30results about How to "Reduce catalytic activity" patented technology

The invention belongs to the technical field of nano oil displacement, and particularly relates to rambutan-shaped polyacrylamide nanospheres as well as a preparation method and application thereof. The microspheres prepared by taking PAMAM as a matrix to load the copper quantum dots to initiate acrylamide polymerization have smaller particle sizes. The spherical particle characteristic of the metal copper quantum dots leads to non-uniform polymerization rate, formation of irregular morphology of the nanospheres can be promoted, and finally the rambutan-shaped polyacrylamide nanospheres are prepared. The nanosphere has good hydration expansion performance, the swept volume of injected water is increased, and the effect of deep profile control is achieved. Moreover, the surface of the polyacrylamide nanosphere presents the shape of rambutan, so that the expansion and fracture phenomenon after water absorption can be avoided, the interaction force between the nanospheres is enhanced, and the plugging effect is better. Meanwhile, as the nanospheres absorb water and swell, the swelled antennas play a role in crosslinking the nanospheres, and a better plugging effect can be achieved.

The invention provides aluminum-doped hematite, a preparation method of the aluminum-doped hematite and application of the aluminum-doped hematite in catalyzing peroxides to degrade organic pollutants or remove pathogenic bacteria. The preparation method of the aluminum-doped hematite comprises the following steps: adding ferric iron salt and aluminum salt into deionized water, reacting, precipitating to separate out a product, washing, drying and grinding to obtain a precursor; calcining the precursor, and then washing and drying to obtain the aluminum-doped hematite. The preparation method is simple, cheap and easily available in raw materials, low in cost, green, safe and environment-friendly; the aluminum element is introduced into the hematite, so that the catalytic activity of the hematite is improved, and the catalytic condition is easy to realize; the aluminum-doped hematite disclosed by the invention has excellent capability of activating peroxide, so that the aluminum-doped hematite shows excellent performance in the aspects of removing environmental organic pollutants and sterilizing.

The invention provides a fully synthetic cutting fluid special for a copper part and a preparation process thereof. The fully synthetic cutting fluid special for the copper part comprises the following raw materials in parts by weight: 0.5-2.0 parts of a defoaming agent, 1.0-3.0 parts of an antioxidant, 0.5-2.0 parts of a corrosion inhibitor, 2.0-5.0 parts of a surfactant, 0.5-1.5 parts of a metal ion complexing agent and 80.0-100.0 parts of deionized water. Wherein the antioxidant is prepared from carnosol, daidzin and butylated hydroxytoluene. The carnosol and the daidzin can be used for reducing the oxidation reaction by capturing free radicals, and the butylated hydroxytoluene can be used for further enhancing the anti-oxidation effect by interrupting the oxidation chain reaction. And through the combined action and mutual complementation of different anti-oxidation mechanisms, a synergistic effect is formed, and oxidation of the copper part in the machining process is effectively prevented. Wherein the metal ion complexing agent is composed of isothiocyanate, polyaspartic acid and amino trimethylene phosphonic acid, multiple protection mechanisms are formed, and the corrosion resistance of the copper part is remarkably improved. And the existence of the metal ion complexing agent is also beneficial to improving the stability of the cutting fluid.

The invention discloses a nitrilase mutant capable of reducing the selectivity of 5-chloronicotinonitrile and improving the selectivity of 6-chloronicotinonitrile and application of the nitrilase mutant. The nitrilase mutant is obtained by performing single mutation or multiple mutation on the 128 site, the 144 site and the 146 site of an amino acid sequence shown in SEQ ID No.2. The nitrilase mutant with obviously improved selectivity on 6-chloronicotinonitrile is obtained by screening, the 6-chloronicotinonitrile can be selectively catalyzed by taking recombinant cells containing nitrilase mutant genes or broken crude enzyme liquid of the recombinant cells as a catalyst and 6-chloronicotinonitrile and 5-chloronicotinonitrile as a common substrate, the high-purity 6-chloronicotinic acid can be synthesized in one step, the process is simple, the cost is low, and the method is suitable for industrial production. And the industrial cost is low. Compared with a wild type, the mutant has the advantages that the catalytic activity on 5-chloronicotinonitrile is reduced, and the selectivity on 6-chloronicotinonitrile is improved.

