32 results about "Hydrogen analysis" patented technology

The invention provides a method for preparing a high-performance molybdenum-based hydrogen evolution electrode from a phosphide molybdate precursor, which belongs to the field of electrocatalytic hydrogen evolution in water electrolysis and chlor-alkali industry. In the present invention, the nickel foam is firstly pretreated, and then the molybdate precursor is grown in situ on the surface of the pretreated nickel foam substrate by a hydrothermal synthesis method, and finally the prepared precursor and the phosphorus source are put into a tube furnace together. The molybdate precursor was phosphated to prepare a high-performance molybdenum-based hydrogen evolution electrode. The method of the invention is novel, the required process is simple, the production cost is low, the requirements for equipment are low, and it is suitable for industrial production, and the electrode has a large specific surface area, is firmly combined with the substrate, has excellent hydrogen evolution activity and stability, and can be widely used in water Electrolysis, chlor-alkali industry hydrogen analysis field.

The present invention disclosed a solitary immersion coating method to prepare MOS 2 ORgo‑nio@ni bubble hydrogen analysis method and preparation method, including the following steps: (1) Molybdenum compounds, sulfur compounds and non -ion surface active agents (2‑10): (4‑12): 1 Weight ratio dissolved dissolvedIn the ion water, the water heat treatment at 140‑200 ° C is 16‑36 h, and MOS is obtained 2 ; (2) Use the improved Hummer method to handle the natural graphite powder for RGO; (3) soak the foam nickel to the concentration of 0.2‑1.0m in the solution of 20‑50min in the solution containing the oxidant, get NIO@ni; (4) The preparation will be preparedMOS 2 , RGO is scattered in the PEG solution, which is suspended solid solution; (5) NiO@ni on the suspended solid solid fluid through multiple impregnation, lifting, drying, and the procedure under the protection of the atmosphere is heated and baked.Catalytic hydrogen composite material.

The invention discloses a preparation method of a graphite material for an oxygen, nitrogen and hydrogen analysis instrument, comprising the following steps: 1) preparing a paste; 2) extruding into a green bar; 3) carbonizing to prepare a carbonized bar; 4) purifying Obtain high-purity graphite materials for oxygen, nitrogen and hydrogen analysis instruments. In the present invention, low-nitrogen natural microcrystalline graphite is used as the main raw material, which significantly reduces the nitrogen content of the raw material compared with the current production technology that generally uses calcined petroleum coke and calcined pitch coke as raw materials, and is more conducive to production to meet the requirements of oxygen, nitrogen and hydrogen analysis. Graphite material for instruments. The natural microcrystalline graphite of the present invention has the advantages of high degree of graphitization and good lubricity, so the use of natural microcrystalline graphite as a raw material is beneficial to reduce the resistance between materials during molding, and obtain products with fine and compact structure and good uniformity; during the carbonization process, Using a specific heating system can effectively prevent the product from cracking, increase the carbon residue rate of the binder, and then increase the density and strength of the product.

The present invention provides an oxygen production total hydrocarbon analysis control system and control method. The control system includes: an oxygen generator system, an analysis system and a DSC system. The oxygen generator system includes a first air separation system and a second air separation system. , the third air separation and liquid oxygen tank, the analysis system includes a first analysis channel, a second analysis channel, a third analysis channel and a hot standby analysis channel, and the DSC system includes a control unit. The control method includes: S1, input of combustion air; S2, input of combustion hydrogen; S3, input of total hydrocarbon sample gas; S4, input of total hydrocarbon analyzer; S5, analysis and control of the total hydrocarbon content of the oxygen generator system. Compared with the prior art, the present invention has the following beneficial effects: when any air separation analyzer or its unit parts fails or is damaged, or when the analyzer is off-line due to calibration and maintenance, it can continue to monitor the total of the corresponding air separation. Hydrocarbon content, to avoid the risk of explosion caused by excessive accumulation of total hydrocarbons in air separation.

