727 results about "Nitrogen adsorption" patented technology

Provided are a porous anode active material, a method of preparing the same, and an anode and a lithium battery employing the same. The porous anode active material includes fine particles of metallic substance capable of forming a lithium alloy; a crystalline carboneous substance; and a porous carboneous material coating and attaching to the fine particles of metallic substance and the crystalline carboneous substance, the porous anode active material having pores exhibiting a bimodal size distribution with two pore diameter peaks as measured by a Barrett-Joyner-Halenda (BJH) pore size distribution from a nitrogen adsorption. The porous anode active material has the pores having a bimodal size distribution, and thus may efficiently remove a stress occurring due to a difference of expansion between a carboneous material and a metallic active material during charging and discharging. Further, the anode electrode and the lithium battery comprising the anode active material have excellent charge/discharge characteristics.

The invention discloses a preparation method of chitin aerogel, comprising the following steps of: immersing a chitin solution into a coagulant, regenerating, washing to obtain chitin hydrogel; displacing water in the chitin hydrogel with an organic liquid to obtain chitin organogel; drying the chitin hydrogel or organogel to remove the liquid so as to obtain the chitin aerogel; carrying out deacetylation on the chitin hydrogel, washing to obtain chitosan hydrogel; displacing water in the chitosan hydrogel with an organic liquid to obtain chitosan organogel; drying the chitosan hydrogel or organogel to remove the liquid so as to obtain chitosan aerogel; and carrying out heat treatment on the chitin and chitosan aerogel over 150 DEG C so as to obtain carbon aerogel. Through a nitrogen adsorption-desorption test, the specific surface area of the chitin aerogel, chitosan aerogel and carbon aerogel reaches 300m<2>/g or more than 300m<2>/g.

Provided are a rubber composition for treads that has both excellent abrasion resistance and good wet grip performance and also offers good fuel economy and elongation at break, and a pneumatic tire (particularly for passenger vehicles and for sport utility vehicles) formed therefrom. The rubber composition includes, based on 100% by mass of a rubber component, 40-75% by mass of BR and 25-55% by mass of SBR; and includes, per 100 parts by mass of the rubber component, 40-120 parts by mass of a silica having a nitrogen adsorption specific surface area of 160-270 m²/g, and 15-50 parts by mass of a carbon black having a nitrogen adsorption specific surface area of 100-250 m²/g, wherein a ratio of a total content of silica to a total content of SBR is 0.70-2.50, and a ratio of a total content of carbon black to a total content of BR is 0.25-0.75.

A description is given of agglomerates of faujasite X with an Si/Al ratio of 1, the inert binder of which, on the one hand, has been converted to active zeolite by conversion to zeolite in an alkaline liquor, and which have been subjected, on the other hand, to an exhaustive lithium exchange. These adsorbents develop a nitrogen adsorption capacity (1 bar/25° C.) of at least 26 cm<3>/g, which makes them excellent adsorbents for the non-cryogenic separation of gases from air and for the purification of hydrogen.

The invention relates to a method for recovering active carbon fibre organic waste gas by taking nitrogen as desorption medium, belonging to the field of environmental protection. The method for recovering active carbon fibre organic waste gas by taking nitrogen as desorption medium takes the active carbon fibre as a fixed bed adsorber of the adsorbent, adopts thermal nitrogen desorption and can recover and reuse the organic waste gas and nitrogen at the same time. The method of the invention adopts the thermal nitrogen adsorption, generates no secondary contaminant, realizes that the exhaust reaches the standard of the environmental protection, leads the adsorption layer to keep dry at the same time, improves the utilization ratio of the active carbon fibre and prolongs the service life of the active carbon fibre. As vapour is not used for desorption, the equipment has no corrosion problem, thus greatly reducing the manufacture cost of the equipment. The method of the invention has extremely good recovery effects on solvent with large water solubility and easy hydrolysis performance and organic waste gas with high boiling point, has low water content in the recovered products, high quality of the solvent and reduces the running cost.

