39results about How to "Improve catalysis" patented technology

Provided are: a catalyst for hydrogenolysis of a polyhydric alcohol, which is capable of selectively producing a hydrogenolysis product of a polyhydric alcohol with high yield without using a liquid acid catalyst; and a method for producing 1,3-propane diol, wherein 1,3-propane diol is produced from glycerol using this catalyst. A catalyst for hydrogenolysis of the present invention is obtained by having a boehmite carrier support a platinum component and a tungsten component. It is preferable that the platinum component and the tungsten component are contained at a ratio of from 1:0.05 to 1:50 (platinum component:tungsten component (weight ratio)). It is also preferable that a catalyst for hydrogenolysis of the present invention is obtained by having a boehmite carrier support a platinum component and a tungsten component, and then firing the resulting product at 200-1,000°C for 1-5 hours.

The invention provides a preparation method of platinum modified nano titanium dioxide. By the preparation method, a property amount of precious metal Pt is deposited on the surface of TiO2, so that an electronic band structure changes, charge carriers are distributed again, and thus solar energy can be directly used for decomposing organic pollutants in gas phase and liquid phase into harmless micromolecules. Pt is loaded on TiO2 in a dispersed manner, on one hand, the area of a part, which is in contact with a reactant, of a catalyst can be increased, the reactant and Pt are interacted strongly, then the electron promotion effect of TiO2 is fully played, and the catalysis of the catalyst is improved; and on the other hand, a Schottky potential barrier can further be formed on the surfaceof TiO2, thus, the Schottky potential barrier becomes a photo-induced electron capturing center, separation of photo-induced charge carriers on the surface of a photocatalyst is promoted, and then the photocatalytic activity is improved.

The invention provides a multifunctional antibacterial compound preparation and an application thereof, relates to an antibacterial compound preparation containing silver/zinc ions and an application of the compound preparation, in particular to an antibacterial compound preparation containing silver/zinc loaded nano-zeolite and tourmaline and an application of the compound preparation, and aims to provide the antibacterial compound preparation which has good antibacterial effect, low cost and firmly loaded silver/zinc ions and the application of the compound preparation. The multifunctional antibacterial compound preparation comprises silver/zinc loaded nano-zeolite powder and tourmaline super micro-powder and has anti-radiation, antibacterial and deodorization functions, components supplement each other and have synergetic antimicrobial effect, the effect is good, the antibacterial compound preparation is used for preparing antibacterial fabric, harmful bacteria on the fabric can be killed, and disease spread can be avoided; and further, the compound preparation has safety, non-toxic function and stable characteristic, so that the requirements for practical application can be met very well, and the multifunctional antibacterial compound preparation can be applied to the field of preparation of an antibacterial product.

The invention provides a preparation method of a porous nickel-alloy hydrogen evolution reaction composite cathode material, and the preparation method is mainly applied to the technical field of hydrogen evolution reactions. A powder reaction synthesis method is adopted, Ni, Fe, Mo, C and LaNi5 are prepared according to a certain ratio, the prepared powder is mixed evenly, 0.5-4% of stearic acid is added into the powder, a green body is obtained through pressure forming after drying is conducted and is subjected to vacuum sintering through the principle of solid-phase partial diffusion, and then the Ni-Fe-Mo-C/LaNi5 porous nickel-alloy hydrogen evolution reaction composite cathode material is obtained, wherein the content of the Fe, Mo, C and LaNi5 powder accounts for 22.5-52% of the total content. The porous nickel-alloy hydrogen evolution reaction composite cathode material prepared through the method has the advantages of being large in specific surface area, low in hydrogen evolution overpotential, good in catalytic property, good in corrosion resistance, stable in working performance, simple and environmentally friendly in preparation process, and the like, and has a significance to development of hydrogen energy sources.

