199 results about "Hydrogen adsorption" patented technology

A catalyst for internal combustion engine exhaust purification without frequently switching to a rich burn mode. The catalyst includes a catalyst A containing an NO_x absorbing substance and an NO_x reducing catalyst, a catalyst B containing a hydrogen adsorption substance and a hydrogen oxidizing catalyst, an electron conductive substance C, and an ion conductive substance D. Electrons move between the catalyst A and the catalyst B through the electron conductive substance C, ions move through the ion conductive substance D, and an electrochemical reducing reaction and an electrochemical oxidizing reaction respectively occur on the catalyst A and on the catalyst B. Therefore, it is possible to quickly reduce the adsorbed NO_x using the adsorbed hydrogen without depending on the atmosphere.

The invention provides a preparation method for synthesizing metal organic framework UiO-66 adsorbents by the aid of mixed ligands. The preparation method includes mixing zirconium sources and regulators with one another and then dissolving the zirconium sources and the regulators in solvents to obtain solution A; uniformly dissolving 2-aminoterephthalic acid, terephthalic acid and solvents to obtain mixed ligand solution B; dropwise adding the solution A into the solution B at the constant speed to obtain solution C; injecting the solution C into reaction kettles with polytetrafluoroethylenelinings and carrying out crystallization at the temperatures of 100-160 DEG C for 18-24 h; carrying out reaction, and then carrying out treatment to obtain target products. As proved by XRD (X-ray diffraction) analysis, the obtained products are UiO-66 adsorbent materials. The preparation method for synthesizing the adsorbent materials has the advantages that the preparation method is simple; theUiO-66 adsorbents synthesized by the aid of the mixed ligands are excellent in chemical and thermal stability; the hydrogen adsorption capacity of the metal organic framework UiO-66 adsorbents can beimproved to a great extent, and effective treatment methods and research directions can be provided to hydrogen adsorption separation and storage.

The preparation process of composite perovskite oxide loaded palladium catalyst includes the main steps of: compounding soluble metal salt solution with soluble salt of La, Co and Pd as material; dropping metal salt solution into citric acid as complexing agent to form sol; heating sol at 50-95 deg.c while stirring to obtain gel; drying at 110-160 deg.c for 10-24 hr and roasting at 600-1000 deg.c for 3-24 hr; and reduction processing of the obtained perovskite oxide. The catalyst is determined via X-ray powder diffraction process, hydrogen adsorption process and programmed heating-up desorption process to obtain its crystal phase, surface Pd density and oxygen adsorbing performance. The prepared catalyst is perovskite oxide loaded palladium catalyst with oxygen fault, and this structure has synergist effect of perovskite and Pd and excellent catalytic activity.

The invention relates to a modified activated carbon hydrogen sulfide adsorbent which is prepared from the following raw materials in parts by weight: 100-120 parts of activated carbon, 12-14 parts of copper sulfate, 20-23 parts of high-alumina bauxite, 4-5 parts of magnesium oxide, 5-6 parts of calcium oxide, 6-8 parts of sodium carbonate, 8-10 parts of modified attapulgite and a right amount of water. According to the invention, the activated carbon is modified by using copper sulfate, high-alumina bauxite, magnesium oxide, calcium oxide and sodium carbonate, so that the removal efficiency of hydrogen sulfide is increased; the reaction activity of the activated carbon is improved by processes such as calcination and spray drying, thereby being favorable to the removal of sulfides contained in low-concentration fume. The modified activated carbon hydrogen sulfide adsorbent is simple in process and easily available in raw materials, and can realize industrial production.

A material for the storage of hydrogen is provided comprising single wall carbon nanotubes (SWNT), wherein the majority of the diameters of the single wall carbon nanotubes of the assembly range from 0.4 to 1.0 nanometers (nm), and the average length is less than or equal to 1000 nm, or the diameters of the single wall carbon nanotubes of the assembly range from 0.4 to 1.0 nanometers (nm), and the heat (−ΔH) of hydrogen adsorption of the material is within the range from 4 kcal/mole H₂ to 8 kcal/mole H₂. Processes for the storage and release of hydrogen using the materials are disclosed.

