106results about "Ferrierite aluminosilicate zeolite" patented technology

A loudspeaker device (200) is presented which includes a zeolite material (100) comprising zeolite particles (102) having a silicon to aluminum mass ratio of at least 200. For an increased pore fraction of pores with a diameter in a range between 0.7 micrometer and 30 micrometer shows an increased shift of the resonance frequency down to lower frequencies has been observed.

The invention relates to a molecular sieve preparation method, aiming to provide a method for synthetizing a ZSM-35 molecular sieve by a seed crystal process. After sodium aluminate is dissolved in water, adding NaOH and stirring; after a settled solution is obtained, adding white carbon black, and stirring the mixture at room temperature until forming even sialsphere gel; then adding zeolite seed crystal RUB-37 or ZSM-35 and evenly stirring; transferring the mixture to an agitated reactor and crystallizing at the temperature of 120-150 DEG C for 3-10 days; and filtering and drying to obtain the ZSM-35 molecular sieve. The product of the invention keeps good degree of crystallization and purity and has good catalytic reaction activity. The whole production process does not use organic template agent or potassium ion and can greatly shorten crystallization time by the seed crystal process, thus reducing unnecessary loss in the production process; and meanwhile, the product has larger specific surface area. The adopted inorganic raw materials for production protect environment and have low price.

The invention provides a preparation method of a small grain ZSM-35 molecular sieve. The method comprises the following steps: uniformly mixing a silicon source, an aluminum source, an alkaline source, a template and water to obtain a colloid liquid, the molar ratios of which are as follows: SiO2/Al2O3=18.5-28.6, template/SiO2=0.81-1.25, OH<->/SiO2=0.03-0.18 and H2O/SiO2=10-26; firstly crystallizing the colloid liquid for 5-30 hours at 15-80 DEG C and then continuously crystallizing for 10-30 hours at 150-200 DEG C; and filtering, washing and drying to obtain the small grain ZSM-35 molecular sieve. According to the preparation method, by using cheap ethidene diamine as the template, the crystallizing process is controlled to synthesize the small grain ZSM-35 molecular sieve by adding seed crystals and crystallizing in two stages, so that the grain size reaches about 0.5 micron at minimum.

SCR-active molecular sieve based-catalysts are produced by combining a molecular sieve with at least one ionic iron species and at least one organic compound to form a mixture, then calcining the mixture to remove the at least one organic compound. This process improves the dispersion of the iron within the molecular sieve compared to an iron-containing molecular sieve that is not treated with an organic compound. Iron-containing ferrierite zeolites exhibit a selective catalytic reduction of nitrogen oxides with NH₃ or urea of greater than 25% conversion at 300° C. in exhaust gases prior to ageing or exposure to steam. Iron-containing beta zeolites exhibit a selective catalytic reduction of nitrogen oxides with NH₃ or urea of: (a) greater than 40% conversion at 300° C. and (b) greater than 80% conversion at 400° C., in exhaust gases after ageing for 20 hours at 700° C. in the presence of 10% H₂O.

Mesoporous compositions and methods for preparing mesoporous and/or mesostructured materials from inorganic materials are provided. Various embodiments described herein relate to the preparation of mesoporous and/or mesostructured zeolites via a dehydroxylation pretreatment followed by a mesopore introduction step.

The invention provides a green synthetic method for a rare earth-containing ZSM-35 molecular sieve, which is characterized in that silicon source, aluminum source, deionized water, salt of rare earth element, seed and inorganic acid or inorganic base are taken as initial raw materials; wherein the mol ratio of the initial raw materials comprises: SiO2: Al2O3 is 15-40, OH<->:Al2O3 is 2.5-9.2, H2O: Al2O3 is 300-2000, RE2O3: Al2O3 is 0.01-0.56, the addition of the seed accounts for 0.1-10.0% of total mass of raw material silicon aluminum oxide, a reaction initial raw material mixture is crystallized for 20-72 hours under the authigenic pressure and crystallization temperature of 150-200 DEG C, the rare earth-containing ZSM-35 molecular sieve is prepared by hydrothermal synthesis, and the invention has the advantages of simple process, friend environment, low cost and good products crystallization quality, the rare earth element is directly introduced in a molecular sieve frame during the synthesis process, so that the stability of the molecular sieve is enhanced.

