16results about How to "Reduce sintering" patented technology

The invention belongs to the technical field of energy and petrochemical engineering catalysts, and particularly discloses a preparation method and application of a copper-zinc-aluminum spinel solid solution catalyst. The Cu-Zn-Al spinel solid solution catalyst is prepared by ball-milling copper, zinc and aluminum precursors and then roasting at 800-1200 DEG C in the air atmosphere, and the preparation method is simple, does not need a large amount of solvent, is less in wastewater and avoids the influence of other impurity ions. The Cu-Zn-Al spinel solid solution catalyst prepared by the invention is used for methanol reforming hydrogen production reaction, the methanol conversion rate is as high as 95.5%, the H2 selectivity in the product is 74.8%, and the CO selectivity is 0.76%, so that the Cu-Zn-Al spinel solid solution catalyst has high activity, high selectivity and good reaction stability.

An integrated electric wheel with a cooling function comprises a hub motor with a cooling water channel, a planetary reducer connected with a rotating shaft of the hub motor, a hub connected with the output end of the planetary reducer and a brake fixed to the hub, and is characterized in that the cooling water channel in the hub motor extends forwards to the periphery of the planetary reducer; and the planetary reducer is circularly cooled, and an oil guide assembly for collecting oil liquid thrown out in the circumferential direction and conducting lubricating and heat dissipation on the planetary reducer is assembled on the planetary reducer. Lubricating and radiating efficiency of parts close to the center of the speed reducer is effectively improved, temperature rise and part abrasion in the speed reducer are slowed down, the probability of abnormal transmission caused by bearing sintering and gear abrasion due to high temperature is effectively reduced, transmission reliability of the planetary speed reducer is improved, and the service life of the planetary speed reducer is prolonged. Integrated optimization of multiple structures of the electric wheel is formed, the integration degree is improved, whole vehicle arrangement is facilitated, the power density of the electric wheel is improved, and the cruising ability of the electric wheel is improved.

The invention discloses a high-density low-expansion multiphase honeycomb ceramic and a preparation method thereof, a pre-sintering composite additive is added into a mixed ceramic raw material, the weight of the pre-sintering composite additive is 5-9wt% of that of the mixed ceramic raw material, and the pre-sintering composite additive is prepared by mixing yttrium oxide and aluminum titanate according to the mass ratio of 1: (5-7), and then adding the mixed material into the mixed ceramic raw material to prepare the high-density low-expansion multiphase honeycomb ceramic. And pre-sintering at 1350-1600 DEG C, and grinding to obtain the product. According to the invention, the pre-sintered composite additive is added into the mixed ceramic raw material, so that the prepared multiphase honeycomb ceramic has high density and low expansion coefficient at the same time, meanwhile, cracking is avoided, and the sintering temperature is reduced.

The invention relates to the technical field of preparation of methanol through hydrogenation, in particular to a preparation method and application of a hydrophobic supported catalyst, and the preparation method comprises the following steps: S1, preparing a mesoporous gamma-Al2O3 carrier by adopting an evaporation-induced self-assembly method; s2, carrying out hydrophobic modification on the gamma-Al2O3 carrier by adopting a method of heating in a water bath kettle at a constant temperature and a low temperature and adopting silane reagents such as dimethyl diethoxy silane, propyl trimethoxy silane, octyl trimethoxy silane and the like; s3, loading Cu and ZnO by adopting a wet impregnation method or an easy impregnation-capture method; the surface property of the gamma-Al2O3 material is improved through hydrophobic modification of a methyl group, and the catalyst prepared by the method has higher hydrophobicity and has higher methanol selectivity and reaction stability compared with an unmodified catalyst in the reaction of synthesizing methanol through co-hydrogenation of carbon monoxide and carbon dioxide.

