123results about How to "Large average pore size" patented technology

The present invention relates to biomedical implants for bone substitution and replacement applications. The implant includes a strong, porous polymeric or thermoplastic compositions and growth-enhancing compositions.

A honeycomb structure 10 of the present invention is provided with porous partition walls 12 made of a ceramic material containing cordierite as a main crystal phase and separating and forming a plurality of cells 14 functioning as fluid passages. The partition walls 12 contain sodium at 0.08 to 0.15 mass % in terms of sodium oxide. A honeycomb structure having a large average pore size can be provided.

The invention discloses a dip-coated barium-tungsten cathode for traveling-wave tubes and a preparation method thereof. The dip-coated barium-tungsten cathode comprises a cathode drum, a cathode spongy body positioned inside the cathode drum. The invention is characterized in that the cathode spongy body is laminated by a tungsten spongy body and a tungsten-rhenium spongy body, wherein the tungsten-rhenium spongy body is coated with a noble metal film on the surface. With the above structure and preparation method, compared with the prior art, the cathode spongy body is a two-layered cathode spongy body laminated by the tungsten spongy body and the tungsten-rhenium spongy body, to replace the single-layer alloy substrate with uniform porosity in the prior art; the consumption of the noble metal Re is reduced; the porosity of the tungsten spongy body is increased; the storage level of cathode salts is increased; and the preferable proportion of the cathode salts allows both the emission behavior and the stability of salts better. With the noble metal Re coating, the cost of target materials is reduced. The consumption of noble metal is greatly reduced while ensuring the maximal emission and long service life of alloy substrate film-coated cathodes. The storage quantity of cathode salts is increased and the service life of cathode is prolonged.

The invention relates to a super-porous polysaccharide microsphere product and a preparation method thereof. The mean grain size of the microsphere is 1-500 microns and the mean bore diameter of the microsphere is controllable within a range of 90-800 nm. The preparation method of the super-porous polysaccharide microsphere comprises the following steps of: adding a high-content water-soluble surfactant to a water phase; dispersing the water-phase containing the surfactant to an oil phase to obtain large ports through oil-absorption swelling action of a micelle formed by the surfactant; and preparing the super-porous microsphere through crosslinking and curing of the larger pores. The product can be used as a separating and purifying medium, an immobilized enzyme carrier, a catalyst carrier or a high-efficiency adsorbent and is particularly suitable for being used as a separating medium for biological macromolecules.

A pretreatment method for increasing the average pore size of a catalyst support is disclosed which increases the diffusivity and effectiveness factor η. The pretreatment method includes calcining the support in moisturized air at an elevated temperature sufficient to increase the average pore size. In some embodiments, the support may be treated with an acidic/basic solution prior to the calcination step. Alternatively, the calcination step may occur in a gas mixture including water/air/acidic (or basic) gases.

A hydrated alumina containing metal elements and the preparation method is provided. The alumina after being roasted contains 50-99 percent by weight of alumina and one species or a plurality of species of metal oxide selected from Cu, Fe, V, Cr, Mn, Zr, Zn, Co, Ti and Mo, wherein firstly, the content of the Cu, Fe, V, Cr, Mn and Zr is 0.5-50 percent; secondly, the content of the Zn, Co, Ti and Mo is 10- 50 percent. The catalyst adopting the hydrated alumina preparation provided by the present invention has higher heavy oil conversion capability and lower gasoline sulfur content.

The present invention relates to a nickel base catalyst, wherein problems of low nickel content and low active specific surface in the prior art are mainly solved with the present invention. The technical scheme comprises that the catalyst comprises the following components, by weight: a) 20-75 parts of metal nickel, and b) 25-80 parts of a composite oxide carrier comprising 20-40 parts by weight of aluminum oxide and 5-40% by weight of silicon oxide, wherein a specific surface area of the catalyst is 150-400 m<2>/g, a pore volume is 0.3-0.8 ml/g, and an average pore size is 5-15 nm. With the technical scheme, the problems in the prior art are well solved, and the catalyst can be widely used for industrial production of hydrotreating of light oil fractions, heavy oil fractions, unsaturated greases, cracking gasoline, and especially cracking C9 and hydrocarbons with a carbon atom number of more than 9.

