400 results about "Mixed metal" patented technology

The invention discloses a composite aluminum plate with an embedded mixed melting layer microstructure and a cast-rolling preparation method of the composite aluminum plate, and belongs to the technical field of aluminum alloy material preparation, the composite aluminum plate comprises a coating aluminum alloy, a matrix aluminum alloy and an embedded brazing flux mixed melting layer, the coating aluminum alloy is connected with the matrix aluminum alloy through the embedded brazing flux mixed melting layer, and the matrix aluminum alloy is connected with the embedded brazing flux mixed melting layer. The pre-embedded brazing flux mixed melting layer is a controllable mixed metal layer formed by mixing pre-embedded brazing flux metal and a fusion layer formed by a solid-liquid cast rolling process, the cast rolling preparation method is a coating-cast rolling combined preparation method, and the method has the advantages of being short in process, high in production efficiency, high in pre-embedded layer control precision and the like, and large-scale production of products is facilitated.

Acrolein is produced by selectively oxidizing allyl alcohol over a first mixed metal oxide catalyst in the presence of oxygen in the vapor phase. The first mixed metal oxide catalyst comprises oxides of molybdenum and bismuth. Acrylic acid is produced by selectively oxidizing the acrolein over a second mixed metal oxide catalyst in the presence of oxygen in the vapor phase. The second mixed metal oxide catalyst has a different composition from the first mixed metal oxide catalyst.

The invention discloses an ultrahigh-temperature multi-element iridium alloy material and a preparation method thereof, and belongs to the technical field of alloy materials. The iridium alloy material comprises the following elements in percentage by mass: 53 to 58.5 percent of Ir, 40 percent of Ta, 0.5 to 2 percent of Y and 1 to 5 percent of Re. The preparation method of the iridium alloy material comprises the following steps: weighing Ir, Ta, Y and Re metal powder in proportion and uniformly mixing; blank pre-pressing treatment is conducted on the evenly-mixed metal powder, the metal powder is die-cast into a block, and a pressed blank is obtained; the pressed blank is smelted through an electric arc smelting method, and an iridium alloy crude product is obtained after smelting is finished; and the smelting is repeated for more than 7 times, so that the pressed blank is uniformly smelted, the content of each component reaches the standard, and the iridium alloy material is prepared. According to the iridium alloy material, through the synergistic effect of multiple elements and the preparation technology, the triple effects of structural distortion strengthening, high-temperature stability and oxidation film integrity are achieved. And due to the high mixed entropy, a similar high-entropy alloy structure is formed, the high-temperature oxidation resistance is remarkably improved, and the alloy is suitable for various ultra-high-temperature environments.

The invention provides a core-shell type rare earth gradient doped positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: introducing a mixed metal source solution and a first complexing agent into a mixed solvent, carrying out solvothermal reaction to obtain a core precursor, then continuously heating to a first temperature, introducing a rare earth doped source solution, and carrying out solvothermal reaction to obtain a core precursor; continuously raising the temperature to a second temperature for heat preservation, and finally quenching to obtain a precursor material; and mixing and sintering a lithium source and the precursor material to obtain the core-shell type rare earth gradient doped positive electrode material. According to the preparation method, coprecipitation reaction kinetics and a gradient locking process are synchronously regulated and controlled through a mixed solvent system, composition segregation is avoided, lattice distortion is triggered by adopting a solvothermal system, gradient doping of rare earth elements is induced, the interface mutation defect of a traditional core-shell structure is broken through, and the performance of the core-shell structure is improved. And synchronous improvement of high specific capacity and ultra-long cycle life is realized synergistically.

The invention discloses a flux-based preparation method of metal organic gel, which is characterized in that a series of metal organic gel materials are prepared by controlling proportion and temperature by taking ferric salt and any other mixed metal salts and organic ligands as raw materials, and the metal organic gel materials are directly used as an anode catalyst of a methanol fuel cell. The synthesis method is simple, the reproducibility is good, batch production can be achieved, and the prepared metal organic gel has the excellent methanol fuel cell anodic oxidation performance.

