally, the nanosheet MFI type molecular sieve with uniform particle size, regular structure and almost no twin crystal is prepared, which can meet the customized synthesis demand of nanoscale zeolite materials. The MFI type molecular sieve membrane prepared by using the nanosheet MFI type molecular sieve prepared by the application has good gas separation value.

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.

A novel synthetic crystalline molecular sieve material, designated boron ITQ-21, is provided. The boron ITQ-21 can be synthesized using an N,N-diethyl-5,8-dimethyl-2-azonium bicyclo [3.2.2] nonane cation as a structure directing agent. The boron ITQ-21 may be used in organic compound conversion reactions and / or sorptive processes.

The present invention relates to a specific continuous process for preparing a zeolitic material having a framework structure type selected from the group consisting of MFI, MEL, IMF, SVY, FER, SVR, and intergrowth structures of two or more thereof, preferably having an MFI and / or MEL type framework structure, and containing Si, Ti, and O, and to a zeolitic material obtainable and / or obtainable according to said process. Furthermore, the present invention relates to a process for preparing a shaped article, and to a shaped article obtainable and / or obtainable according to said process. Furthermore, the present invention relates to methods for using said zeolitic material and shaped article.

The present invention relates to MFI-type silicalite-1 zeolite crystals, which are individual crystals having a three-dimensional morphology whose cross section parallel to its longest dimension corresponds to the shape of a straight-cut disk (or ellipse). The present invention also relates to a method for synthesizing said crystals and their use as zeolitic adsorbents.

The present invention relates to a method for preparing an inorganic monolith with multi-scale porosity, comprising: a) a step of emulsification of an oily phase in an acidic aqueous phase, wherein: a1) the aqueous phase comprises at least one acid, at least one surfactant and at least one inorganic precursor; a2) the oily phase is added to the mixture obtained in step a1); a3) the mixture obtained in step a2) is subjected to mechanical rotary stirring, preferably at a rotational speed of more than 100 revolutions per minute, in order to obtain an emulsion; b) a step of polycondensation of the emulsion obtained in step a3), preferably for 1 day to 20 days, in order to obtain a gel; c) a step of drying the gel obtained in step b); d) a first step of calcination at a temperature of between 160°C and 200°C, with a heating rate of between 0.5 and 3°C / min, the plateau being maintained for a period of 2 to 6 hours, preferably 3 hours; and e) a second step of calcination at a temperature of between 300°C and 900°C, preferably between 400°C and 800°C, with a heating rate of between 0.5 and 2°C / min, the plateau being maintained for 3 to 8 hours, preferably 7 hours.

The present disclosure relates to a kind of multi-level hole pure silicon molecular sieve and its preparation method and cyclohexanone oxime catalytic reaction method.The multi-level hole pure silicon molecular sieve has the following diffusion coefficient characteristics: with cyclohexane as probe molecule, the diffusion coefficient of the probe molecule in the multi-level hole pure silicon molecular sieve is 0.015-0.02 μm 2 / min, measured by zero-length column method.The present disclosure can effectively improve the molecular diffusion performance of molecular sieve, and when the molecular sieve is used for cyclohexanone oxime gas phase Beckmann rearrangement reaction, the selectivity of caprolactam and the service life of catalyst can be effectively improved.

The application discloses a porous molecular sieve material, which has at least three concave arcs and at least two adsorption-desorption hysteresis loops in a low-temperature nitrogen adsorption isotherm curve. A preparation method of the porous molecular sieve material comprises the following steps: mixing a molecular sieve containing silicon as a first skeleton element with polyquaternary ammonium base, water and optionally added small-molecule nitrogen-containing basic compounds, treating the mixture at a temperature of 100-200 DEG C for 1-72 hours, and separating at least part of solid products from the treatment product and drying and calcining the solid products.

Provided is a compound having a pore structure in which one or more types of silanol compound selected from the group consisting of an octamer represented by formula (1), a decamer represented by formula (2), and a dodecamer represented by formula (3) are regularly arranged by being bonded to each other by dehydration condensation.

