96results about How to "Lower reaction barrier" patented technology

The present invention relates to the field of the hydrotalcite, discloses magnesium aluminum hydrotalcite and a method for preparing the magnesium aluminum hydrotalcite, the method comprises the following steps: (1) in the presence of water, performing ball-milling on a magnesium source and / or aluminum hydroxide to obtain a sol precursor; (2) diluting the sol precursor with water, mixing the diluted solution with the magnesium source and / or aluminum hydroxide, contacting the obtained mixture with an acid matter, and thermally insulating at 30-90 DEG C for 10-300min to obtain a magnesium aluminum composite sol; (3) under hydrothermal reaction conditions, contacting the magnesium aluminum composite sol with a crystal form control agent to obtain magnesium aluminum hydrotalcite paste; and (4) contacting the magnesium aluminum hydrotalcite paste with a surface modification agent for reaction. The method has the advantages of simple process and low cost, and can improve the crystallinity of the magnesium aluminum hydrotalcite.

The invention belongs to the technical field of bio-based carbon materials, and particularly relates to a doping method of a green bristlegrass-based bio-based carbon material, which comprises: carbonizing green bristlegrass for 3-10 h at a temperature of 200-1000 DEG C in an inert gas atmosphere to obtain a green bristlegrass carbon material; grinding the green bristlegrass carbon material and anactivating agent to obtain a mixture, and reacting the mixture with the activating agent for 3-10 hours at the temperature of 200-1000 DEG C under the protection of inert gas to obtain the green bristlegrass bio-based carbon material; mixing the green bristlegrass bio-based carbon material, a doping compound and a solvent, and carrying out microwave reaction for 3-8 hours at 60-240 DEG C in an inert gas atmosphere to obtain a green bristlegrass bio-based microwave doped carbon material. The doping method based on the green bristlegrass bio-based carbon material is low in reaction temperature,high in doping rate, simple in process, high in yield and suitable for industrial production.

The invention discloses a preparation method for imatinib. According to the method, N-(5-iodo-2-methylphenyl)-4-(pyridin-3-yl)pyrimidin-2-amine and 4-((4-methyl-piperazin-1-yl)methyl)benzamide are used as raw materials; potassium phosphate, 1,10-phenanthroline and cuprous iodide are added; a reaction at room temperature is carried out; and aftertreatment is carried out so as to obtain imatinib. The method provided by the invention overcomes the problems of wearing of equipment and high energy consumption due to a high-temperature long-time reaction and is mild in reaction conditions, easy to operate, high in yield and suitable for industrial scale-up production.

The invention relates to a glass refining agent and a preparation method thereof, and belongs to the field of the glass refining agents. Catalytic oxygen evolution is performed through catalyst additive release by gas; meanwhile, the assembly is formed with ferriporphyrin; the catalysis active center sites are increased; the catalysis process is promoted; water steam and glass melt take reaction at the molten high temperature; the viscosity and surface tension of the glass are reduced; the bubble discharge is promoted; a branched structure is formed through an extrusion foam discharge agent; the flowability of a refining agent is improved; substances with elastic structures and good mechanical performance form elastic deformation, so that the extrusion discharging of bubbles is further promoted; the glass crystallization is induced through light transmission nucleation additives; the light effect of the glass is improved, so that the transparency of the glass is improved; auxiliary additives are added in an auxiliary way to realize the coordination participation into a glass silica network structure; the softening point of the glass is improved; the better melting is realized. Theglass refining agent and the preparation method solve the problems that by using the existing glass refining agent, micro bubbles liable to occur on the glass plate surface, and flaws are caused.