The present invention provides a powder drop device for metal composite materials, a binder jet printing method, and a metal composite material. [Solution] The powder dropping device for metal composite materials includes a movable powder cylinder, a powder hopper, and a planar moving device. The powder cylinder is provided with at least one powder hopper, which is used to mix two different metal powders. The two different metal powders are mixed in a gradient manner by controlling the powder hopper's feed rate. The powder hopper is provided with a planar moving device for moving the plane of the powder outlet of the powder mixer. The movement of the powder layer is controlled, and the planar moving device changes the position of the powder outlet of the powder mixer, thereby achieving a spatial gradient change of the mixed metal powder. The present invention enables the production of metal composite parts with component gradients and structural gradients for binder jet printing.

The invention discloses a method for preparing a carbon-coated cobalt-cerium composite material by using rapid Joule heat, and belongs to the technical field of catalytic materials and hydrogen production by electrolyzing water. The method comprises the following steps: dissolving a cobalt source and a cerium source in a solvent to obtain a mixed metal salt precursor solution, and then uniformly dipping or dropwise adding the mixed metal salt precursor solution onto a cellulose-based porous carbon source precursor to obtain a supported precursor; and finally, placing the load type precursor at two ends of an electrode of a Joule thermal reaction device, and under a vacuum condition, applying instantaneous current to carry out Joule thermal shock treatment so as to prepare the CoCe-C composite material. The preparation process is extremely simple, the energy consumption is extremely low, expensive precious metal and complex equipment are not needed, the obtained CoCe-C material serves as an anode catalyst to be applied to a hydrazine oxidation auxiliary water electrolysis system, the excellent catalytic activity and stability are shown, the voltage of an electrolytic bath can be remarkably reduced, low-energy-consumption, efficient and safe hydrogen production is achieved, and the method is suitable for industrial production. Wide industrial application prospects are realized.

The invention provides a metal-doped biomass carbon negative electrode material and a preparation method thereof.The preparation method comprises the steps that an acid activating agent is added into biomass powder for soaking, then a pore inducer is added for high-temperature activating treatment, and activated porous carbon is obtained; preparing a mixed metal salt solution, adding the activated porous carbon into the mixed metal salt solution, sequentially stirring and standing, and performing suction filtration and drying to obtain an intermediate; and putting the intermediate into a vapor deposition reaction cavity, heating under the protection of nitrogen, introducing a silicon source gas and a germanium source gas for a deposition reaction, and cooling after the deposition reaction is completed to obtain the metal-doped biomass carbon negative electrode material. According to the process, through collaborative integration of structural design and element functions, the comprehensive electrochemical performance of the metal-doped biomass carbon negative electrode material is remarkably improved, and the problem that a traditional doped material is insufficient in stability and capacity utilization rate is solved.

The invention discloses corrosion-resistant aerogel and a processing technology thereof.The processing technology comprises the following steps that graphene oxide dispersion liquid and a metal organic framework precursor ZIF-67 are mixed, metal salt is cobalt salt, the mass ratio of graphene oxide to metal salt is 1: 0.5-1: 2, and homogeneous sol is formed through ultrasonic treatment. After the composite aerogel is soaked in strong acid HCl with the pH value of 1 and strong alkali NaOH with the pH value of 14 for 7 days, the mass loss rate is smaller than 5%, meanwhile, the porosity is kept to be larger than or equal to 95%, the compressive strength is kept to be larger than or equal to 1.5 MPa, and the industrial problems that traditional aerogel collapses in a structure and degrades in performance in a corrosive medium are solved.

The invention relates to a process for the production of ethylene by oxidative dehydrogenation (ODH) of ethane, comprising: a) supplying ethane and oxygen to a first ODH zone which is formed by multiple reactor tubes containing a mixed metal oxide ODH catalyst bed; b) contacting the ethane and oxygen with the catalyst resulting in multiple effluent streams, wherein the multiple reactor tubes are cooled by a coolant; c) mixing at least a portion of the multiple effluent streams from step b) resulting in a mixture comprising ethylene, unconverted ethane and unconverted oxygen; d) supplying at least a portion of the mixture from step c) to a second ODH zone containing a mixed metal oxide ODH catalyst bed; e) contacting at least a portion of the mixture from step c) with the catalyst in the second ODH zone resulting in a stream comprising ethylene and unconverted ethane.

