274results about How to "Improve hydrogen production performance" patented technology

The invention belongs to the technical field of chemical equipment, and relates to a method for producing hydrogen through coupled catalytic reforming and membrane separation reaction, and a device thereof, in particular to a method for producing hydrogen through fluidized-bed methane steam reforming, and a device thereof, which apply to the fields of petroleum, chemical industry and fuel cells. A main structure comprises a feed gas inlet, a pre-distribution chamber, a gas distribution plate, a palladium membrane component, a catalyst bed layer, a sampling port, a fluidized-bed reaction-zone bed body, a metal connection tube, a heating system, a hydrogen duct, an expansion section, a super pure hydrogen outlet, a vacuum pump, a backpressure valve, a liquid rotor flow meter, a water pump, an exhaust gas outlet, a heat exchanger, a gas rotor flow meter, a gas pump and a preheater, wherein the components are in gas-liquid communication and organic coordination to form a methane steam reforming hydrogen production device or reactor with a hydrogen selective membrane fluidized bed, and the top of the fluidized-bed reaction-zone bed body is sealed by adopting a cover-type structure. The invention has the advantages of simple process, low investment in equipment, good membrane separation performance and high hydrogen production rate.

The invention discloses an Al alloy material which reacts with water at room temperature to prepare hydrogen, and a use method thereof; the Al content in the alloy material is 3 weight percent to 95 weight percent, and the rest are one type or more than one type among Sn, Zn, Bi, Pb, Mg, Ca and In elements; when Ca and In are contained, the content of Ca and In is not more than 10 weight percent; the alloy material is prepared by melting alloy and then mechanically processing alloy cast ingots into foil-like or sheet-like materials; the material is taken as the raw material for preparing hydrogen, improves the hydrogen preparation capability when the cost is quite low, can prepare hydrogen on a large scale, and is easy to be stored and transported.

A method for producing hydrogen by performing the steps of feeding a synthesis gas mixture to a pressure swing adsorption unit; producing hydrogen from the synthesis gas mixture in the pressure swing adsorption unit; feeding the remainder of the synthesis gas mixture at low pressure to an electrochemical cell wherein hydrogen is separated from the remainder of the synthesis gas mixture and is simultaneously pressurized; feeding the pressurized hydrogen from the electrochemical cell to join with the hydrogen generated in the pressure swing adsorption unit and recovering the combined hydrogen product. The synthesis gas mixture may be from a reformation unit and it may be subject to a water gas shift reaction. In addition to the production of hydrogen, the separation of hydrogen in the electrochemical cell increases the concentration of carbon dioxide in the residual waste gas and enables carbon dioxide recovery.

The invention provides preparation of an MFe2O4/BiVO4 composite material with good PEC performance. The preparation comprises the steps of firstly adopting Zn<2+> as a structure-directing agent and preparing BiVO4 of a tree leaf structure in a high-concentration electrolyte; successfully loading magnetic NiFe2O4 and CoFe2O4 nano particles into the surface of the BiVO4 of the tree leaf structure through combination of chemical deposition, heating treatment and electrophoretic deposition technologies; and building n-n and p-n junctions through electrophoretic deposition, wherein the formed NiFe2O4/BiVO4 and CoFe2O4/BiVO4 composite material has the tree leaf structure, recombination of photo-induced carriers is effectively inhibited by the structure and separation of electrons and holes is accelerated, so that the MFe2O4/BiVO4 composite material has excellent PEC activity, is used for hydrogen evolution reaction as a photoanode, and has excellent hydrogen generation performance.

The invention discloses a composite piezoelectric catalyst as well as a preparation method and application thereof in sound catalytic cracking hydrogen production from water. The preparation method comprises the following step: by virtue of an oxygen vacancy defect on the surface of zinc oxide, performing in-situ reduction on the zinc oxide on the surfaces of nano rods to form an elementary substance of gold, thereby obtaining a ZnO-Au composite piezoelectric catalyst, wherein the zinc oxide nanorods with special orientation generate positive and negative charges on the surfaces by enriching sound wave energy in an environment through a piezoelectric effect, then pure water decomposition can be promoted, and hydrogen can be generated; in addition, after the elementary substance of gold isloaded, the hydrogen production capability of the ZnO-Au composite piezoelectric catalyst can be greatly improved, the hydrogen generation velocity of the ZnO-Au composite piezoelectric catalyst undersound wave driving is 4 times that of non-loaded zinc oxide nanorods, limits of a single piezoelectric material as a sound catalyst are broken through, efficient utilization of sound energy is achieved, a novel way is provided for water cracking hydrogen production under the piezoelectric effect, and the composite piezoelectric catalyst has wide application prospects in the field of mechanical energy-hydrogen energy conversion, and is simple in preparation method and applicable to industrial production.