Present invention generally concerns a novel use of electro-assisted synthesis apparatus to manufacture of heteroatom zeolites with good metal incorporation, for instance Sn- zeolites, Ti-zeolites, Zn-zeolites, Fe-zeolites or Al-zeolites with a higher metal load than reached by the current state of the art heteroatom zeolites synthesis method. More particularly, it relates to heteroatom zeolites that are the reaction product of gradual metal incorporation in zeolites during the zeolite synthesis process the metal originating from an in-situ anodic oxidation.

To provide a functional structure capable of realizing a long life by suppressing functional deterioration of a functional substance.SOLUTION: A functional structure comprises a porous structure carrier composed of a zeolite-type compound and at least one functional substance contained in the carrier. The carrier has passages communicating with each other, the functional substance exists in at least the passages of the carrier, the functional substance contained in the carrier contains a metal element (M), and the content of the metal element (M) is more than 2.5 mass% with respect to the functional structure.SELECTED DRAWING: Figure 1

Methods of making hierarchically ordered crystalline microporous materials are provided. The method may include forming an aqueous suspension comprising a parent crystalline microporous material, an alkaline reagent, a supramolecular template, and a silica source material, an alumina source material, or both. The method may further include hydrothermally treating the aqueous suspension to form the hierarchically ordered crystalline microporous material. The hierarchically ordered crystalline material may have a greater degree of mesoporosity than the parent crystalline microporous material and may have a silica-to-alumina ratio (SAR) that is at least 0.5 different than the parent crystalline microporous material.

The present invention provides a preparation method and application of a modified molecular sieve. The preparation method includes: Step S1, mixing a silicate compound, a quaternary ammonium template agent and water, and then successively performing a hydrolysis reaction and distillation to obtain a sol mixture and a fraction with a boiling range of 60-100 °C; Step S2, successively performing a crystallization reaction and liquid separation on the sol mixture to obtain an aqueous solution and an organic solution; Step S3, adjusting the pH value of the aqueous solution to 7-10, and then successively performing a first solid-liquid separation, a first drying and a first calcination to obtain a molecular sieve precursor; Step S4, mixing the fraction with a boiling range of 60-100 °C, the organic solution and the molecular sieve precursor, and then successively performing etching, a second solid-liquid separation, a second drying and a second calcination to obtain a modified molecular sieve. When the modified molecular sieve prepared by the present invention is used as a catalyst for synthesizing caprolactam, it has high selectivity and conversion rate, long operating life, environmental friendliness and better catalytic performance.

The present application relates to a kind of full silicon molecular sieve and its preparation method and application, alkali source, template agent, silicon source are added into water and mixed uniformly, then template agent is added in guiding gel, obtain reaction mixture, using variable temperature section crystallization, after rapid heat treatment calcination, full silicon Silicalite-1 Molecular sieve is prepared, the molecular sieve prepared can be used for selective separation of small molecule gas and VOCs gas adsorption purification.Compared with prior art, in the synthesis process, guiding gel is used to provide a large number of original crystal nucleus for synthesis system, can improve the crystallization rate of molecular sieve, shorten crystallization time. Meanwhile, template agent is added in guiding gel, the original crystal nucleus of molecular sieve in it induces the crystallization of molecular sieve, can greatly reduce the dosage of template agent in synthesis reaction solution, reduce cost.

The present invention relates to methods for synthesizing MFI zeolite nanosheet (ZN) assemblies and open-pore ZN plates and for tiling ZN plates on polymer supports. Methods for producing ZN assemblies and ZN plates may reduce or eliminate the need to synthesize nanoparticle (NP) seed-evolved single-crystal zeolite nanosheets (ZNs) as an intermediate product. Methods for tiling ZN plates on polymer supports may produce ZN plate-tiled (ZNPT) membranes with reduced permeation through intercrystalline spaces.