169 results about "Oxygen adsorption" patented technology

An air-fuel ratio control apparatus of an internal combustion engine according to the present invention is provided with oxygen storage amount estimating means, downstream exhaust air-fuel ratio detecting means, maximum oxygen storage amount estimating means, and air-fuel ratio target setting means. The oxygen storage amount estimating means estimates an oxygen storage amount of an exhaust purifying catalyst, based on a history of an oxygen adsorption/desorption amount of the exhaust purifying catalyst located on an exhaust path. The downstream exhaust air-fuel ratio detecting means is located downstream of the exhaust purifying catalyst and detects an exhaust air-fuel ratio downstream of the exhaust purifying catalyst. The maximum oxygen storage amount estimating means estimates a maximum oxygen storage amount, based on an oxygen storage amount estimate when the exhaust air-fuel ratio detected is a predetermined air-fuel ratio. This permits effective utilization of oxygen occlusion capability of the exhaust purifying catalyst and improvement in exhaust purification performance.

The invention provides an oxygen adsorbent, a preparation method and application thereof. The oxygen adsorbent material is a mixed conductor ceramic material which has oxygen (O2) selectivity and is subjected to chemical oxygen adsorption and deoxygenation by using oxygen vacancies (or gap oxygen positions) in crystal lattices; and the oxygen adsorbent only absorbs oxygen in air flow, but not absorbs any other non-oxygen components. The preparation method comprises the following steps of: mixing soluble salt solution of all metal ions forming a composite oxide uniformly; and preparing multi-metal composite oxide powder by using an organic acid complexing method and a concentrating and gelatinizing method. The novel oxygen adsorbent is used for high-temperature variable-pressure oxygen adsorption or variable-temperature oxygen adsorption so as to perform air separation, or remove impurities from trace oxygen, or be used as an oxygen-storing material. The novel oxygen adsorbent has the advantages of high oxygen adsorption capacity, high oxygen adsorption rate and extremely high oxygen selectivity.

The invention discloses a monatomic noble metal catalyst, as well as a preparation method and application thereof in low-temperature catalytic-oxidizing formaldehyde. The monatomic noble metal catalyst comprises a carrier and noble metal dispersed in the surface of the carrier in a monatomic way, wherein the dispersity of the noble metal in the catalyst can reach to the monoatomic dispersion level, and the noble metal and the catalyst carrier have strong interaction; an oxidation-reduction ability, an oxygen adsorption and desorption performance, a formaldehyde activation capacity and other performances of the catalyst are remarkably improved; compared with a manganese dioxide material noble metal catalyst without noble metal, the purification performance on formaldehyde with different concentrations is remarkably improved. The preparation method is fast and simple in preparation process, cost-saving, and capable of realizing monoatomic dispersion of the noble metal in the carrier surface; according to the noble metal catalyst with monoatomic dispersion prepared by adopting the method, the dispersity of the noble metal is improved, the use cost of the noble metal is reduced, and meanwhile, the catalyst is ensured to have sufficient and high-efficient purification capacity on the gas-state formaldehyde.

A perpendicular magnetic recording medium has high recording density and excellent read-write characteristics. The recording medium has a magnetic layer of a multilayered lamination structure composed of laminated cobalt layers mainly containing cobalt and noble metal layers of platinum or palladium. At least one of the cobalt layers and the noble metal layers contains at least one element selected from the group consisting of Ru, Ta, Nb, Mo, Mn, Cr, Si, and Ni, or an oxide, in a concentration ranging from 1 to 15 mol %. The magnetic layer is formed on an underlayer of ruthenium or the like for reducing magnetic interaction between the magnetic particles in the magnetic layer. The surface of the underlayer is treated for oxygen adsorption before depositing the magnetic layer to suppress magnetic interaction between the magnetic particles in the magnetic layer.