The invention discloses a palladium-supported catalyst for propane catalytic combustion and a preparation method and application thereof. According to the method, a coprecipitation method is utilized under stirring, polyvinylpyrrolidone is used as a guiding agent, cerium dioxide is used as a metal precursor, palladium nitrate is used as a doping agent, and sodium hydroxide and sodium carbonate are used as chemical environment regulating agents to prepare a metal-doped catalyst; the metal-doped catalyst is used in a propane catalytic combustion reaction, efficient degradation of propane is achieved, the catalytic conversion temperature of precious metal is remarkably reduced, and the metal-doped catalyst has the advantages that the one-way propane conversion rate is high, and the reaction is mild; relates to the field of petrochemical engineering.

The invention relates to an interface engineering method of Zn0. 5Cd0. 5S loaded on a high-entropy sulfide cocatalyst and an application of the Zn0. 5Cd0. 5S. According to the method, firstly, a high-entropy sulfide FeCoNiCrAlSx (HES) is synthesized by adopting a solvothermal method, then the high-entropy sulfide HES is introduced into a Zn0. 5Cd0. 5S system through a one-step coprecipitation method, a compact interface is formed between FeCoNiCrAlSx and Zn0. 5Cd0. 5S, and meanwhile, FeCoNiCrAlSx provides abundant active sites. The obtained composite material can promote effective separation and transfer of photo-induced electron holes, the photocatalytic hydrogen production activity of Zn0. 5Cd0. 5S is remarkably improved, and new possibility is provided for designing an efficient and stable non-noble metal photocatalytic system.

This invention relates to the field of agricultural biotechnology, specifically to the phytoene dehydrogenase mutant Y201F and its application in carotenoid synthesis. The amino acid sequence of the phytoene dehydrogenase mutant is shown in SEQ ID NO: 2. The phytoene dehydrogenase mutant provided by this invention can specifically reduce the catalytic activity of the fifth dehydrogenation reaction of phytoene dehydrogenase, guiding the metabolic flux to accumulate the intermediate product lycopene, which is then catalyzed by lycopene cyclase to generate β-carotene and γ-carotene. This achieves targeted regulation of different carotenoid synthesis pathways, providing novel key enzyme elements and metabolic regulation strategies for the targeted biosynthesis of different carotenoids, and has significant application value and technical significance in the fields of food, medicine, and cosmetics.

The invention provides an organic N-P polymer, a preparation method of the organic N-P polymer, a heterogeneous catalyst and application of the heterogeneous catalyst. The organic N-P polymer can form coordination with rhodium, a resin solid heterogeneous catalyst with monatomic catalysis is obtained, the catalytic activity of homogeneous catalysis is reserved, the heterogeneous catalyst is used for olefin hydroformylation reaction, simple solid-liquid separation of the catalyst after the reaction can be realized, the loss of the catalyst is reduced, and the yield of olefin hydroformylation reaction is improved. The problems that a homogeneous catalyst is high in separation cost and high in precious metal rhodium loss are effectively solved, high selectivity and conversion rate are achieved, and the problems that other heterogeneous catalysts adopted in the existing preparation process are low in conversion rate and poor in selectivity are solved.

This application discloses a method for synthesizing polyethylene (2,5-furandicarboxylate), comprising the following steps: mixing 2,5-furandicarboxylic acid and ethylene glycol in a molar ratio of 1:2, adding zinc acetate as an esterification catalyst, and carrying out an esterification reaction at 195°C and a pressure not exceeding 0.3 MPa until the water content reaches 98% of the theoretical amount; adding antimony trioxide as a polymerization catalyst and triphenyl phosphate as a stabilizer to the esterification product, and reacting for 1 hour at a low vacuum of 800-1000 Pa and a temperature of 215°C to carry out pre-condensation; and carrying out a condensation reaction of the pre-condensation product at a high vacuum of less than 200 Pa and a temperature of 235°C until the torque reaches 4.2 A / 65 rpm to obtain polyethylene (2,5-furandicarboxylate). By reducing the amount of antimony trioxide to 0.045% and triphenyl phosphate to 0.1%, the amount of stabilizer was reduced, releasing catalyst activity. This shortened the polymerization time from 300 min to 230 min, reduced the color value b from 12-13 to 10, and improved the intrinsic viscosity to 0.507~0.517 dL / g. This achieved a reduction in production costs and heavy metal residues while improving the product's color.

