38results about How to "Reduce synthesis energy consumption" patented technology

The invention relates to a barium titanium iron series phhotocatalyst and a preparation method thereof, and belongs to the field of phhotocatalyst. In accordance with the chemical formula Bi5FeTi3O15, the invention adds titanium salt or titanate, malysite, bismuth salt into deionized water or acidic solution to dissolve and mix evenly, adds in aqueous alkali to produce settlings, and then adds the settlings into a water heat retort; after water heat reaction, the Bi5FeTi3O15 catalyst material is obtained after centrifugation, washing and drying. The invention reduces energy consumption of synthesization, and the product has even components, controllable grain size, quite high specific surface area, and good photocatalytic performance.

The invention provides a method for preparing a titanium silicon molecular sieve TS-1 with high framework titanium content. The method particularly comprises the following steps: mixing a silicon source and a titanium source according to the proportion, and adding an aqueous solution of quaternary ammonium base to obtain mixed liquid; hydrolyzing the mixed liquid to remove alcohol, adding a starch solution and performing crystallization to obtain a crystallization product; and drying and roasting the crystallization product to obtain the titanium silicon molecular sieve TS-1 with high framework titanium content. According to the method, the starch solution is added in the synthesis process, the silicon source is in bridge connection with the titanium source by utilizing a large amount of hydroxyl groups in the starch, and the silicon source and the titanium source are easy to combine, so that more titanium can enter the TS-1 framework. The titanium silicon molecular sieve prepared with the method has high titanium content and hardly contains extra-framework titanium, and mother liquid can be recycled.

The invention discloses a pulse potential preparation method for nitrogen-doped fluorescent carbon dots. The pulse potential preparation method is characterized in that a combination of organic matter 1 and organic matter 2 is used as a carbon source, mixed liquid formed by ultrasonically configurating water and the combination is used as electrolyte, the organic matter 1 is one of ethanol, citric acid and ascorbic acid, the organic matter 2 is one of o-phenylenediamine, m-phenylenediamine and p-phenylenediamine, and the ratio of the amount of matter of the organic matter 1, the organic matter 2 and water is 200-50:1:120-20; a two-electrode system is adopted, a working electrode and a counter electrode both are platinum electrodes, the pulse potential method parameters are set, the electrolyte is carbonized for 1-4 hours, and a reaction solution is obtained; after the reaction solution stands still for a period of time, supernatant is taken, the pH of the supernatant is adjusted to be neutral, centrifugal treatment is conducted, rotation, evaporation and concentration are conducted, and a concentrated solution is obtained; and the concentrated solution is subjected to dialysis treatment in deionized water, and then an aqueous solution of the nitrogen-doped fluorescent carbon dots is obtained. The method is simple, the fluorescence yield of the obtained fluorescent carbon dots is high, the water solubility is good, and the stability is good.

The invention discloses a method for synthesizing 2-halogenated nicotinic acid ester and intermediates thereof through microwave method. The method comprises the following steps: adding substitute amino acrolein, a catalyst and cyan-acetic ester into a reactor, carrying out reaction under microwave radiation, and tracking the reaction till substitute amino acrolein disappears to prepare and obtain reaction liquid of the intermediates of 2-halogenated nicotinic acid ester; adding hydrogen halide into the reaction liquid, continuously carrying out reaction, and tracking and monitoring the reaction till the reaction is complete; adding alkali liquor into the reaction liquid to adjust the pH value to 5-6; carrying out standing delamination to obtain an aqueous layer and an organic layer; extracting the aqueous layer with an organic solvent, combining the extracted aqueous layer with the organic layer, and carrying out refinement to prepare and obtain 2-halogenated nicotinic acid ester. The synthesis method of 2-halogenated nicotinic acid ester related to the invention has the advantages of beingenvironment-friendly, short in reaction time, simple to operate, high in product yield and good in quality.

The invention relates to a method for synthesizing an A type molecular sieve membrane at a low temperature. The method comprises the following steps: crystallizing a silicon source, an aluminum source, an alkali and water to prepare an A type molecular sieve nano-seed crystal; preparing a synthetic mother liquor from the silicon source, the aluminum source, the alkali and water; and coating a carrier with the A type molecular sieve nano-seed crystal, placing the carrier in the synthetic mother liquor, and carrying out hydrothermal crystallization at 20-45 DEG C for 2-10 d to obtain the ultrathin A type molecular sieve membrane. The size of the molecular sieve crystal synthesized in the present invention is reduced from 1 [mu]m to about 300-500 nm, so the thickness of the membrane is reduced to about 1 [mu]m, and the permeation flux is high. In addition, the reduction of the crystallization temperature can slow down the formation process of the molecular sieve membrane and facilitate the cross-linking between the molecular sieve crystals, so generated defects are reduced, and the separation selectivity is high. The synthesis of the A type molecular sieve membrane at room temperaturemakes the synthesis process consume no energy, so energy saving and environmental protection are benefited. The synthesized A type molecular sieve membrane has a high flux and a high separation coefficient in solvent dehydration.

