206results about How to "Improved pore size distribution" patented technology

A micro/ultrafiltering element (10) and method for making a filter element are provided. The filtering element comprises a multi-level support (26) having a filtering membrane layer (12) formed thereon comprising sintered particles (14) of uniform diameter. The filtering membrane preferably has an average pore size of from about 0.005-10 micrometers. The filter element is capable of being formed in a variety of geometrical shapes based on the shape of the porous support,

The invention discloses a preparation method of a high-specific-surface-area porous nitrogen-doped graphitizing carbon nanomaterial, relating to a preparation method of a carbon material and aiming at solving the problems of small specific surface area, low nitrogen content, low productivity, poor graphitizing degree and high cost of the nitrogen-doped graphitizing carbon nanomaterial prepared by the prior art. The preparation method comprises the steps of: I. preparing a complex; II. curing and carbonizing the complex; and III. carrying out acid leaching method treatment, and drying. Compared with an existing nitrogen-doped graphitizing carbon nanomaterial, the prepared high-specific-surface-area porous nitrogen-doped graphitizing carbon nanomaterial has the advantages that the graphitizing degree is improved, the nitrogen content is increased, and the specific surface area is obviously increased, and the high-specific-surface-area porous nitrogen-doped graphitizing carbon nanomaterial has obvious pore diameter distribution. The preparation method is used for preparing the high-specific-surface-area porous nitrogen-doped graphitizing carbon nanomaterial.

A method for spherically granulating and agglomerating metal particles such as tantalum and/or niobium powders is described in the present invention, which includes the steps of: a). comminuting the metal particles to form fine particles having D50 less than 50 μm; b). granulating the comminuted metal particles comprising volatile liquid, for example, tantalum and/or niobium particles comprising volatile liquid, to form wet spherical particles; c). still drying the wet spherical particles and removing volatile liquid to form flowable pre-agglomerated particles with increased bulk density; d). heat treating the pre-agglomerated particles; e). screening the heat treated powder to obtain the flowable agglomerated particles. The present invention provides a flowable spherical agglomerated metal particles, and especially tantalum and/or niobium particles having improved properties. The present agglomerated tantalum powder have a flow rate of at least about 2.0 g/sec, a BET surface area of from about 0.2 to about 6.0 m²/g, a FSSS of at least 1.0 μm, a Scott bulk density of from about 1.2 g/cm³ to about 5.5 g/cm³. The present agglomerated niobium powder have a flow rate of at least about 1.0 g/sec, a BET surface area of from about 0.5 to about 8.0 m²/g, a FSSS of at least 1.0 μm, a Scott bulk density of from about 0.7 g/cm³ to about 3.5 g/cm³. Said tantalum and/or niobium metal particles have improved pore size distribution of the sintered anodes and increased pellet crush strength. The present invention further provides an electrolytic capacitor anodes made from the tantalum and/or niobium particles according to the present invention having a capacitance of from about 5,000 μFV/g to about 300,000 μFV/g.

The present invention provides a battery positive electrode and a preparation method thereof, and a lithium ion secondary battery. The positive electrode comprises a conductive substrate and a material layer coated on the conductive substrate surface, wherein the material layer comprises a first conductive material layer attached on the conductive substrate, a first active material layer attached on the first conductive material layer, a second conductive material layer attached on the first active material layer, and a second active material layer attached on the second conductive material layer, and the compact density of the second active material layer is lower than the compact density of the first active material layer. According to the present invention, characteristics of excellent pore size distribution, good electrolyte infiltration and material shedding resistance are provided, and the prepared battery has characteristics of good cycle performance, low internal resistance, excellent rate capability, excellent high temperature storage performance and high energy density.

A method for making the microporous carbon with modified pore size distribution and advanced sorption behaviour. The carbon is derived from metal or metalloid carbides. The method employs the use of oxidant in reaction medium that during the carbide conversion into carbon widens small micropores, which otherwise would be hardly accessed by sorbing molecules or ions in practical applications. The microporous carbon obtained is free of impurities and possesses extremely narrow pore size distribution.