The application provides an aluminum-doped hematite, a preparation method thereof and application of the aluminum-doped hematite in catalyzing degradation of organic pollutants by peroxide or removal of pathogenic bacteria. The preparation method of the aluminum-doped hematite comprises the following steps: adding a ferric salt and an aluminum salt into deionized water, precipitating the product after reaction, and then washing, drying and grinding the product to obtain a precursor; and then calcining the precursor, and then washing and drying the aluminum-doped hematite. The preparation method is simple, raw materials are cheap and easy to obtain, the cost is low, and the method is green, safe and environmentally friendly. The catalytic activity of the hematite is improved by introducing aluminum elements into the hematite, and the catalytic conditions are easy to realize. The aluminum-doped hematite has excellent ability of activating peroxide, and thus has excellent performance in removing environmental organic pollutants and sterilization.

The present application relates to the field of double metal cyanide complex catalysts, in particular to a cobalt potassium cyanide composition and a preparation method and use thereof, the cobalt potassium cyanide composition provided by the present application comprises cobalt potassium cyanide and a cobalt complex, the molecular formula of the cobalt complex is K3[Co(OH)(CN)5], and the total content of the cobalt complex in the cobalt potassium cyanide composition is 10-500 ppm based on the total mass of the cobalt potassium cyanide composition. The DMC catalyst prepared from the cobalt potassium cyanide composition has high catalytic activity.

The invention discloses a preparation method for synthesizing a framework-containing Ga-MFI molecular sieve without a template agent, which simplifies the traditional synthesis process, reduces the production cost and reduces the environmental pollution. According to the method, no organic template agent needs to be added, the introduction process of gallium is simplified, the production efficiency and environment friendliness are improved, and the integrity and stability of the molecular sieve are kept.

The present invention discloses a class of phenyltriazole MLL1-WDR5 protein-protein interaction inhibitors (I) and a preparation method thereof. Pharmacodynamic experiments show that the compounds of the present invention have strong MLL1-WDR5 protein-protein interaction inhibitory activity.

The invention discloses a methanol reforming hydrogen production micro-sphere catalyst taking a spent SCR (Selective Catalytic Reduction) catalyst as a raw material as well as a preparation method and application of the methanol reforming hydrogen production micro-sphere catalyst. The catalyst takes a micro-sphere prepared from a spent vanadium-based denitration catalyst as a carrier and a composite oxide of nickel oxide and copper oxide as an active component; methanol and water can be converted into hydrogen and carbon dioxide at low temperature, and the method has important economic benefits and social benefits.

This invention relates to the field of cyclic carbonate synthesis technology, specifically to a method for the continuous preparation of cyclic carbonates. The method includes the following steps: (1) mixing an epoxide compound and a solvent to obtain a homogeneous mixture; (2) in the presence of a quaternary ammonium salt coordination bimetallic catalyst, reacting the homogeneous mixture with CO. 2 A synthetic reaction is carried out to obtain cyclic carbonate products. This invention utilizes a specific quaternary ammonium salt-coordinated bimetallic catalyst, which can continuously, efficiently, controllably, and precisely catalyze the preparation of cyclic carbonates from raw materials. The catalyst's catalytic activity shows almost no decrease after 24 hours of continuous use. The catalyst in the reactor is insoluble in the reaction solution, thus simplifying the subsequent separation process and reducing the use of expensive catalysts. Using the method of this invention, the reaction time is reduced from hours to minutes, greatly improving the reaction efficiency.

The invention discloses a magnetic enhanced denitration catalyst and a preparation method and application thereof. CeO2 is used as a main active component, sodium citrate is used as a morphology regulating agent, TiO2atFe3O4 is used as a carrier, and MnFe2O4 is used as an anchoring agent and auxiliary active component. The preparation of the TiO2atFe3O4 nanosphere carrier, the synthesis of the CeO2-MnFe2O4 active component and the efficient assembly of the active component and the nanosphere carrier are realized through multiple hydrothermal and strong acid regulation and control hydrothermal methods. The catalyst is in a nanosphere shape, has high specific surface area and high catalytic activity, can efficiently remove NO in industrial flue gas, has excellent sulfur poisoning resistance, has the advantages of less loss of active components, long service life and the like, and has good economic value and wide market application prospect.