The invention discloses a garbage penetrating fluid efficient wastewater treating agent based on modified fly ash and a preparation method. The composition is prepared from, by weight, 50-60 parts of fly ash fine powder, 8-10 parts of dicarbonate, 11-17 parts of poly dimethyl diallyl ammonium chloride, 9-10 parts of cation polyacrylamide, 10-20 parts of carboxymethyl chitosan, 10-20 parts of quaternary ammonium salt of chitosan, 20-24 parts of smectite powder, 6-10 parts of biological bacterial sludges, 12-15 parts of magnetic tourmaline powder, 8-10 parts of basic aluminum chloride, 40-50 parts of loofahs and an adequate amount of ethyl alcohol, deionized water and water. According to the garbage penetrating fluid efficient wastewater treating agent based on the modified fly ash and the preparation method, pretreatment is conducted on coal ash powder through the dicarbonate, the porosity and the specific surface area of the coal ash power are increased, further compound modification is conducted on activation compound powder, the adsorption efficiency is increased, and the garbage penetrating fluid efficient wastewater treating agent based on the modified fly ash and the preparation method have the advantages that the adsorbent of the coal ash powder is high in capacity and easy to separate and recycle.

The invention discloses a preparation method of a bi-metal cyanide catalyst, which comprises the following steps: under the condition of stirring, respectively preparing water soluble metal salts and water soluble metal cyanide salts into a reverse microemulsion; under the condition of stirring, dropwise adding and mixing the two reverse microemulsions so as to generate a precipitate; and separating the precipitate, cleaning the obtained product by using an aqueous solution of an organic solvent, and drying the obtained product so as to obtain the bi-metal cyanide catalyst. The catalyst prepared by using the method disclosed by the invention has the advantages that the yield is high, the average aperture is large, a multistage porous structure with certain middle holes and large holes is formed, and in a reaction process of synthesizing poly (propylene carbonate) polyols through catalytic copolymerization of carbon dioxide and propylene oxide, the improvement of the mass transfer of reactants and reaction products on the surface of the catalyst and the heat transfer in a process of high exothermic reaction is facilitated.

The invention discloses a preparation method for an adsorption catalyst for removing indoor formaldehyde. The method comprises the following steps that zeolite powder is added into a thick salpeter solution for even stirring, hydrogen peroxide is added for stirring, and then filtering is performed to obtain a first material; the first material is added into a sucrose solution for even stirring and standing, sintering is performed after filtering, and smashing is performed to obtain a second material; manganese nitrate and cerium nitrate are added into water to be dissolved thoroughly to obtain a mixed solution, the second material is added into the mixed solution for even stirring, sintering is performed after standing is performed, the material is taken out, smashed and put into an ammonium chloride solution for stirring and standing, and then drying is performed to obtain the adsorption catalyst for removing indoor formaldehyde. The preparation method is simple, raw materials are easy to obtain, the obtained adsorption catalyst for removing indoor formaldehyde is high in formaldehyde adsorption capacity, the formaldehyde can be oxidized and degraded while being adsorbed, and the formaldehyde removal effect is good.

The invention discloses a preparation method of a carbon-aluminum composite material. Cheap aluminum smelting waste residues are used as an aluminum source, wood waste is used as a carbon source, a physical activation method and a chemical activation method are combined, in the pyrolysis process, the aluminum source and the carbon source form a co-melt, and a safe and green carbon-aluminum composite material is obtained. In the forming process of the carbon-aluminum composite material, the aromatic hydrocarbon polymerization degree in the carbon-aluminum composite material is increased, the physical and chemical microstructure of the carbon-aluminum composite material is improved, the adsorption performance of the cheap carbon-aluminum composite material is improved, and energy regeneration and reduction of wood waste and harmless and recycling utilization of aluminum smelting waste residues are achieved.

A friction material comprises a base and a porous friction generating layer penetrating into and integral with the base. The base presents a bonding surface. The porous friction generating layer presents a friction generating surface facing opposite the bonding surface of the base. The porous friction generating layer comprises fibers and friction adjusting particles, and about 30 to about 95% of a total surface area of the fibers is in contact with the friction adjusting particles. A curable resin is dispersed throughout the porous friction generating layer and the base.

