61results about How to "Good dehydrogenation performance" patented technology

The invention relates to a method for preparing aromatic hydrocarbon and cyclopentenone from biomass derivative gamma-valerolactone by catalytic conversion, which comprises the following steps: (1) using biomass derivative gamma-valerolactone as a raw material, which is prepared by carrying out hydrogenation reaction on levulinic acid; (2) introducing one or more transition metals into a zeolite molecular sieve, and preparing a reaction catalyst at the reaction temperature of 350-550 DEG C by using a fixed bed or fluid bed as a reactor; (3) in an inert or reducing atmosphere, carrying out contact reaction on the raw material gamma-valerolactone and catalyst under the reaction pressure of 0-10 MPa; and (4) after the pyrolysis gas is condensed, collecting the liquid product in the condensation receiver, thereby obtaining the aromatic hydrocarbon product (of benzene, toluene and xylene) and the cyclopentenone product. By using the renewable biomass derivative gamma-valerolactone as the raw material, the method has the advantage of milder reaction conditions, and the catalyst is simple to prepare and easy to recover and reuse.

The invention discloses a high-hardness flux-cored welding wire for overlaying repair of a continuous casting roller, and belongs to the technical field of welding in material processing engineering. An H08A cold-rolled steel strip is adopted as an outer cover, a flux core comprises the following components in percentage by weight: 20-40% of TiO2, 5-15% of high-carbon ferrochrome, 12-30% of low-carbon ferrochrome, 0.5-5% of Mn-Si alloy, 0.5-5% of Al-Mg alloy, 5-15% of Ni, 0.5-2.5% of fluoride, 5-15% of Mo, 0.5-2.5% of V, 2-10% of Cr, 0.5-5% of Al2O3 and the balance of iron powder. The filling rate of the traditional Chinese medicine core of the flux-cored welding wire is 20-35%. The welding wire has the advantages that the flux-cored welding wire adopts a self-protecting overlaying manner, and shielding gas and welding flux are not needed in the overlaying repair process of the continuous casting roller, so that the repair cost can be greatly reduced, the manual labor intensity is lowered, and the production efficiency is improved; the welding wire has good arc stability, excellent abrasion-proof property and excellent thermal fatigue resistant property, and the service life of the continuous casting roller is effectively prolonged.

The invention discloses a method for preparing an attapulgite/carbon composite adsorbent by one-step carbonization-activation. According to the method, nature attapulgite clay with low cost and a biomass cellulose carbon source are taken as raw materials, ZnCl2 is taken as an activating agent, and the attapulgite/carbon composite adsorbent is prepared by a one-step calcination method. According to the method, amorphous carbon with an organophilic property can be supported on the surfaces of attapulgite crystals, and the specific surface area of a composite can be further greatly enlarged by activation and pore-forming effects of ZnCl2. Compared with the natural unmodified attapulgite clay, the removal rate against pollutant methylene blue in water of the composite adsorbent after activation is greatly improved. According to the method disclosed by the invention, the sources of the raw materials are extensive, the price is low, the preparation process is simple, and the reaction conditions are mild; and the adsorption capability of the attapulgite/carbon composite adsorbent prepared by the method disclosed by the invention against pollutants in water is obviously upgraded, and the attapulgite/carbon composite adsorbent can be used for advanced treatment of the organic pollutants in the water.

The invention provides a welding method for low-carbon high-strength steel. The welding method for the low-carbon high-strength steel comprises the following steps of: 1) forming a welding groove on the low-carbon high-strength steel with a laser blanking method, and forming a welding line between the welding grooves of two pieces of low-carbon high-strength steel to be welded; and 2) welding the welding line by consumable electrode mixed gas metal arc welding, filling a welding wire in the welding process, and ensuring that the welding environment temperature is higher than 5DEG C. Specifically, the step 2) comprises the following steps of: 21) carrying out backing weld to the welding line by non-pulse consumable electrode mixed gas metal arc welding, forming a backing weld layer on the bottom of the welding line, and filling the welding wire in the welding process; and 22) carrying out cosmetic welding to the welding line by pulse consumable electrode mixed gas metal arc welding, forming a plurality of cosmetic layers above the backing weld layer, ensuring that two adjacent cosmetic layers are provided with overlay regions, and filling welding wire in the welding process. According to the welding method for the low-carbon high-strength steel, the stress concentration is lowered, and the welding quality of the low-carbon high-strength steel is improved.