The invention discloses a method for synthesizing a ZSM-35 molecular sieve, which is characterized by recovering and obtaining the ZSM-35 molecular sieve by taking n-butylamine as a template agent and kaolin as a whole aluminum source and a whole or a part of silicon source and subjecting a reaction mixture to hydrothermal crystallization at 140 to 190 DEG C, wherein in the reaction mixture, the SiO2 to Al2O3 molar ratio is between 12 and 100, the n-butylamine to SiO2 molar ratio is between 0.1 and 0.5, the Na2O to SiO2 is between 0.07 and 0.2 and the H2O to SiO2 molar ratio is between 12 and 30. The method uses cheap raw materials and can reduce production cost.

The invention belongs to the field of preparation of molecular sieves and particularly relates to a rapid synthesis method for small-crystal-grain molecular sieves and an application of the small-crystal-grain molecular sieves. The rapid synthesis of the small-crystal-grain molecular sieves is achieved through the procedures of firstly, preparing a precursor mixture, then, preparing gel and finally carrying out direct crystallization. The method is applied to the synthesis of the following molecular sieves, but not limited to: ZSM-5, ZSM-11, ZSM-22, ZSM-23, ZSM-35, SAPO-34, SAPO-11, SAPO-18, SSZ-13 and EU-1. Molecular sieve products synthesized by the method have the characteristics of small crystal grain, large specific surface area, high crystallinity and high yield. According to the method, the crystallization time can be shortened greatly, the production efficiency is increased, and the manufacturing cost of the molecular sieves is reduced.

The invention provides a preparation method of a ZSM-35 molecular sieve. The preparation method comprises the following steps of: firstly, with cyclohexane as a reaction medium and a template agent, adding a precursor compound of aluminum, a precursor compound of silicon, an alkali source, water and a homogeneous molecular sieve crystal seed with ZSM-35 into the cyclohexane by violent stirring to obtain a precursor mixer of the molecular sieve; crystallizing the precursor mixer prepared in the first step at the reaction temperature of 130-220DEG C for 10-240 hours; and thirdly, cooling the mixture crystallized in the second step to room temperature and filtering to obtain solid and carrying out vacuum drying on the obtained solid to obtain the ZSM-35 molecular sieve. According to the preparation method disclosed by the invention, after the synthesis is finished, the cyclohexane can be directly separated and recycled; and meanwhile, the washing of the molecular sieve is avoided and no waste water generates in the reaction. The preparation method is an environment-friendly production process for the molecular sieve.

SCR-active molecular-sieve based catalysts with improved low-temperature performance are made by heating a molecular-sieve in a non-oxidizing atmosphere with steam (hydrothermal treatment), or in a reducing atmosphere without steam (thermal treatment), at a temperature in the range of 600-900° C. for a time period from 5 minutes to two hours. The resulting SCR-active iron-containing molecular sieves exhibit a selective catalytic reduction of nitrogen oxides with NH₃ or urea at 250° C. that is at least 50% greater than if the iron-containing molecular-sieve were calcined at 500° C. for two hours without performing the hydrothermal or thermal treatment.

The present invention discloses a ZSM-35 molecular sieve preparation method, which comprises: A, mixing an aluminum source, a silicon source and a ZSM-35 crystal seed to obtain a mixture; B, respectively mixing the mixture with an alkali source, a templating agent, water and the ZSM-35 crystal seed to obtain a gel product; and C, carrying out crystallization on the gel product obtained in the step B to obtain the ZSM-35 molecular sieve product. According to the present invention, the preparation method is simple, the organic additive excluding the template in the preparation raw materials or the inorganic directing agent is not required to be added so as to eliminate the purification on the organic additive or the inorganic directing agent, simplify the production process, and reduces the production cost; and the small ZSM-35 molecular sieve grains with characteristics of high crystallinity degree, low grain diameter, low grain thickness and FER structure can be prepared.