The invention discloses a layered two-dimensional material interlayer-confined metal or metal compound composite material as well as a preparation method and application thereof. The composite material comprises a layered two-dimensional material and a metal or metal compound confined among layers of the layered two-dimensional material. The method comprises the following steps: 1) performing lithiation treatment on the layered two-dimensional material to obtain a lithiated layered two-dimensional material; and 2) mixing the dried lithiated layered two-dimensional material, a metal salt and asolvent, performing sealing in a reaction kettle, and performing a hydrothermal reaction to obtain the layered two-dimensional material interlayer-confined metal or metal compound composite material.The preparation method disclosed by the invention can realize controllable preparation of a series of two-dimensional material interlayer-confined metal and metal compound composite materials; and theprepared composite material, especially a two-dimensional molybdenum disulfide interlayer-confined metal hydroxide composite material has the advantages of high electrocatalytic activity and good stability when being used as a hydrogen evolution catalyst, and has application prospects in the field of production of hydrogen by electrolysis of water.

A self-flocculating hydrogen-generating bacterium, Harbin ethanolgenic bacterium YUAN-3 (CGMCC No.1152) is disclosed, which is an obligate anaerobic bacillus with the metabolic characteristic of ethanol fermenting. Its maximal specific hydrogen generating rate is 22.6 mmlH2/g drycell.h. It can become the depositive flocculated particles in the hydrogen generating bioreactor. The hydrogen can be continuously generated without carrier and filler.

The invention discloses a preparation method and application of a VN@WN nanoparticle with an electrocatalysis function. The preparation method comprises the following steps: firstly, grinding a mixture of dicyandiamide, ammonium metavanadate and phosphotungstic acid, carrying out sieving with a 60-mesh sieve to obtain a mixture, putting the mixture into a porcelain boat, putting the porcelain boatinto a tubular atmosphere furnace, and respectively placing two furnace plugs at the two ends of a tube at an interval of 5 cm; introducing inert gas into the tubular atmosphere furnace to exhaust air in the tube, controlling the inner air pressure of the tube to be -1 MPa to 0 MPa, heating the tube to 700 DEG C to 900 DEG C at a heating rate of 10 DEG C/min, and maintaining the tube at the temperature for 120 min to 180 min; and carrying out cooling to obtain a sample and grinding the cooled sample in a mortar to obtain the VN@WN nanoparticle. The VN@WN nanoparticle with the electrocatalysisfunction prepared by using the preparation method is applied to the enhancement of hydrogen production activity. The VN@WN nanoparticle prepared by the method has an electrocatalytic function, can provide a clean and sustainable energy source for electrolysis of water, and is capable of eliminating the obstacle that a high-cost platinum-based material is widely applied to the industry. The electrocatalyst is simple in preparation process, good in hydrogen production performance and good in stability and circularity.

The invention belongs to the hydrogen-evolution material field and particularly discloses a transition metal phosphide hydrogen-evolution composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a phosphorus source into water, and adding a certain amount of an organic amine alkali compound, so as to obtain a solution A, wherein the phosphorus source is at least one of a polymer containing phosphonic acid groups and a monomer containing phosphonic acid groups; adding a transition metal source into the solution A, and stirring to obtain dispersion liquid B; adding agar into the dispersion liquid B, and stirring, so as to obtain double-network hydrogel; cooling the double-network hydrogel, and drying, so as toobtain dried gel; and calcining the dried gel at 750-1000 DEG C in a protective atmosphere, so as to obtain the transition metal phosphide hydrogen-evolution composite material. The preparation method is wide in raw material source and low in cost, obtained transition metal phosphide has excellent electro-catalytic property, and the preparation method is hopefully applied to the industrial production.

The present invention relates to microalgae hydrogen preparing technology, and is especially the two-step hydrogen preparing photolysis process with marine green algae. Green algae obtain biomass accumulation by means of photosynthesis. The present invention features that strain Tetraselmis subcordiformis after obtaining biomass accumulation is first stored in dark oxygen-deficient place for dark induction of 20-45 hr and then lighted to produce hydrogen. The present invention has the advantages of obtaining excellent marine hydrogen-producing microalgae, reasonable hydrogen-making path with simple operation, developed sulfur-free sea water induced reversible hydrogen-producing enzyme system with activity and lighting hydrogen production, and the decoupling agent to suppress photosynthetic oxygen release, but not photosynthetic hydrogen release.