The invention discloses a method for preparing 2,5-furandimethanol by selective hydrogenation of 5-hydroxymethylfurfural, and the method comprises the following steps: adding the 5-hydroxymethylfurfural, catalyst CuNPs@ZIF-8 and ethanol to a stainless steel closed reactor, charging with H2, and reacting at thetemperature of 120-150DEG C and the pressure of 1-4 MPa for 0.1-5 h. The method adopts the CuNPs@ZIF-8 as the catalyst, and the catalyst not only has large specific surface area, high dispersion of nano copper and good hydrogen adsorption performance, but also has simple preparation, lowprice and reusability. The method overcomes the problem of expensive use of precious metals as catalysts and low efficiency of non-precious metals as catalysts in prior studies.

The invention provides a blast furnace gas hydrolysis and dry fine desulfurization treatment system and method. The system comprises a gas cooling heat exchanger, a catalytic hydrolysis tower, a hydrogen sulfide adsorption tower and a catalytic oxidation tower. Blast furnace gas firstly enters the gas cooling heat exchanger to be cooled, the gas temperature is reduced by 5 DEG C through the cooling heat exchanger, and part of moisture is separated out. Then the blast furnace gas enters a catalytic hydrolysis tower, organic sulfur contained in the gas is converted into inorganic sulfur after passing through a hydrolysis catalyst, the hydrolyzed blast furnace gas is heated by a reheater at the front end of an adsorption tower and enters a hydrogen sulfide adsorption tower, and the inorganicsulfur in the gas is removed through a catalyst in the tower. The blast furnace gas without the inorganic sulfur can be directly conveyed to a downstream client side, and a catalytic oxidation step can also be added after hydrogen sulfide is adsorbed to remove COS, H2S and other sulfur-containing substances. The blast furnace gas hydrolysis reaction time only needs 1-3 seconds, the conversion ratecan reach 98% or above, the removal efficiency of the hydrogen sulfide adsorption catalyst is 90% or above, and the removal efficiency in the catalytic oxidation tower reaches up to 70% or above.

The invention provides methods, compositions, and systems for a reversible hydrogen storage material. The hydrogen storage material contains a lithium-magnesium compound, having LiMgN in a dehydrogenated state and a hydrogenated lithium magnesium product in a hydrogenated state, where the hydrogenated and dehydrogenated states are reversible. The lithium-magnesium compound is formed by reacting MgH₂ and LiNH₂ in a substantially inert atmosphere in amounts sufficient to obtain a hydrogen adsorption of at least 3 wt %, and in many cases up to about 8.1 wt %.

The invention discloses a hydrogen-explosion-preventing serious nuclear accident relieving device and a hydrogen-explosion-preventing serious nuclear accident relieving method, and belongs to the fields of safety equipment and technology of a nuclear power station. A hydrogen adsorption device is installed on the inner wall and in an upper space of a safety shell; by using the physical adsorptionproperty of a carbon nanofiber material, the hydrogen adsorption device is used for adsorbing and storing hydrogen without the help of external power; when a large amount of hydrogen is generated in the safety shell, the hydrogen adsorption device reduces the concentration of the hydrogen in the safety shell by adsorbing the hydrogen continuously and igniting the hydrogen, so that the explosion of the hydrogen is avoided; and the pressure in the safety shell is reduced, so that the aim of relieving a serious accident of a reactor is fulfilled. In the running process of the hydrogen-explosion-preventing serious nuclear accident relieving device, the external power is not required; the device can work stably for a long time, is reliable in performance, good in spare safety, convenient to implement and easy to control and meets the design requirements of a current novel nuclear power reactor.