The invention provides a preparation method of a ZSM-5 nanosheet aggregate grown through directional piling. The method comprises the following steps: mixing a silicon source, a template agent, organic amine and water, and crystallizing the obtained mixed solution to obtain a nano-microcrystalline emulsion; mixing and dissolving inorganic alkali and an aluminum source in water, and dropwise addingsilica sol to obtain silicon-aluminum mixed gel; and dropwise adding the nano-microcrystalline emulsion into the silicon-aluminum mixed gel, sequentially carrying out pre-crystallization and high-temperature crystallization, carrying out solid-liquid separation, and performing calcining to obtain the ZSM-5 nano-sheet aggregate. The ZSM-5 nanosheet aggregate prepared by the preparation method is uniform in particle size, and ZSM-5 crystals that form particles are stacked in order; and the preparation method is simple to operate and low in cost, and has wide industrial application prospects.

The invention discloses a lithium manganate composite material and a preparation method thereof. The preparation method has the following advantages: 1) a natural lithium-bearing brine resource is comprehensively utilized as a lithium source, the usage amount of a refined lithium salt is reduced, and the material synthesis cost is substantially reduced; 2) the lithium source and a manganate source are uniformly distributed on an atomic level by an ion exchange method, a lattice matrix is easy to rearrange through short-range diffusion, the energy consumption is low during the synthesis process, a relatively low synthesis temperature and relatively short synthesis time are obtained, the grain distribution is uniform, and the polarization is reduced; 3) the constituent contents of lithium and magnesium are reasonably controlled by adjusting a pH value, lithium magnesium-doped type lithium manganate is prepared, the average valence state of manganate during the charge-discharge process is improved, a Jahn-Teller effect is effectively inhibited, and the cycle stability is improved; and 4) from the aspect of economic and environmental protection, the preparation method has more advantages than other schemes, and particularly, the preparation method has practical significance to extract lithium from a liquid-state lithium-bearing brine resource with a high magnesium-lithium ratio to synthesize a composite battery material.

The invention discloses a lithium titanate negative electrode material and a preparation method therefor. Metatitanic acid is adopted to absorb lithium from brine through ion exchange; then a lithium salt is added; the molar ratio of lithium to titanium is adjusted to be 4 to 5; and the lithium titanate negative electrode material is obtained by sintering through a solid-phase method. The lithium titanate negative electrode material and the preparation method therefor have the following technological advantages that: 1) the natural lithium-bearing brine is taken as the lithium source comprehensively, so that the usage amount of the refined lithium salt is lowered, and the material synthesis cost is greatly lowered; 2) due to the ion exchange method, the lithium source and the titanium source are uniformly distributed on the atomic level; the rearrangement of lattice matrix can be realized through short-range diffusion easily, so that the synthesis process is low in cost, and relatively low synthesis temperature and relatively short synthesis time can be realized; 3) due to the low synthesis temperature, the grain fineness distribution is uniform, and an more excellent electrochemical performance is presented after the carbon layer is coated in an in-situ manner; and 4) a higher advantage is realized compared with other schemes in the aspects of economic efficiency and environmental protection, and particularly, the practical meaning of extracting lithium from liquid lithium resource to synthesize the battery material is achieved.

The invention discloses a preparation method of a YAl1-xMxO3 (M equals Fe, Co and Cu) nano-pigment. The preparation method comprises the following steps: firstly, at normal temperature, taking deionized water, stirring on a magnetic stirrer, sequentially and completely dissolving moderate ferric nitrate, aluminum nitrate and yttrium nitrate into the deionized water according to the molar ratio ofY to Al to Fe, and adding succinic acid as a stabilizer to obtain a solution A after the raw materials are completely dissolved; secondly, after a substance in the mixed solution A is completely dissolved, dropwise adding ammonium hydroxide and adjusting a pH value of the solution A to obtain a solution B, and then adding 1,2-propylene glycol into the solution B to obtain a mixed solution; and thirdly, stirring the mixed solution in the second step on a 60 DEG C thermostatic magnetic stirrer for 2 hours until the solution forms gel, and then drying, grinding and calcining to obtain solid powder. The preparation method disclosed by the invention is green and pollution-free; an obtained product has the advantages of high dispersity, low energy consumption, uniform particles, excellent environment friendliness, low synthetic temperature, simple and controllable process, suitability for large-scale production and the like.

