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

An in-extrudate reaction mixture to be effectively crystallized is effectively crystallized to produce zeolitic or non-zeolitic molecular sieves. The reaction mixture is heated within a slowly rotating, double-walled reactor vessel wherein a heated medium is conducted within a space formed between the double walls of the vessel. Thus, the reaction mixture is contacted by a uniformly heated wall while being gently tumbled at low speed. The tumbling action serves to uniformly distribute the heat within the reaction mixture without subjecting the mixture to such shearing that could damage shaped particles. A relatively high quantity of reaction mixture can be handled in that way to maximize the production volumes and reduce production costs.< / PTEXT>

The invention discloses Ba hetero atom-containing LTL molecular sieve and a preparation method thereof. The preparation method of the molecular sieve comprises the following steps: a barium source, inorganic base, an aluminium source, a silicon source, water and alcohol are mixed according to a mol ratio in order to obtain sol, aging and crystallization are carried out in order, obtained solid is separated, washing and drying are carried out, and after roasting, the molecular sieve is obtained. The molecular sieve is advantageous in that: 1. the synthetic method is simple, single kettle yield is high, and synthesis and operation cost are low; 2. the product has good degree of crystallization, purity, and structured morphology; 3. the Ba hetero atom-containing LTL molecular sieve is used in an aromatization reaction of normal paraffins, and can obviously improve yield of aromatic hydrocarbons, especially yield of C8 aromatic hydrocarbons, and the molecular sieve has good application prospects.

The invention relates to a method which takes kaolin as raw material and synthesizes in-situ crystal into an L zeolite molecular sieve. The method is characterized in that a part of the kaolin is calcined at high temperature to get roasting soil with high temperature, high soil is for short; the other part of the kaolin is roasted at lower temperature to get metakaolin, partial soil is for short;the two kinds of soil are mixed in a certain proportion and then is added into crystal seeds or a directing agent for the process of in-situ crystallization in an alkaline system, finally an L molecular sieve is obtained. The L molecular sieve produced by the method has the characteristic picture diffracted by X ray powder of the L molecular sieve.

The invention provides L-zeolite. Chemical composition of the L-zeolite is (0.8-5)K2O:Al2O3:(5-20)SiO2, average diameter d of the L-zeolite crystal grains is 0.1-2.0 mu m, and morphology index R is 0.2-1; in crystal grain integrity distribution, crystal grains with the morphology index R being 0.2-0.3 account for 3%-30% by mass of total quantity of the crystal grains, crystal grains with the morphology index R being 0.3-0.7 account for 40%-65% by mass of the total quantity of the crystal grains, and crystal grains with the morphology index R being 0.7-1.0 account for 10%-57% by mass of the total quantity of the crystal grains. The zeolite has higher crushing strength after being molded, and a Pt supported catalyst has higher alkane aromatization activity and selectivity and good active stability.

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 synthesis method of nano BaKL zeolite applied to aromatization of low-carbon alkane, and belongs to the technical field of zeolite preparation. The method comprises the following steps: mixing a barium source, an alkali source, an aluminum source, a silicon source and water according to a molar ratio to prepare a sol, and performing solid-state or dynamic crystallization to obtain the nano-scale BaKL zeolite. According to the invention, the BaKL zeolite with nanoscale, high crystallinity and hierarchical pore structure can be synthesized under the conditions of low silica-alumina ratio feeding and no addition of a template agent and a structure-directing agent. When the BaKL zeolite provided by the invention is used in a low-carbon alkane aromatization reaction, the yield of aromatic hydrocarbon, especially the yield of C8 aromatic hydrocarbon, can be obviously improved. Compared with a traditional method, the method is simple in preparation process, high in raw material utilization rate, low in cost and wide in application prospect.

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.

A method for synthesizing a zeolite is described. The method may include the steps of: (a) preparing an aqueous mixture comprising water, a substituted hydrocarbon, and a 1-oxa-4-azacyclohexane derivative; (b) reacting the aqueous mixture; (c) obtaining a solution comprising an organo-1-oxa-4-azoniumcyclohexane compound; (d)) forming a reaction mixture comprising reactive sources of Al, and Si, and the solution; and (e) heating the reaction mixture to form the zeolite.

This invention relates to a process for producing aluminum 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 aluminum silicates for the conversion or adsorption of hydrocarbons.

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.

The invention discloses a hierarchical pore LTL molecular sieve as well as a synthetic method and application thereof. The preparation method of the LTL molecular sieve comprises the following steps:(1) preparing a mixed aqueous solution of an aluminum source and a potassium source; (2) sequentially adding a silicon source and aqueous solution of polyethylene glycol into the mixed aqueous solution, and aging to obtain an initial sieve sol mixture; and (3) sequentially performing constant temperature crystallization and calcination on the initial sieve sol mixture, thereby obtaining the product. The synthetic method of the hierarchical pore LTL molecular sieve disclosed by the invention is simple, and the synthetic process is non-toxic and harmless. The LTL molecular sieve has a hierarchical pore structure, and mesopores of the molecular sieve are concentrated at 2-7nm; and the hierarchical pore LTL molecular sieve disclosed by the invention has excellent catalytic performance in an N-octane aromatization reaction, and compared with the traditional micro-porous LTL catalyst, the hierarchical pore LTL molecular sieve is capable of improving the aromatic yield by 20% or higher and has excellent industrial application prospects.

The invention relates to a germanium-containing L-type molecular sieve and a preparation method thereof. The chemical composition of the molecular sieve is: (0.8‑1.3)M·(0.001‑0.007)GeO 2 ·Al 2 o 3 ·(4-7)SiO2 2 , where M is K 2 O or K 2 O and Na 2 A combination of O. The L-type molecular sieve provided by the invention is used for preparing an aromatization catalyst, and has good aromatization conversion rate, target aromatic hydrocarbon yield and stability.

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 method for preparing a preformed L-type molecular sieve, comprising: (1), mixing kaolin, forming aids and water, forming, drying and roasting to obtain a preform; (2), preparing the obtained preform The body is modified, washed and dried to obtain a modified preform; (3), the modified preform, inorganic alkali, silicon source and water are mixed, and the molar ratio of each material in the resulting mixture is (1-4 ) M 2 O: Al 2 o 3 : (6‑12) SiO 2 : (100‑250)H 2 O, the mixture was subjected to hydrothermal crystallization, and the crystallized product was washed and dried. The preformed L-type molecular sieve prepared by the method of the present invention can be directly used as a carrier without remolding, avoiding the problem of difficult filtration of nano-sized molecular sieves, and is especially suitable for the industrial production of nano-scale L-type molecular sieves, and the L-type molecular sieves have high crystallinity .

The invention relates to a preparation method of a preformed L-shaped molecular sieve. The method comprises the following steps: (1) mixing kaolin, a forming assistant and water, forming, drying, androasting to obtain a preformed body; (2) performing modification treatment on the preformed body, washing, and drying to obtain a modified preformed body; and (3) mixing the modified preformed body, an inorganic alkali, a silicon source and water according to a molar ratio of (1-4)M2O:Al2O3:(6-12)SiO2:(100-250)H2O, carrying out hydrothermal crystallization on the mixture, washing the crystallizedproduct, and drying. According to the invention, the preformed L-shaped molecular sieve prepared by the method disclosed by the invention can be directly used as a carrier without forming again, so that the problem of difficult filtration of a nano-crystalline grain size molecular sieve is avoided; and the method is particularly suitable for industrial production of a nano-scale L-shaped molecularsieve, and is high in crystallinity degree of the L-shaped molecular sieve.