A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non-aqueous solvent-type secondary battery, is constituted by a carbonaceous material having a pore volume of at least 0.55 ml/g of pores having a pore diameter of at most 5 mum as measured by mercury injection method, a potassium content of at most 0.5 wt. % as measured by fluorescent X-ray analysis, and a specific surface area of at most 100 m2/g as measured by nitrogen adsorption BET method. The carbonaceous material is advantageous produced by carbonizing a carbon precursor of plant origin having a potassium content of at most 0.5 wt. % as measured by fluorescent X-ray analysis, in contact with a stream of an inert gas optionally containing a halogen gas at a temperature of 700-1500° C.

A cement mix which is suitable for cementing in subterranean formations to provide zonal isolation or for blocking or plugging an abandoned pipeline or back filling a mine shaft, tunnel or excavation contains Portland cement or a mixture of two components selected from Portland cement, fly ash, slag, silica fume, gypsum, limestone and bentonite; and diatomaceous earth, preferably having a BET nitrogen adsorption specific surface area between from about 30 to about 100 m²/g. The cement mix may further contain an alkali metasilicate and/or alkali silicate, zeolite and/or aluminum silicate, an accelerator, such as an inorganic salt, and/or an alkaline metal oxide, as well as a lightweight density modifying agent, including glass, ceramic or plastic spheres. A cementitious slurry, formulated from the cement mix, has a density less than or equal to 1500 kg/m³ and exhibits good compressive strength.

A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non-aqueous solvent secondary battery, is constituted by a carbonaceous material having a true density as measured by a butanol substitution method of at most 1.46 g/cm3, a true density as measured by a helium substitution method of at least 1.7 g/cm3, a hydrogen-to-carbon atomic ratio H/C of at most 0.15 as measured according to elementary analysis, a BET specific surface area of at most 50 m2/g as measured by nitrogen adsorption BET method, and a carbon dioxide adsorption capacity of at least 10 ml/g. The carbonaceous material is advantageously produced by carbonizing an organic material originated from bamboo genera of family Gramineae, particularly genus Pleioblastus or Bambusa, at 1000-1400° C. under a reduced pressure or under a flowing inert gas stream to provide an appropriate porous structure.

A fine pore formation agent for a porous resin film is provided which comprises inorganic particles satisfying (a) 0.1≦D50≦1.5 (μm) (D50: average particle diameter of particles in 50% cumulative total by weight from the larger particle side by micro-track FRA), (b) Da≦20 (μm) (Da: maximum particle diameter by micro-track FRA), (c) 3≦Sw≦60 (m²/g) (Sw: BET specific surface area measured by nitrogen adsorption method), (d) Ir≦1.0×10⁵ (Ω·cm) (Ir: volume resistivity (Ω·cm).

The fine pore formation agent for a porous resin film is capable of providing a resin composition giving a porous resin film useful in uses for electric parts such as capacitors and battery separators.

A paste for negative plate of lead acid battery is disclosed that has a reduced paste density, yet provides a negative plate with substantially increased BET surface area and consequently the battery with enhanced performance. The disclosed paste comprises an activated carbon additive having a mesopore volume of greater than about 0.1 cm³/g and a mesopore size range of about 20 angstroms to about 320 angstroms as determined by DFT nitrogen adsorption isotherm. The cured negative plate made of the disclosed paste has a BET surface area of about 9 m²/g and 19 m²/g when the carbon loading level of the paste is about 1% and 2% weight, respectively relative to dry paste lead oxide. The battery including the negative plate made of the disclosed paste maintains the performance such as charge capacity and cycle life, despite containing less lead.

