207results 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.

The invention relates to silicon powder as well as a preparation method and application thereof. In an ultraviolet Raman spectrum of the silicon powder, no characteristic peak exists near 240 cm <-1 >; or, in the ultraviolet Raman spectrum of the silicon powder, in a characteristic region with the vibration frequency not larger than 600 cm <-1 >, at least one characteristic peak not larger than 240 cm <-1 > exists, and the sum of the peak areas of the characteristic peaks not larger than 240 cm <-1 > accounts for more than or equal to 20% of the total area of the characteristic peaks in the characteristic region with the vibration frequency not larger than 600 cm <-1 >. The silicon powder disclosed by the invention can be applied to synthesis of a silicon-containing crystalline state material, and has the characteristics of good uniformity, easiness in activation and crystallization, low dependence on an organic template agent, shortening of a crystallization induction period and the like.

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.

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.

The invention relates to the field of preparation of molecular sieves, and discloses a preparation method of an all-silicon molecular sieve with an MFI topology structure, the all-silicon molecular sieve with the MFI topology structure and application of the all-silicon molecular sieve with the MFI topology structure, the method comprises the following steps: (1) mixing molecular sieve mother liquor, organic silicate ester, an organic template agent and alcohol to obtain a colloid mixture; the mass ratio of SiO2 in the molecular sieve mother liquor to the organic silicate ester based on SiO2 is (0.01-0.2): 1; the molar ratio of the alcohol to SiO2 in the molecular sieve mother liquor is (10-100): 1; (2) carrying out crystallization reaction on the colloid mixture; (3) carrying out solid-liquid separation on the crystallization product obtained in the step (2) to obtain a molecular sieve wet material and crystallization mother liquor; drying and roasting the molecular sieve wet material; and (4) optionally concentrating the crystallized mother liquor, and then returning to the step (1). The preparation method can effectively utilize the molecular sieve mother liquor, saves the cost, is beneficial to environmental protection, and is easy to operate.

A Silicalite-1 (at) ZSM-5 core-shell molecular sieve takes a Silicalite-1 molecular sieve as a core layer and a ZSM-5 molecular sieve as a shell layer, the particle size is 90-140nm, and a preparation method of the Silicalite-1 (at) ZSM-5 core-shell molecular sieve comprises the following steps: (1) mixing a template agent, a first silicon source and water to obtain a core-layer molecular sieve synthesis system, and performing aging I and crystallization I to obtain an intermediate product; and (2) mixing the intermediate product obtained in the step (1), an aluminum source, a second silicon source, an alkali source, a zwitterion balancing agent and water to obtain a shell molecular sieve synthesis system, carrying out aging II and crystallization II, washing and drying the obtained solid, and roasting to obtain the Sillicalite-1-coated ZSM-5 core-shell molecular sieve. The molecular sieve is high in carbon capacity, simple in preparation method and low in cost, and can be used for a low-carbon alkane catalytic cracking reaction, a heavy aromatic hydrocarbon lightening reaction and a light hydrocarbon aromatization reaction.

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.

This crystal contains multiple molecules of a silanol compound represented by formula (1), and exhibits an interaction among the multiple molecules of the silanol compound via a hydrogen bond provided by at least one hydroxy group of the silanol compound.

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

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.

This separation membrane composite body (1) is provided with: a porous supporting body (11); an intermediate membrane (12) which is a polycrystalline membrane that is provided on a surface of the supporting body (11), while having pores that are derived from the skeleton structure and have a smaller average pore diameter than the pores in the vicinity of the surface of the supporting body (11); and a separation membrane (13) which is an inorganic membrane that is provided on the intermediate membrane (12), while having a regular pore structure. With respect to the separation membrane (13), a functional group is introduced into pores in a surface layer (14) that is away from the intermediate membrane (12). With respect to this separation membrane composite body (1), the separation membrane (13) is appropriately formed on the porous supporting body (11); and the permeation rate of a specific substance is able to be increased in the separation membrane (13) into which the functional group has been introduced.

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.

The present invention relates to mesoporous silica particles functionalized with at least one group having an acidic functionality and / or at least one group having a hydrophobic functionality anchored to the silica by means of a silicon-oxygen bond. The acidic functionality is preferably an alkyl group bearing a group selected from -SO3H, -COOH, -PO(OH)2. The hydrophobic functionality is preferably a saturated, linear alkyl group. The invention also relates to the use of the mesoporous silica particles for the removal of proteins from and / or the reduction of the concentration of several metals in a beverage having a pH lower than 4, preferably wine, beer, cider, and a combination thereof.

A sphere-like ultra-macroporous mesoporous material, a polyolefin catalyst, a method for preparing the same, and an olefin polymerization process are disclosed. The sphere-like ultra-macroporous material has a two-dimensional hexagonal ordered pore channel structure; the mesoporous material has an average pore diameter of 10 nm to 15 nm, and an average pore diameter of 300 nm. 2 / g~400m 2 The mesoporous material has a specific surface area of ​​1 / g and an average particle size of 1-3 μm; the water content by mass in the mesoporous material is less than 1 ppm, and the oxygen content by mass in the mesoporous material is less than 1 ppm, based on the total mass of the mesoporous material. When polyolefin catalysts prepared using mesoporous materials as supports are used in olefin polymerization reactions, the catalysts exhibit high catalytic efficiency and can produce polyolefin products with narrow molecular weight distributions and good melt indices.

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.