The present invention relates to a methanol-to-aromatic hydrocarbon catalyst and uses thereof. A purpose of the present invention is mainly to solve the problems of low selectivity and poor catalyst stability in the conversion of methanol into aromatic hydrocarbons in the prior art. The technical scheme of the present invention comprises that a modified mesoporous and microporous compounded molecular sieve is adopted as a catalyst, methanol is adopted as a raw material, and the raw material is subjected to an aromatization reaction at a reaction temperature of 360-500 DEG C under a reaction pressure of 0-1.0 MPa at a raw material mass space velocity of 0.4-8 h<-1> under the effect of the catalyst. With the technical scheme, the problems in the prior art are well solved. The catalyst of the present invention can be used for the industrial production of methanol-to-aromatic hydrocarbon.

The present invention provides a novel hydroxide lanthanum-modified hydroxyapatite material and a preparation method and application thereof. The preparation method comprises the following steps of dissolving lanthanum chloride or lanthanum oxide into an acid solution, adding hydroxyapatite, and adjusting the pH (potential of hydrogen) value of the mixed solution to the alkaline property by an alkaline solution; putting the mixed solution after stirring into an ultrasonic device, and treating by ultrasonic waves for a period of time; putting onto a stirrer, and continuing to stir for a certainperiod of time; sealing, aging, filtering, and drying, so as to obtain filter slag; roasting at high temperature, so as to obtain the novel hydroxide lanthanum-modified hydroxyapatite material. The novel hydroxide lanthanum-modified hydroxyapatite material has the characteristics that the particle size is controllable, the specific surface area is large, the hole size of the particle is large, and the loading is uniform; the material is applied to remove the phosphate radicals in wastewater, the removal rate of phosphate radicals reaches 97.5% or above, and the purpose of high-efficiency andhigh-load phosphor removal is realized.

The invention discloses a synthetic method of aminated mesoporous silicon dioxide for modified cyanate ester resin and belongs to the technical field of a basis material for a high frequency printing board. The method comprises the following steps: roasting; extracting; and preparing a POSS-MPS/CE composite material. The mesoporous silicon dioxide is synthesized by means of an extraction method. The aminated mesoporous silicon dioxide which is intact in mesoporous structure and relatively great in pore diameter is obtained by means of a method of grafting amino first and then dissolving a template agent. The template agent plays roles of protecting and supporting the porous structure in the whole process.

The invention relates to a nickel base catalyst preparation method, wherein technical problems of low specific surface and small average pore size in the prior art are mainly solved with the present invention. The technical scheme comprises: adopting an alumina sol as a carrier precursor, and adding a nickel salt aqueous solution or a nickel-ammonia complex to the alumina sol at a temperature of 45-80 DEG C to obtain a nickel-aluminum sol; at a temperature of 45-120 DEG C, carrying out standing aging on the nickel-aluminum sol or carrying out heating decomposition on the nickel-ammonia complex to obtain a nickel-aluminum gel; and carrying out washing, drying, forming, calcination and reduction on the obtained gel to obtain the required nickel base catalyst, wherein the gel is subjected to vacuum freeze drying after being washed, a vacuum freeze drying time is 20-40 h, and a vacuum degree is 30-100 KPa. With the technical scheme, the problems are well solved, and the preparation method can be widely used for hydrogenation industrial production.

The invention discloses preparation of an iron, cerium and manganese catalyst for eliminating low-concentration nitric oxide at normal temperature. The catalyst is formed by synthesizing oxalic acid precipitated ferric salt, ceric salt and manganic salt, with the specific surface area being 87-141 m<2>/g and the average pore size being 4.8-7.0 nm. The catalyst can be used for the normal temperature catalytic oxidation of low-concentration nitric oxide, and has higher nitric oxide elimination property. When the concentration of nitric oxide is smaller than or equal to 10 ppm, the nitric oxide elimination rate of the catalyst can reach about 100 percent, and the service life of the catalyst can keep long while maintaining the elimination rate. The preparation has the characteristics of simple preparation technology, low cost and the like.