The invention relates to a full-degassing-lighter-hydrocarbon automatic sample introducing system used for lighter hydrogen analysis. The full-degassing-lighter-hydrocarbon automatic sample introducing system comprises a heating part, a timing control part, a temperature control part, a heat distilling degasser, an automatic sample introducing system, a power supply and an R232 circuit which are assembled in a casing, wherein the timing control part, the temperature control part and the heating part are connected together. A mud slurry pot of the heat distilling degasser is arranged on the heating part, the heat distilling degasser and the automatic sample introducing system are connected with the A end of a T-shaped electromagnetic valve of the automatic sample introducing system by the sample gas outlet of the heat distilling degasser, and the automatic sample introducing system is connected with the R232 circuit. The invention has the advantages of full automation, and no boiling phenomenon if the mud slurry is heated; the danger is reduced, the pollution of the chromatogram post caused by the separation of heavy hydrocarbon is avoided, quantitative tubes are used for sample introduction, the consistency of the sample introducing quantity at each time is guaranteed, and the analyzing performance of the instrument is improved.

The invention relates to a method for accurately measuring a hydrogen evolution temperature range of a steel product. Under an ultrahigh vacuum state, a pre-treated steel product test sample is uniformly heated to a target temperature; a heating speed is 100 DEG C / h-300 DEG C / h, and a target temperature is 800 DEG C-850 DEG C; in a uniform heating process, the change of a hydrogen evolution amount along the temperature is measured by utilizing a hydrogen analysis mass spectrometer; and a temperature region corresponding to the rapidest range of a hydrogen evolution speed is found out according to a change rule of the hydrogen evolution speed along the temperature, and an optimal hydrogen evolution temperature range of the test sample is obtained. The problem in a traditional hydrogen diffusion process that the temperature range is difficult to set is solved, and the problems that a previous hydrogen measurement method has limitation on sample requirements and the like can be solved. The method is a simple, rapid, accurate and environment-friendly method for measuring an optimal temperature of hydrogen evolution, and the blank that the hydrogen evolution temperature range of the steel product cannot be accurately measured is filled.

Provided is a high-strength steel member which has a predetermined chemical composition, and a tensile strength of at least 1000 Mpa, and which contains: at least 0.10% by area of at least one Ti precipitate which has an average circle equivalent diameter of 30-200 nm at a position of 1 mm deep from the surface of the steel member, and is selected from the group consisting of Ti carbides, Ti nitrides and composite compounds thereof; and at least 0.5 mass ppm of non-diffusible hydrogen, in hydrogen temperature-programmed desorption analysis, released in a temperature range of 400-800 DEG C.

The present invention relates to a method for increasing the hydrogen analysis detection rate of a hydrogen and carbon monoxide production apparatus, wherein the method is used for detecting the water content, the methane content, the hydrogen content and the carbon monoxide content in a CO product. According to the method, the output section of the detection apparatus is provided with a hydrogen analyzer, the hydrogen analyzer is connected with a sampling pipeline, the subsequent pipeline is provided with a rapid shut-off valve, the sampling pipeline is a sampling pipe with a diameter of 6 mm, testing is performed through the hydrogen analyzer after sampling is performed by using the sampling pipe, and the rapid shut-off valve on the subsequent pipeline is closed within 40 s when the detected hydrogen content achieves the alarm value. Compared with the method in the prior art, the method of the present invention has the following characteristics that: the response of the on-line analyzer can be increased by 4 times, the result action time is 26 s, the apparatus testing is smoothly passed through, and the on schedule gas supply is performed after the CO product customer approves.