The invention relates to a method for preparing aromatic hydrocarbons through catalytic conversion of an oxygenated compound-containing raw material. The method mainly solves the problem of low yieldof aromatic hydrocarbons in the prior art. The oxygenated compound-containing raw material enters an oxygenated compound-containing raw material catalytic conversion reaction system to obtain a reaction product rich in aromatic hydrocarbons; the reaction product rich in aromatic hydrocarbons goes through a cooling and separating system to obtain a water phase product and an oil phase product, thewater phase product and the oil phase product are discharged from the system, obtained hydrogen, methane and C2 hydrocarbons are discharged from the system, and at least parts of obtained C3 or more non-aromatic hydrocarbons enter a light hydrocarbon aromatization reaction system; and the obtained light hydrocarbon aromatization reaction product returns to the cooling and separating system. The method adopting the above technical scheme well solves the problem, and can be used in the industrial production of the aromatic hydrocarbons.

The invention relates to a graphite negative material, a preparation method thereof and a cell. The preparation method of the graphite negative material comprises the following steps that a celluloseraw material, a catalyst and a dispersant are mixed, ball-milled and dried to obtain nanocrystal spheroidized precursor particles; and the nanocrystal spheroidized precursor particles are burned and then graphitized to prepare the graphite negative material. The catalyst is composed by a combination of a nickel compound and an electron deficiency compound. The graphite negative material has high electrochemical performance, and can reduce the production cost substantially.

The invention discloses a method for repairing waste oil-based drilling fluid sediments through engineering bacterium-plant combination. The method comprises the following steps: firstly, processing clean soil and the waste oil-based drilling fluid sediments into mixed soil; pre-planting the plants for 20 days; adding two types of engineering bacteria, NH4NO3, KH2PO4, and a surfactant into the mixed soil; then, planting plants for 30-300 days; within 7 to 10 days after planting, processing NH4NO3 solid powder and KH2PO4 into water solutions with the concentration of 0.05-1.2 mg/kg and 0.05-1.5mg/kg respectively, then uniformly spraying the aqueous solution into the soil, wherein 0.5-2.0 L of the aqueous solution is sprayed to 1 m<3> of the mixed soil. The problems that in the prior art, the treatment efficiency is low, and secondary pollution is likely to be caused can be solved.

The invention relates to a method for dehydrogenating low-carbon stainless steel in a refining furnace. The method comprises the following steps of: carbon deoxidization in a vacuum state and strong stirring for dehydrogenating in a vacuum state after reduction; the steps are characterized in that: in the first step, at the early stage of molten steel processing, the molten steel dehydrogenated by utilizing high-carbon deoxidization boiling under a high vacuum degree in a VOD (vacuum oxygen decarburization) refining furnace has not more than 6ppm of initial hydrogen content and 0.25-0.35 percent of carbon content, and under the condition that the vacuum degree is not more than 3*10<2>Pa, the carbon deoxidization boiling time is 15-20min; and in the second step, after reduction, strong stirring for dehydrogenating is carried out by utilizing steel ladle bottom argon blowing under the high vacuum degree, after all reduction materials are added for 2min and under the condition that the vacuum degree is not more than 3*10<2>Pa, steel ladle bottom argon blowing is carried out, the argon intensity is not less than 12L/min, and stirring dehydrogenating is carried out for 16-20min. According to the method disclosed by the invention, the dehydrogenating effect is enhanced, the dehydrogenating rate can reach 50-80 percent so that the hydrogen content in the stainless steel is completely reduced to 1.5ppm-0.5ppm from the initial 2-6ppm, and the requirements of the low-carbon stainless steel for the hydrogen content are achieved.

