440results about How to "Narrow pore size distribution" patented technology

A porous ceramic honeycomb filter manufactured from an oxide-based ceramic material having a pore size distribution with d₁≧7.0 microns. Preferably, the oxide-based material is cordierite or aluminum titanate. Alternatively, the filter contains a cordierite-containing ceramic body with a narrow pore size distribution with d_b≦1.00, wherein d_b=(d₉₀−d₁₀)/d₅₀. Also disclosed is a batch mixture, method and honeycomb green body made from mixture of inorganic source materials selected from the group of magnesia sources, alumina sources, and silica sources, and a pore former having a narrow particle size distribution with d_ps≦0.90, wherein d_ps={(dp₉₀−dp₁₀)/dp₅₀}. The pore former is preferably selected from a group consisting of canna starch, sago palm starch, green mung bean starch, and single-mode potato starch.

This invention relates to a mullite-aluminum titanate body having a low coefficient of thermal expansion of less than 15×10⁻⁷ C⁻¹, a high porosity of at least 38% by volume, a median pore diameter of at least 8 microns, and a narrow pore size distribution as characterized by the relation (d₅₀-d₁₀)/d₅₀ being less than 0.50 corresponding to a high degree of interconnected porosity. The inventive ceramic body also contains at least 0.10% by weight metal oxide, the metal being either yttrium, calcium, bismuth, a lanthanide metal or combinations of thereof. The inventive ceramic body is particularly useful as a wall-flow filter for diesel exhaust. A method of fabrication is provided where the sintering temperature is between 1375°-1550° C.

This invention relates to an aluminum titanate body having a narrow pore size distribution as characterized by the relation (d₅₀-d₁₀)/d₅₀ being less than 0.50 corresponding to a high degree of interconnected porosity. The body also preferably exhibits a low coefficient of thermal expansion of less than 15×10⁻⁷ C⁻¹, high porosity of at least 38% by volume, and at least 0.10% by weight metal oxide, the metal being either yttrium, calcium, bismuth, a lanthanide metal or combinations of thereof. MOR is preferably at least 450 psi. Median pore diameter is preferably at least 8 microns. The inventive ceramic body is particularly useful as a wall-flow filter for a diesel exhaust. A method of fabrication is provided where the sintering temperature is preferably between 1375°-1550° C.

A catalyst for synthesizing the intermediate oil from synthetic gas by Fischer-Tropsch reaction contains Co (5-35 Wt%), mesoporous ZrO2 as carrier (53-93), noble metal (0-2) and oxide of non-noble metal. Its preparing process includes such steps as impregnating said carrier in the aqueous solution of nitrate containing the oxide of non-noble metal or the alcohol solution of organic alkydester, and impregnating it in the equeous solution of cobalt nitrate and the nitrate (or chloride) or noble metal. It has high activity, stability, selectivity and mechanical performance.

The invention discloses hydrophilic polyethylene hollow fiber microporous membrane and preparation process thereof. Said membrane is characterized in that it mainly comprises polyethylene, amphoteric copolymer containing polyethylene oxide, and inorganic nano particles. The membrane preparing process is carried out based on thermally induced phpase separation and surface segregation principles, comprising the steps of (1) preparing membrane blank by fusion and blending of amphoteric copolymer containing polyethylene oxide, diluent, and inorganic nano particles; (2) preparing hollow fiber membrane precursor by hollow process spinning of membrane blank in molten state; (3) extracting diluent in hollow fiber membrane precursor by using organic solvent to obtain said hydrophilic polyethylene hollow fiber microporous membrane, wherein the porosity of said membrane is between 40% and 80%, and average pore diameter is between 0.1mum and 5.0mum. The microporous membrane in the invention has the characteristics of high hydrophilicity, narrow pore size distribution, high strength, and good chemical stability, and serves as micro-filtration and ultra-filtration membrane material with high performance, low cost, pollution resistance, and long serve life for water treatment.

The invention discloses a method for preparing a carbon molecular sieve adsorbent. The steps are as follows: (1) solidification: polymer is used as a raw material and is arranged in a thermostatic drying oven to be solidified; (2) dry distillation: the solidified macromoleclar polymer is pulverized by a pulverizer and then is processed by dry distillation; (3) fine pulverization: the macromoleclar polymer which is pulverized and processed by dry distillation is further processed by fine pulverization in the premise that the particle diameter of the macromoleclar polymer does not meet the requirement, and ball milling or gas milling is used for preparing micro-particles; (4) molding: the macromoleclar polymer which is processed by fine pulverization is mixed and uniformly stirred with agglomerant by mass ratio, and the mixture obtained is pressed and molded by an oil hydraulic press and then is dried; (5) carbonization and activation: under the state of N2 protection, temperature is raised for carbonization so as to increase the CMS surface area; and (6) carbon precipitation and hole adjustment: the hole adjustment agent is decomposed in the carbon molecular sieve for carbon deposition, the particle diameter is shortened and is enabled to be uniform, and the carbon molecular sieve product can be obtained after cooling. The carbon molecular sieve has the advantages of high CH4 adsorbing capacity, high selectivity factor of adsorption, favorable strength, low cost and no pollution, and the performance achieves or surpasses the standard of a sample of Japan carbon molecular sieve.