The invention discloses a preparation method of an ethanol gas sensor component having an ultrafast response recovery property. In the preparation method, LaFexO3 nano particles in non-stoichiometric ratio prepared through a sol-gel method are employed as a working substance to prepare a beside-heating-type ceramic tube gas sensor component. By means of reduction of a relative element ratio of iron to lanthanum in a precursor, the carrier concentration is increased and the resistance of the component is reduced. By means of selection of a proper La/Fe element ratio, size of crystal grains is reduced and oxygen adsorption capacity is improved, so that the gas sensor is improved in sensitivity on ethanol, is reduced in working temperature and is reduced in response recovery time. A LaFe0.8O3 beside-heating-type ethanol gas sensor prepared in the invention can reach 138 in the sensitivity on ethanol in 1000 ppm at the working temperature of 140 DEG C, wherein the response and recovery times are respectively 1 s and 1.5 s. The gas sensor is less than 22 in all sensitivities on methane, acetone, carbon dioxide and glycerol in 1000 ppm. The gas sensor is high in sensitivity, is low in the working temperature, is ultrafast in response recovery property and is high in selectivity at the same time on ethanol, and is low in cost and is environmental-friendly.

An exhaust emission control device includes an adsorbent trapper having an adsorbent for adsorbing and desorbing hydrocarbon in exhaust gas, a catalytic converter, a main exhaust gas passage with a first valve, a bypass exhaust gas passage with a second valve and a control unit. The bypass exhaust gas passage bypassing the first valve is connected with the adsorbent. The control unit controls the first and second valves to desorb the hydrocarbon from the adsorbent when a condition is satisfied. The condition is that the catalyst converter is in active, an oxygen adsorption amount of the catalyst converter is not less than a first predetermined amount and an exhaust gas amount is not more than a second predetermined amount. The first valve is opened and the second valve is closed when the condition is not satisfied during desorption of the hydrocarbon from the adsorbent.

A gas detecting method includes heating a gas detector, formed of a gas sensing layer and an adsorption layer, for an oxygen adsorption period t₀ at an oxygen adsorption temperature T₀; heating the gas detector for a target gas adsorption period t₁ at a target gas adsorption temperature T₁ at which a target gas is adsorbed to the adsorption layer, heating the gas detector for a target gas desorption period t₂ at a target gas desorption temperature T₂ at which the target gas adsorbed to the adsorption layer is desorbed to move to the gas sensing layer; and calculating a gas concentration of the target gas from a sensor resistance of the gas sensing layer. A gas detecting device includes the gas detector and a drive processing unit configured to carry out the method.

The present invention provides a low-cost ozone production method and apparatus for carrying out ozone/oxygen separation using an ozone adsorbent, that re-uses the recovered oxygen as a feed for ozone production, and that desorbs and recovers the adsorbed ozone using dry air. In the method and apparatus, a gas containing an ozone and oxygen two-component gas supplied from an ozone generator is pressurized, introduced into an ozone adsorbent-packed adsorption column, and brought into contact with the adsorbent to adsorb the ozone to the adsorbent. Using dry air as a counterflow purge gas for the adsorbed ozone, the ozone is desorbed from the ozone adsorbent-packed adsorption column loaded with adsorbed ozone by depressurizing the adsorption column or air is introduced as a purge gas from the rear of the column into the adsorbent bed, whereby an ozone and air two-component gas is recovered. The method and apparatus use, as the ozone adsorbent, at least one selected from the group consisting of (1) pentasil-type zeolites, (2) acid-treated pentasil-type zeolites, (3) mesoporous silica, and (4) acid-treated mesoporous silica.

The invention discloses a coal spontaneous combustion tendency identification method based on double-oxygen uptake. The coal spontaneous combustion tendency identification method comprises the following steps: putting a broken and filtered coal sample in a spiral reactor, putting the reactor in a set constant temperature furnace, introducing in dry air, determining oxygen concentrations at the outlet of the reactor under the conditions of 30 DEG C and 90 DEG C respectively, converting the physical oxygen consumption and the chemical oxygen consumption in every gram of coal sample in the low-temperature oxidation process respectively according to the change of the oxygen concentrations, and carrying out weight calculation through the two parameters to obtain a coal spontaneous combustion tendency determination index, wherein the larger the value of the index is, the easier the spontaneous combustion is. Through the obtained technical effect, the physical oxygen consumption and the chemical oxygen consumption in the low-temperature oxidation process are effectively combined to identify coal spontaneous combustion tendency, therefore, the disadvantage that the coal spontaneous combustion tendency cannot be comprehensively evaluated by a physical oxygen adsorption method singly depending on coal is effectively overcome. A double-oxygen uptake method can be used for identifying the coal spontaneous combustion tendency more scientifically and reasonably, the implementation method and the test process are easy and feasible, and the standard of classification is unified.