The invention discloses a preparation method of a catalyst for preparing dimethyl ether by methanol. The method comprises the following steps: firstly, dissolving a template agent in strong alkaline solution, and adding microporous molecular sieves to be dipped so as to obtain mixed liquor, secondly, performing primary crystallization and cooling on the mixed liquor, adjusting the pH of the mixed liquor to be 6 to 11, performing secondary crystallization on the mixed liquor, and then filtering, washing and drying the mixed liquor so as to obtain dried solid powder, and thirdly, performing ammonium ion exchange, washing and drying on the solid powder in ammonium salt solution, and calcining to remove the template agent and NH3 so as to obtain the catalyst. The catalyst for preparing dimethyl ether by methanol disclosed by the invention is based on cellular material, adopts strong base to dissolve material to partly destroy microcellular structures, then performs hydrothermal reconstruction in the condition that quaternary ammonium salt template agent exists, so as to form mesoporous structure and obtain the hierarchical pore structure catalyst containing millipore and mesopore. According to the catalyst, the microcellular structures are kept, the activity decline of the catalyst is prevented, hollow structures are formed, products can be separated from the surface layer of the catalyst conveniently, and carbon distribution is prevented. According to the preparation method, the stability, the activity and the selectivity of the catalyst are improved.

The invention discloses a method for synthesizing a ZSM-35 molecular sieve. The method comprises the steps of firstly processing the ZSM-35 molecular sieve with an alkaline solution to prepare a structure-directing agent, stirring inorganic alkali, aluminium sources, silicon sources and water to synthesize silicon-aluminium gel, then adding the structure-directing agent and obtaining the ZSM-35 molecular sieve after hydrothermal crystallization. The method has the advantages that the ZSM-35 molecular sieve synthesized by the method has a high degree of crystallinity and effectively avoids mixed crystals; and the method is simple and easy to operate, is low and available in raw materials and avoids using toxic and harmful organic template agents.

The present invention is a method that perturbs the initial crystallization of a material from a less desired phase into a more desired phase. More specifically, the present invention is a method to form a different crystallization of a zeolite, mesoporous material, SAPO₄, AlPO₄ or porous inorganic oxide after the hydrothermal synthesis has started and a precursor crystalline phase has formed.

The invention belongs to the technical field of chemical engineering, and concretely relates to a method for synthesizing zeolite molecular sieve or SAPO molecular sieve, and an apparatus thereof. The synthesis method is characterized in that a gas-solid phase reaction of amorphous nonmetal oxide reactant dry glue in a pressure reactor is carried out in continuously flowing directing agent steam to form the zeolite molecular sieve or SAPO molecular sieve, the liquid hourly space velocity of the continuously flowing directing agent steam before vaporization is 1-50hr<-1>, the pressure in the pressure reactor is 0.1-1.5MP, and the reaction temperature is 100-200DEG C; and the directing agent steam discharged from the outlet of the reactor undergoes pressure reduction to normal pressure, and is cooled to a liquid which can be recycled. The synthesis reaction temperature and pressure, the composition of the above directing agent and the flow velocity of the steam can be adjusted, the crystallization process can be accelerated, and the obtained product has the advantages of pure phase, perfect crystal form, and small and uniform crystal grain size. The directing agent can be recycled, no waste gas or waste liquid is discharged, and realization of low-cost environmentally friendly large-scale industrial production is facilitated.

The application provides a synthetic method of FER/MOR co-crystalline zeolite. The method comprises the following steps: mixing FER seed crystal, MOR seed crystal, a silicon source, an aluminium source, water and acid or alkali so as to obtain a reaction mixture; and adjusting reaction conditions such as ratio of the seed crystals, silica-alumina ratio, pH value of the system and the like, so as to obtain two-phase co-crystalline zeolite with adjustable crystalline phase ratio. According to the method, there is no need to add any organic template during the synthetic process, reaction cost can be reduced, and possible environmental pollution is decreased. The method of the invention has a good application prospect.

Relating to molecular sieve preparation methods, the invention aims to provide a method for synthesis of a high silicon zeolite molecular sieve with universal gel. The method includes the steps of: mixing deionized water with an aluminum source evenly, then adding NaOH, adding a silicon source under stirring, performing stirring continuously until the solution forms a silica-alumina gel; adding a zeolite molecular sieve seed crystal into the silica-alumina gel, performing stirring, then placing the mixture into a reaction kettle, and carrying out pumping filtration and drying on a crystallization product, thus obtaining raw powder of the high silicon zeolite molecular sieve. The product obtained by the invention not only maintains good crystallinity and purity, but also has good catalytic reaction activity. The whole production process does not use organic template agent, also greatly shortens the crystallization time through seed crystal synthesis, thus reducing unnecessary loss in the production process. The adopted inorganic raw materials are environment-friendly and low in price. Therefore, the method provided by the invention is of important significance for the basic research of zeolite molecular sieve and application in the field of actual chemical production.