The invention provides a refining apparatus of a pressure casting aluminium product. The refining apparatus comprises a melting furnace and a closed holding furnace; a height adjustable stirring shaft and stirring blades arranged on the stirring shaft are arranged above the melting furnace; a through hole used for delivering inert gas is arranged in the stirring shaft; the melting furnace is connected to the closed holding furnace by a feed delivery pipe; the closed holding furnace is provided with bleeder pipe; the refining apparatus also comprises a vacuum pump; and the closed holding furnace is connected to the vacuum pump by a vacuum pipeline. The invention also provides a refining technology of the pressure casting aluminium product. The refining technology is capable of avoiding secondary hydrogen adsorption and oxidation of refined molten aluminum in delivery process, reducing pores and impurities of the pressure casting aluminium product, and improving the quality of the pressure casting aluminium product greatly in the whole delivery process comprising melting of aluminum ingots, hydrogen removing treatment and heat preservation process. Application prospect of the technology is promising.

The invention discloses a helium circulation, purification and storage system. The helium circulation, purification and storage system comprises a pressure gas bottle, a gas extraction pump, an oil filtration filter, a low temperature filter and a hydrogen adsorption device; the pressure gas bottle is used for injecting helium gas into the system; the gas extraction pump is in series connection with an output end of the pressure gas bottle; the oil filtration filter is in series connection with an output end of the gas extraction pump; the low temperature filter is in series connection with an output end of the oil filtration filter; the hydrogen adsorption device is in series connection with an output end of the low temperature filter; an output end of the hydrogen adsorption device is input into a cryostat through a gas conveying pipeline, wherein the helium gas is to be supplied by the cryostat; the helium circulation, purification and storage system also comprises a gas storage tank which is used for recycling the helium gas in the system when the cryostat stops working; a gas outlet of the gas storage tank is connected with an input end of the gas extraction pump; a gas inlet of the gas storage tank is connected between the oil filtration filter and the low temperature filter. According to the helium circulation, purification and storage system, the structure is simple; the helium gas conveyed into the cryostat is high in purity and good in cooling effect; the helium gas can be recycled through the gas storage tank and accordingly the utilization rate of the helium gas is improved.

The invention discloses a combined production method of ultra-low-sulfur gasoline, which comprises the following steps: pre-hydrogenating full-distillate catalytically cracked gasoline and hydrogen after preheating, removing part of dienes in FCC gasoline raw materials, and part of light sulfurized gasoline. The reaction effluent is introduced into the fractionation tower, and it is fractionated into light gasoline and heavy gasoline at 65-100 ℃, and the sulfur content of the light gasoline is controlled at 20-50 μg/g; the heavy gasoline and hydrogen flowing out from the bottom of the fractionation tower are mixed into Aromatization/isomerization is carried out in the hydro-upgrading reactor to increase the octane number, and the reaction effluent enters the hydro-desulfurization reactor for selective hydro-desulfurization, and the sulfur content of heavy gasoline is controlled at 40-70 μg/g; The heavy gasoline after hydrogen desulfurization is subjected to gas-liquid separation, and the hydrogen sulfide is removed by stripping, and then mixed with light gasoline into the fixed bed hydrogen adsorption desulfurization reactor, and mixed with hydrogen for fixed bed hydrogen adsorption desulfurization reaction, so as to ensure the mixed gasoline The sulfur content is controlled within 10μg/g to achieve ultra-deep desulfurization without loss of octane number.

This invention provides for an apparatus and a method for operation of a cryogenic hydrogen storage system that contains a porous medium configured to adsorb hydrogen. The hydrogen storage and supply system includes a hydrogen source apparatus and a cryosorptive storage apparatus. Methods and devices that allow for an energy efficient filling of the cryosorptive apparatus from the hydrogen source apparatus are described. The cryosorptive hydrogen storage apparatus is filled with cold, pressurized hydrogen. During the course of filling, heat is generated in the cryosorptive storage device by the process of hydrogen adsorption on to the host medium. Methods and devices are provided for the removal the generated heat and the warm hydrogen. Further provided are devices and methods for the capture and recycle of escaped hydrogen within the hydrogen source apparatus.

