55results about How to "Avoid high temperature sintering" patented technology

The invention discloses a catalyst for purifying automobile exhaust and a preparation method of the catalyst. The catalyst belongs to the technical field of environmental-protection catalysis. The catalyst is an integrated catalyst comprising a carrier and a coating. The coating is of a double-layer structure, wherein the first layer is formed by directly coating alumina and an assistant on the carrier; the second layer is formed by coating the alumina, the assistant and a mesoporous material on the first coating; and the mesoporous material comprises one or more mesoporous characteristic catalysts. The catalyst is low in cost and higher in catalyzing activity, and can greatly reduce pollutants generated in emission of the automobile exhaust such as nitric oxide, carbon monoxide and hydrocarbon carbon, so that the emission of an automobile meets a national standard (GB 18285-2005), and therefore, a purpose of protecting the environment can be achieved.

The invention relates to a perovskite solar cell structure which sequentially comprises a cathode transparent conducting substrate, an electron transport layer, a perovskite layer, a hole transport layer and a metal anode. The electron transport layer is a titanium dioxide-coated metal particle core-shell layer. TiO2 coats the Au/Ag core-shell layer to directly serve as the electron transport layer, a special electron transport layer does not need to be manufactured additionally, and a preparation process is simplified. Light absorption by the perovskite layer is promoted by utilizing a plasmon enhancement effect of nano particles, and the light absorption effect of a solar cell is improved. According to the preparation method, the electron transport layer is prepared by adopting a solvent low-temperature process, the use of the steps such as high-temperature sintering in the prior art is avoided, the preparation process is further simplified, and the production cost is reduced. Due to the fact that TiO2 coats the metal particle core-shell layer to serve as the electron transport layer to be directly formed on the cathode transparent conducting substrate in solution rather than be formed through a spin coating process, the structure is more compact, and the electron transport effect is better.

The invention discloses a flexible and transparent conductive thin film and a preparation method thereof. The structure of the flexible and transparent conductive thin film is characterized in that transparent and flexible plastic is used as a substrate, and a surface-modified graphene layer, a metal nanowire layer and a conductive polymer layer are sequentially arranged from bottom top. The preparation method comprises the following steps of 1) preparing a graphene oxide dispersing liquid, adding dopamine for oxidation polymerization reaction, and removing a product which does not react aftercompletion to obtain dopamine-grafted graphene; 2) respectively preparing a dopamine-grafted dispersing liquid and a metal nanowire dispersing liquid which are sequentially marked as a first dispersing liquid and a second dispersing liquid, and adding a conductive doping agent into a conductive polymer solution to obtain a first solution; and 3) sequentially attaching the first dispersing liquid,the second dispersing liquid and the first solution onto the substrate layer by layer, and performing drying to obtain the flexible and transparent conductive thin film. According to the method, thebonding strength between the conductive layer and the flexible plastic layer is improved by a graphene surface layer winkle structure and the adhesion of the polydopamine, meanwhile, a high-temperature condition is not needed, and the flexible plastic substrate cannot be damaged.

The invention belongs to the technical field of solid-state battery materials, and particularly relates to a method for reducing grain boundary impedance and interface impedance of an oxide electrolyte. The method is characterized in that a halide electrolyte membrane is formed on the surfaces of oxide electrolyte particles or the surfaces of electrode particles. The crystal grain interface of theoxide electrolyte particles is modified by the halide electrolyte, so that the grain boundary impedance can be effectively reduced, and the aim of preparing the oxide solid electrolyte sheet by adopting a room-temperature cold pressing technology is fulfilled; the halide electrolyte membrane plays a role in bonding grain boundaries of particles and providing ionic conductance, so that the oxide solid electrolyte sheet can be prevented from being prepared by high-temperature sintering, and the obtained oxide-halide composite electrolyte sheet has very high ionic conductance. Similarly, the halide electrolyte is used for modifying the electrode particles so as to modify the interface of the active electrode material and the oxide solid electrolyte sheet, so that the active electrode material and the oxide solid electrolyte sheet are in close contact, the interface impedance is effectively reduced, and the obtained solid-state battery can normally work at room temperature and release good electrochemical performance.

The invention relates to a device for crushing and grinding uranium ores through assistance of 915MHz pulse microwave irradiation and a control method. The device comprises five main parts of: a 915MHz microwave source generator, a microwave circulator, a water load, wave guide tubes and a microwave resonant heating cavity. After the uranium ores are irradiated by high-power pulse microwave emitted by the device, the mechanical strength of the uranium ores is reduced, the dissociation degree of the uranium ores is increased, and the crushing and the grinding of the uranium ores and the leaching of uranium minerals are facilitated. Compared with traditional continuous microwave irradiation, the pulse microwave irradiation is lower in consumption and better in assistance of the crushing and grinding effect, and can effectively prevent high-temperature sintering.