A semiconductor device includes a substrate, a two-dimensional (2D) material layer formed on the substrate and having a first region and a second region adjacent to the first region, and a source electrode and a drain electrode provided to be respectively in contact with the first region and the second region of the 2D material layer, the second region of the 2D material layer including an oxygen adsorption material layer in which oxygen is adsorbed on a surface of the second region.

The invention discloses a high-performance oxygen reduction catalyst based on surface function enhancement provides a preparation method of the above catalyst. The catalyst is a HCM/Pt/C catalyst witha core-shell structure, the material of the shell is a porous heteroatom-doped carbon material coating the surface of a Pt active center. Since the heteroatom-doped carbon material has a special adsorption-enrichment effect on oxygen, the material can provide an oxygen-rich environment for an active site, the collision frequency of reaction gas oxygen and the active site is increased, and the kinetic reaction rate of an oxygen reduction reaction is greatly improved. At the same time, the electronic effect at a HCM/Pt interface optimizes the electronic structure of Pt, so that the adsorption of Pt on an oxygen reduction reaction intermediate is weakened, and the desorption rate is increased to provide a site for subsequent oxygen adsorption. On the other hand, a carbon shell around Pt particles prevents migration and agglomeration, and the overall stability of the catalyst is greatly improved.

The invention relates to a TiO2 sensitive layer structure used for an oxygen sensor and a preparation method of the TiO2 sensitive layer. By subjecting the TiO2 sensitive layer structure to reticulate processing, crack formation and spread can be inhibited, so that thermal stress caused cracks can be effectively reduced. And the increase of a surface-volume ratio facilitates oxygen adsorption, thus enhancing the TiO2 sensitive layer sensitivity and reducing the response time. The preparation method of the TiO2 sensitive layer provided in the invention is carried out on a silicon substrate equipped with heating wires, and consists of: first preparing an insulating layer on the heating wires, preparing interdigital electrodes on the insulating layer, then preparing a TiO2 film on the interdigital electrodes, and performing reactive ion etching to make the TiO2 film into a reticulate structure.

The invention relates to a formaldehyde-sensitive material CdGa2O4 nano fibers with ultrahigh sensitivity and selectivity and a preparation method thereof and belongs to the field of inorganic functional materials. The preparation method includes: using Cd salt and Ga salt as the precursors, dissolving the precursors into a mixed solvent of ethanol and N, N-dimethyl formamide, using polyvinyl pyrrolidone to regulate the viscosity of the solution, and using the electrostatic spinning technology to prepare the nano fibers. The formaldehyde-sensitive material CdGa2O4 nano fibers and the preparation method thereof have the advantages that the fibers are modified by a small amount of CdO nano particles in a phase separation manner, so that part of Ga<3+> in CdGa2O4 spinel replaces tetrahedral interstice Cd<2+> to generate free electrons, oxygen adsorption of the nano fibers is increased favorably, and the formaldehyde sensitivity of the nano fibers is increased; the nano fibers have extremely high sensitivity (100ppm, S=60.0) to formaldehyde under low operation temperature (110 DEG C), the nano fibers have extremely high selectivity to other volatile organic compounds such as methanol, ethanol, acetone and benzene, and the lowest formaldehyde detection limit (33ppb) of the nano fibers is lower than national standards.