The application relates to a sodium-intercalated composite hydroxide and a secondary battery positive electrode material, and a sodium composite hydroxide preparation method which comprises the following steps: S1, mixing water, a complexing agent, a precipitant, an optional additive and a mixed metal solution to perform a coprecipitation crystallization reaction, performing solid-liquid separation after the reaction, and obtaining a hydroxide precursor; S2, adding the hydroxide precursor obtained in S1, a sodium metal solution and an oxidizing agent into a pipeline reactor, wherein the molar ratio of the hydroxide precursor to sodium ions in the sodium metal solution is 10:(0.5-5), the reaction temperature in the pipeline reactor is controlled to be 110-300 DEG C, the reaction pressure is 1.0-10 MPa, the continuous reaction is performed for 0.5-20 hours, the pipeline reactor is discharged after the continuous reaction, the solid-liquid separation is performed on the obtained material liquid, the solid phase is obtained, the solid phase is dried, and a sodium-intercalated composite hydroxide is obtained. The sodium-intercalated composite hydroxide is subjected to heat treatment to form a solid solution, is further calcined to form a secondary battery positive electrode material, and the uniformity, stability and cycle performance of the material are improved.

The well mouth electromagnetic heating device comprises a shell, the shell is of a hollow structure, an insulating layer is fixedly installed on the inner wall of the shell, a spiral electromagnetic induction coil is fixedly installed on the inner wall of the insulating layer, an inner ring of the electromagnetic induction coil is installed on a heat preservation layer in a winding mode, and a heating tank is fixedly installed on the inner wall of the heat preservation layer. The stirring column and the metal rod rotate along with the rotating rod to stir liquid in the heating tank, so that different parts of the liquid are fully mixed, the metal rod generates induction heat under the action of a magnetic field, the heat can be diffused in the liquid more quickly and uniformly, the phenomenon of temperature stratification is avoided, and the heating uniformity is further improved. Cleaning liquid is injected into the first channel of the rotating rod through the connector, the cleaning liquid is sprayed out of the nozzle through the second channel, the sprayed cleaning liquid comprehensively cleans the interior of the heating tank, meanwhile, the scraping plate can scrape the inner wall of the heating tank in the stirring process, and impurities or precipitates in the liquid are prevented from being attached to the inner wall.

The application provides a ternary mixed metal organotin supertetrahedral chalcogenide cluster crystal state for resin catalysts and a synthesis method and application thereof. The chalcogenide cluster compound comprises at least a core and a periphery, the core comprises metal ions, and the periphery comprises organotin; the core and the periphery form a cluster structure; and the molecular general formula of the chalcogenide cluster compound is (RSn)4M4M'2S 16 wherein R is selected from n-butyl (nBu) and / or phenyl (Ph); M is selected from In or Ga; and M' is selected from Zn, Cd, Mn and Co. The synthesis method of the application has low requirements on the purity of raw materials, simple process, and the crystal state is easy to repeat, convenient for production. The yield of the chalcogenide cluster crystal state obtained by the synthesis method of the application can reach more than 45%. The chalcogenide cluster compound of the application can be used in the fields of photoelectric catalysis and nonlinear optics.

The application provides a porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction and a preparation method. The preparation method comprises the following steps: adding 4,4-diamino diphenyl ether and pyromellitic dianhydride into a solvent, uniformly mixing, and preparing a polyamide acid precursor spinning solution; electrospinning the prepared polyamide acid precursor spinning solution to prepare polyamide acid nanofibers; immersing the prepared polyamide acid nanofibers in a mixed metal salt solution containing cobalt salt, lanthanum salt and zinc salt to prepare polyamide acid nanofiber precursors loaded with metal ions; and performing programmed temperature heat treatment on the prepared polyamide acid nanofiber precursors loaded with metal ions in a protective atmosphere to prepare the porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction. The prepared porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction has excellent electrochemical oxygen reduction reaction and oxygen evolution reaction bifunctional catalytic activity.

The application discloses a preparation method of a binary transition metal aluminide nanocatalyst and application thereof. First, a mixed metal salt solution is mixed with an ammonium carbonate solution to obtain a metal oxide precursor through co-precipitation. Then, the oxide precursor is mixed with a low-temperature composite molten salt and is subjected to thermal reduction under a specific atmosphere. Through simple post-processing, a single-phase binary transition metal aluminide nanocatalyst with high catalytic activity is obtained. The non-noble metal aluminide nanocatalyst prepared is applied to a reaction of catalytically selectively hydrogenating acetylenes to prepare olefin compounds. Under mild conditions, 99% conversion of reactants is achieved while maintaining 96% olefin selectivity. Compared with a traditional supported catalyst, the metal aluminum atom greatly regulates the electronic and geometric structures of the transition metal atom, effectively improves the catalytic activity, and significantly improves the structural stability of the catalyst. The material has high phase purity, is easy to separate and recycle, and has good application prospect.