Provided is a non-cyclopentadienyl-based chromium-ligand complex, preferably a chromium-ligand complex of formula (J): LCr(R^A)_m(D)_k (J), wherein L is a non-Cp monoanionic ligand; Cr (chromium) is in a formal oxidation state of +3 or +2; when Cr formally is Cr⁺³, either m is 1 and R^A is hydrocarbylene (a hydrocarbylene chromium-ligand complex of formula (J)) or m is 2 and each R^A independently is hydrocarbyl (a dihydrocarbyl chromium-ligand complex of formula (J)), wherein each hydrocarbyl or hydrocarbylene of R^A independently is unsubstituted or substituted by from 1 to 5 R^AS; each R^AS independently is a neutral aprotic heteroalkyl, neutral aprotic heterocycloalkyl, neutral aprotic heteroaryl, or neutral aprotic aryl; when Cr formally is Cr⁺², m is 1 and R^A is hydrocarbyl (a hydrocarbyl chromium-ligand complex of formula (J)); k is an integer of 0 or 1; D is absent when k is 0 or D is a neutral ligand when k is 1; wherein the chromium-ligand complex of formula (J) is overall neutral and lacks a cyclopentadienyl-based (Cp-based) moiety. Also provided is a chromium catalyst comprising or prepared from the complex. Also provided is a process of making the catalyst and a process employing the chromium catalyst for polymerizing the olefin monomer, especially a straight chain 1-alkene, to prepare the polyolefin, especially a partially chain-straightened poly(1-alkene) or olefin block copolymer. Further provided is the partially chain-straightened poly(1-alkene) or olefin block copolymer prepared thereby. Also provided is a high throughput workflow.

The invention which provides a non-drying preparation technology of ethylene glycol antimony relates to a preparation method of an antimony-containing compound catalyst for a polyester polycondensation reaction. The preparation method, which comprises the following steps: treating excessive ethylene glycol and diantimony trioxide as raw materials, carrying out esterification and dehydration under heating and negative pressure conditions, and filtering and cooling to crystallize, is characterized in that: cooled and crystallized crystals are directly subjected to quality inspection and packing after being dried by a centrifugation drier. In the invention, procedures of drying and washing are omitted, so the damage to ethylene glycol antimony chelates Sb2(OCH2CH2O)3 caused by drying is avoided, and usage of high toxic, flammable and explosive methanol and ethanol is avoided, thereby the production environment is improved, unsafe factors are eliminated, the technology is simplified and the safety cost is reduced; and simultaneously products of the technology of the present invention have 54% to 55% of antimony, the content of antimony is controlled below a theoretical value, and diantimony trioxide is eliminated in the products, so the catalytic performance of the products is improved, the dissolving temperature is reduced, a b value and an L value are improved, and raw material consumption is reduced.

This invention relates to a metal organic compound, a catalytic composition comprising said metal organic compound, a process for homo- or co-polymerizing isoolefines in the presence of said metal organic compound and a method of stabilizing a compound of the general structure (II) [R′HC(CRR″)₂]²⁺[M₂X₉]⁻, in which R is a group of the formula SiR¹R²R³, R″ is hydrogen, C₁ to C₁₂ alkyl, a C₆ to C₁₄ aryl or a C₇ to C₂₀ alkylaryl, M is Zr or Hf, X is a halogen atom, and R¹ to R³ is a C₁ to C₁₂ alkyl group, with a compound R′ of the formula M′R⁴R⁵R⁶, in which M′ is Si, Ge, Sn or Pb and R⁴ to R⁶ is a C₁ to C₁₂ alkyl group as well as a non-coordinating anion of the general structure [M₂X₉]⁻ in which M is Zr or Hf and X is a halogen atom.

The invention discloses sodium modified sepiolite clay. The key points of the technical scheme are as follows: the sodium modified sepiolite clay is prepared from the following raw materials: sepiolite clay, magnesium oxide, sodium carbonate, instant sodium silicate, polyvinyl alcohol and hydroxypropyl methyl cellulose; the sodium modified sepiolite clay is prepared by virtue of following the steps: inputting the raw materials of the sodium modified sepiolite clay into a mill and grinding the raw materials into powder, wherein the grinded powder is the sodium modified sepiolite clay. The sepiolite clay is firstly modified by sodium and then the raw materials are compound, so that the sodium carbonate is prevented from reacting with the instant sodium silicate, polyvinyl alcohol and hydroxypropyl methyl cellulose; the sodium modified sepiolite clay can improve properties of the sepiolite clay, such as adsorbability, rheological property, heat stability, plasticity, caking property, catalysis, specific surface area, porosity and the like; the sodium modified sepiolite clay has good rheological property, thus becoming a valuable thickener, a suspending agent and a thixotropic agent, and being applicable to industries such as cosmetics, toothpaste, soap, paint, coating, fire protection and the like.

