7results about How to "Facilitate catalytic conversion" patented technology

The invention belongs to the technical field of electrochemistry, and discloses a pi-d conjugated covalent organic framework material, and a preparation method thereof comprises the following steps: adding 2, 5-hydroxyterephthalic acid, 2, 3, 5, 6-tetra (amino) p-benzoquinone and nickel acetate tetrahydrate into a container, then adding N-methyl pyrrolidone, carrying out ultrasonic treatment for 0.5 h, transferring into a hydrothermal reaction kettle, carrying out a sealed reaction for 2-5 days, and carrying out vacuum drying to obtain the pi-d conjugated covalent organic framework material. And after the reaction is finished, naturally cooling to room temperature, filtering, collecting, washing and performing vacuum drying on the obtained precipitate to obtain the pi-d conjugated covalent organic framework material. The covalent organic framework material disclosed by the invention is rich in N / O chemical adsorption sites and Ni < 2 + > catalytic sites, so that shuttling of polysulfide can be effectively inhibited; on the other hand, catalytic conversion of polysulfide is promoted, the reaction kinetics of the lithium-sulfur battery is further accelerated, and compared with a traditional covalent organic framework, the conductivity is greatly improved, and the electron transmission capacity is improved.

The invention discloses a method for preparing methanol through mild and efficient catalysis of CO2 hydrogenation under driving of an electric field. According to the method, direct current is applied to a CuZnAl catalyst bed layer, and the CO2 conversion rate and the methanol selectivity are effectively improved by changing the structural property of the catalyst and the electronic state of Cu species. And when only 0.5 W power is applied, the CO2 conversion rate and the methanol selectivity can be improved by 10-15%. The catalytic method has the advantages of simplicity in operation, high catalytic efficiency, good stability and the like, and shows a very good application prospect.

The invention belongs to the technical field of nano material preparation and catalysts, and particularly relates to a carbon-paper-loaded ternary heterostructure interlayer rich in sulfur vacancies as well as a preparation method and application of the carbon-paper-loaded ternary heterostructure interlayer. Comprising the following steps: S1, dissolving ammonium molybdate tetrahydrate and thiourea in deionized water, adding ZIF-67, uniformly stirring and mixing, and immersing carbon paper in a mixed solution; s2, performing hydrothermal reaction on the mixed solution obtained in the step S1, cleaning and drying to obtain a precursor; and S3, putting the precursor obtained in the step S2 into a ceramic ark, putting the ceramic ark at the rear end of a tubular furnace, putting sodium hypophosphite at the front end of the tubular furnace, and calcining in a mixed gas atmosphere of hydrogen and inert gas to obtain the intermediate layer. According to the lithium-sulfur battery intermediate layer prepared by the invention, under the synergistic effect of the sulfur vacancy and the heterojunction structure, the shuttle effect of polysulfide is inhibited, and the catalytic conversion of sulfur species is accelerated, so that the phase change conversion of sulfur is realized, and the practical lithium-sulfur battery with stable long-term performance is realized.

The application discloses a chemical hydrocracking catalyst and a preparation method and application thereof. The chemical hydrocracking catalyst contains 25-60%, preferably 30-50% of modified EMT molecular sieve based on the weight of the catalyst, and the modified EMT molecular sieve has the following properties: a silicon-aluminum ratio (molar ratio of SiO2 / Al2O3) of 10-30, preferably 15-20, a pyridine infrared acid amount of 0.5-1.2 mmol / g, preferably 0.7-1 mmol / g. The preparation method of the hydrocracking catalyst comprises mixing the modified EMT molecular sieve, a binder and a hydrogenation active metal to obtain the chemical hydrocracking catalyst or loading the hydrogenation active metal on the modified EMT molecular sieve and the binder after shaping to obtain the chemical hydrocracking catalyst. The hydrocracking catalyst has the advantages of high reaction activity, high product liquid yield, high heavy naphtha fraction yield, high aromatic potential of the heavy naphtha, low tail oil BMCI value and the like in a heavy oil hydrocracking process.

The invention belongs to the technical field of composite materials, and particularly relates to a spherical C-coated MnO composite material and a preparation method and application thereof. The invention synthesizes a transition metal oxide and carbon composite material (C (at) MnO core-shell structure catalyst with uniform size. The transition metal oxide prepared by the invention enhances the catalytic conversion of polysulfide, the uniform spherical structure has a physical limiting effect on the polysulfide and is beneficial to inducing uniform deposition of lithium ions, and the internal C material can stabilize the material structure in long circulation and prolong the service life.

This invention relates to a hollow molybdenum diselenide microsphere and its preparation method. The product is prepared by the following steps: ammonium molybdate is weighed and dissolved in deionized water, stirred until completely dissolved; dopamine hydrochloride is then added to the resulting solution and stirred until homogeneous; anhydrous ethanol is added to the resulting solution and stirred until homogeneous; ammonia is added dropwise to the resulting solution; the resulting solution is allowed to stand at room temperature for a period of time, washed, and dried to obtain a precursor; the obtained precursor and selenium powder are placed in an inert atmosphere and calcined in a sealed environment, then naturally cooled to room temperature to obtain the hollow molybdenum diselenide microsphere. The beneficial effects of this invention are: it can suppress the shuttle effect of polysulfides through strong electronic interactions with polysulfides, promoting the catalytic conversion process of polysulfides, making it an ideal high-efficiency electrocatalyst; simultaneously, the hollow structure can physically confine polysulfides, thereby effectively suppressing the shuttle effect of polysulfides.

The invention relates to an iron oxide-cerium oxide composite material and a preparation method and application thereof.The preparation method comprises the steps that etched Fe3O4 (at) C is coated with rare earth elements in an alkaline environment, and cerium oxide distribution sites are prepared by controlling the difference of reaction steps; the invention also discloses an iron oxide-cerium oxide composite material with a yolk-eggshell nano-structure with an excellent heterojunction tandem catalytic interface and an iron oxide-cerium oxide composite material with a yolk-eggshell nano-structure. The rare earth element Ce with an electron-rich 4f internal valence orbit is utilized, f orbit electron spinning causes increase of electronic states near dxz / yz, a pi bond formed by dxz / yz and px / y hybridization is enhanced, d-p hybridization is promoted, and the d orbit and the p orbit are overlapped to the maximum when interacting with LiPSs. When the composite material is applied to lithium-sulfur batteries, f-d-p orbits are coupled and interact with LiPSs, f-d-p hybridization is generated, 4f orbits are activated, catalytic action is exerted, and reaction activity is improved, so that the composite material has high reversible capacity, good rate capability, long cycle life and competitive area capacity under high-sulfur load when being applied to the lithium-sulfur batteries.