69results about How to "No need for high temperature calcination" patented technology

The invention discloses a preparation method of supported rare earth doped manganese dioxide (MnO2) used in an ozone catalyst. The method comprises the following steps: taking gamma-Al2O3 as a carrier, taking MnO2 as an active constituent of the catalyst, and taking rare earth element as an additive, dissolving manganese sulfate and rare-earth metal nitrate in deionized water, adding isopropyl alcohol, stirring, mixing the carrier in the solution obtained after stirring, continuing stirring uniformly, heating, adding a KMnO4 solution, carrying out an in situ oxidation-reduction reaction on the surface of the carrier to obtain the rare earth doped MnO2 modified gamma-Al2O3. The method has the advantages that the preparation technology is simple; the catalyst is low in cost; the performance is stable; the ozonolysis efficiency is high; the application prospect is broad.

The invention discloses a fly ash and building waste water permeable brick and a preparation method thereof, and belongs to the technical field of building materials. The fly ash and building waste water permeable brick is prepared from, by weight, 100 parts of fly ash, 200-800 parts of building waste, 2-8 parts of silica fume, 1.5-6.5 parts of alkali-activator and 18-36 parts of water. According to the fly ash and building waste water permeable brick and the preparation method thereof, industrial waste residues and building waste are adopted as the raw materials, the solid waste utilization rate is high, and the production cost is low; the molding method adopts compression molding and is simple in technology, free of high-temperature calcination, low in carbon, environmentally friendly and low in energy consumption; a cementing material is an alkali-activator powder coal ash cementing material, and the water permeable brick prepared through the alkali-activator powder coal ash cementing material has the advantages of being high in strength, high in water permeability, low in hydration heat, resistant to carbonization, good in durability and the like.

The invention relates to an anode electrocatalyst for a direct borohydride fuel cell and a method for preparing the same, in particular to a method for preparing a porous carbon loading nanometer gold catalyst. The preparation method comprises that: by adopting the metal sol loading method, the surface of the porous carbon carrier after purification and surface oxidizing treatment is loaded with a nanometer gold particle, and the size of the gold particle can be controlled by controlling the adding amount of a reducing agent and the gold concentration in the metal sol. The loading capacity of the gold is 5 to 30 percent, and the particle size of the gold is 2 to 6nm. The porous carbon is one of or a mixture of more than one of carbon nanometer pipe, carbon nanometer fiber, active carbon fiber, graphitized carbon black, active carbon and intermediate phase carbon microsphere, and the specific surface area of the carrier is between 100 and 2,000m / g. The method has the advantages of simple preparation process, unnecessary high-temperature calcination, and easy mass production. The prepared gold particle has the advantages of high-degree dispersion on the surface of the carbon carrier and even size distribution. When used as the anode electrocatalyst of the direct borohydride fuel cell, the anode electrocatalyst has good BH4 electric oxidation catalysis activity.

The invention discloses water-permeable bricks prepared from coal gangues and construction waste and a preparation method thereof and belongs to the technical field of building materials. The water-permeable bricks are prepared from, by weight, 100 parts of coal gangues, 200-800 parts of construction waste, 5-10 parts of silica fume, 1.8-7 parts of alkaline excitant and 18-36 parts of water. The raw materials are industrial waste and construction waste, the solid waste utilization rate is high, and the production cost is low. The water-permeable bricks are formed through pressing and are low in carbon, environmentally friendly and low in energy consumption, the process is simple, and high temperature calcination is not needed. A cementing material is an alkali-activated coal gangue cementing material, so that the water-permeable bricks prepared adopting the cementing material have the advantages of being high in strength, high in water permeability, low in hydration heat, resistant to carbonation, good in durability and the like.