The invention discloses a nonmetal oxygen reduction catalyst material as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing a compound containing carbon, hydrogen and oxygen with melamine according to a predetermined proportion; dropwise adding concentrated sulfuric acid, putting into a high-pressure reaction kettle, and performing primary carbonization reaction for 6-10h at 120-200 DEG C to obtain an intermediate product; and performing secondary carbonization reaction on the intermediate product for 2-6h at 600-1,000 DEG C under nitrogen protection to obtain the nonmetal oxygen reduction catalyst material. In the preparation method disclosed by the invention, a compound containing carbon, hydrogen and oxygen is used as a carbon source, and melamine is used as a nitrogen source; after low-temperature carbonization with concentrated sulfuric acid, the nonmetal oxygen reduction catalyst material is formed after high-temperature calcination under nitrogen protection; nitrogen and carbon are skillfully combined; and by introducing the nitrogen atoms, the catalytic effect of carbon on the oxygen reduction reaction is promoted. The method is simple in technology and environment-friendly and very suitable for preparing the nonmetal oxygen reduction catalyst material of a fuel cell.

The invention relates to a preparation method of a protective nano elastic insole, which comprises the following steps: putting natural rubber into an open mill for plastication, adding nitrile rubberin a certain proportion into the open mill for mixing with the natural rubber, and then adding perfume prepared from chlorhexidine hydrochloride, nano silicon dioxide, zeolite powder, tourmaline andother materials according to a certain proportion into the open mill; conducting uniform stirring, sequentially adding a plasticizer, calcium carbonate, carbon black, zinc oxide and other materials according to a formula ratio, and conducting mixing to form a rubber compound; preparing a rubber sheet on a calender, then extruding the rubber sheet into a mold through an extruder, conducting vulcanizing for 1 h at the vulcanizing temperature of 100 DEG C, and then taking out the vulcanized material, and conducting slicing through a slicing machine according to the required thickness. The insoleprepared by the preparation method has the characteristics of thorough deodorization and sterilization effects, long function duration, no side effect on a human body, safety, sanitation, easiness inmanufacturing and the like, and can be widely applied to special shoes.

The invention relates to the technical field of synthetic fibers, in particular to a method for preparing a counter electrode by using a nanofiber membrane loaded with cobalt sulfide. The method for preparing a counter electrode by using a nanofiber membrane loaded with cobalt sulfide includes the following steps: (1) preparation of cobalt sulfide; (2) preparation of a spray solution; (3) preparation of the nanofiber membrane loaded with cobalt sulfide; and (4) preparation of the counter electrode by using the nanofiber membrane loaded with cobalt sulfide. The catalytic properties of the counter electrode prepared from the nanofiber membrane loaded with cobalt sulfide are greatly improved, and the conductivity is good.

Methods and compositions related to the use of a protein with kynureninase activity are described. For example, in certain aspects there may be disclosed a modified kynureninase capable of degrading kynurenine. Furthermore, certain aspects of the invention provide compositions and methods for the treatment of cancer with kynurenine depletion using the disclosed proteins or nucleic acids.

The invention relates to a method for directly growing an even rhenium diselenide nanosheet on a substrate electrode, a modified electrode and application. The method comprises the following steps that 1, selenium powder is heated until the selenium powder gasifies, rhenium trioxide and the substrate electrode are heated, and reducing gas is introduced; 2, after the rhenium trioxide is heated until splitting, the gasified selenium powder and the rhenium trioxide are mixed, the temperature is elevated to 450-700 DEG C continuously, and rhenium diselenide grows and precipitates on the substrateelectrode, so that the even rhenium diselenide nanosheet is obtaned; a mass ratio of the selenium powder to the rhenium trioxide is (200 to 300) to 1. According to the method for directly growing theeven rhenium diselenide nanosheet on the substrate electrode, through a chemical vapor deposition method, the rhenium diselenide directly grows on the substrate electrode, the substrate electrode is used as an electrode for catalyzing hydrogen production, adhesion force between the rhenium diselenide and the electrode is greatly improved, and meanwhile, the catalytic performance of the rhenium diselenide is improved; moreover, the temperature in the method is low, and a technology is simple.

The invention discloses a biological enzyme compound refining agent for cotton fabrics and a using method thereof. The biological enzyme compound refining agent for the cotton fabrics is characterized by comprising, by weight parts, a component 1 and a component 2, wherein the component 1 comprises 30-40 parts of protopectinase, 14-22 parts of protease, 11-15 parts of xylanase, 8-11 parts of laccase, 3-5 parts of 1-hydroxybenzotriazole, 5-9 parts of sodium fatty alcohol polyoxyethylene ether carboxylate and 20-50 parts of water; the component 2 comprises 40-50 parts of alkaline pectinase, 22-34 parts of cellulase, 11-17 parts of cutinase, 10-14 parts of keratinase, 1-2 parts of span-40, 6-10 parts of alkyl polyglucoside and 20-50 parts of water. After the cotton fabrics are processed through the refining agent, the wettability is remarkably improved, and a refining effect is good. The refining agent is simple in using method, convenient to operate, green and free of pollution.