A fluorescent labeling reagent of the present invention includes an inorganic fluorescent particle and a material (A) having a material (B) of biological origin adsorbed or bound thereto. The inorganic fluorescent particle is integrated with the material (A) so as to form the reagent of the present invention. The inorganic fluorescent particle used in the present invention is capable of emitting light with a wavelength of 650 nm to 1600 nm in the infrared region or the near-infrared region which can be detected by means of Si-CCD or InGaAs-PD and can penetrate an H₂O rich sample when excited by light with a wavelength of 650 nm or longer which has the shortest transparent wavelength of AlInGaP-LD including oxygen adsorption type hemoglobin used for DVDs etc.

The invention provides a mixing device for metal powder coating production. The mixing device comprises a tank body, wherein an air inlet is formed in the bottom of the tank body, an oxygen adsorption tower is arranged outside the tank body, the oxygen adsorption tower is filled with an oxygen adsorbent, compressed air is led to the bottom of the oxygen adsorption tower and is communicated with the air inlet through a gas pipeline arranged at the top of the oxygen adsorption tower, a feeding port is formed in the top of the tank body, and a discharging port is formed in the bottom. The mixing device for metal powder coating production can act on the compressed air though the oxygen adsorbent, and the led gas which does not contain oxygen can effectively prevent metal in a coating from being in contact with the oxygen in the compressed air, prevent the metal from being oxidized and further improve the quality of a metal powder coating finished product.

The invention discloses an oxygen carrier for smokeless combustion technology and a preparation method thereof. The oxygen carrier is prepared by combining cerium-based composite oxygen carrier materials of Fe2O3 and ZrO3 by a cosediment water-hot synthesis method and a mechanical mixing method and is used for the transmission of oxygen needed in smokeless combustion, wherein Fe2O3 has a low cost; low valent Fe3+ is introduced in CeO2 lattices to not only obviously improve the oxygen storage performance of CeO2, but also improve the surface state of the CeO2 and promote the formation of oxygen adsorption sites due to the existence of iron species; and Zr4 with a smaller radius is adulterated to the CeO2 lattices to effectively improve the stability and anti-sintering capability of the CeO2. Therefore, by using the cerium-based material modified by Fe and Zr as the oxygen carrier of the smokeless combustion, the oxygen storage capability and cycle performance of the oxygen carrier can be improved, the cost can be obviously reduced and the efficiency of fuel combustion can be improved.

The invention discloses a flexible packaging material with an oxygen adsorption function based on natural gallic acid, a preparation method for the packaging material and an application of the packaging material, and belongs to the technical field of packaging materials. The flexible packaging material comprises at least four functional structure layers. The outmost layer is an oxygen blocking layer. An oxygen adsorption layer, which comprises the gallic acid and a polyurethane binder, is below the oxygen blocking layer. An activation layer (catalyst layer), which comprises sodium carbonate and EVA resin, is below the oxygen adsorption layer. The innermost layer, below the activation layer, is a food contacting layer and also an oxygen permeating layer. On contacting water vapor, oxygen adsorption film prepared by the method starts the oxygen adsorption function and slowly generates an inert gas carbon dioxide at the same time. The packaging material is particularly suitable for storage and fresh-keeping of beer, fruit juice and sodas, and is capable of avoiding oxidization of nutritional ingredients of oxygen sensitive food and beverage, improving food quality and prolonging the shelf life.

The invention provides a zeolite adsorbent for generating oxygen by mean of air separation and a preparation method of the zeolite adsorbent for generating oxygen by mean of air separation, belonging to the field of the preparation of inorganic material and adsorbent. The method is characterized in that the method is a preparation method of 13X zeolite adsorbent, which takes purified, dispersed and surfacely modified attapulgite clay as binder. The preparation method comprises the following steps of: firstly, purifying, dispersing and surfacely modifying the natural attapulgite clay by sodium pyrophosphate, sodium hexametaphosphate or sodium polyacrylate dispersing agent-containing water solution under the effects of mechanical stirring and ultrasonic oscillating, and preparing the 13X zeolite adsorbent by using the purified, dispersed and surfacely modified attapulgite clay as binder, wherein the adsorbent is high in nitrogen adsorption capacity and nitrogen-oxygen adsorption separation ratio, thereby being capable of being taken as the adsorbent for generating oxygen by mean of air separation. The natural attapulgite clay ore can be treated by the combined action mechanism of the ultrasonic oscillation and the dispersing agent, and the purifying, dispersing and surface modifying of the natural attapulgite clay ore can be completed for once, so that the preparation process is simple and easy to control.