The invention discloses a preparation method of an iron sesquioxide-bismuthylcarbonate composite light catalyst, and belongs to the technical field of novel material preparation. A low-temperature hydrothermal method is adopted, iron-based gel is adopted as a precursor, Fe2O3 is introduced on the surface of bismuthylcarbonate in one step, and the composite light catalyst is formed. The problem that the composite light catalyst is hard to synthesize is solved, and the iron sesquioxide-bismuthylcarbonate composite light catalyst is successfully prepared. On the basis of the simple sol-gel soaking method, no surface active agent or template agent is added, high temperature calcination is not needed, the technology is simple, the preparation process is easy to control, water is adopted as the reaction solvent, and obtained nanoparticles are uniform in distribution.

The invention relates to a multi-solid-waste large-mixing-amount non-fired water permeable brick and a preparation method thereof, and belongs to the field of building material preparation, the multi-solid-waste large-mixing-amount non-fired water permeable brick comprises the following components in proportion: 45%-50% of steel slag, 10%-20% of coal gangue, 8%-15% of desulfurized gypsum, 10-20% of aggregate, 8%-10% of water and 1%-3% of water reducing agent, wherein the aggregate is composed of iron mine waste rock and building waste at 1:1. A large amount of solid waste is adopted as the rawmaterial, the ecological pressure can be reduced while the cost is saved, the solid waste utilization rate is increased, energy is greatly saved in an unfired mode, the activity of the raw material is improved through mechanical grinding, the activity of steel slag can be stimulated through addition of coal gangue and desulfurized gypsum, and the permeable strength and wear resistance are improved.

The invention discloses a method for preparation of lithium tantalate nano-powder by a hydrothermal process. The method includes: using deionized water as a reaction solvent, adding a lithium source and a tantalum source, ensuring the mole ratio of tantalum ions to lithium ions at 1:(1-8), carrying out reaction for 8-24h in an autoclave, keeping the reaction temperature at 200-260DEG C, and at the end of the reaction, firstly conducting washing by deionized water, and then performing washing by an alcohol solvent, thus obtaining the lithium tantalate nano-powder. The lithium source is LiOH or Li2CO3, and the tantalum source is Ta(OH)5 or Ta2O5. The method provided by the invention adopts different lithium sources and different tantalum sources as the raw materials, and takes deionized water as a reaction solvent to synthesize the LiTaO3 nano-powder. The prepared LiTaO3 powder has a regular shape, fine, complete and uniform grains, high purity, no aggregation or less agglomeration, and has no need for high-temperature calcination treatment. The method provided by the invention has the advantages of fewer steps, simple preparation, short reaction time, low reaction temperature, and is suitable for mass production.

A positive electrode material of a magnesium secondary battery, the positive electrode material is a ferrous disulfide / nanometer carbon composite material formed by in-situ cladding of ferrous disulfide with a carbon nanometer material, and the weight percentage of the carbon material and the ferrous disulfide in the ferrous disulfide / nano carbon composite material is 2 to 5 percent of carbon material and 98 to 95 percent of ferrous disulfide. The invention adopts ferrous disulfide as a basic material, adopts doped nanometer carbon material to carry out in-situ carbon cladding, and obtains thefinal composite material by ''one-step hydrothermal method''. The material can provide more channels for the reversible diffusion of magnesium ions when used for a positive electrode material of a magnesium secondary battery, so that the battery has higher charge-discharge specific capacity and excellent cycle performance. The synthesis of the base material of the invention only needs two elements, the step method is simple and convenient, does not need high-temperature calcination, can be directly applied after preparation, the prepared raw material is rich, the cost is low, and method is easy to produce on a large scale.

The invention discloses a preparation method of core-shell type titanium dioxide and carboxyl chitosan nanoparticles. Anatase type nano titanium dioxide prepared by ionic liquid reaction and carboxyl chitosan are used as raw materials, and the core-shell type titanium dioxide-coated carboxyl chitosan nanoparticles are prepared through the ionic gelation effect of CTAB cation modified titanium dioxide and phosphate and the cross-linking assembly of a polymer assistant. The method disclosed by the invention is simple and convenient to operate, green and environment-friendly, the prepared core-shell nanoparticles can effectively avoid photo-corrosion of nano titanium dioxide to a carrier, and as amino and carboxyl of carboxyl chitosan can be respectively combined with photo-induced electrons and holes of nano titanium dioxide, the photocatalytic performance of titanium dioxide is remarkably enhanced, and electrostatic repulsion exists on the surfaces of the core-shell nanoparticles, so that the defect that the nanoparticles are easy to agglomerate is overcome, and the application prospect is wide.