The invention provides a precursor containing primary particles distributed in the radial direction and a preparation method and application thereof.The preparation method comprises the steps that a mixed metal source solution, a complexing agent solution and a precipitator solution are subjected to a first coprecipitation reaction, and a core is obtained; in oxygen-free protective gas, increasing the flow of the mixed metal source solution, the complexing agent solution and the precipitator solution, and carrying out second coprecipitation reaction to obtain a core coated with a compact layer; in an oxygen-containing atmosphere, introducing the mixed metal source solution, the complexing agent solution, the precipitator solution and the doped metal source solution, and carrying out a third co-precipitation reaction to obtain a precursor; the pH and complexing agent concentration of the third co-precipitation reaction are smaller than those of the second co-precipitation reaction and are smaller than those of the first co-precipitation reaction. According to the preparation method, the precursor comprises the primary particles distributed along the radial direction by regulating and controlling the conditions of the coprecipitation reaction at each stage, so that the performances such as circulation and rate of the positive electrode material are improved.

The invention provides a preparation method of a flaky magnesium-based material, and relates to the technical field of magnesium-based material preparation. The preparation method of the flaky magnesium-based material comprises the following specific steps that S1, firstly, magnesium powder, manganese powder, zinc powder, carbon nano tube powder, stearic acid and cerium oxide powder are evenly added into a ball mill to be subjected to ball milling treatment, and inert gas is introduced for protection in the grinding process; s2, mixed powder obtained after ball milling treatment in S1 is put into ultrasonic mixing equipment to be mixed; and S3, the mixed metal powder is put into a mold, and pressing forming is carried out. In the process of preparing the magnesium-based material, a passivation film can be formed on the magnesium surface, electrochemical corrosion is inhibited, magnesium alloy grains are refined, and the mechanical property is improved by adding cerium oxide, cerium oxide powder, aluminum triphosphate powder and epoxy resin are prepared into mixed slurry, and the mixed slurry is sprayed on the surface of the flaky magnesium-based material. The corrosion resistance of the flaky magnesium-based material can be improved, and the service life is prolonged.

An optical device (200, 300) comprising the following: a substrate (201,301); a heterogeneous metal oxide semiconductor MOS capacitor formed on the substrate, wherein the MOS capacitor comprises: an optical fiber (202, 302); a first cathode (204, 304) comprising a first material in which an optical waveguide is formed; an anode (206, 306) formed in the optical waveguide, the anode comprising a second material that differs from the first material; and a dielectric (218, 318) arranged between the first cathode and the anode, wherein the dielectric comprises an oxide of the first material and an oxide of the second material, where the heterogeneous MOS capacitor is defined between the anode and the first cathode; and a semiconductor component layer that is arranged between the substrate and the heterogeneous MOS capacitor and is formed in the optical waveguide, characterized by the fact that The semiconductor component layer and the anode form a resistance element that is integrated into the optical waveguide.

A method for producing mixed metal salts containing manganese ions and at least one of cobalt ions and nickel ions, the method including: an Al removal step of subjecting an acidic solution containing at least manganese ions and aluminum ions, and at least one of cobalt ions and nickel ions, to removal of the aluminum ions by extracting the aluminum ions into a solvent, the acidic solution being obtained by subjecting battery powder of lithium ion batteries to a leaching step; and a precipitation step of neutralizing an extracted residual liquid obtained in the Al removal step under conditions where a pH is less than 10.0, to precipitate mixed metal salts comprising a metal salt of manganese and a metal salt of at least one of cobalt and nickel.

This utility model relates to the field of metal processing technology, specifically to a drying and temperature measuring device for metal mixture briquetting and rolling products. It includes a housing and a placement mechanism. The placement mechanism includes two limiting components, a support plate, a connecting plate, a sliding block, a lead screw, and two first electric push rods. The two limiting components are respectively disposed on both sides of the housing, and the connecting plate is disposed between the two limiting components. The support plate is rotatably connected to the two limiting components, the sliding block is fixedly connected to the connecting plate, the lead screw is rotatably connected to the housing, and the lead screw is threadedly connected to the sliding block. One end of each of the two first electric push rods is rotatably connected to the connecting plate, and the other end is rotatably connected to the support plate, and they are respectively disposed on both sides of the lead screw. This structural design solves the problem in the prior art where it is inconvenient to place or collect the dried mixed metal, thus affecting work efficiency.