Belonging to the technical field of oxide semiconductor gas sensors, the invention provides an ethanol gas sensor based on a zinc ferrite nano-sensitive material and a preparation method thereof. Thepreparation method includes: taking a zinc salt, an iron salt, an organic ligand and an organic solvent as the raw materials, subjecting the mixture to ultrasonic dispersion, then carrying out solvothermal reaction, and conducting washing, drying and high-temperature calcinations on the product to obtain a hollow spindle structure zinc ferrite nano-sensitive material; and finally, constructing theethanol gas sensor with the zinc ferrite nano-sensitive material. The invention has the beneficial effects that: the raw materials are easily available, the cost is low and the method is simple; thezinc ferrite nano-sensitive material is a hollow structure, has a high specific surface area and has abundant oxygen adsorption functional groups on the surface, and can improve the gas sensitive performance of the material; the ethanol gas sensor has low working temperature, and is a low energy consumption ethanol gas sensor.

The invention relates to a degassing agent with a protective layer as well as a preparation method thereof. The degassing agent provided by the invention is composed of degassing agent particles of dual-layer structures; the core comprises the main components of Zr, V and Fe; the protective layer comprises the main component of Ni. According to the invention, the degassing agent particles with the protective layer are prepared by chemical coating, and the degassing agent with the protective layer is prepared by compressing and sintering; the surfaces of the degassing agent particles are coated with a Ni protective layer; Ni has a dissociation function to a hydrogen molecule and can improve the absorbing capacity of hydrogen, and moreover, the protective layer can prevent oxygen adsorption and reduce the activation temperature. The degassing agent provided by the invention can be activated in the process of baking at 180-350 DEG C, has a favorable degassing function after baking at room temperature, and can be used for absorbing and removing internal residual gases in high-vacuum devices.

An oxygen-enriched combustion-supporting technology and its device. The technological process is that after air is compressed by an air compressor, after dust removal, oil removal, and drying, it enters an air storage tank, passes through an air intake valve, and enters an adsorption tower to continuously output high Purity of the product oxygen; the oxygen reaches the required purity of 30% after passing through the gas storage tank and the mixer. Its devices are air compressor, air storage tank, high-efficiency oil remover, air purifier, precision filter, activated carbon adsorber, air buffer tank, oxygen production adsorption tower, oxygen process tank, gas storage tank I, blower, storage The gas tank II, the mixer and the gas storage tank III are sequentially connected to form. The invention can reduce the ignition point temperature and burnout time of fuel, reduce the amount of flue gas after combustion, and increase the utilization rate of heat.

The invention discloses a method for synthesizing a silver and cuprous oxide composite material by laser. The method comprises the following steps: taking silver-copper alloy as a raw material, polishing and cleaning the surface of a target material, placing the target material in a beaker, adding deionized water, starting a nanosecond pulsed laser device, and ablating a silver-copper alloy target; and taking out a solution in the beaker, carrying out centrifuging and enrichment on the solution, then placing the solution in a refrigerator and carrying out freeing and solidifying, and drying the frozen and solidified solution in a vacuum freezing and drying machine to obtain silver and cuprous oxide composite nanoparticles. By the synergistic effect of silver and cuprous oxide, the problems of weak oxygen adsorption of existing silver nano particles and poor oxygen reducing ability of the cuprous oxide are solved, and a fuel cell cathode oxygen reducing catalyst of which the oxygen reducing property is superior to that of a commercial precious metal platinum and carbon catalyst can be obtained in a common synthesis environment at normal temperature and under normal pressure. The process is simple and is easy to control; the yield of products is high; and therefore, the method is a green synthesis process.