The invention discloses a method for synthesizing a porous microsphere material containing NaY zeolite by a waste FCC (fluid catalytic cracking) catalyst, which is a catalytic cracking process. The method is characterized by comprising the following steps: A. adding water and hydrochloric acid to the waste FCC catalyst for mixing slurry and acidizing to obtain catalyst microspheres; B. mixing thecatalyst microspheres with one or a combination of natural kaolin and roasted kaolin, adding water to obtain slurry containing 30-50% of solid, adding a functional agent to the slurry and then forming dried microspheres through spray drying, and roasting the dried microspheres at the temperature of 700-1100 DEG C for 0.5-10 hours to obtain roasted microspheres; and C. adding sodium silicate, a zeolite directing agent and alkali liquor to the catalyst microspheres and/or the roasted microspheres, adding the obtained mixed solution to a crystallization reaction kettle, performing hydrothermal crystallization at the temperature of 85-120 DEG C for 10-30 hours, filtering out a mother liquid, washing the obtained filter cake with deionized water, and then drying to finally obtain the finished product. The method is mainly used for synthesizing the porous microsphere material containing the NaY zeolite.

A microporous polyethylene battery separator material (212), for use in a flooded-cell type lead-acid battery, benefits from increased porosity, enhanced wettability, and exceptionally low electrical resistance when an electrolyte-soluble pore former is employed in the manufacturing process. The pore former (210) is soluble in electrolytic fluid and therefore dissolves in-situ in sulfuric acid during battery assembly. The dissolution of the pore former leaves behind additional, larger voids (220) in the separator material and thereby enhances ionic diffusion and improves battery performance.

The invention relates to the technical field of a lithium ion battery, in particular to a preparation method of a spherical hard carbon negative electrode material of a high-capacity lithium ion battery. The preparation method is characterized by comprising the following steps of (1) material mixing; (2) precrosslinked polymerization reaction; (3) crushing and grading; (4) polymer powder pelletizing treatment; (5) oxidation stability treatment; (6) pre-carbonization treatment; (7) carbonization treatment. Compared with the prior art, the preparation method has the advantages that the raw material sources are wide; the preparation process is simple; the structure and the processing performance of a precursor organic carbon source can be effectively improved through the precrosslinked polymerization reaction; the prepared spherical hard carbon has unique appearance and good pore diameter distribution, and also has the advantages of particle granularity distribution uniformity, high stacking density and the like; high capacity, high first coulombic efficiency, excellent high-rate performance and excellent circulation performance are also realized.

The present invention provides porous body precursors and shaped porous bodies. Also included are catalysts and other end-use products based upon the shaped porous bodies and thus the porous body precursors. Finally, processes for making these are provided. The porous body precursors are germanium doped and comprise a precursor alumina blend. It has now surprisingly been discovered that inclusion of germanium, alone or in combination with such a blend, in porous body precursors can provide control over, or improvements to, surface morphology, physical properties, and/or surface chemistry of shaped porous bodies based thereupon. Surprisingly and advantageously, heat treating the shaped porous bodies can result in additional morphological changes so that additional fine tuning of the shaped porous bodies is possible in subsequent steps.

A preparation method of one-dimensional metal titanate nanorods relates to a preparation method of titanate nanorods, and mainly solves the problems that a titanate photocatalyst material prepared in the prior art has a relatively small specific surface area, a relatively low roughness factor and non-uniform size and shape. The preparation method of one-dimensional metal titanate nanorods comprises the following specific steps: 1, preparing a metal salt ethylene glycol solution; 2, adding a titanium source; 3, centrifuging and eluting; 4, drying; and 5, roasting to obtain the one-dimensional metal titanate nanorods. The preparation method has the advantages as follows: 1, the specific surface area of the prepared one-dimensional metal titanate nanorod photocatalyst is 2-43 times of the surface area of the titanate nanoparticle photocatalyst material prepared in the prior art; and 2, the prepared one-dimensional metal titanate nanorod photocatalyst has an apparent pore size distribution and a relatively large roughness factor. The preparation method is mainly applied to preparation of the one-dimensional titanate nanorods.

The invention discloses a complex reservoir rock pore structure parameter extraction method. The method includes the following steps that: 1) the three-dimensional image of the core of the pore structure of a complex reservoir rock is obtained, a three-dimensional digital core is established; 2) a pore network model with maximal ball clusters adopted as units is formed through using a maximal ball algorithm based on the three-dimensional digital core; 3) sectioning processing is performed on the pore network model obtained in the step 2), and sectioned sections are recorded; 4) as for the sectioned sections obtained in the step 3), rays are emitted from the center of the core at every one preset angle, the rays extend until reaching skeleton voxelsm, and the length of each ray is calculated, a data set of pore local spatial scale is established based on the length of each ray, and the optimal segmentation threshold value of the data set of the pore local spatial scale is determined; and 5) the pore diameter distribution of the complex reservoir rock can be obtained according to the optimal segmentation threshold value obtained in the step 4). With the method of the invention adopted, the pore diameter distribution of the complex reservoir rock can be extracted accurately.