This invention provides a high-entropy doped composite sodium iron pyrophosphate cathode material, its preparation method, and a battery. The preparation method includes: passing a mixed metal source solution, a phosphorus source mixture, an oxidant solution, and a complexing agent solution into a base liquid to perform a co-precipitation reaction to obtain a precursor material; the mixed metal source solution includes an ferrous source, a nickel source, a cobalt source, a manganese source, a chromium source, and additives, wherein the additives include sodium alginate and / or sodium carboxymethyl cellulose; the precursor material, the sodium source, and the carbon source are sequentially mixed, spray-dried, and sintered to obtain the high-entropy doped composite sodium iron pyrophosphate cathode material. The preparation method of this invention introduces multiple metal elements, additives, and complexing agents during the co-precipitation reaction, enabling multiple metal elements to be uniformly doped into the crystal structure of the material. This utilizes the synergistic effect of high-entropy multiple factors to enhance the structural stability of the material, optimize electron / ion transport dynamics, and improve cycle and high-rate performance.

The utility model discloses a kind of high-efficiency stirring head devices for copper-aluminum alloy dissimilar alloy welding, belong to welding stirring tool technical field, including rotary friction tool, shaft sleeve and stirring needle, machine tool is driven handle rotation, in turn drive rotary friction tool high-speed rotation.And the end of rotary friction tool is provided with shaft shoulder, the center of shaft shoulder inserts stirring needle, stirring needle is coaxial transmission connection with rotary friction tool, to drive stirring needle rotation by rotary friction tool, and the end of shaft sleeve is provided with compact smoothening mouth, in welding process, the compact smoothening mouth of shaft sleeve can be flattened and compacted to plasticized metal material, and ensure that metal material surface is flat.And shaft sleeve side is provided with discharge port, and excess plastic mixed metal material is discharged from discharge port in welding process, simultaneously, airflow is outwardly radiated by convection tank, to inhibit rotary friction tool temperature rise, to relieve the effect of rotary friction tool and stirring needle heat deformation.

The utility model provides a novel oil pan for a tractor and an engine, and belongs to the technical field of tractors, the novel oil pan comprises an oil pan body, the bottom of the inner cavity of the oil pan body is provided with an arc-shaped oil groove, the bottom of the arc-shaped oil groove is provided with a chipping counter bore, and an oil discharge pipe is obliquely arranged in the chipping counter bore; and the oil drain plug screw is screwed into the oil drain pipe. When the engine oil is replaced, the metal and non-metal scraps in the arc-shaped oil groove can gradually enter and precipitate into the scrap counter bore, when the engine oil is replaced, the engine oil can be discharged from the oil discharging pipe to the maximum extent, the metal and non-metal scraps in the scrap counter bore can be discharged from the oil discharging pipe, oil liquid residues are reduced, and the service life of the engine oil is prolonged. And metal and nonmetal mixed chippings are prevented from being retained at the bottom of the oil pan body, and moving parts are prevented from being abraded by the residual chippings.

The invention relates to a chopped fiber reinforcement-based modularized paddle main beam structure and a manufacturing method, and relates to the technical field of aircraft parts, the chopped fiber reinforcement-based modularized paddle main beam structure comprises a main beam body used for supporting a paddle, the main beam body is composed of a plurality of module units, the module units are made of chopped fiber reinforced composite materials, and the interior of each module unit is of a hollow structure; the gradient supporting pieces are arranged in the module units, each gradient supporting piece comprises a vertical strip and a transverse supporting strip, the vertical strips and the transverse supporting strips are arranged in a density stepped change mode, and the density of the ends, close to the connecting ends, of the vertical strips and the transverse supporting strips is large; according to the gradient supporting piece, the density stepped change design is adopted, high-fiber-content metal powder or metal powder mixed with the high-fiber-content metal powder is adopted close to the connecting end, and the rigidity, the abrasion resistance and the bolt pre-tightening force resisting capacity are improved; and the middle part adopts a low-density core material for weight reduction, so that the bending rigidity is kept while the overall weight is reduced, and the balance of light weight and high strength is realized.