The invention discloses a method for preparing a CdS quantum dot/Bi2MoO6/graphene composite photocatalyst and belongs to the technical field of synthesis of inorganic environmental-friendly photocatalytic materials. According to key points of the technical scheme of the present invention, the method for preparing the CdS quantum dot/Bi2MoO6/graphene composite photocatalyst disclosed by the invention comprises the following step: compounding CdS quantum dots, Bi2MoO6 and graphene, to obtain the CdS quantum dot/Bi2MoO6/graphene composite photocatalyst, wherein a molar ratio of the CdS quantum dot to Bi2MoO6 is 1:(0.1-0.5); and the mass ratio of the graphene to Bi2MoO6 is (0.03-0.15):1. According to the CdS quantum dot/Bi2MoO6/graphene composite photocatalyst prepared by the method disclosed by the invention, the recombination rate of photo-induced electrons and holes is effectively reduced, photocatalytic water splitting hydrogen production catalytic activity of the CdS quantum dots is improved, and a light etching phenomenon of the CdS quantum dots in the photocatalytic water splitting process is retarded. Moreover, the method has the advantages of mild operating conditions, low agglomeration degree of the prepared product and high photocatalytic activity.

The invention discloses a hybrid material based on a macrocyclic compound photosensitive dye and titanium dioxide and a preparation method thereof, and application of the hybrid material to photocatalysis. The hybrid material comprises the macrocyclic compound photosensitive dye and titanium dioxide, wherein the macrocyclic compound photosensitive dye is a calixarene compound or porphyrin compound. The invention also discloses the preparation method for the hybrid material based on the macrocyclic compound photosensitive dye and titanium dioxide, and application of the hybrid material to photocatalysis. The organic-inorganic hybrid material prepared from the macrocyclic compound photosensitive dye and titanium dioxide has a hierarchical porous structure, and can improve the free diffusionof gas and surface adsorption of CO2, increase the adsorption quantity and activation degree of reactants, reduce the possibility of electron-hole recombination and effectively enhance photocatalysisefficiency. Moreover, the hybrid material of the invention has high stability and is improved in cyclic utilization stability in photocatalysis.

The invention discloses a method for preparing hydrogen by using an improved silica-alkali method, and belongs to the technical field of on-line hydrogen preparation. The preparation method comprises the steps that silicon iron alkali composite powder and potassium hydroxide are mixed in the mass ratio of (1-1.2):(0.5-15), and then added into an aqueous reaction medium with the mass being (1-30) times of the mass of the mixture, a reaction is conducted at the temperature of 25-70 DEG C, and the hydrogen is prepared, wherein the silicon iron alkali composite powder comprises silicon-iron alloy. According to the method, the process is simple and easy to control, the hydrogen yield can be improved, and the hydrogen preparation cost can be reduced.

The invention discloses a synthesis method of a ball-flower shaped structure ZnO/ZnWO4 photocatalyst, and belongs to the technical field of chemical industry. The method comprises the following steps: mixing and putting zinc nitrate (Zn(NO3).6H3O) and sodium tungstate (Na2WO3.2H3O) chemical reagent materials into deionized water, uniformly stirring the materials, performing microwave radiation reaction through a microwave reactor, repeatedly washing the materials through deionized water and absolute ethyl alcohol separately, and drying the materials, so as to obtain the final product ZnO/ZnWO4 composite photocatalyst. The surface appearance, photocatalytic activity and the property of photocatalytically splitting of water into hydrogen of the photocatalyst are determined, and the product performance is greatly enhanced in terms of degrading organic pollutant malachite green and photocatalysis of photocatalytically splitting of water into hydrogen. A microwave-assisted one-step synthesis method is adopted, and the synthesis method has the characteristics of short reaction time, uniform generated products and simple and practical production process, and samples and mass production performance are stable and reliable.

