1196 results about "Pore distribution" patented technology

The invention discloses a hydrotreating guard catalyst for residual oil and application thereof. The catalyst has the advantages of large pore volume, large aperture, high porosity, rational pore distribution, larger external orifice, high pore canal penetrability and over 36 percent of 1,000nm pore canals, and is particularly applied to a hydrotreating method of a residual oil fixed bed to ensure that precipitated metals are uniformly deposited on the whole catalyst bed and impurities, namely vanadium and calcium, can be deposited inside the pore canals so as to improve the utilization ratio of pores and maintain long-period running.

A catalyst for hydrogenated synthesis of glycollate with oxalate and a preparation method for the catalyst belong to the glycollate preparation technical field. The catalyst of the present invention uses the copper metal as the main active component, and silver as the promoter, and is manufactured with the method of immersion. A carrier of the catalyst is the modified silica sol. The select content of the copper metal is 5 to 45 percent of the carrier weight, and the optimal content of the copper metal is 10 to 40 percent. The content of silver metal is 0.1 to 15 percent of the carrier weight, and the optimal content of silver metal is 1 to 8.0 percent. The select carrier is the silica sol with a double peak pore distribution structure and the specific surface area of the carrier is 100-300m²/g; and the optimal specific surface area of the carrier is 120-240m²/g. The present invention settles the problem of applying a Cr/Cu catalyst in the oxalate gas-phase catalytic hydrogenation. Proven by experiments, the catalyst is provided with the very high reaction activity and glycollate selectivity in the reaction to synthesize glycollate with oxalate and hydrogen Moreover, the catalyst is provided with the long usable life and the stable reaction performance, and can be easily controlled.

This invention relates to a 4 group metal oxide and to a method for preparation thereof and the 4 group metal oxide prepared by adding a particle growth inhibiter to a hydrosol a hydrogel or a dried product of a hydrous 4 group metal oxide represented by MO(2-x)(OH)2x (wherein M denotes a 4 group metal and x is a number greater than 0.1 or x>0.1) followed by drying and calcining has a specific surface area of 80 m<2>/g or more, a pore volume of 0.2 ml/g or more and a pore sharpness degree of 50% or more and excellent heat stability and is useful for a catalyst or a catalyst carrier in which a catalyst metal is dispersed to a high degree. This invention further relates to a porous 4 group metal oxide and to a method for preparation thereof and the 4 group metal oxide prepared by application of a pH swing operation is characterized by a large specific surface area, excellent heat stability, high dispersion of a catalyst metal and a controlled and sharp pore distribution and is useful for a catalyst or a catalyst carrier of excellent reaction selectivity.

The catalyst consists of three parts including active component, assistant and carrier. The main active component is metal Co. The first assistant element is group IVB metal element, such as Ti and Zr or group IIIB metal element, such as La and Ce; and the second ssistant element is group VIII metal element, such as Rh, Ru and Pt. The carrier is active carbon of apricot kernel, coconut shell, oilpalm or coal; has specific surface area of 200-2000 sq mg, pore volume of 0.5-2.0 cu cm/g and pore distribution of 4-1000 angstrom. Of the catalyst weight, metal Co accounts for 4-50 %, the first assistant element 0.01-20.0% and the second assistant element 0.01-50 %. The catalyst may be used in the Fischer-Tropsch reaction of synthetic gas to prepare high-quality diesel oil as clean liquid fuel.

The invention relates to a porous carbon material and a preparation method thereof. The porous carbon material with fish scale as a raw material is prepared by using the organic and inorganic matters in fish scales as a carbon source and a natural template, and the particular method comprises the following steps: allowing dry fish scale to perform precarbonization at 300-350 DEG C; well mixing the precarbonized fish scale and an alkaline activator with a mass ratio of 1:0.5-1:3, performing activation and carbonization, performing post-treatment to remove inorganic salts, washing with deionized water to obtain a neutral solution, drying to obtain a carbon material with multilevel pore distribution. The preparation method of the invention is simple and low in cost, is applicable to industrial production; and the prepared porous carbon material is applicable to adsorption materials and super capacitors, and has a high adsorption quantity and a good specific energy rate property. The invention opens up a new way for the effective utilization of fish scale which is a waste in fishery.

The invention discloses a polyimide-base nano fibrous membrane which can be used as a lithium ion secondary battery membrane. The polyimide-base nano fibrous membrane is composed of polyimide nano fibers of which the diameters are 20-500 nanometers, the membrane thickness is 15-100 micrometers, and the air penetrability of the membrane is 10-500 seconds; and the pore distribution of the upper andlower surfaces and the inside is symmetrical and uniform, the average pore size is 100 nanometers, and the tensile strength is 100-250mpa. The invention also discloses a preparation method of the polyimide-base nano fibrous membrane. When being used as the lithium ion battery membrane, the polyimide-base nano fibrous membrane has favorable heat resistance, and can not produce the phenomenon of short circuit even at 150 DEG C; and therefore, the battery membrane disclosed by the invention is especially suitable for high-capacity and high-power lithium ion batteries.