The invention provides a molecular sieve, a sound absorbing material comprising the same as well as a loudspeaker. The molecular sieve is a core-shell molecular sieve which comprises a core phase molecular sieve and a shell layer molecular sieve, wherein the average pore size of the shell layer molecular sieve is larger than that of the core phase molecular sieve; internal acting micropores can beprotected by the shell layer molecular sieve and prevented from being blocked, so that resonance frequency f0 of the molecular sieve with the same volume is reduced, the bass effect is enhanced remarkably, and performance stability is improved.

The invention provides a ZSM-35 molecular sieve and a preparation method thereof. The ZSM-35 molecular sieve is an aggregation-state ZSM-35 molecular sieve with a macroporous-mesoporous-microporous composite hierarchical pore structure. The raw materials of the preparation method do not contain organic template agents and seed crystals, the preparation method comprises the following steps: preparing a reactant gel, wherein the molar ratio of SiO2, Al2O3, Na2O, K2O, oxygen-containing acid group and H2O is (20-40):1.0:(1.5-2.0):(4.0-6.5):(1.0-4.0):(600-1200); performing aging treatment and crystallization treatment on the reactant gel in sequence, and washing and drying the obtained synthetic product. The ZSM-35 molecular sieve provided by the invention can be synthesized on the premise of not using the organic template agent and the seed crystal, in addition, due to the hierarchical pore structure, diffusion and mass transfer of materials are facilitated.

The invention relates to a ZSM-35 molecular sieve and a preparation method thereof. The method comprises: carrying out mixing gelling on a silicon source, an aluminum source, an alkali, water, an organic template agent I and an organic template agent II, carrying out hydrothermal crystallization, filtering, washing, drying, and roasting to obtain a ZSM-35 molecular sieve, wherein the ZSM-35 molecular sieve has a sheet-like structure along the c-axis direction. According to the present invention, through the synergistic action of the organic template agent I and the organic template agent II, the prepared nano-sheet-like ZSM-35 molecular sieve has characteristics of small particle size and high specific surface area, wherein the diffusion rate is obviously improved through the small particle size, such that the reactant molecules and the product molecules can rapidly enter and exit the molecular sieve pore channels so as to reduce the occurrence probability of carbon deposition, the gapbetween the molecular sieves is large, and the thickness and the particle size are small so as to prolong the regeneration cycle of the catalyst and improve the selectivity of the product.

The invention discloses a ZSM-35 molecular sieve in the form of hollow aggregation and a preparation method thereof. The ZSM-35 molecular sieve is 2-20 [mu]m, preferably 5-15 [mu]m, in size. A hollow wall is composed of ZSM-35 micro-crystal grains being 50-2000 nm, preferably 100-1000 nm. The thickness of the hollow wall is 0.5-3.0 [mu]m, preferably 0.5-2.0 [mu]m. The preparation method includes the following steps: 1) uniformly mixing an aluminum source, a silicon source, alkali, water, sodium lignin sulfonate and a template agent under the combined effect of ultrasound dispersion and physical mixing; 2) continuously aging the mixture under the combined effect of the ultrasound dispersion and the physical mixing; and 3) crystallizing the material in the step 2), and washing, drying and roasting a product to prepare the ZSM-35 molecular sieve in the form of hollow aggregation. The ZSM-35 molecular sieve has uniform particle and is strong in controllability. The structure is beneficial to mass transmission of materials. The template agent is low in cost and easy to obtain and is easy to burn away, so that the molecular sieve is less in generated emission and is low in environment pollution, and has unique application prospect in the field of butene isomerization reaction.

The invention provides a nano-sheet-like ZSM-5 molecular sieve preparation method, which comprises the following steps: 1) uniformly mixing and stirring an aluminum source, a silicon source, a seed crystal, water and a template agent, and regulating the alkalinity to form a molecular sieve synthesis mother liquor; 2) aging under a stirring condition; and 3) after aging, carrying out crystallization to obtain the nano-sheet-like ZSM-5 molecular sieve. The preparation method is simple in process and low in cost, and can synthesize nano-sheet-like ZSM-5 without a special template agent and an expensive quaternary ammonium salt template agent, and the synthesized product has obvious advantages in catalytic reactions prone to carbon deposition, and particularly has great industrial applicationpotential in the catalytic fields of benzene/ethylene alkylation, benzene alkylation, toluene alkylation and the like.