The invention discloses a preparation method of a synthetic gas methanation catalyst. The preparation method is characterized in that a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer, one or more aluminum sources, nickel nitrate and one or more auxiliaries as raw materials undergo a one-step synthesis reaction according to a certain ratio by a solvothermal method to produce a desired product. The preparation method has simple processes. The synthetic gas methanation catalyst obtained by the preparation method has a mesoporous structure and controllable aperture sizes and catalyst particle dispersity, can show good sintering resistance, high activity at a low temperature, stability at a high temperature and high methane selectivity in methanation, and has important application values in synthesis of substitute natural gas and solution of the existing natural gas shortage problem.

The invention discloses a method for preparing metal powder by plasma spheroidizing. The method comprises the following steps of 1) feeding the raw metal powder into a ball mill for grinding, and fully drying; 2) carrying out pre-pumping vacuum treatment on a smelting chamber and an atomizing chamber, and filling inert gas; 3) smelting the metal powder to form a metal melt; and 4 ) atomizing and hydrogenating the metal melt by adopting a double-layer atomizing nozzle to prepare metal powder; 5) after the metal powder is cooled, and collecting the metal powder through cyclone separation; 6) establishing a stable operation argon plasma torch, feeding the metal powder into a core-part high-temperature zone of the plasma torch, and rapidly melting the metal powder to form metal molten drops; and 7) the metal molten drops enter the powder spheroidization chamber, and condensing to form spherical metal powder. According to the method for preparing the metal powder by the plasma spheroidizing, the atomization method and the plasma method are combined, the prepared metal powder is high in loose packing density, and the powder fluidity is obviously improved.

A hollow fiber ceramic membrane production method comprises the following steps: adding polyethersulfone particles into an n-methyl-2-pyrrolidone solution, dissolving to form a polymer solution, adding polyvinylpyrrolidone, and uniformly mixing; slowly adding Fe2O3 and YSZ mixed powder, fully stirring, and preparing a spinning solution; pouring the spinning solution into a stainless steel container, and carrying out vacuum deaeration at room temperature for 2h to remove bubbles dissolved in the stirring process; and spinning by adopting an air gap technology, extruding the spinning solution from a spinning nozzle into an external coagulant aid tap water at a speed of 20-30mm/s under a nitrogen pressure of 0.1MPa under an air gap of 150-300mm, and standing the above obtained hollow fiber ceramic membrane precursor in tap water for 14-34h.

The invention provides a nickel-based oxygen vacancy carrier catalyst as well as a preparation method and application thereof, and belongs to the field of catalytic reforming and diesel hydrogen production. With the catalyst provided by the invention adopted, the problems of low activity, easy coking and poor sulfur resistance of a diesel reforming catalyst can be solved. Cerium dioxide is used asan oxygen carrier; heterovalent metal La is doped in the CeO2 to reduce oxygen vacancy generation energy; the enhancement of the oxygen storage and release capacity of the carrier can inhibit side reactions so as to improve the activity of a main reaction. Diesel oil H/C is low, a large amount of carbon deposits are likely to occur during reforming; when coking occurs, the oxygen vacancy carriercan release more oxygen to oxidize the carbon deposits, so that coking inactivation of the catalyst is avoided. Ni particles are smaller in size and more uniform in distribution, so that the catalyticactivity of the catalyst is improved, and the catalyst can still keep excellent reforming performance after part of active metal sulfur is poisoned; the oxide of lanthanum is mainly distributed on asurface phase, so that high-temperature stability of the catalyst can be improved, and high-temperature sintering of the catalyst carrier is avoided.

The invention discloses a method for deoxidizing a low-concentration oxygen-containing coal bed gas. The method comprises the following steps: preheating a fixed bed deoxidization reactor; feeding the oxygen-containing coal bed gas into the reactor after penetrating through a flame arrester, a preheater and a preheater bypass; carrying out deoxidization reaction when the reaction temperature is 350-650 DEG C, the operation pressure is 0-0.4MPa and the gaseous hourly space velocity is 2,000-20,000h<-1>; feeding a hot deoxidized coal bed gas into the preheater and exchanging heat with a cold oxygen-containing coal bed gas; and feeding the cooled oxygen-containing coal bed gas into a cooler, cooling and dewatering, and feeding to a coal bed gas delivery pipeline. The method has the advantages of being good in safety, good in deoxidization effect, low in investment, convenient to operate and low in operation cost.