The invention provides an anti-aging vehicle natural gas catalyst, which comprises a carrier, a lower coating coated on the carrier and an upper coating coated on the lower coating, each of the lower coating and the upper coating comprises a coating material and a noble metal loaded on the coating material, the coating material comprises alumina, a Ce-Zr composite oxide and nickelic oxide, and the noble metal is loaded on the coating material. The noble metal of the lower coating is Pd, the noble metal of the upper coating is Rh, and the upper coating and / or the lower coating further comprise noble metal Pt. According to the anti-aging vehicle natural gas catalyst and the preparation method thereof, high nickel oxide is introduced into a coating material of the catalyst, so that sintering of a catalyst coating can be slowed down, and the problem of precious metal embedding caused by structural collapse after the catalyst coating is aged can be effectively solved; the problem that the catalytic ability of the aged catalyst to nitrogen oxide and methane is greatly reduced is solved, so that the anti-aging performance of a catalyst coating can be effectively improved.

This application discloses a calcium-based carbon dioxide adsorbent, its preparation method, and its application, relating to the field of adsorbent technology. The preparation method of the calcium-based carbon dioxide adsorbent includes the following steps: obtaining calcium hydroxide, an unsaturated organic compound, magnesium oxide, and aluminum oxide; mixing the calcium hydroxide, unsaturated organic compound, magnesium oxide, and aluminum oxide and adding them to a solvent; heating and stirring to obtain a mixed suspension, wherein the unsaturated organic compound is an organic acid or an organic aldehyde; drying the mixed suspension to obtain a dried powder; subjecting the dried powder to medium-temperature combustion to obtain a calcium-based carbon dioxide adsorbent precursor, wherein the medium-temperature combustion temperature is 400–600°C; and subjecting the calcium-based carbon dioxide adsorbent precursor to a first high-temperature calcination to obtain the calcium-based carbon dioxide adsorbent, wherein the first high-temperature calcination temperature is 700–1000°C. This application solves the technical problem of poor adsorption performance of existing calcium-based carbon dioxide adsorbents.

The application discloses a regeneration method of deactivated residual oil hydroprocessing catalyst. The method comprises the following steps: deoiling and decarburization treatment of the deactivated residual oil hydroprocessing catalyst, ultrasonic cleaning of the catalyst by using a non-ionic surfactant, mixing of the catalyst with a binary system solution containing an organic acid and an oxidant, hydrothermal treatment of the mixture, impregnation of the mixture by using an impregnation solution containing a polyacid and a dihydric alcohol, and calcination of the impregnated mixture to obtain the regenerated hydroprocessing catalyst. The method can effectively leach poisoning substances such as V, Ni and Fe in the deactivated catalyst, maximally reduce the loss of catalytic active components, restore the pore structure of the waste catalyst, expose the active centers, and has the characteristics that the catalyst has a high initial sulfuration degree and high catalytic activity when applied to the residual oil hydrogenation reaction after the regeneration treatment.

The utility model belongs to the technical field of carbon dioxide hydro-conversion, particularly relates to a membrane reactor for a reaction-separation coupling process, and aims to solve the problem of performance failure of the membrane reactor in a high-temperature environment in the background technology, the following scheme is provided: the membrane reactor comprises a reaction tube body, end covers are screwed on the outer walls of two ends of the reaction tube body, and the end covers are screwed on the outer walls of two ends of the reaction tube body; a product gas outlet is welded to one end of the outer wall of the bottom of the reaction tube body, a feed gas inlet is welded to the other end of the outer wall of the top of the reaction tube body, and a purge gas outlet is welded to the outer wall of one side of one end cover. The NaA molecular sieve membrane loaded by the ceramic hollow fiber carrier is adopted, a compact and defect-free zeolite membrane layer is formed through a multi-time in-situ growth process, the membrane can still keep a stable hydrophilic nano channel (the aperture is 0.4 nm) at the temperature of 300-400 DEG C and the high pressure of 4 MPa, water molecules are preferentially adsorbed and permeated, the thermodynamic equilibrium limitation is effectively broken, and compared with a traditional molecular sieve membrane, the membrane has the advantages that the membrane is simple in structure and convenient to use, and the cost is low. The thermal stability is obviously improved.