A process for upgrading a pyrolysis oil comprising contacting a pyrolysis oil feed with hydrogen in a first fixed bed reactor in the presence of a mixed metal oxide catalyst wherein: the pyrolysis oil feed comprises a polycyclic aromatic hydrocarbon compound comprising greater than or equal to 16 carbon atoms; and contacting the pyrolytic oil feedstock with hydrogen in the presence of a mixed metal oxide catalyst in a first fixed bed reactor to convert at least a portion of the polycyclic aromatic hydrocarbon compounds in the pyrolytic oil feedstock into bicyclic aromatic hydrocarbon compounds, tricyclic aromatic hydrocarbon compounds, or both, passing the intermediate stream comprising the bicyclic aromatic compound, the tricyclic aromatic compound, or both to a second fixed bed reactor downstream of the first fixed bed reactor; and contacting the intermediate stream with hydrogen in the presence of a mesoporous supported metal catalyst in a second fixed bed reactor.

The invention discloses a lithium manganese iron phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium batteries. Through an integrated process of magnetic field-gradient coprecipitation + in-situ lithium doping-spray drying-segmented calcination, Fe3O4 magnetic seeds are added into a mixed metal solution, magnetic field induction is combined, pH is precisely controlled to be gradually reduced from 9 to 8 in cooperation with a triammonium citrate solution, and meanwhile, a magnetic seed-carbon layer dual conductive network is constructed; compared with the prior art, the preparation method has the advantages that the precursor dispersity, grain orderliness and purity of the lithium manganese iron phosphate positive electrode material are improved, the Li < + > migration path and electron conduction efficiency are optimized, the 5C discharge specific capacity of the material reaches 121-132mAh / g, the 500-time cycle capacity retention rate reaches 90.3-94.1%, and the first charge-discharge efficiency reaches 95.5-97.2%.

The present invention relates to AB2O4 type mixed metal oxide catalyst system having spinel / inverse spinel structure with support. The present invention also relates to the process for preparation of mixed metal oxide catalyst system. More particularly, the present invention relates to a process for the partial oxidation of alkanes to value added products and corresponding oxygenates by using said AB2O4 type mixed metal oxide catalyst with support(s).

This invention discloses a thermal shock-induced catalytic electrode, its preparation method, and its application in wastewater treatment, belonging to the field of wastewater treatment technology. The catalytic electrode comprises a titanium metal substrate and a mixed metal oxide catalytic layer formed on the surface of the titanium metal substrate. The mixed metal oxide catalytic layer has a hydroxylation-rich surface, high specific surface area, and large pore volume, and its microstructure is a uniform mud-crack-like porous structure containing nanoscale grains. The preparation method includes first laser shock strengthening of the titanium metal substrate to form a mesoscale array structure; then loading the mixed metal oxide precursor using an immersion-pulling-space flow method; subsequently performing annealing; rapidly immersing the annealed electrode in a hydrogen peroxide solution for thermal shock quenching; and finally performing low-temperature tempering to eliminate internal stress and reduce resistance. The catalytic electrode of this invention achieves a balance between catalytic activity, conductivity, and stability, and its preparation process is simple and easy for large-scale industrial production.

This invention relates to the field of gear performance testing technology, and more particularly to a gear performance testing system based on mixed metal powder pressing molding, comprising: a testing machine, which includes a rotating component and a support; a defect information acquisition module, including an eddy current probe for acquiring the induced electrical signal generated when the gear under test interacts with an alternating magnetic field and a purging component; a detection module for acquiring the vibration value of the eddy current probe and the dust concentration at a dust concentration sampling point below the eddy current probe; and a control module for determining the current rise slope of the alternating current based on the vibration difference, determining the vertical height of the support based on the overlap between the dust-containing area on the surface of the gear under test during the uniform rotation phase and the corresponding fixed area, and determining the purging duration of the purging component based on the decrease in dust concentration in the dust-containing area within a unit dust monitoring cycle. This invention improves the accuracy of gear performance testing.

The present invention relates to AB2O4 type mixed metal oxide catalyst system having spinel / inverse spinel structure with support. The present invention also relates to the process for preparation of mixed metal oxide catalyst system. More particularly, the present invention relates to a process for the partial oxidation of alkanes to value added products and corresponding oxygenates by using said AB2O4 type mixed metal oxide catalyst with support(s).