The application discloses a concentrated solution of levetiracetam for injection, which contains levetiracetam, sodium danshensu, sodium chloride, sodium acetate trihydrate and glacial acetic acid, and a preparation method thereof. The concentrated solution of levetiracetam for injection can reduce the generation of impurities of levetiracetam after compounding, and has a synergistic effect in anti-seizure and neuroprotection.

The invention relates to the fields of air pollution prevention and treatment, solid waste pollution absorption and disposal and the like in the advanced environmental protection industry, in particular to a carbon monoxide catalytic combustion catalyst and a preparation method thereof. The preparation method of the carbon monoxide catalytic combustion catalyst comprises the following steps: step A, crushing a waste copper-based methanol synthesis catalyst to obtain first powder; step B, roasting the first powder; step C, washing and filtering the roasted first powder to obtain a filter cake material; step D, drying the filter cake material, and crushing to obtain second powder; step E, adding a forming aid into the second powder for mixing and kneading to obtain a semi-finished product material; and step F, molding the semi-finished product material, drying and roasting to obtain the carbon monoxide catalytic combustion catalyst. According to the method, waste is turned into wealth, the carbon monoxide catalytic combustion catalyst is obtained through the waste methanol synthesis catalyst, and the method has good application and popularization prospects.

The invention discloses an alkaline pure water electrolysis oxygen desorption reaction electrode material and a synthesis method and application thereof.The synthesis method comprises the steps that firstly, a nickel substrate is pretreated, and the treated nickel substrate is placed in a vacuum drying oven; metal salt containing Sn < 4 + > is dissolved in deionized water and stirred until the metal salt is completely dissolved, and a precursor solution is obtained; a nickel substrate is completely immersed in the prepared precursor solution for standing, a nickel electrode is taken out after standing, and the electrode material for the alkaline pure water electrolysis oxygen desorption reaction can be obtained after drying. The electrode material synthesized by the method has a good catalytic effect on alkaline simulated seawater electrolysis oxygen desorption reaction, the overpotential is only 300-330 mV under the current density of 10 mA cm <-2 > in a 1M KOH medium, the stability can be as long as 24 hours under the current density of 500 mA cm <-2 > in the 1M KOH medium, and inactivation does not occur.

The present application relates to a kind of for electrolytic hydrogen production with the preparation method and its application of nitrogen-doped carbon material as carrier load ruthenium catalyst, wherein with the preparation method of nitrogen-doped carbon material as carrier load ruthenium catalyst, it includes the following steps: (1) the preparation of nitrogen-doped carbon carrier;Melamine, lignin or the uniform mixing of primary biomass containing lignin obtains the precursor of nitrogen-doped carbon material;The precursor is calcined under high-temperature argon atmosphere to obtain nitrogen-doped carbon material.(2) load ruthenium on nitrogen-doped carbon carrier;After the uniform mixing of precursor ruthenium salt and nitrogen-doped carbon material is dried, it is calcined under high-temperature hydrogen atmosphere to obtain with the preparation method of nitrogen-doped carbon material as carrier load ruthenium catalyst.The operation is simple, and part of carbon comes from natural biomass, and the cost is low, and the catalyst obtained in catalytic hydrogen evolution process has higher catalytic activity.

The invention belongs to the technical field of synthesis of alkylphenol polyether, and particularly relates to a CoFe DMC-coated PmPD composite catalytic material as well as a preparation method and application thereof, and a preparation method of alkylphenol polyether. The preparation method comprises the following steps: injecting a hexacyanoferrate (III) acid salt mixed solution into a cobalt salt mixed solution, mixing, and aging to obtain a CoFe DMC material; the injection speed is greater than or equal to 100 [mu] L.min <-1 >, and the aging time is greater than or equal to 24 h; and mixing the CoFe DMC material, m-phenylenediamine, a free radical initiator and water, and performing free radical polymerization reaction on the surface of the CoFe DMC material to obtain poly (m-phenylenediamine), thereby obtaining the CoFe DMC-coated PmPD composite catalytic material. When the CoFe DMC-coated PmPD composite catalytic material prepared by the invention is used for preparing alkylphenol polyether, the induction time can be shortened by more than half, and the CoFe DMC-coated PmPD composite catalytic material has obvious guiding significance of reducing cost and improving efficiency in industrial production of alkylphenol polyether products.