The invention discloses a nitrogen and sulfur codoped porous carbon material. The nitrogen and sulfur codoped porous carbon material is prepared by subjecting glucose, melamine, dimethyl sulfoxide andconcentrated sulfuric acid to protonation and performing operations such as heating reaction and calcined activation. According to the nitrogen and sulfur codoped porous carbon material, the range ofthe specific surface area is 1203.9-1932.1 m2 g-1, the mean pore size is uniform in distribution within a range of 1.421-3.627 nm. The preparation method of the nitrogen and sulfur codoped porous carbon material comprises 1) protonation of melamine, 2) preparation of a nitrogen and sulfur-containing precursor, 3) activation of the nitrogen and sulfur-containing precursor, and 4) aftertreatment ofthe nitrogen and sulfur-containing precursor. The invention also discloses application of the nitrogen and sulfur codoped porous carbon material as a supercapacitor electrode material, and when the electric current density is 1 A g-1, the range of the capacitance of the nitrogen and sulfur codoped porous carbon material is 180-293 F g-1. Protonation treatment of the concentrated sulfuric acid onthe melamine adjusts the electron structure of the melamine to produce the nitrogen and sulfur codoped porous carbon material high in content of nitrogen; the dimethyl sulfoxide is high in polarity and hydrophilicity and favorable to doping reaction with hydroxyl of the glucose. Therefore, the prepared nitrogen and sulfur codoped porous carbon material is excellent in electrochemical properties and has an application prospect in the field of supercapacitors.

The invention relates to the field of photocatalytic materials, and in particular relates to a preparation method of a high-specific-surface porous TiO2 nano-fiber. According to the preparation method, the nano-fiber is obtained by dissolving out SiO2-phase nano-particles in a double-phase SiO2-TiO2 electrostatically-spun nano-fiber by adopting a solvent dissolution method, wherein the solvent is one of sodium hydroxide, potassium hydroxide, barium hydroxide, calcium hydroxide, cesium hydroxide or hydrofluoric acid. The preparation method disclosed by the invention regulates the dissolution rate of SiO2 in the double-phase SiO2-TiO2 nano-fiber by means of regulating the pH value, temperature, concentration and dissolution time of the solvent so as to regulate the appearance of a microstructure of the nano-fiber. The double-phase SiO2-TiO2 nano-fiber is prepared by mixing organism precursors of titanium and silicon, adding high polymer, performing electrostatic spinning, and then roasting by adopting a roasting method. The preparation method disclosed by the invention is simple in process and low in preparation cost, the target product has high photocatalytic activity and porosity, and the pore size distribution is centralized.

The invention belongs to the technical field of adsorbents, and discloses a method for preparing multi-level pore carbon from lignin degrading bacteria-modified lotus leaves and application of the multi-level pore carbon. The method comprises the following steps of: (1) pretreating lotus leaves; (2) introducing the pretreated lotus leaves and suspension of lignin degrading bacterial spores into aliquid medium, performing oscillation at a constant temperature of 25-35 DEG C for 3-10 days for cultivation, and performing filtration, washing and drying to obtain microorganism-treated lotus leaves; and (3) performing carbonization treatment on the microorganism-treated lotus leaves at 600-1000 DEG C, and conducting activation treatment in an atmosphere of water vapor to obtain the multi-levelpore carbon. According to the method, the lotus leaves are adopted as a self-template material, so that the lotus leaves are utilized effectively; the method has a simple preparation process and low production cost, and is environmentally friendly, and compared with other activated carbon, the obtained multi-level pore carbon material has better pore size distribution, better selective adsorptionperformance and greater adsorption capacity.

The invention belongs to the technical field of preparation of porous carbon materials, and discloses a porous carbon material with a high specific surface area by virtue of fungal pretreatment as well as a method and application thereof. The method comprises the following steps: (1) drying and crushing waste biomass to obtain crushed waste biomass; 2) carrying out the constant-temperature oscillation reaction for the crushed waste biomass and fungal spore suspension in a liquid culture medium, filtering, washing, and drying to obtain a carbonization precursor; carrying out the high-temperature carbonization treatment to obtain a primary carbonized substance; and 3) activating the primary carbonized substance and an activator in inert atmosphere to obtain the porous carbon material with ahigh specific surface area. According to the invention, the porous carbon material is prepared by virtue of the regulation of fungal treatment, so that the waste biomass is effectively utilized, the preparation process is simple, the production cost is low, and the method is environment-friendly; and the obtained porous carbon material is high in specific surface area and unique in aperture distribution and capable of obtaining micro-porous, mesoporous or micro-mesoporous carbon materials. The porous carbon material is applied to the field of adsorption.