The invention belongs to the technical field of hydrogen storage materials and particularly relates to a metal oxide and porous material composite hydrogen storage material and a preparation method thereof. The metal oxide and porous material composite hydrogen storage material is formed by compounding magnesium hydride, a porous material and a metal oxide, and the weight ratio of the magnesium hydride to the porous material to the metal oxide is (100-10): (5-0.1): (1-0.05). The magnesium hydride is taken as a base material, and metal oxide particles are mixed and grinded to obtain an activated magnesium hydride material; and the obtained activated magnesium hydride material is mixed with the porous material, and ball milling or compression is carried out to obtain the composite hydrogen storage material. According to the material and the preparation method, nanoscale metal oxide particles are added and compounded with the porous material, so that the hydrogenation speed of magnesium-based composite powder in the hydrogen charging ball milling process can be increased, and meanwhile, the hydrogen storage material has good characteristics in the aspects of hydrogen adsorption and desorption kinetics in combination with the properties such as excellent pore channels and high surface area of the porous material.

The invention belongs to the field of oil gas geochemistry, and in particular to a device and method capable of separating hydrogen and methane in a mixed gas and measuring a hydrogen isotope. The device comprises a gas sample inlet, a drying unit, a hydrogen adsorption separation unit, a quantifying loop, a vacuum unit and an isotope measuring unit; and the gas sample inlet, the drying unit, thehydrogen adsorption separation unit, the quantifying loop and the isotope measuring unit are sequentially connected in series; the hydrogen adsorption separation unit can release adsorbed hydrogen tomeasure the hydrogen isotope, so that the methane and hydrogen in the mixed gas are separated, the separated hydrogen and methane are used for measure of the hydrogen isotopes respectively, and measure of the hydrogen isotope of the hydrogen and the hydrogen isotope of the methane in the hydrogen-methane mixed gas is realized; and the vacuum degree of the whole system is high, deviation caused bymutual interference between a hydrogen peak and a methane peak in the prior art is overcome, and accuracy of an analytical test is improved.

The invention discloses a preparation method and application of a spherical adsorbent for efficiently removing low-concentration hydrogen sulfide. The preparation method comprises the following steps:taking pretreated industrialized spherical pseudo-boehmite as a carrier, then soaking the carrier in a certain amount of soluble alkali metal salt solution to obtain an adsorbent precursor, and drying and roasting the adsorbent precursor to obtain a load type adsorbent with high adsorption capacity. The adsorbent disclosed by the invention belongs to a dry desulfurization agent; firstly the adsorbent overcomes the defects caused by using a wet desulfurization agent that a liquid absorbent is used for removing sulfide, the treatment capacity of the equipment is large, the operation of the adsorbent is complicated, the adsorption capacity is low, the requirement of high adsorption capacity is difficult to meet, and especially, the wet process is difficult in meeting the high requirement ofremoving low-concentration hydrogen sulfide; secondly, the spherical adsorbent has the advantages of high adsorption capacity of adsorbing low-concentration hydrogen sulfide, large strength, low costand the like; and the spherical adsorbent is simple in preparation process and easy to produce widely and has good industrialized potential.

The invention provides a cerium-doped tungsten phosphide submicron sphere composite material, a preparation method and application thereof. Cerium in the cerium-doped tungsten phosphide submicron sphere composite material is uniformly doped in tungsten phosphide submicron spheres, and the cerium-doped tungsten phosphide submicron sphere composite material is prepared by loading cerium-doped tungsten oxide submicron spheres on a substrate through a solvothermal synthesis method and then phosphating the cerium-doped tungsten oxide submicron spheres. The preparation process adopted by the invention is simple, the obtained composite material has uniform particles, and when used as an industrial water electrolysis catalyst, the composite material has high charge transmission speed, enhanced hydrogen adsorption capacity and desorption capacity, improved electro-catalytic hydrogen evolution activity, excellent catalytic performance, and strong stability.