The invention relates to the technical field of maleic anhydride production, in particular to a multi-stage bed high-load low-resistance catalyst for maleic anhydride produced by a butane process and a preparation method of the catalyst. The method comprises the following steps: step 1, (1) sequentially adding vanadium pentoxide and co-catalytic metal salt into a mixed solvent of isobutanol and benzyl alcohol; controlling the temperature to be 100-130 DEG C, and dropwise adding phosphoric acid within 1-2 hours at a constant speed; continuously carrying out reflux reaction for 10-20 hours; cooling and filtering; filtering to obtain a filter cake; (2) sequentially drying and roasting the filter cake to obtain an active precursor; 2, (1) granulating the active precursor, adding graphite, uniformly mixing, and carrying out compression molding to obtain a catalyst A semi-finished product; (2) activating the catalyst A semi-finished product in an oxygen-containing atmosphere to obtain a catalyst A; and 3, diluting and compounding the catalyst A and an inert magnetic ring to obtain the butane-process maleic anhydride catalyst.

The invention provides a supported metal oxide catalyst which is characterized in that an F-containing Zr-modified silicon-based molecular sieve is used as a carrier, an active metal oxide is supported on the carrier, the silicon-based molecular sieve has two independent pore structures, and the active metal oxide is one or more oxides of Ti, Ca, Sr, Rb and Cs. The invention also provides a preparation method and application of the supported metal oxide catalyst. The invention further provides a method for preparing dimethyl ketene through isobutyric acid cracking. When the supported metal oxide catalyst provided by the invention is used for catalyzing cracking reaction of isobutyric acid to prepare the dimethyl ketene, the isobutyric acid conversion rate is high, the selectivity of a target product is good, the service life of the catalyst can be greatly prolonged, and a solid foundation is provided for expanded production and application of the dimethyl ketene.

The invention discloses a nano small-grain EU-1 / ZSM-12 eutectic molecular sieve and a synthesis method thereof. The eutectic molecular sieve has a single grain length of less than or equal to 300nm, a total specific surface area of more than or equal to 350m < 2 > / g and a total pore volume of more than or equal to 0.24 cm < 3 > / g, the weight percentage of the EU-1 molecular sieve is 5-90%, the weight percentage of the ZSM-12 molecular sieve is 10-95%, and the molar ratio range of silicon oxide to aluminum oxide in the molecular sieve is 20-200. The preparation method comprises the following steps: carrying out hydrothermal crystallization on a mixture of organosilane, an aluminum source, an alkali source, 1, 6-bis (methylpyrrolidine) hexane dihydroxide OSDA1, methyltriethylammonium hydroxide OSDA2, an alcohol amine organic auxiliary agent AIDS and deionized water H2O to obtain the product.

The invention discloses a catalyst as well as a preparation method and application thereof, the catalyst comprises nitrogen-doped porous carbon, and Co3O4 nanoparticles with hollow structures and MnO2 nanoparticles are loaded on the nitrogen-doped porous carbon. The preparation method comprises the following steps: taking a MnCoZn-ZIF material as a raw material, and carrying out two-step calcination treatment at different temperatures and atmospheres. In the invention, under the synergistic effect of the nitrogen-doped porous carbon, the Co3O4 nanoparticles and the MnO2 nanoparticles, the catalyst can be ensured to have excellent catalytic activity on the premise of reducing the content of Co3O4, and the catalyst has the advantages of low cost, large specific surface area, multiple active sites, high catalytic oxidation activity, good stability and the like; the catalyst can be widely used for catalytic oxidation of carbon monoxide, can quickly and thoroughly oxidize carbon monoxide into carbon dioxide, and is beneficial to effective purification of carbon monoxide tail gas. The preparation method has the advantages of simple process, convenience in operation and the like, is suitable for large-scale preparation and is convenient for industrial application.