The invention belongs to the technical field of microbial fermentation biological hydrogen production, and particularly relates to a medium for promoting hydrogen production of HAU-M1 photosynthetic bacteria flora and application thereof. The medium comprises 0.1-1g/L of NH4Cl, 0.01-0.5g/L of MgCl2, 0.01-0.2g/L of yeast extract, 0.1-1g/L of K2HPO4, 1-3g/L of NaCl, 1-5g/L of sodium glutamate and 0.3-2.5g/L of hydrogen-producing amino acid. The hydrogen-producing amino acid is one or a mixture of a plurality of L-cysteine, L-alanine, L-threonine, L-leucine and L-serine in any ratio. Based on a general inventive concept, the invention also provides application of the medium in biological hydrogen production, thereby effectively improving the hydrogen production capability of the HAU-M1 photosynthetic bacteria flora.

The invention discloses a liquid phase pulse discharge plasma hydrogen production device and a hydrogen production method thereof. The hydrogen production device comprises a liquid phase reaction chamber, a base, a first electrode, a second electrode and a gas vent, wherein the base is capped on the liquid phase reaction chamber; a closed space for containing reactants and finishing a hydrogen production reaction is formed between the base and the liquid phase reaction chamber; the first electrode and the second electrode are arranged in the closed space and are opposite to each other; the first electrode and the second electrode are made of metal materials; and the gas vent is communicated with the closed space. The space distribution and density of plasma can be effectively improved, and production of hydrogen is promoted.

The invention discloses hexagonal tubular carbon nitride as well as a preparation method and application thereof. The preparation method comprises the following steps: heating a nitrogen-containing organic precursor to 450-600 DEG C and calcining to obtain bulk carbon nitride; dispersing the bulk carbon nitride in water, and performing a hydrothermal reaction at 150-200 DEG C to obtain floc; heating the floc to 450-750 DEG C and calcining to obtain the hexagonal tubular carbon nitride. The method disclosed by the invention has the advantages of simplicity and easiness in implementation, low price and high repeatability and is of great enlightening significance to the synthesis of a tubular material. The hexagonal tubular carbon nitride disclosed by the invention has a special morphology with great innovativeness while the size distribution is uniform; compared with traditional two-dimensional morphology such as carbon nitride nano sheet, the hexagonal tubular carbon nitride has a larger specific surface area and is beneficial to providing more active sites and improving the reaction activity. In terms of hydrogen production through visible light photocatalysis, the hexagonal tubular carbon nitride has relatively excellent photocatalysis property that common flaky carbon nitride can never achieve.

The invention discloses a preparation method of a highly doped nitrogen, phosphorus and carbon nano-sheet for efficient hydrogen production to improve the dosage concentration of heterogeneous atoms such as nitrogen and phosphorus in carbon materials, increase catalytic activity sites in the carbon materials and improve catalytic activity of the carbon materials. An appropriate proportion of nitrogen sources, carbon sources and phosphorus sources are dissolved, stirred, mixed, dried, pyrolyzed and the like to obtain the high-concentration nitrogen and phosphorus doped carbon nano-sheet. The preparation method has the advantages that raw materials are easily obtained, the technology is simple, operation is convenient, the preparation method is low in cost and environmentally friendly and the like. The whole reaction process is low in requirement for preparation equipment, industrial production is facilitated, the prepared materials have nitrogen and phosphorus with high dosage concentration, electro-catalysis hydrogen production performance is effectively improved, and the preparation method has practical industrial significance.

An energy recovery device of automobile exhaust comprises a thermoelectric power generation device and an electrolytic hydrogen production device, wherein the electrolytic hydrogen production device comprises an electrolyzer, a hydrogen separator, a supercharger and a hydrogen storage device. The thermoelectric power generation device supplies power to the electrolyzer, the hydrogen separator and the electrolyzer are communicated with the supercharger, an outlet of the supercharger is communicated with an inlet of the hydrogen storage device, and the hydrogen storage device is sequentially communicated with an air intake channel of a motor through a hydrogen permeation control valve and a backfire preventing device. The hydrogen control valve is connected with a controller in a control mode, wherein the controller is connected with the hydrogen permeation control valve and the throttle valve opening sensor which is installed at the position of a throttle valve of the motor simultaneously. A safety switch valve which is used for pressure limiting is further arranged on the hydrogen storage device. The invention relates to a technology of energy recovery and recycling. Electric power generated by the thermoelectric power generation device can be utilized continuously, and the energy recovery utilization effect of the automobile exhaust is good. Changes of the motor are hardly needed, performances of the motor can be improved, the power performance and the emission performance of the motor are improved, and fuel consumption of the automobile is reduced.