The invention relates to a preparation method of a mesoporous X-type molecular sieve and a method for preparing an adsorbent by using the molecular sieve as an active component. The prepared adsorbent based on the mesoporous X-type molecular sieve is used as a paraxylene adsorptive separation adsorbent. The method for preparing the mesoporous X-type molecular sieve comprises the following steps: by using water glass as a silicon source and aluminum hydroxide as an aluminum source, adding a template, and carrying out hydrothermal synthesis to obtain the mesoporous X-type molecular sieve. The mesoporous molecular sieve and kaolin are proportionally molded to obtain 0.3-0.8mm granules, and the granules are subjected to barium ion or (and) potassium ion exchange until the exchange degree is greater than 99%, thereby obtaining the adsorbent which has excellent adsorptive separation capacity for paraxylene in C8 aromatic hydrocarbons. Compared with the prior art, the active component mesoporous X-type molecular sieve of the adsorbent, which is prepared by using the template, has the crystal form structure of the X-type molecular sieve and the pore distribution of the mesoporous and microporous dual models; the mesoporous pore size distribution is 2nm or so; and thus, the problem of overlow mass transfer rate in the adsorbent can be solved.

The invention relates to a method for selective hydrogenation of full-run pyrolysis gasoline, which mainly solves the technical problem in the prior art that it is difficult to selectively hydrogenate full-run pyrolysis gasoline with high colloid and free water content. The present invention adopts the pyrolysis gasoline and hydrogen of the hydrocarbon compound fraction with C5 hydrocarbon to dry point of 204 DEG C as raw materials, the reaction temperature is 30 to 80 DEG C, the reaction pressure is 2.0 to 3.0 MPa, and the fresh oil space velocity is 2.5 to 5.0 hour-1, under the condition that the hydrogen/oil volume ratio is 60-120:1, the raw material is contacted with the catalyst and reacts to convert the diolefin and alkenyl aromatic components in the raw material into monoolefin and alkylaromatic. Including alumina support, active component metal palladium or its oxide, at least one element selected from IA or IIA in the periodic table or its oxide, at least one element selected from IVA or VA in the periodic table or its oxide Oxide, the specific surface area of ​​the carrier is 40-160 m2/g, the total pore volume is 0.3-1.2 ml/g, and the carrier has a technical solution of composite pore distribution, which solves this problem well and can be used for full-run pyrolysis gasoline In the industrial production of selective hydrogenation.

The invention relates to a coating composite for a lithium ion battery separator, wherein the coating composite contains porous electro-insulated oxide particles, binding agent, foaming agent or foam stabilizing agent. The invention further relates to a foam gluing method for the lithium ion battery separator, comprising the steps: mechanically foaming and the coating suspension on the surface of a porous flexible substrate, drying, curing and roll compacting to form a film with micro pores, wherein the suspension contains the coating composite according to the invention. Adopting the coating composition according to the invention and the lithium ion battery separator prepared therefrom can achieve the purpose of small pore diameter, even pore distribution and ensuring the charging and discharging uniformity of lithium ion.

There is disclosed a porous honeycomb filter whose trapping efficiency does not drop even when a porosity fluctuates and which is capable of balancing the trapping efficiency and a pressure loss. The porous honeycomb filter is a filter whose pore distribution has been controlled. A volume of pores having a pore diameter of 15 μm or less is 0.07 cc/cc or less, and a volume of pores having a pore diameter of 40 μm or more is 0.07 cc/cc or less.

A diaphragm is selected from a composite membrane containing polyethylene terephthalate membrane as the base material. The composite membrane contains at least one organic polymer membrane consisting of polymer film-forming materials with a thermal resistant temperature of 170 DEG C to 500 DEG C and heat shrinkage of 0% to 5%. Preferably, a plasticizer is added during solution preparation to achieve more uniform pore distribution so as to obtain the composite membrane with excellent performance. The diaphragm has high temperature resistance and high safety when used for battery diaphragm. In addition, the diaphragm has good solution adsorption performance, so that the diaphragm can adsorb the electrolyte to improve the circle performance of the battery. The invention also provides the diaphragm preparation method, which is simple and convenient. Compared with the conventional battery and the battery using PET composite diaphragm with inorganic coating, the battery using the diaphragm has higher capacity, better high-rate discharge characteristics and low-temperature discharger performance, no flame and liquid leakage during high-temperature test, and excellent high-temperature safety performance.

Silica with a large pore volume, a large specific surface area, a narrow pore distribution, low contents of unwanted metal impurities, and excellent physical properties such as high heat-resistance and water-resistance is provided. The silica has a mode pore diameter (D_max) of 20 nm or less, and a solid-state Si nuclear magnetic resonance (hereinafter called solid-state Si NMR) spectrum of the silica includes a chemical shift (δ ppm) of Q⁴ peak meeting the following inequality (I).

−0.0705×(D_max)−110.36>δ  (I)

The silica with such properties can be suitably used in fields of which particularly excellent heat resistance and water resistance are required, and moreover controlled pore properties, and the fact that physical properties scarcely change over a long period of time are required among the above-mentioned applications.