The invention discloses a preparation method for an ordered mesoporous carbon/tungsten carbide composite material and a supported catalyst thereof. In the method, an organic matter and a tungsten salt are separately used as a carbon source and a tungsten source, and the carbon source and the tungsten source are mixed with a surfactant; and a precursor of the ordered mesoporous carbon/tungsten carbide is synthesized by a solvent-evaporation induced self-assembly method, and then the precursor is subject to high-temperature treatment in the inert atmosphere to form the ordered mesoporous carbon/tungsten carbide composite material. The ordered mesoporous carbon/tungsten carbide composite material prepared by the method has the characteristics of high degree of order, narrow aperture distribution, large specific surface area (greater than 500 m<2>/g) and the like. The invention further comprises a supported catalyst prepared by supporting active components on the ordered mesoporous carbon /tungsten carbide composite material which is prepared by the method; and because of the synergistic effect and the structure effect of the ordered mesoporous carbon/tungsten carbide composite material, the catalyst has higher methanol electro-oxidation catalytic activity than a commercial carbon platinum-ruthenium catalyst.

The invention discloses a method for preparing ZrO2 aerogel. The method sequentially comprises the following steps of: (1) dissolving a zirconium inorganic salt into an alcohol aqueous solvent, then sequentially adding a chelating agent, a drying control chemical additive and an epoxide and stirring for mixing; (2) carrying out a water bath on the obtained sol; (3) sequentially ageing, cleaning and soaking the sol subjected to the water bath; (4) drying the substance obtained in the step (3); and (5) carrying out heat treatment on the substance obtained in the step (4) at 400-700 DEG C for 3-8 hours to obtain the ZrO2 aerogel. In the invention, the specific surface area of the prepared ZrO2 aerogel is 400-800m<2>/g, the density is 100-500kg.m<-3>, the pore size distribution is narrow, and the ZrO2 aerogel is a nano scale. The ZrO2 aerogel has uniform and stable structure and can be widely applied to the fields of heat insulation, catalysis, environmental protection, and the like.

The invention relates to a method for preparing a high-hydrophobicity microporous membrane. A polymer and a membrane-making diluent membrane liquid are uniformly mixed and then are coated on a solid template on the surface of a micro structure by virtue of a thermally induced phase separation method under assistance of a solid template; the microporous membrane is prepared by the thermally induced phase separation method; and under the synergistic effect of the template and phase separation, the hydrophobicity of the membrane surface and other membrane properties are improved. The microporous membrane is high in hydrophobicity; a water contact angle is up to 165 degrees at most, and a rolling angle is 3 degrees, so that the ultra-high hydrophobicity is reflected; the permeation performance is high; the nitrogen flux under the 0.1MPa membrane penetration pressure difference is more than or equal to 260 m<3>/(m<2>.h); an aperture distribution range is small; the maximum aperture is less than or equal to 0.5 microns; the mechanical performance is high; the tensile strength is more than or equal to 3.0 MPa; and the breakage elongation is more than or equal to 68 percent.

The present invention belongs to the preparation field of micropore carbon material, and relates to the preparation method for micropore carbon material with high specific surface area and narrow pore distribution by biomass. The biomass is cleaned and cut into subparagraph with a length of 1~3 centimeter, and then is subjected to carbonizing at 300~500 DEG C for 3~4 hours in the presence of inert atmosphere. The obtained carbonizing product is immerged into an alkaline solution for 20~24 hours until the carbonizing product is totally wetting, and then the carbonizing product is separated from the solution and is activated for 1.5~3 hours at 700~800 DEG C in the presence of inert atmosphere, and then is scrubbed by water until the pH value of the scrub solution is 7~8, and then the carbonizing product is immerged into a diluted acid solution for 4~5 hours and is scrubbed by water until the pH value of the scrub solution is 6~7, finally, the carbonizing product is dried at 80~120 DEG C to obtain micropore carbon material. The preparation method for the present invention has the advantages of that the preparation process is simple, the raw material is cheap and abundant, the preparation condition is free from zone limit; besides, the preparation method is adapted to industrial production.