The invention belongs to the technical field of optical information storage. A high-density and long-life data storage disk is characterized in that the surface of a glass substrate is covered with a thin film made from hybrid materials or the internal surface of a flat-bottom container is covered with a plate sample made from the hybrid materials; and high-density gold nanorods are dispersed in the hybrid materials. The data storage disk prepared by the method is stable in thermodynamic property and capable of storing recorded data for a long time.

The invention aims at providing a high-performance electric furnace cover. The high-performance electric furnace cover is prepared from the following components in percentage by weight: 18-33 percent of fused alumina zirconia, 15-25 percent of tabular corundum particles, 8-12 percent of electro-fused mullite particles, 3-6 percent of sillimanite particles, 3-8 percent of zincochromite powder, 8-15 percent of calcium aluminate cement, 2-6 percent of alpha-Al2O3 micropowder, 5-8 percent of Fe3Si powder, 4-6 percent of beta-sialon powder and 0.4-0.6 percent of additives. The high-performance electric furnace cover is applicable to an electric furnace environment having a relatively high molten iron blending proportion, has excellent sintering performance, iron slag erosion resistance and thermal shock resistance, and has good peeling resistance in the using process.

The invention relates to the technical field of nano catalysts, in particular to a preparation method of an efficient Co/CNTs catalyst for a Fischer-Tropsch synthesis reaction. The glow discharge plasma is introduced into the preparation of a supported Co/CNTs catalyst to explore the influence of plasma treatment in different inert atmospheres on the Fischer-Tropsch synthesis catalytic performance. Research results show that the Co/CNTs catalyst is treated by the inert atmosphere plasma, the reduction performance is improved while high dispersion of cobalt is kept on the premise that preciousmetal auxiliaries are not added for modification, and higher (3-4 times) Fischer-Tropsch synthesis reaction activity is shown in comparison with the sample obtained through the corresponding traditional roasting method. Particularly, the Co/CNTs catalyst is treated by adopting argon plasma, the catalyst also shows the optimal reaction stability while showing the optimal Fischer-Tropsch synthesis reaction activity and obvious inactivation does not occur in a 100h reaction.

The invention is direct at providing a refractory material used for a cover of an electric furnace. The refractory material comprises, by weight, 18-33% of chromium corundum, 15-25% of tabular corundum granules, 8-12% of electric-smelting mullite granules, 3-6% of sillimanite granules, 3-8% of zincochromite powder, 8-15% of calcium aluminate cement, 2-6% of alpha-Al2O3 micropowder, 5-8% of Fe3Si powder, 4-6% of beta-Theron powder, and 0.4-0.6% of an additive. The refractory material is suitable for an electric furnace with high addition ratio of molten iron, has excellent sintering performance, anti-iron-slag-erosion performance and thermal shock stability, and has good anti-stripping performance during use.

The invention discloses a preparation method of a pure or composite hexagonal boron nitride densified macroscopic body. The preparation method of the pure hexagonal boron nitride densified macroscopic body comprises the following steps of: (1) obtaining a raw material which is hexagonal boron nitride nanosheet powder with a solvent content of 0-10 wt%; and (2) carrying out hot press molding on the raw material in the step (1) at the temperature of 25-500 DEG C to obtain the hexagonal boron nitride densified macroscopic body. The forming temperature of the hexagonal boron nitride macroscopic body can be greatly reduced, and the prepared hexagonal boron nitride densified macroscopic body has the characteristics of high density, high strength, high thermal stability and high chemical stability.

The invention discloses a catalyst for selective catalytic reduction denitration and a preparation method thereof, and the preparation method comprises the following steps: weighing titanium dioxide, adding stearic acid and lactic acid, and uniformly performing stirring and mixing; adding ammonia water, deionized water, glass fiber and broad-leaved tree pulp into the mixed material, adding hot oxalic acid solution of ammonium metavanadate, ammonium paratungstate and ethanolamine into the mixed material, performing mixing, adding acetic acid solution of cerium carbonate and manganese carbonate, performing stirring and mixing, adding calcium silicate and barium sulfate, and adding a carboxymethyl cellulose aqueous solution, ethylene oxide and deionized water; adjusting the pH value of the solution by adopting ammonia water, and shaping, drying and calcining the mixed material after vacuum treatment to obtain the catalyst. The catalyst is reasonable in component, simple in process and controllable in cost, and by adding cerium oxide and manganese dioxide into the vanadium-titanium-tungsten-based denitration catalyst, the SO2 conversion rate of the vanadium-based catalyst is reduced, the use temperature range of the vanadium-based catalyst is widened, and the denitration efficiency of the catalyst under the low-temperature effect is improved.