The invention discloses a method for determining contribution of pores with different apertures in a shale reservoir stratum to porosity, and belongs to the technical field of petroleum, geology and mining exploration and development. The method comprises the following steps: selecting three groups of parallel samples from shale reservoir stratum samples at the same depth; carrying out a low-temperature nitrogen adsorption-desorption experiment on the first group of samples to determine contribution of the pores with aperture ranging from 0.4-100 nm to the porosity; carrying out argon ion polishing and electron scanning microscope examination on the second group of samples to determine the contribution of the pores with aperture ranging from 50 nm to 3 microns to the porosity; carrying out mercury intrusion analysis on the third group of samples to determine the contribution of the pores with aperture greater than 1000 nm to the porosity; synthesizing the analytic data of the three groups of parallel samples, and obtaining the determination results of contribution of the pores with different apertures in the shale reservoir stratum to the porosity. The method can determine the contribution of the pores with different apertures in the shale reservoir stratum to the porosity, and overcomes the defect of the conventional gas adsorption method and the mercury intrusion method for determining the contribution of the pores with different apertures in the shale reservoir stratum to the porosity.

The invention discloses a method for preparing an aerobiotic nitrifier immobilizing vector, and belongs to the field of water treatment. The method comprises the steps of: firstly, carrying out acid washing on thermally modified attapulgite; adsorbing the nitrifier using the nanometer grade attapulgite; carrying out rapid inclusion by using the mixture gel of polyvinyl alcohol (PVA) and sodium alginate (SA); dropping the mixture into a crosslinking agent to soak for 24 hours using a granulator to obtain an immobilized nitrifier pellet; and finally, repeatedly washing the immobilized nitrifier pellet for three times using normal saline to obtain a vector particle. By taking advantage of pretty large specific surface area and pretty strong adsorption performance of the modified attapulgite, an adsorption vector which is conductive to the growth and reproduction of the aerobiotic nitrifier is prepared; the modified attapulgite is capable of ammonia and nitrogen adsorption, and can increase the ammonia and nitrogen removal rate in water; the carrier particle composited from the modified attapulgite and a macromolecular material can improve the activity and ammonia and nitrogen removal capacity of denitrification microorganisms; and the repeated use rate of the carrier is high.

The invention discloses a shale gas reservoir pore structure quantitative calculation method based on nuclear magnetic resonance. The shale gas reservoir pore structure quantitative calculation methodcomprises the following steps: collecting cores; drilling parallel samples, carrying out oil and water self-adsorption nuclear magnetic resonance experiment measurement; contrastively analyzing the difference of a parallel sample oil and water nuclear magnetic resonance T2 spectrum, and determining the distribution of different wetting pore types on the nuclear magnetic resonance T2 spectrum; obtaining a shale gas reservoir full-pore distribution curve according to high-pressure pressurized mercury, nitrogen adsorption and carbon dioxide adsorption; furthermore, obtaining an intersection plate of pore diameters and corresponding T2 time; and according to the intersection plate of different pore types of pore diameters and corresponding T2 time, establishing a quantitative calculation model of the pore diameters according to the pore types. The method has the advantages that a shale gas reservoir pore full-pore distribution curve can be quantitatively calculated through the technology;simultaneously, the nuclear magnetism measurement is quick, simple and loss-free, and is higher in practicability by compared with high-pressure pressurized mercury, nitrogen adsorption and carbon dioxide adsorption; and compared with a conventional method, the calculation result is more accurate.

Hydrocracking catalyst composition comprising an optional metal hydrogenation component supported on a carrier comprising a zeolite of the faujasite structure having a unit cell size in the range of from 24.10 to 24.40 Å, a bulk silica to alumina ratio (SAR) above about 12, and a surface area of at least about 850 m²/g as measured by the BET method and ATSM D4365-95 with nitrogen adsorption at a p/po value of 0.03.

