36results about "Aluminosilicate zeolite type-L" patented technology

Embodiments of the invention generally provide compositions of crystalline zeolite materials with tailored crystal habits and the methods for forming such crystalline zeolite materials. The methods for forming the crystalline zeolite materials include binding one or more zeolite growth modifiers (ZGMs) to the surface of a zeolite crystal, which results in the modification of crystal growth rates along different crystallographic directions, leading to the formation of zeolites having a tailored crystal habit. The improved properties enabled by the tailored crystal habit include a minimized crystal thickness, a shortened internal diffusion pathlength, and a greater step density as compared to a zeolite having the native crystal habit prepared by traditional processes. The tailored crystal habit provides the crystalline zeolite materials with an aspect ratio of about 4 or greater and crystal surfaces having a step density of about 25 steps/μm² or greater.

A method of preparing a catalyst comprising selecting a zeolite having a mean particle size of equal to or less than about 6 microns, blending the zeolite with a binder and water to form a paste, shaping the paste into a bound zeolite support, adding a metal to the bound zeolite support to form a metalized catalyst support, and adding at least one halide to the metalized catalyst support to form the catalyst. A catalytic reforming process for converting hydrocarbons to aromatics comprising: contacting a catalyst comprising a silica bound zeolite, a Group VIII metal supported thereby, and at least one halide with a hydrocarbon feed in a reaction zone under reforming conditions and recovering aromatics from the reaction zone, wherein the silica bound zeolite comprises a zeolite having a mean particle size of equal to or less than about 6 microns and a median particle size of equal to or less than about 5 microns.

The present invention discloses a method for the intercalation of a chromophore within channels of a zeolite L crystal. The intercalated chromophores exhibit J type aggregation of the chromophores within the channels of the zeolite L crystals. The invention discloses method parameters which lead to the J type aggregation of the chromophores within the channels of the zeolite L crystals. The J type aggregation of the chromophores affords unique florescent properties rendering the intercalated zeolite L crystals as a material for use in novel optoelectronic devices.

The invention relates to a preparation method of L-zeolite. The preparation method comprises the following steps of: uniformly mixing solid silicon dioxide with silica sol, regulating the pH value of a system to 7-8, then forming, drying and calcining at the temperature of 300-900 DEG C for 1-6 hours to get a pre-formed body; adding solid sodium aluminate and potassium hydroxide into deionized water, and stirring till a solution is transparent to get a crystallized solution, wherein the molar ratio of KOH/AL2O3 is 1-20, and the molar ratio of H2O/Al2O3 is 10-120; adding the prepared pre-formed body into the crystallized solution, wherein the weight ratio of the crystallized solution to the pre-formed body is 2-10; and uniformly mixing, then performing hydrothermal crystallization for 6-24hours at the temperature of 100-180 DEG C, filtering, washing, and drying to get the in-situ crystallized L-zeolite. The crystallized L-zeolite has higher relative degree of crystallization and larger pore volume of mesopores, the pore diameter of the mesopores is 5-10nm, and an n-alkane aromatization catalyst prepared by taking the L-zeolite as a carrier has higher yield of arene.

The invention discloses a method for synthesizing a molecular sieve containing a transition metal heteroatom LTL structure. The method is characterized by comprising the following steps: mixing a heteroatom metal source, a coordinating complexing agent, an aluminum source, potassium hydroxide, a silicon source and water according to the atomic molar ratio of (0.001-0.1): (0.1-1.0): (0.04-0.2): (0.7-1.2): 1.0: (12-50), uniformly stirring, then performing crystallization reaction at the temperature of 150-180 DEG C for 24-72h, performing suction filtration and washing on a reaction solution, and then drying at the temperature of 100-200 DEG C to prepare a product, namely the molecular sieve containing the transition metal heteroatom LTL structure. Compared with the prior art, the method has the advantages of simple process, a variety of applicable heteroatom metals, extensive raw material sources and low cost, and can better solve the difficult problem of precipitation of a heteroatom transition metal source under strong alkaline conditions, thereby being a preparation process for synthesizing the molecular sieve containing the transition metal heteroatom LTL structure, which is easy to realize industrial implementation, mild in reaction conditions and environment-friendly.

The invention relates to methods for preparing an L-type zeolite guiding agent and preparing an L-type zeolite by using the guiding agent. The preparation method of the L-type zeolite comprises the following steps: adding a synthetic mixture with the molar ratio range of K2O/(K2O+Na2O)=(0.6-1):1, (K2O+Na2O)/SiO2=(0.35-0.5):1, SiO2/Al2O3=1:(0.003-0.0005), solvent/(K2O+Na2O)=(100-1000):1, and template agent R/SiO2=(0.01-0.02):1 into the guiding agent, stirring evenly, then adding a corresponding template agent R, carrying out microwave heating to 150 DEG C, crystallizing, carrying out a reaction for 24 hours to obtain a colloidal suspension of the L-type zeolite, carrying out centrifugal treatment on the colloidal suspension with a high-speed centrifugal machine, removing the supernatant, carrying out water washing treatment on the remaining precipitate repeatedly, then washing with anhydrous ethanol cleanly until a clear liquid is colorless, and then drying to obtain the L-type zeolite, wherein the solid components in the molar ratio formula are calculated according to oxides.

A coating comprising a metal-organic framework, wherein the metal-organic framework having a zeolitic structure comprising at least one multivalent metal species and at least one organic ligand (such as zeolitic imidazolate framework (ZIF)). Said coating has a topography comprising an array of projections, and each projection having at least one tapered distal end. There is also provided a method of coating substrates with the disclosed coating and use of said coating as a disinfectant, an antiseptic, or an antibiotic. Such use is possible because the tapered distal end of the disclosed zeolitic structure exerting higher pressure on any microbial cell that comes into contact with the disclosed coating, thereby piercing through the cell membrane more easily, causing cell deformation and lysis.