Relating to the technical field of castable, the invention discloses an energy-saving and environment-friendly furnace top nano thermal insulation castable, which comprises the following raw materials by weight: 13-15 parts of hollow microspheres, 2-4 parts of a nano thermal insulation material, 20-25 parts of perlite, 32-35 parts of flint clay, 5-7 parts of activated alumina micro powder, 5-7 parts of soft clay, 20-22 parts of high temperature cement, 3-5 parts of an expanding agent, and 0.3-0.4 part of a water reducer. The nano thermal insulation material comprises the following raw materials in parts by weight: 60-80 parts of fumed silica, 20-30 parts of titanium dioxide, 5-7 parts of glass fibers and 3-5 parts of modified fibers. The synthesized modified fiber is obtained by grafting a functional monomer containing a terminal carbon-carbon double bond, triazine and POSS (Polyhedral Oligomeric Silsesquioxane) with an organic fiber. The furnace top nanometer heat preservation castable is good in compression strength, high temperature resistance and flame retardance, energy-saving, environment-friendly, good in castable integrity, more convenient to construct and worthy of popularization.

The invention belongs to the field of alumina powder preparation, and particularly relates to a method for preparing spherical Al2O3 nanocrystals at low temperature, which mainly comprises the following steps: S1, preparing a porous material; s2, preparing a carboxyl precursor; s3, preparing an aluminum oxide precursor; and S4, calcining the precursor to obtain the spherical nano aluminum oxide. The preparation method comprises the following steps: grafting carboxyl into a porous material to obtain a carboxyl precursor material, adsorbing boehmite with a proper particle size on the surface of a pore channel by virtue of a relatively large specific surface of the porous material, replacing an aluminoxane precursor with carboxylic acid, and decomposing or carbonizing the carboxyl precursor by virtue of subsequent one-step high-temperature pyrolysis, so as to obtain the porous material. Partially decomposed long-chain organic groups or degraded carbides thereof can inhibit too fast growth of aluminum oxide particles and reduce the transformation temperature of an alpha-Al2O3 phase, and spherical nano alpha-Al2O3 with the size of 20-30 nm can be obtained.

The invention relates to the technical field of calcium hydroxide production, and particularly discloses a device and method for producing calcium hydroxide from solid waste, the device comprises a stirring barrel, a feeding port and a discharging port, the feeding port is connected to one side of the stirring barrel, calcium oxide is conveyed into the stirring barrel through the feeding port, and the discharging port is connected to the other side of the stirring barrel; the discharging port is used for conveying calcium hydroxide after production is completed out of the stirring barrel for the next production step, the weight monitoring assembly is connected into the stirring barrel, and when the feeding port conveys the raw material calcium oxide into the stirring barrel, the weight monitoring assembly can monitor the weight of the raw material in real time; the control assembly is connected to one side of the stirring barrel, the control assembly is used for storing water and controlling the water delivery amount, the water injection amount is controlled in real time through the raw materials with different volumes and weights, and then excessive water is prevented from being injected into the stirring barrel; and product sintering and performance reduction caused by too high temperature of calcium hydroxide are prevented.

The present application relates to a kind of boron stainless steel sheet for thermal neutron absorption preparation method, comprising the following process steps: (1) induction melting; (2) atomization and deposition; (3) forging; (4) hot rolling; (5) profile processing.The present application is through innovative process route, reasonable melting, plate processing deformation and heat treatment process, significantly improve the microstructure of material, refine hard and brittle boride particles, and then improve the hot workability of material and the mechanical properties of finished plate, meet the higher requirements of boron stainless steel sheet for thermal neutron absorption.According to the process manufactured by the present application, the performance of the plate is similar to powder metallurgy boron stainless steel, also has excellent comprehensive performance, and the process flow is shorter, and the manufacturing cost is also lower.