The invention discloses a method for preparing core-shell titanium dioxide@carboxychitosan nanoparticles, which uses anatase nanometer titanium dioxide and carboxychitosan prepared by ionic liquid reaction as raw materials, and uses CTAB cations to modify titanium dioxide and phosphoric acid. It is prepared by the ionic gelation of salt and the cross-linking assembly of polymer additives. The method of the present invention is easy to operate and environmentally friendly, and the prepared core-shell nanoparticles can effectively avoid the photocorrosion of nano-titanium dioxide to the carrier. Since the amino group and carboxyl group of carboxychitosan can respectively combine with the photogenerated electrons and holes of nano-titanium dioxide, significantly The photocatalytic performance of titanium dioxide is enhanced, and there is electrostatic repulsion on the surface of core-shell nanoparticles, which overcomes the defect that nanoparticles are easy to agglomerate, and has broad application prospects.

The invention discloses an unfired water permeable brick based on granite waste and fire coal slag and a preparation method of the unfired water permeable brick. The unfired water permeable brick is prepared from the following raw materials in parts by weight: 160 to 250 parts of granite particles, 5 to 15 parts of granite powder, 15 to 25 parts of active fire coal slag, 2 to 10 parts of modified desulfurized gypsum, 2 to 8 parts of quick lime, 10 to 20 parts of cement, 1 to 5 parts of additive and water. The water permeable brick is prepared by taking the granite waste and the fire coal slag as main raw materials, a large amount of solid waste is consumed, waste is turned into wealth, low-cost preparation of the water permeable brick is realized, the water permeable brick has the characteristics of stable ecology, energy conservation, environmental protection and resource circulation, and meanwhile, the problems of land resource waste and environmental pollution caused by solid waste accumulation are solved.

The invention discloses rare earth samarium zirconate nano material and a hydrothermal preparation method of the rare earth samarium zirconate nano material. The rare earth samarium zirconate nano material adopts nanoscale rare earth samarium zirconate powder formed by directly performing hydro-thermal synthesis on coprecipitated precursors. The rare earth samarium zirconate powder prepared through the method has a low thermal coefficient and a good thermal barrier effect, and belongs to potential photocatalytic semiconductor material. The method comprises the following steps: firstly, dissolving a zirconium source in deionized water, and then mixing the zirconium source with samarium source solution, secondly, adding prepared strong alkali solution in the mixed solution of the step one, sufficiently stirring to obtain precursor products, and performing centrifugalization to obtain solid precipitate, thirdly, dispersing the solid precipitate of the step two in deionized water, adjusting the PH value of solution, and adding slurry in a high-pressure reaction kettle to be reacted; and fourthly, taking out powder after the reaction, and washing the powder obtain pour phase samarium zirconate nano powder.

The invention discloses a preparation method of a supported rare earth-doped manganese oxide for ozone catalyst. The method uses γ-Al2O3 as a carrier, manganese oxide as an active component of the catalyst, rare earth element as an auxiliary, and sulfuric acid is used as an auxiliary agent. Manganese and rare earth metal nitrate are dissolved in deionized water, isopropanol is added, stirred, the carrier is mixed in the above solution, stirred evenly, heated, and then added with KMnO4 solution, the surface of the carrier is in situ redox reaction to obtain rare earth doped MnO2 modification γ‑Al2O3. The advantages of the method are that the preparation process is simple, the catalyst cost is low, the performance is stable, the ozone decomposition efficiency is high, and the method has broad application prospects.