The invention discloses a cucurbitadienol synthase mutant and application thereof, and relates to the technical field of protein engineering and genetic engineering. The inventor carries out random mutation on CDS, one or more CDS mutants are obtained through a large number of screening, and the mutants can improve the catalytic activity and / or substrate selectivity of cucurbitadienol synthase. Therefore, the cucurbitadienol synthase mutant provided by the invention provides a good foundation for the industrial production of the 24, 25-epoxy cucurbitadienol and the mogroside V. The invention further provides a preparation method of the cucurbitadienol synthase mutant.

The invention discloses a low-odor phosphazene catalyst and application thereof. The low-odor phosphazene catalyst comprises phosphazene cations as shown in a general formula (I) and alkali metal salt compound anions, the catalyst takes phosphorus pentahalide and guanidine compounds as raw materials, the phosphorus pentahalide is dissolved in a non-benzene organic solution, an organic phosphonium salt solution containing an organic solvent and a halogenated phosphorus compound is obtained through a reaction under the heating condition, then an alkali metal salt compound is added, a reaction is conducted under the inert atmosphere and the heating condition, and the guanidine compounds are obtained. And carrying out filtration, reduced pressure distillation, purification and vacuum drying to obtain the purified phosphazene catalyst. The catalyst is applied to preparation of polyether polyol and polyurethane foam materials. When the phosphazene catalyst is prepared, a non-benzene inert solvent which does not participate in the reaction is adopted, the solvent does not need to be frequently replaced, and the steps of extraction, distillation and the like are reduced by using the same solvent, so that the energy consumption and the generation of wastewater and waste materials in the process are reduced. The continuous preparation method of the phosphazene catalyst is efficient and environment-friendly.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a method for preparing catalyst microspheres by a supergravity method, which comprises the following steps of: 1, premixing: preliminarily mixing silica sol containing silicon dioxide and a catalyst in proportion to form slurry, pumping the mixed slurry into a supergravity device by using a peristaltic pump, and intensively mixing to obtain mixed slurry; uniformly distributed catalyst slurry is obtained; and 2, spray molding of the catalyst slurry: carrying out spray molding on the catalyst slurry obtained in the step 1 by a supergravity machine, and then carrying out high-temperature calcination to obtain the catalyst microspheres. According to the invention, the premixed slurry is reinforced through supergravity, and then the catalyst microspheres with uniform particle sizes are formed through the supergravity spray head, so that the obtained catalyst microspheres have higher sphericity and more uniform particle sizes, the activity of the spherical catalyst is kept stable, and the original primary powder level of the catalyst can be kept. The industrialization is relatively easy to realize, and the high activity of the catalyst is ensured, and the mechanical strength and the recycling convenience of the catalyst are also ensured.

The application discloses a kind of immobilized chiral phosphoric acid catalyst and its preparation method and application, belong to the field of catalyst immobilization.The method includes the following steps: S1.chiral phosphoric acid is reacted with 1-chloromethyl-4-vinylbenzene, and 4-vinylbenzyl structural unit is entered on chiral phosphoric acid skeleton, to obtain heterogeneous chiral phosphoric acid monomer;S2.the heterogeneous chiral phosphoric acid monomer, styrene and divinylbenzene are polymerized under the action of initiator, to obtain immobilized chiral phosphoric acid catalyst.The present application realizes the introduction of polymerizable monomer unit by one-step Friedel-Crafts alkylation reaction, greatly simplifies the process.The obtained immobilized catalyst is not only easy to recover, after continuous circulation multiple uses, its catalytic activity and enantioselectivity do not see significant decline, provides efficient, economical solution for the scale industrial application of chiral phosphoric acid catalyst.

This invention relates to the fields of air pollution control and solid waste disposal in advanced environmental protection industries, and particularly to a carbon monoxide catalytic combustion catalyst and its preparation method. The preparation method of the carbon monoxide catalytic combustion catalyst includes: Step A, crushing waste copper-based methanol synthesis catalyst to obtain a first powder; Step B, calcining the first powder; Step C, washing and filtering the calcined first powder to obtain a filter cake material; Step D, drying and crushing the filter cake material to obtain a second powder; Step E, adding a molding aid to the second powder and kneading to obtain a semi-finished product; Step F, molding the semi-finished product, and then drying and calcining it to obtain the carbon monoxide catalytic combustion catalyst. This invention turns waste into treasure, utilizing waste methanol synthesis catalyst to obtain a carbon monoxide catalytic combustion catalyst, and has good prospects for widespread application.