The invention discloses a tungsten oxide loaded carbon coated nickel catalyst and a preparation method and application thereof, the catalyst comprises a carrier and an active component loaded on the carrier, the carrier is tungsten oxide containing positive pentavalent tungsten ions and positive hexavalent tungsten ions at the same time, and the active component is carbon layer coated nickel. The catalyst can be applied to preparation of ethylene glycol through catalytic conversion of cellulose, 100% conversion of the cellulose can be achieved in a water solvent only in the initial hydrogen atmosphere, the yield of ethylene glycol monomers can reach 75%, one-step conversion of the cellulose to high-value fuel is completed, and the catalyst is suitable for industrial production. The preparation and reaction processes of the catalyst have the characteristics of high efficiency, greenness, economy and reproducibility, and the industrial application prospect is wide.

This invention provides a method for hydrogen-deuterium substitution in heterocyclic aromatic hydrocarbons using a binary, inexpensive metal catalyst, belonging to the field of organic synthesis technology. The method uses heterocyclic aromatic hydrocarbons as raw materials, adding heavy water and a binary, inexpensive metal catalyst with or without solvent. Under inert gas protection, the hydrogen-deuterium substitution reaction is carried out at elevated temperature. After the reaction, the product is separated and purified to obtain the deuterated heterocyclic aromatic hydrocarbon compound. The preparation method provided by this invention uses inexpensive heavy water as the deuterium source and an inexpensive binary metal as the catalyst, resulting in low cost, high operability, wide applicability, and high deuteration rate. It achieves a low-cost and efficient deuteration technology for heterocyclic aromatic hydrocarbons, overcoming the limitations of current heterocyclic aromatic hydrocarbon deuteration technologies.

The invention discloses a low-cost high-stability hydroquinone hydrogenation catalyst and a preparation method thereof. The catalyst comprises the following components: an active component, a carrier, a sintering aid, a pore forming agent and a lubricant, the active component is any one of Ni, Co, Zn, Fe and Cu; the carrier is SiC; the sintering aid is any one or more of Al2O3 (aluminum oxide), SiO2 (silicon dioxide), Y2O3 (yttrium oxide) and silicon-aluminum-based clay; the pore-forming agent is any one or more of bamboo charcoal, silica sol, starch and carboxymethyl cellulose; and the lubricant is glycerol. The invention also provides a preparation method of the low-cost high-stability hydroquinone hydrogenation catalyst. According to the catalyst and the preparation method thereof provided by the invention, the prepared silicon carbide loaded multi-metal catalyst has good thermal conductivity, good chemical stability and excellent mechanical properties, and the problems of carbonization and sintering caused by loss of active components of the catalyst and slow heat transfer of the catalyst are greatly reduced.

The application belongs to the technical field of catalysts, and provides a catalyst for preparing DMT monomers through PET methanolysis, and a preparation method and application thereof. x The Nb3In / NbO-Al2O3 catalyst is prepared by co-precipitation of a mixed metal salt solution composed of niobium salt, indium salt and aluminum salt in the presence of a precipitant to obtain an Nb / In / Al-LDH precursor, and then reduction under the action of hydrogen to obtain the Nb3In / NbO-Al2O3 catalyst. x The Nb3In / NbO-Al2O3 catalyst is prepared by co-precipitation of a mixed metal salt solution composed of niobium salt, indium salt and aluminum salt in the presence of a precipitant to obtain an Nb / In / Al-LDH precursor, and then reduction under the action of hydrogen to obtain the Nb3In / NbO-Al2O3 catalyst. The catalyst can realize a DMT yield of >99% in the reaction of preparing DMT monomers through PET methanolysis under normal pressure conditions, can be recycled for multiple times, has good structural stability and repeated use performance, and has good potential for scale-up preparation and molding application.