Provided is a preparation method for a mesoporous carbon material. The preparation method comprises the following steps: pore forming agents and carbon precursors are mixed uniformly and a mixture is obtained, the mixture is processed for 2-3h at the temperature of 120-160 DEG C, and mesoporous carbon precursors are obtained, and the mass ratio of the pore forming agents to the carbon precursors is 4:6-6:4; the mesoporous carbon precursors are subjected to heat treatment at the temperature of 600-900 DEG C and under protection gases, and the mesoporous carbon material is obtained after separation and purification. In the preparation method, a hard template method is employed for preparation of the mesoporous carbon material, the operation is simple, good pore size distribution is achieved, and the mesoporous carbon material facilitates high dispersion of sulfur. In addition, the strong adsorptivity of the material can inhibit dissolution and loss of polysulfides effectively, and the mesoporous carbon material is helpful to raise the utilization rate of active sulfur.

The invention relates to a production process for a spunlace composite high temperature-resisting and corrosion-resisting filtering material and belongs to the technical field of a textile filtering material. The production process comprises the following steps that: taking polyphenylene sulfide fibers and fiberglass fabrics as raw materials; checking, weighing and charging the polyphenylene sulfide fibers; charging the polyphenylene sulfide fibers into a long curtain, a horizontal opener, a big-cabin cotton blending box and a refined opener successively; and then carding by using a carding machine I and a carding machine II in a layering mode; placing into a cross lapping machine I and a cross lapping machine II to lap; clamping the fiberglass fabrics between the raw materials delivered by the cross lapping machine I and the cross lapping machine II and performing superposition; and performing the processes of pre-wetting, hydroentangling, dehydrating, drying and taking-up. The production process for the spunlace composite high temperature-resisting and corrosion-resisting filtering material provided by the invention has the advantages of excellent mechanical performance, filtration performance, high temperature-resisting performance, and chemical corrosion-resisting performance and size stability.

The invention discloses application of a ruthenium palladium/carbon catalyst. A catalyst carrier is a carbon material; active components are Ru and Pd nano particles; the loading capacity of Ru is 0.5-8.0%; the loading capacity of Pd is 0.1-2.0%; the dispersity of ruthenium palladium can be up to 30-80%. The carrier is oxidized and pretreated by acid-base, so that an oxygen-containing functional group on the surface can be increased, the property of the ruthenium palladium at the surface of the carbon material is improved, the dispersity of the ruthenium palladium is improved, and the active components are firmly adsorbed on the foundational group, so that the catalyst displays high activity in the reaction process; the prepared catalyst is applied to hydrogenation preparation of cyclohexanedimethanol (DMCD) employing dimethyl terephthalate (DMT). The activity of the catalyst after being nested for 20 times is not reduced in a 5000ml of high-pressure kettle; the DMT transformation rate is 99.3-100%; the selectivity of the DMCD is 95.5-96.4%; the DMCD purity is greater than 99.5% by simple distillation and purification. Therefore, the ruthenium palladium/carbon catalyst is mild in technological condition, simple in equipment, free of three wastes emission, low in investment, low in energy consumption, and easy in achieving industrialization.

A method for preparing a spongy porous carbon material for a supercapacitor, comprising the following steps: cleaning the rice husk with deionized water to remove dust, and then dispersing the rice husk in an HF solution, and continuously stirring in a water bath to remove the dust from the rice husk. the ash content; filter and wash to obtain deashed rice husk; mix deashed rice husk with activator according to a certain mass ratio, then add water to make it evenly mixed, and obtain a mixture of rice husk and alkali after drying; mix the mixture in Carry out high-temperature activation treatment under the protection of nitrogen atmosphere, wash with deionized water, filter and dry to obtain a porous carbon material. The sponge-like porous carbon prepared by the invention has high specific surface area, good pore size distribution, and good electrochemical performance. The preparation has mild reaction conditions, low energy consumption, simple steps and easy operation, and is suitable for large-scale industrial production.

A composite fibrous filter material for engine is prepared through adding dispersing assistant to water, ageing, adding plant fibres, inorganic fibres, and synthetic fibres, shaping with net, coating or dipping the reinforcing agent chosen from phenolic resin, epoxy resin, polyacrylic acid, and vinyl polyacetate, drying and solidifying. Its advantages are high filter accuracy and efficiency, low resistance, high physical strength and long service life.