The invention relates to the technical field of nanomaterials, photocatalysis, and water splitting and desorption hydrogen detection, in particular to a scale-like g-C 3 N 4 Nanosheet and preparation method thereof, scaly g-C of the present invention 3 N 4 g‑C in nanosheets 3 N 4 Nanosheets are small and regular scale-like structures, and the g-C 3 N 4 Nanosheet size is 50~600nm, g‑C 3 N 4 The thickness of the nano sheet is 5-30nm. Scaly g-C of the present invention 3 N 4 The nanosheets are prepared by calcining after mixing three kinds of salts and nitrogen-containing organic raw materials. g-C of the present invention 3 N 4 Nanosheets have a unique scale-like structure, have higher crystallinity, and can effectively expand the range of light absorption, reduce the recombination probability of photogenerated electron-hole pairs, and improve their photocatalytic activity and water splitting hydrogen desorption performance. The invention can be effectively applied to the technical field of photocatalytic water splitting and decomposing hydrogen.

The invention belongs to the technical field of catalyst preparation, and specifically relates to a preparation method and application of a nickel phosphide-ruthenium phosphide / foamed nickel three-dimensional self-supporting electrode material, comprising the following steps: 1) preparing a foamed nickel self-supporting nickel-ruthenium layered bilayer Metal hydroxide; 2) Preparation of nickel phosphide-ruthenium phosphide / nickel foam three-dimensional self-supporting electrode material; application of nickel phosphide-ruthenium phosphide / foam nickel three-dimensional self-supporting electrode material in electrolyzed water. The preparation process of the present invention is convenient and simple, can greatly reduce the cost of the electrocatalyst, and has excellent performance in alkaline electrocatalytic hydrogen evolution, and also exhibits excellent catalytic performance in alkaline electrocatalytic oxygen evolution and full hydrolysis, and the three-dimensional porous The foamed nickel carrier has excellent conductivity, which can increase the loading capacity of the active sites and accelerate the transfer speed of electrons and protons; the in-situ growth method can effectively improve the interaction between nickel phosphide-ruthenium phosphide and the carrier foamed nickel, and then enhance its electrocatalytic stability.

The present invention provides a non -layered SN 2 P 2 S 6 The preparation method of nanoscopic tablets and its application in the field of photocatalytic hydrogen analysis includes the method of mixing sulfur sulfur powder and SNS 2 The steps of nano crystal reaction of chemical gas deposition; of which, the mixed powder mixed powder is located on the upstream of the reactor, SNS 2 Nano -crystals are located in the downstream, the upstream heating temperature is set to 270 to 330 ° C, and the downstream heating temperature is set to 340 to 380 ° C.The method of the present invention can quickly and cost SN that is evenly distributed on the base with a uniform area on the base 2 P 2 S 6 Nano -table 2 P 2 S 6 Nano -sheet crystals are good, chemically stable, and have broad application prospects in the field of photocatalytic hydrogen.This method is easy to operate, the required equipment is simple, and can be applied to large -scale industrial production in high efficiency.

The invention discloses a method for preparing p-acetoxy-benzoic acid. The method comprises the following steps of: reacting p-hydroxybenzoic acid as a raw material, acetic anhydride as an acylating agent and pyridine as a catalyst in a condition of 1.2-1.5 times of the excessive acetic anhydride: firstly, adding a certain amount of the p-hydroxybenzoic acid and the acetic anhydride into a reactor; dropwise adding the pyridine while stirring and raising the temperature to 80-85 DEG C; controlling the dropwise adding speed, wherein preferentially the temperature raising speed of a reactant is not beyond 10 DEG C; keeping the reaction temperature and continuously stirring for 2-3 h after adding the p-hydroxybenzoic acid and the pyridine and completely converting the reactant into crystals; and finally, repetitively washing the cooled reactant till the pH value of filtrate is 3-4 so as to obtain a crude product of acetoxy-benzoic acid. Both purities of a liquid chromatogram analysis result and a nuclear magnetic resonance hydrogen analysis result of the p-acetoxy-benzoic acid are more than 99.5%. According to the method disclosed by the invention, the conversion rate of the p-acetoxy-benzoic acid is more than 96%; furthermore, the content of by-products is low; and the difficultly for further refining and purifying the product is greatly reduced.