The invention provides an application and evaluation method of a catalytic product and organic layered double-metal silicate, the catalytic product is in a liquid state or a solid state, and under the condition that the product is in the liquid state, the catalytic product comprises a solvent and the organic layered double-metal silicate dissolved in the solvent; under the condition that the product is in a solid state, the catalytic product comprises a carrier and organic layered bimetallic silicate attached to the carrier; the chemical formula of the organic layered bimetallic silicate is [H2N (CH2) 3] 4 [Siz (MxQy) 6O8 (OH) 2]. The application of the organic layered double-metal silicate in preparation of a catalyst and an evaluation method of the enzymatic activity of the organic layered double-metal silicate adopt the organic layered double-metal silicate. The organic layered bimetallic silicate can be used for catalysis; the organic layered bimetallic silicate has improved enzyme catalytic activity, and is low in cost and low in synthesis energy consumption.

The invention discloses a method for synthesizing 2-halo-3-substited alkylsulfonyl pyridine and an intermediate compound thereof through a microwave method. The method comprises the following steps: adding substituted amino acraldehyde, a catalyst and substituent cyanoethyl sulfone into a reactor, reacting under microwave radiation, and tracking the reaction until the substituted amino acraldehyde or the substituent cyanoethyl sulfone reacts completely, thereby preparing the intermediate compound; adding halogen hydride into the reaction solution, further reacting, and tracking detection until the reaction is complete; and adding an alkaline solution into the reaction solution to regulate the pH value to 7-8, standing for stratification to obtain a water layer and an organic layer, extracting the water layer with organic solvent, then merging the organic layers, and refining to prepare the 2-halo-3-substited alkylsulfonyl pyridine. According to the invention, the method for synthesizing 2-halo-3-substited alkylsulfonyl pyridine has the advantages of greenness, environment friendliness, short reaction time, simple operation process and high product yield; and the product has favorable bactericidal activity.

The invention relates to a synthetic method of 5-hydroxymethylfurfural promoted by a surfactant. According to the method, fructose is used as a raw material, 1, 4-dioxane and water are used as a mixed solvent, dodecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium bromide, hexadecyl dimethyl ethyl ammonium bromide, octadecyl trimethyl ammonium bromide or hexadecyl trimethyl ammonium chloride are used as surfactants, sulfuric acid is used as a catalyst, and the fructose is synthesized through a one-pot method. And synthesizing the 5-hydroxymethylfurfural in a closed reactor in which air is removed. According to the method, the surfactant is utilized to create a solvent microenvironment beneficial to fructose dehydration and timely removal of HMF, generation of by-products such as micromolecular organic acid and humin is reduced, and the utilization rate of raw material carbon is high; the method is suitable for the dehydration reaction of high-concentration fructose, and the synthesis efficiency of HMF is high; the method has the advantages of high HMF yield, few byproducts, easiness in separation and purification, low synthesis energy consumption and favorable industrial application prospect.

The invention relates to the technical field of catalyst preparation, in particular to an iron-nickel-based or iron-cobalt-based Mott-Schottky electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly synthesizing a metal organic framework material (Zn-Ni-ZIF or Zn-Co-ZIF) nano cube containing zinc and nickel (or cobalt), and then etching the metal organic framework material (Zn-Ni-ZIF or Zn-Co-ZIF) nano cube by using potassium ferricyanide to form a hollow structure so as to form a Zn-Ni (Co)-ZIF nano cube-Prussian blue analogue core-shell structure; and finally, performing pyrolysis under the atmosphere of nitrogen to form the NiFe-Fe3C (or CoFe-Fe3C) Mott-Schottky electrocatalyst. The catalyst has a typical hollow nanometer box structure, the specific surface area is higher, more active sites exist, nitrogen-doped carbon serving as a main framework of the catalyst has good conductivity, and mass transfer and charge transfer processes of electro-catalytic reaction can be accelerated. The catalyst belongs to a bifunctional catalyst, not only can catalyze an oxygen reduction reaction, but also can drive an oxygen evolution reaction, meets the requirements of a rechargeable zinc-air battery, and shows a potential application prospect to replace a commercial noble metal catalyst.