The invention relates to the technical field of building materials, and aims to provide a preparation method of a manganese phthalocyanine modified oxhorn-shaped carbon-based catalyst. The preparationmethod comprises the following steps: calcining a mixture of ammonium bromide and melamine to obtain carbon nitride, and pyrolyzing in a nitrogen atmosphere; and cleaning and drying the product to obtain the oxhorn-shaped carbon-based catalyst; dispersing the manganese phthalocyanine modified oxhorn-shaped carbon-based catalyst into an N-N-dimethylformamide solution, performing ultrasonic treatment, adding manganese phthalocyanine molecules, performing ultrasonic treatment, stirring, cleaning and drying to obtain the manganese phthalocyanine modified oxhorn-shaped carbon-based catalyst. The product provided by the invention has rich porous structure, high specific surface area, high content of pyridine nitrogen and pyrrole nitrogen active sites and good conductivity, and is an efficient cathode catalyst. The carbon-based catalyst with the horn-shaped structure has a tip effect to enrich charges under the action of an electric field, so that the efficient reduction reaction of CO2 is promoted. Manganese single atoms in phthalocyanine manganese molecules are used as active sites, so that the reaction energy barrier of reducing CO2 into an intermediate product COOH * is reduced, theconversion reaction of CO2 into a CO gas product is promoted, and the Faraday efficiency is high.

The invention provides a high-emissivity and high-entropy ceramic material and a preparation method and application thereof, and belongs to the technical field of high-entropy ceramic materials. Five rare earth elements with different doping proportions are simultaneously introduced into the crystal lattice position of La, the number of impurity energy levels between the valence band top and the conduction band bottom of LaMgAl11O19 is increased, the forbidden band width is reduced, electrons in the impurity energy levels can absorb energy of infrared light to jump to the conduction band, and then the spectral emissivity of the corresponding wave band is improved; according to the invention, Pr, Ce or Eu elements with variable valence are introduced into the LaMgAl11O19 ceramic material, and when the valence state of the Pr, Ce or Eu elements is changed, the concentration of free electrons in a system can be increased (for example, the valence of Pr < 3 + > is changed to Pr < 4 + >) so that the absorption of free carriers to infrared light is promoted, and the improvement of spectral emissivity is also facilitated. The spectral emissivity of the ceramic material in the infrared band of 3-5 [mu] m is greater than 0.85, and the ceramic material has a good application prospect.

The invention provides a chemical corrosion preparation method of a porous CeO2 loaded perovskite composite catalytic material. The chemical corrosion preparation method comprises the following steps:(1) preparing a solution; (2) preparing a precursor; (3) performing chemical corrosion; (4) performing calcining treatment. The method, being different from a traditional preparation method, has theadvantages that perovskite in-situ loading is realized while the porous CeO2 carrier is synthesized by utilizing a chemical corrosion method, multi-step deposition or impregnation is not needed, and the porous structure composite catalyst can be generated in situ only by calcining a one-step synthesized precursor, corroding off sacrificial oxide and performing proper heat treatment. A surface-loaded perovskite stacking structure is prepared into a supporting pore structure with a nano-pore channel, so that in-situ loading of perovskite is realized and a firmer interface is formed; therefore, harmful pollutants can be in more effective contact with a catalyst, and the effect of a porous structure, especially a perovskite active phase loaded on the porous structure, is brought into full play, so that the catalytic activity of the catalyst is improved. Besides, the agglomeration and growth of the active phase nano-particles in the heating or service process can be inhibited.

The invention relates to a method for preparing Au / g-C3N4 composite-type micro-nano material. The method is realized by steps of adding g-C3N4 powder in 400-900nano in granularity to chloroauric acid solution, ultrasonically dispersing the g-C3N4 powder so as to prepare turbid liquid; heating the turbid liquid in water bath; then, adding sodium citrate to solution, stirring, washing, separating and drying a mixture so as to obtain Au / g-C3N4 composite-type micro-nano material; the Au / g-C3N4 composite-type micro-nano material has excellent photochemical catalysis effect to formic acid oxidation; and oxidation potential is negatively shifted by 800mV (close to the catalytic oxidation potential of Pt) without ctalyst poisoning phenomenon. According to the advantages of the invention, acquired composite material particles are even and not united; a preparation method is simple; and cost is relatively low.