An effective catalyst includes an amorphous silica-alumina support having a bimodal pore size-distribution. The support may be prepared by a method that includes the physical mixing of two silica-alumina gels prepared so as to have two different average pore sizes. The catalyst has the advantage that both metal dispersion on the support and product diffusion in the pores are optimized. Further, the catalyst has improved performance in the production of hydrocarbons from synthesis gas.

The invention discloses property-transformation alumina carrier which contains titanium and silica agent and its relative preparing method. Said silica agent is added in the sol process of aluminum hydroxide to improve the specific surface, pore diameter and pore capacity of alumina; after the sol process, individually using acid agent and alkali agent to adjust the pH value of mixed paste solution for several times to make the attained alumina with more centralized pore distribution; the titanium agent is added after the sol process and before the aging process, to improve the surface acid property, surface acid amount and B acid amount of carrier. In addition, the surface of alumina is modified by titanium to decrease the interactive condition between active metal and carrier, which can apply the diffusion of active metal components in the catalyst. The property transformation of said invention can be used as catalysis material when processing oil, especially as the catalyst carrier of hydrogenation treatment and hydrogenation transformation.

The invention discloses a method for preparing AL2O3 carrier. Said invention uses the farina as pore-expansion agent, which is added as powder after mixing other raw materials uniformly, and its added amount is 10-20wt% of alumina. Compared to present technique, said inventive alumina carrier has high strength, larger pore diameter, and centralized pore distribution, while said inventive method has simple process without special raw material and the cost of material and production are lower. The invention can be used as catalyst in the areas of oil refining, chemical industry and environmental protection, especially as the hydrogenation catalyst of heavy and residual oil.

A dual-pore distribution silica synthesis method includes that water, silicon source and template agent are mixed, and the pH value of the mixture is regulated to 4-12, the mixture is aged for 0.5-4 days at the temperature of 40-120 DEG C, and then the mixture is filtered, rinsed, dried and roasted; the template agent is the mixture of sugar and surfactant, the weight ratio of sugar and surfactant of the template agent is 0.5-2, the molar ratio of silicon and water is 1:30-1:200, the molar ratio of silicon and template agent is 1:0.005-2. The portable pore diameter of the pore with smaller pore diameter of the dual-pore distribution silicon-aluminum material is 2-10 nm, the portable pore diameter of the pore with larger pore diameter is 10-25nm, the specific area is 400-750 m2/g, and the pore volume is 0.8-1.5cm3/g. The dual-pore distribution silicon-aluminum material can be used as absorbent and catalyst, or used as the carriers of absorbent and catalyst.

The invention belongs to the fields of material science and engineering, and particularly relates to a preparation method of a gradient silicon carbide ceramic membrane for water purification. The method comprises the following steps: (1) preparing a silicon carbide ceramic support body; (2) preparing a silicon carbide intermediate layer; and (3) preparing a silicon carbide film, and finally preparing the gradient silicon carbide ceramic membrane for the water purification. The method has the beneficial effects that the prepared silicon carbide ceramic membrane material is high in communicating porosity, high in strength, high in pure water flux, and high in strong acid and alkali resistance; the pore distribution is in a gradient shape, different levels of connection surface are high in bonding strength, the method is simple and convenient to operate, and the gradient silicon carbide ceramic membrane is high in yield. According to the prepared gradient silicon carbide ceramic membrane material for water purification, the breaking strength is greater than 30MPa, the pure water flux is greater than 5m<3>/(m<2>h), and the range tolerance of the pH value is 0-14.

According to the present invention, an exhaust gas purifying catalyst is provided. The catalyst comprises a porous silica support comprising silica having a pore structure, and a perovskite-type composite metal oxide particle supported in the pore structure of the porous silica support. Further, the peak attributable to the space between silica primary particles is in the range of 3 to 100 nm in the pore distribution of the porous silica support.

The invention discloses a preparation method of a ternary positive material of a core-shell structure lithium ion battery. The preparation method comprises the following steps: (1) preparing a multi-element mixed solution of nickel salt, cobalt salt, manganese salt and aluminum salt; (2) under a protective atmosphere, adding the multi-element mixed solution, ammonia water and sodium hydroxide intoa reaction device containing a base solution, and carrying out a co-precipitation reaction to obtain an NCM hydroxide precursor; (3) introducing carbon dioxide gas so that an aluminum hydroxide coating layer is formed on the surface of the NCM precursor; and (4) filtering, washing and drying the precursor, and then adding a lithium source to carry out heat treatment so as to obtain an NCM material, wherein the surface of the NCM material is coated with aluminum oxide. The obtained precursor of a core-shell structure is uniform in pore distribution, moderate in interval and large in specific surface area. The positive material of the core-shell structure lithium ion battery is obtained through further treatment of the obtained precursor and the lithium salt, and the positive material has high charge-discharge specific capacity, long cyclic stability performance and good rate capability.