The invention provides a control method of a plant root rot disease. The control method comprises the following specific steps: leveling soil, applying biological organic fertilizer to the soil, uniformly stirring, and then covering with a black mulching film for 7 days; selecting an excellent variety, using 4-5 parts of foliar fertilizer, 0.4-0.5 part of agricultural avermectin and 1000 parts ofwater according to the parts by weight for preparing seed soaking liquid, soaking seeds for 3-5 hours, taking out and sowing; spraying the foliar fertilizer for 5-7 times in the plant growth period, and spraying 100-200 millimeter of foliar fertilizer per mu; and applying amino acid liquid fertilizer to the roots of plants once every 15 days in the seedling stage and vigorous growth period of theplants. The control method has beneficial effects that the organic fertilizer can provide abundant nutrients to crops and promote the growth of plant roots; added beneficial bacteria can effectively inhibit the growth and reproduction of pathogenic bacteria, purify the soil and improve the soil structure; and the control method has a significant effect on the control of the root rot disease.

The invention provides a light pervious concrete sidewalk surface brick and a preparation method thereof, and belongs to the technical field of building materials. The side walk surface brick is prepared from, by mass, 20-30% of ground furnace slag, 5-10% of cement, 5-10% of coal ash, 15-30% of pottery sand, 0-10% of river sand, 2-4% of exciting agent, 3-5% of saltpetering inhibitor, 0.1-0.3% of physical foaming agent, 2-4% of chemical foaming agent, 1-3% of manganese dioxide, 2-4% of potassium carbonate, 1-3% of water reducer and 15-25% of water. The invention further provides a preparation method for the sidewalk surface brick. According to the developed light pervious concrete sidewalk surface brick, a method of staged physical and chemical collaborative foaming is firstly adopted, thephysical foaming agent is used for forming a large number of airtight air holes inside a substrate, and the continue air entraining effect of the chemical foaming agent is utilized to make adjacent air holes be communicated, therefore a large number of communicated hole gaps are formed inside concrete. The brick has better permeable performance and better water storage performance and has a wide popularization application prospect.

The invention belongs to the field of electrochemistry and energy material, and discloses a preparation method of a biomass derivative carbon material used for sodium-ion batteries. According to the preparation method, soybean is taken as a biomass source, KOH is taken as an activator, high temperature calcining is carried out so as to obtain the porous biomass derivative carbon material. Soybeanis a natural product, is abundant in sources, is high in protein content, contains a large amount of nitrogen element, and is capable of forming a natural nitrogen doped carbon material; the nitrogendoped carbon material can be used for providing Na<+> with sufficient sodium embedding vacancies, providing substantial fake capacitance in sodium-ion battery charging and discharging process, and increasing battery specific capacity; and in addition, nitrogen element doping is capable of improving material conductivity, and increasing iron transmission efficiency; KOH activation is capable of increasing porous structure specific surface area further, it is beneficial for electrolyte infiltration, and increasing of ion and electron transmission efficiency. The biomass derivative carbon material possesses the above advantages, so that when the biomass derivative carbon material is taken as a sodium ion anode material, relatively high reversible specific capacity and excellent circulation stability are achieved.

The invention discloses a closestool cover coating capable of purifying the air. The closestool cover coating comprises raw materials in parts by weight: 35-45 parts of aqueous acrylic resin, 20-30 parts of aqueous polyurethane resin, 20-30 parts of aqueous alkyd resin, 10-15 parts of modified medical stone powder, 5-9 parts of diatomite, 6-9 parts of calcinated kaolin, 2-4 parts of tourmaline powder, 1-3 parts of hexacyclic stone powder, 3-4 parts of gas-phase silicon oxide, 1-2 parts of tween-60, 2-3 parts of zinc stearate, 2-4 parts of polyethyleneglycol , 1-3 parts of methyl hydroxypropyl cellulose, 1-3 parts of a leveling agent, 0.5-2 parts of a de-foaming agent, 2-4 parts of a preservative and 2-4 parts of a drier. The closestool cover coating capable of purifying the air, disclosed by the invention, has excellent ability to absorb stink substances in a washing room, can release negative ions to realize the effect of air purification, and has excellent weather resistance stability and flexibility.