The invention discloses a nickel modified HY molecular sieve oxygen carrier with a three-dimensional porous structure as well as preparation and application thereof. An HY molecular sieve is used as acarrier, transition metal is introduced to modify the molecular sieve, and the loading amount of the transition metal in the obtained metal modified HY oxygen carrier is 5-25%, thereby enhancing thecatalytic and oxygen-carrying capacities of the three-dimensional porous HY molecular sieve; a pyrolysis liquid phase product can be converted into hydrogen-rich synthesis gas under a certain reactioncondition; and the ratio of H2 to CO in the synthesis gas can be regulated and controlled to be about 0.5-3.0 by adjusting the reaction working condition, so that further Fischer-Tropsch synthesis isfacilitated.

The invention relates to a three-dimensional electro-catalysis device and method for removing organic pollutants, nitrate nitrogen and ammonia nitrogen. Treating the wastewater by using a three-dimensional electrode catalysis system; according to the three-dimensional electrode catalytic system, metallic titanium serves as an anode, a coating is arranged on the surface of an anode plate, the coating is made of Gd-doped titanium-based tin dioxide serving as the anode, metallic titanium serves as a cathode, a particle electrode is arranged between the cathode and the anode, and the particle electrode is bentonite-loaded nanoscale zero-valent iron doped with copper and manganese metal elements. The effect of treating organic wastewater, especially sewage containing refractory organics and nitrate nitrogen, is improved on the basis of not adding chemicals.

The invention discloses a coordination type zirconium phosphotungstate catalyst and its application in catalytic hydrogenation of furfural, belonging to the field of heterogeneous catalysis. The zirconium phosphotungstate catalyst prepared by the invention not only has good catalytic effect on the conversion of furfural to furfuryl alcohol, but also has mild reaction conditions. The yield of solid line furfuryl alcohol can be 98% if it can be reacted for 1 h at 120 ° C., and the amount of catalyst is less, which greatly reduces the energy consumption in the prior art. In addition, the zirconium phosphotungstate prepared by the invention is easy to separate, has good stability for catalyzing the hydrogenation of furfural to furfuryl alcohol, and is a new, efficient and green catalyst.

The invention discloses a water quality detection method for ocean lakes, which is specifically used for detecting heavy metal ions in seawater or lakes, and comprises the following steps: dropwise adding an electrode composite material into a bare glassy carbon electrode, using the electrode composite material as a working electrode, and detecting the concentration of the heavy metal ions to be detected in an acid-base buffer solution by using an electrochemical three-electrode system. The preparation process of the electrode composite material comprises the following steps: adding butyl titanate, zinc nitrate, strontium nitrate and erbium chloride into a tert-butyl alcohol/glycerol mixed solution, ultrasonically mixing uniformly, then adding an aqueous solution of CTAB (Cetyltrimethyl Ammonium Bromide), continuously stirring uniformly, dropwise adding an ammonia water solution, and adjusting the pH value to 7-9; transferring the mixed solution into a hydrothermal kettle, and carrying out hydrothermal reaction to obtain a Sr and Er co-doped TiO2-ZnO composite material; adding the Sr and Er co-doped TiO2-ZnO composite material into a silver nitrate solution, then introducing a reducing agent sodium citrate and PVP, and obtaining the Sr and Er co-doped TiO2-ZnO-nano Ag composite material through a reaction at the temperature of 80-90 DEG C. The Sr and Er co-doped TiO2-ZnO-nano Ag composite material has the catalytic ability and sensitivity to heavy metal ions in the solution, the detection limit is reduced, and the detection sensitivity to the heavy metal ions in seawater is improved, such as detection capability of mercury ions and copper ions.

The present invention relates to novel subtilase variants exhibiting increased stability and preferably on par or improved wash performance. The variants of the invention are suitable for use in e.g. cleaning or detergent compositions, such as laundry detergent compositions and dish wash compositions, including automatic dish wash compositions. The present invention also relates to isolated DNA sequences encoding the variants, expression vectors, host cells, and methods for producing and using the variants of the invention.