The invention belongs to the technical field of building materials, and in particular relates to a phosphorus slag powder doped dry powdered anti-crack mortar. The phosphorus slag powder doped dry powdered anti-crack mortar is prepared from ordinary Portland cement, river sand, phosphorus slag powder, slag powder, slag powder activity excitant, cellulose ether, polypropylene fiber, wood fiber, modified attapulgite, a defoaming agent and a water reducing agent. In the invention, the average particle size of the phosphorus slag powder is 30-40 nu m, the specific surface area measured by nitrogen adsorption is 350-400 m<2>/kg, and the mass coefficient K is 1.3-1.4, therefore, the anti-crack mortar has a certain potential volcanic ash activity; the dry powdered anti-crack mortar disclosed by the invention is convenient to operate and easy to control, can be used just after being added with water and stirred on the scene, and has the characteristics of good fluidity, good water retention, high bonding strength, good waterproof and water impermeable effects, strong crack resistance, and the like. A product of the anti-crack mortar disclosed by the invention both can be applied to the bonding and plastering of polystyrene foam boards for external wall insulation and extruded sheets, and also can be applied to occasions such as the repair of easily cracked parts, the refurbishment of ceramic tiles for old walls, and the like. According to the invention, phosphorus slag powder can be effectively used, the added value of phosphorus slag powder can be improved, and social and environmental benefits can be improved; the production cost of the anti-crack mortar can be lowered, and the economic benefit can be improved.

The invention provides an SAPO-34 molecular sieve and a synthesis method thereof. A hysteresis loop is arranged between nitrogen adsorption isotherm and desorption isotherm of the molecular sieve; and a molecular sieve crystal comprises topographies such as hollow shells, holes, concave-convex, cracks, nuclear shells and the like. The molecular sieve is obtained by mixing an aluminum source, a phosphorous source, a silicon source and an organic template agent to form gel and hydrothermally crystallizing the gel for 4 to 500 hours at the temperature of between 100 and 250 DEG C, wherein the organic template agent is added in two steps, one part is added during forming the gel, and the rest is added during hydrothermal crystallization. The molecular sieve is a catalyst of active components, can be used for conversion reaction of oxygenated organic compounds, and also can be used for conversion reaction of hydrocarbons, or used as a hydrogen conversion catalyst of hydrocarbons after supporting metals.

The invention relates to a magnesium-based metal organic framework material for methane-nitrogen adsorption separation and a preparation method. The metal organic framework material is formed by coordination of at least one metal compound with at least one organic ligand to generate a framework material; the metal ions in the metal compound comprise one or more than one of Mg (II), Ni (II), Cu (II), Zn (II), Co (II), and Ca (II), and at least one metal ion is Mg (II); the organic ligand is a monodentate or polydentate organic compound of carboxylic acid or its derivatives. The invention also relates to an application of the porous magnesium-based organic framework material in methane-nitrogen adsorption separation.

This invention relates to a liquid composition adapted to be applied to a recording medium with ink containing a multi-color to form a colored section on the recording medium. The liquid composition contains fine particles reactive relative to the solvent and the coloring material in ink. When processed in particular steps, it produces aggregates of fine particles showing a specific surface area between 70 and 250 m²/g as determined by the BET nitrogen adsorption/desorption method.

A carbon material for catalyst support use which, when used as a catalyst support, maintains a high porosity while being stable chemically, having electrical conductivity, being excellent in durability, and being excellent in diffusibility of the reaction starting materials and reaction products is provided. It is characterized by comprising dendritic carbon mesoporous structures which have 3D structures of branched carbon-containing rod shapes or carbon-containing ring shapes, having a pore size of 1 to 20 nm and a cumulative pore volume of 0.2 to 1.5 cc/g found by analyzing a nitrogen adsorption isotherm by the Dollimore-Heal method, and having a powder X-ray diffraction spectrum which has a peak corresponding to a 002 diffraction line of graphite between diffraction angles (2θ: degrees) of 20 to 30 degrees and has a peak with a half value width of 0.1 degree to 1.0 degree at 25.5 to 26.5 degrees.

A nanoporous inorganic material with high three-dimensional regularity having a large number of fine pores having a nanometer-order size in an inorganic skeleton structure, which has a pore size of 0.5 to 5 nm at a peak of a pore size distribution determined from a nitrogen adsorption isotherm, and a half-width of 1 (2θ/degree) or less in an X-ray diffraction peak of a (100) plane.