Provided is a copper oxide catalyst for preparing isobutene by isobutane dehydrogenation, which takes nitrogen doped mesoporous carbon as a carrier and comprises 2-20% by mass of copper oxide as an active component, preferably 5-15%, being balanced with nitrogen doped mesoporous carbon. The preparation method comprises the following steps: mixing a copper-containing compound and citric acid at a mol ratio of 1:0.5-1:3; dissolving by adding water to prepare a blue solution with the copper concentration of 0.2-2.2 mol/L; adding nitrogen doped mesoporous carbon at a ratio of 319-3898 grams of nitrogen doped mesoporous per mol of copper into the aqueous solution; stirring at a constant temperature, drying, and roasting; and to obtain obtaining the copper oxide catalyst. The catalyst is used for preparing isobutene by isobutane dehydrogenation through oxidation by carbon dioxide, the conversion rate of isobutane can reach 25-70%, and the selectivity of isobutene can reach 70-96%. The catalyst free of noble metal and highly toxic chromium metallic oxide is low in cost, environment-friendly, easy to prepare, and suitable for industrial production.

The invention discloses a welding wire for low alloy steel. The welding wire is prepared from components as follows: C, Si, Cu, Mg, Nb, Al, K, Mn, Ni, Cr, Ti, Sr, Mo, V, Nd, Ce and the balance of Fe and inevitable impurities. The welding wire for low alloy steel has good welding performance, during welding, electric arc is stable, small splashing is produced, welding fluid liquidity is good, the weld surface is uniformly covered with welding slag, so that interfacial tension of the welding slag and deposited metal is increased, slag detachability is improved, formation of the obtained weld is good, the weld surface is free of cracks and pores, and the deposited metal has good mechanical properties.

The invention discloses a high-tenacity anti-cracking aluminum alloy welding stick. The high-tenacity anti-cracking aluminum alloy welding stick comprises components including, by mass percent, Mg, Be, Si, Mn, Cr, Cu, Ti, Sr, Mo, W, V, Nb, Zr, Nd, Sc, Ce, Eu, Y and the balance Al and inevitable impurities. The provided high-tenacity anti-cracking aluminum alloy welding stick is reasonable in formula, arc stability is good, welding line forming is attractive, strength is high, low-temperature resistance and impact resistance are good, the bonding strength between the welding stick and a mother material is large, and performance is stable.

The present invention provides novel diamine-monoborane liquid organic hydrogen carriers with hydrogen storage capacities at least equivalent to prior art hydrogen carriers. The novel diamine-monoboranes of the invention provide advantages over the prior art including low cost due to the simple one-step chemical synthesis method between a diamine and a borane complex, and that the starting materials are inexpensive compared to the prior art. The novel diamine-monoboranes of the invention provide excellent dehydrogenation performance. With the presence of inexpensive and readily-available commercial catalysts, dehydrogenation occurs at ambient temperatures and pressures with high hydrogen purity. The resulting 1,3,2-diazaborolidines (cyclic diaminoboranes) are readily hydrogenated to produce the novel diamine-monoboranes of the invention. The invention also provides use of the diamine-monoboranes of the invention in a fuel cell or a portable power cell, or cell installed in conjunction with a hydrogen-burning engine. Other uses relate to transport down pipelines and in tankers.

The invention discloses a dehydrogenation catalyst, a preparation method and a hydrogen release method. A barrel is included, a heating device and a cooling device are arranged on the outer surface of the barrel; a baffle is arranged on the inner side wall of the barrel; two corresponding inner side walls of the baffle are connected with sliding devices; a plurality of bulges are arranged on the other two corresponding inner side walls of the baffle; a gas outlet pipe and a feeding pipe are arranged over the barrel; a gas inlet pipe is arranged under the barrel; a separating device and a bubble breaking plate are arranged in the upper of the interior of the barrel, the bubble breaking plate is fixedly connected with the baffle, the separating device is located under the bubble breaking plate, one end of the separating device is suspended in the barrel, the other end of the separating device is fixedly connected with the bubble breaking plate and communicated with the gas outlet pipe, a gas distributing plate is arranged in the barrel, the gas distributing plate is fixedly connected with the lower end of the baffle, and the gas distributing plate is located over the gas inlet pipe. The catalyst has the beneficial effects that the active components of the catalyst can be highly uniformly dispersed, the dehydrogenation effect is remarkably improved, and carbon deposition is effectively inhibited.