This invention relates to a process for producing aluminium silicates in the form of zeolite L, as well as the intermediate and end products of this process. The invention further relates to the use of these aluminium silicates for the conversion or adsorption of hydrocarbons.

An oriented zeolite material comprises a plurality of zeolite crystals (2) arranged on a substrate (4), each one of said crystals having a proximal face (6) adjacent to said substrate and a distal face (8) opposed therefrom and substantially parallel to said proximal face. Each one of said crystals has a plurality of straight through uniform channels (10) extending between the proximal face and the distal face and having a channel axis parallel to and a channel width transverse to a longitudinal crystal axis A. Each channel has a proximal channel end (12) located at the proximal face and a distal channel end (14) located at the distal face, and each crystal is attached to the substrate by means of a linking layer (16) that substantially occludes the proximal channel ends.

The invention discloses a preparation method of appearance-controllable L zeolite. The method uses villaumite as an additive; a synthesis method of L zeolite appearance regulation through sectioned crystallization is used. The method comprises the concrete steps of mixing a silicon source with an aluminum source; performing static aging at 5 to 60 DEG C for 2 to 72 hours to obtain a guiding agent;then, mixing the silicon source, the guiding agent, the aluminum source and villaumite to obtain glue, wherein the mole ratio of all ingredients in the reaction mixture gel is 8 to 20K2O:Al2O3:20 to60SiO2:120 to 800H2O: 0.03 to 0.3F<->; then, performing two-stage static crystallization at different temperatures, wherein the first-stage crystallization temperature is 5 to 60 DEG C, and the firststage crystallization time is 12 to 48 hours; the second stage crystallization temperature is 120 to 180 DEG C, and the second stage crystallization time is 12 to 72 hours; finally, performing filtering, washing and drying to obtain an L zeolite molecular sieve. The obtained molecular sieve has high relative crystallinity degree; the appearance is in a particle shape, a round cake shape and a double-cone shape. The preparation method has the advantages that the raw materials can be easily obtained; the preparation cost is low; good industrial application prospects are realized.

The invention relates to an L-type molecular sieve containing germanium and a preparation method thereof. The molecular sieve has the chemical composition of (0.8-1.3)M.(0.001-0.007)GeO2.Al2O3.(4-7)SiO2, wherein M is K2O or a combination of K2O and Na2O. The L-Type molecular sieve provided by the invention is used for preparing an aromatization catalyst, and has good aromatization conversion rate,target aromatics yield and stability.

The invention discloses a KL molecular sieve and a morphology control synthesis method thereof. The method comprises the following steps: mixing potassium salt, potassium hydroxide, an aluminum source, a silicon source and water according to a molar ratio of (1-15):(2-4):1:(6-15):(150-350), sequentially conducting stirring, aging and hydrothermal crystallization, and conducting separating, washing and drying to obtain the KL molecular sieve. Compared with other KL molecular sieve morphology regulation and control methods, the technical scheme provided by the invention does not need to add an organic alcohol or amine structure-directing agent, does not need to change the silica-alumina ratio and alkalinity of a synthesis system to a great extent, is simple in method, wide in raw material source and low in cost, and has remarkable synthesis and cost advantages, and the maximum yield of a single synthesis kettle can reach 80% or above.

The invention discloses a dynamically synthesized KL molecular sieve without a structure-directing agent, and a preparation method thereof. The preparation method comprises the following steps: mixing potassium hydroxide, an aluminum source, a silicon source and water according to a molar ratio of (4-7): 1: (12.0-18.0): (150-350), stirring and aging, crystallizing under a dynamic hydrothermal condition, and then separating, washing and drying to obtain the KL molecular sieve. Compared with other synthesis methods of the KL molecular sieve, the preparation method provided by the invention does not need to add an organic alcohol, seed crystal or metal ion structure directing agent, only needs to modulate the alkalinity and the silica-alumina ratio of the system, is simple, adopts dynamic synthesis conditions, and is easy for industrial amplification and large-scale batch production of the KL molecular sieve.

The invention relates to a potassium ion battery negative electrode material, a preparation method thereof and a potassium ion battery. The preparation method comprises the following steps: preparing a carbon molecular sieve raw material; and carrying out heat treatment on the carbon molecular sieve raw material to obtain the potassium ion battery negative electrode material. According to the preparation method of the potassium ion battery negative electrode material in the scheme, the pore structure of a hard carbon electrode is optimized in a heat treatment mode, so that the size of the pore is smaller than that of a potassium ion electrolyte molecule, the electrolyte molecule cannot enter the pore of the electrode material, side reaction is reduced, but potassium ions can enter the pore, therefore, the capacity of the battery can be high, and the capacity and the first coulombic efficiency of the battery are both considered.

The invention relates to a through-type mesoporous L-type molecular sieve and a preparation method thereof. The method mainly solves the problems that microporous channels cannot completely communicate with mesoporous channels when a mesoporous L-type molecular sieve is prepared in the prior art, and the mesoporous channels are easy to collapse. The method comprises the steps of adopting a secondary treatment method, impregnating a microemulsion rich in a silicon/aluminum/ an L templating agent into a mesoporous molecular sieve, and performing crystallization for two times to epitaxially growan L-type molecular sieve at the inner surface of the mesoporous molecular sieve, so as to generate the through-type mesoporous L-type molecular sieve. The method provided by the invention perfectly solves the above mentioned problems, and can be used in the industrial production of a plurality of through-type mesoporous molecular sieves.