The invention relates to a methjod for preparing activated charcoal with high specific surface area by using petroleum tar. It comprises following steps: disintegrating petroleum tar into grits # 80; immersing raw material into oxide medium for complete contact, oxidizing; mixing with alkali, activating in inert atmosphere, washing and getting said product. The specific surface area of got product is over 2000 m2/g, the micropore volume is 1.2-2.1 cm3/g, bore diameter is about 1 nm, the adsorbility is good, the alkali consumption is greatly reduced compared with current technology, the activating temperature is low and ratio of performance and cost is high.

The invention relates to a method for preparing titanium dioxide mesoporous material which consists of, using segmented copolymer as mold plate, employing sol gel method to obtain large-hole diameter, high thermal stability and high optical catalytic activity rare earth doped titanium dioxide mesoporous material. The doped rare-earth salts can substantially improve the thermal stability and optical catalytic activity for the titanium dioxide mesoporous material.

The invention relates to the technical field of porous ceramic materials and film separation, in particular to a low-temperature sintering acid and alkali resistant porous silicon carbide ceramic filmand a preparation method thereof. The method sequentially comprises the following steps of (1) support body manufacturing; (2) transition layer processing; (3) filtering layer processing; (4) film sintering process. The method provided by the invention has the characteristics that the sintering temperature is low; the production energy consumption is low; the process method is simple; the equipment requirements are low; the production cost and the investment cost are low; the control is flexible; the shaping is easy; the method is suitable for industrial customization and meets the scaled production. The porous silicon carbide ceramic film produced by the method has the characteristics of good hydrophilcity, great filtering flux, high porosity, high filtering precision, high mechanical intensity, good acid and alkali resistant performance and long service life.

The invention discloses a making method of narrow-aperture high-graphitizing degree middle-hole carbon, which comprises the following steps: allocating metal compound and carbon primer with weight rate at 0.1-6:1; dissolving metal compound in the solution with carbon primer; stripping solvent; solidifying in the air for 0.1-20h under 80-400 deg.c; charring for 0.1-3h under inert gas at 500-1200 deg.c; proceeding acid washing until the metal element is not detected; obtaining the product.

The present invention relates to a preparation method of polyolefine microporous membrane. Said invention adopts thermal phase separation process to prepare said polyolefine microporous membrane, said process includes the following steps: mixing polyolefine compound and first solvent, melting them by using extruder, extruding melt, cooling and forming to obtain a colloidal material, making said colloidal material undergo the processes of supercritical extraction, thermal stretching and setting so as to obtain the invented product.

The invention discloses a preparation method for ordered mesoporous gamma-Al2O3. The preparation method comprises the steps of a synthesis reaction, aging, drying and calcining so as to obtain the ordered mesoporous gamma-Al2O3. The method provided in the invention is simple and easily practicable, is safe to operate and is easy for industrial production; the obtained gamma-Al2O3 has the advantages of a large specific surface and high thermostability.

The invention relates to a microporous and mesoporous organometallic compound as well as the preparation method thereof, and mainly provides an organometallic compound with multilevel pores, as well as the preparation method thereof. The preparation method comprises the following steps: metal inorganic salts and organic carboxylic acid coordination polymers are dissolved in water or an organic solvent; the mixed solution is crystallized for 10-100 hours under the condition that the temperature is 100-220 DEG C; after being naturally cooled down and taken out, the reaction product is taken out; the microporous and mesoporous organo-metallic compound is prepared through suction-filtering, washing, drying and baking. The preparation process of the invention is simple, the cost is low, and the microporous and mesoporous organo-metallic compound can be prepared under mild conditions. The prepared material with the multilevel pores has wide application prospect on aspects of adsorption, separation, catalysis, etc.

The invention discloses a polyester flat microporous membrane and a preparation method thereof. The microporous membrane comprises the following materials in percentage by mass: 60-99.9% of polyester and 0.1-40% of modifier; or 20-40% of non-woven fabric, 60-79.9% of polyester and 0.1-30% of modifier. The preparation method is realized on the basis of a thermally induced phase separation process and comprises the following steps: mixing the polyester, the modifier and diluter into a homogeneous solution at high temperature; scraping the homogeneous solution into a liquid membrane, cooling andcuring into a membrane so as to form a precursor membrane subject to microphase separation, and extracting to obtain a flat microporous membrane. The prepared polyester flat microporous membrane is in a spongeous structure with the pore diameter of 0.05-5.0 micrometers and the porosity of 30-80%, and has the advantages of narrow pore diameter distribution, uniform pore size, easily controlled pore size, high strength, symmetrical structure and the like, thereby being a filter membrane material for water treatment and a lithium ion battery diaphragm material with high performance, low cost andlong life.