The invention relates to a preparation method for doping an MgH2/polymethyl methacrylate (PMMA) composite hydrogen storage material with TiH2 as a catalyst, particularly relates to a method for improving the dehydrogenation performance of the MgH2/PMMA composite hydrogen storage material by doping the material with TiH2 as a catalyst, and belongs to the field of material invention. The preparation method comprises the following steps: firstly, preparing a TiH2-MgH2 material by a solid-phase ball milling method; then performing ultrasound treatment on the TiH2-MgH2 material in a tetrahydrofuran (THF) solution in which PMMA is dissolved by a liquid-phase ultrasound method; and finally, carrying out temperature controlled vacuum drying so as to prepare the TiH2@MgH2/PMMA composite hydrogen storage material. The composite hydrogen storage material prepped by solid phase ball milling and liquid phase ultrasound treatment has good dehydrogenation performance. When the amount of the doped catalyst TiH2 is 10wt%-30wt%, the initial dehydrogenation temperature of the material is 120 DEG C; the constant-temperature dehydrogenation amount at 200 DEG C within 200 minutes reaches 3.7wt% (except for the mass ratio of a composite agent PPMA), and reaches 72.5% of the theoretical hydrogen content.

The invention discloses an RH furnace dehydrogenation method and device, and relates to the technical field of RH refining. The RH furnace dehydrogenation method specifically comprises the following steps: 1, initial conditions; 2, baking; 3, vacuumizing treatment; 4, vacuum heating; 5, vacuum dehydrogenation treatment; 6, vacuum decarburization treatment; 7, measuring; and 8, vacuum breaking. TheRH furnace dehydrogenation method is simple in process, convenient to operate and lower in cost, molten steel can be heated at the same time in RH vacuum treatment, the degassing temperature of the molten steel is guaranteed, the dehydrogenation efficiency is improved, each of an ascending pipe and a descending pipe in a dehydrogenation device is of a conical structure with a large bottom openingand a small top opening, scouring of the molten steel to the inner wall of a vacuum chamber can be reduced, the dehydrogenation effect of the device is effectively improved, the ascending pipe and the descending pipe in the design are good in corrosion resistance and high temperature resistance, and the service life is longer.

The invention discloses a preparation method of a hydrogenation and dehydrogenation catalyst, which comprises the following steps: S1, by taking tri(4-bromophenyl)triazine as a raw material, converting one bromophenyl group into an aniline group through amination reaction; s2, under light promotion with carbon monoxide and methanol as raw materials, carrying out catalytic reaction, so that the remaining two bromophenyl groups are converted into methyl benzoate groups; s3, performing saponification and acidification reactions in sequence, so that the methyl benzoate group is converted into a benzoic acid group; s4, adding 2,5-dihydroxy benzaldehyde, and enabling a benzaldehyde functional group to react with amido to finally generate an organic ligand with a Schiff base functional group; s5, sequentially adding active nanoparticles and metal salt, and reacting the materials to obtain the catalyst which takes the active nanoparticles as an active center and takes the metal organic framework as a carrier. The catalyst is suitable for hydrogenation and dehydrogenation reaction processes of an organic liquid phase hydrogen storage material, and has the advantages of high hydrogen storage energy density, low dehydrogenation temperature and high dehydrogenation speed.

The present invention relates to a zeolite catalyst for preparing light alkene by dehydrogenation of light alkane including a cocatalyst metal selected from tin (Sn), germanium (Ge), lead (Pb), gallium (Ga) and indium (In), and a preparation method of the same. The catalyst of the present invention is prepared by using the zeolite having a relatively high pore diameter, a structure of at least 12-membered ring, and a low acidity due to a SiO₂/Al₂O₃ ratio of at least 50, so that it can suppress the inactivation of a catalyst caused by pore clogging due to the formation of coke. Therefore the catalyst of the present invention can be effectively used as a catalyst for the preparation of light alkene by dehydrogenation of light alkane.

The invention discloses a liquid catalyst and application thereof. The liquid catalyst is used for catalytic cracking of hydrocarbons, and is composed of a first component and a second component, wherein the first component is selected from a metal simple substance or alloy, and the second component is selected from a metal carbide. When the liquid catalyst is used for catalytic cracking of hydrocarbons, carbon and hydrogen are generated, products can be directly separated and utilized in the whole catalytic cracking reaction process, no by-product is generated, the catalytic efficiency of theliquid catalyst is high, and the hydrocarbon conversion rate is high.