42results about How to "Many catalytic sites" patented technology

The invention discloses a preparation method and application of nano nickel phosphide. The preparation method comprises the following steps: dissolving an anion type surfactant, soluble nickel salt and a reducing agent into distilled water, and evenly stirring; adding simple substance phosphorus; heating to 130-170 DEG C; reacting for 6-15 hours; cooling to the room temperature, and washing for multiple times with absolute ethyl alcohol and deionized water; and drying the product to the constant weight in a vacuum drying oven at 50-60 DEG C to prepare the nano nickel phosphide. Compared with the prior art, the invention has the advantages that a simple water heating method is utilized, a phosphorus source is the simple substance phosphorus, and the temperature and time of the reaction arequite short, which is beneficial to industrial mass production. When the nano particles of the prepared nickel phosphide are used in the catalytic hydrogenation production of nitrobenzene, the hydrogenation of the nitrobenzene can be catalyzed at lower temperature and under lower pressure, the reusability is good and the industrial use value is high because of porous surface structure, large specific surface area and multiple catalytic activity points.

The invention provides a nitrogen-doped carbon nano-array/cobalt ferrite material obtained by calcining a polyaniline-iron-cobalt metal organic framework, the nano material is a double-metal oxide, and has a large specific surface area, a plurality of catalytic sites, and higher catalytic efficiency. The polyaniline-iron-cobalt metal organic framework has good compatibility with various metal ions, a uniform multi-metal spinel can be easily synthesized from the polyaniline-iron-cobalt metal organic framework, the double-metal oxide and a conductive polymer are combined, so that advantages of different types of electrode materials can be combined with each other, and at the same time, nitrogen-doped carbon can be formed by polyaniline calcination, conductivity is further improved, and the defects of poor conductivity and poor stability of iron-cobalt oxides can be solved.

The invention discloses a small bell type Fe3O4 nano-reactor, and preparation and application of the nano-reactor. The reactor takes Fe3O4 particles as a core, the surface of the core is coated with a silica gel layer by a Stober method to form a Fe3O4@SiO2 compound, the surface of the Fe3O4@SiO2 compound reacts in acetone by the aid of dicyclopentadienyl iron and H2O2 to form a Fe3O4/C shell, a Fe3O4@SiO2@Fe3O4/C compound is obtained, and finally, the silica gel layer is removed by ammonia water to obtain the small bell type Fe3O4 nano-reactor. Compared with a traditional heterogeneous Fenton catalyst, the small bell type structure effectively avoids catalyst agglomeration, and stability of the Fenton catalyst is enhanced.

The invention provides a catalyst used for fixed bed ethyne hydrochlorination reactions and a using method. According to the catalyst, industrial nitrogen-containing resin is used for soaking copper chloride or nitrogen-containing species by a primary wet impregnation method, and then specific temperature programmed calcinations are used for carrying out carbonization treatment under inert gases,and thus the catalyst is obtained. The catalyst has the characteristic that the nitrogen-containing resin is taken as a nitrogen-containing carbon source which is rich in pore structures, and the content of active centers is greatly improved by soaking copper chloride or nitrogen-containing species by the primary wet impregnation method. According to the method, compared with other preparation technologies, the preparation of active carbon and nitrogen doping are completed at one step, the synthetic procedure is simplified, and the energy sources consumed by high-temperature calcination are saved. The invention discloses the novel catalyst and a preparation technology thereof, the catalyst is applied into the fixed bed ethyne hydrochlorination reactions, and the catalyst has certain catalytic activity.

The invention discloses a loaded ultra-small Prussian blue analog and a preparation method and application thereof, belonging to the technical field of functional nanomaterials. The preparation method comprises the following steps: 1) mixing a trivalent metal compound, a divalent metal compound, a first solvent, a ligand and graphene for reaction and washing to prepare a graphene-loaded ultra-small Prussian blue analog; (2) dispersing a graphene-loaded ultra-small Prussian blue analog turbid liquid in the first solvent, and adding a reducing agent and an alkaline solution for mixing and reacting to prepare the graphene-loaded ultra-small Prussian blue analog after graphene reduction. The method can realize the synthesis of the graphene loaded ultra-small Prussian blue analog and the synthesis of the ultra-small Prussian blue analog. The loaded ultra-small Prussian blue analog prepared by the method is a Prussian blue analog and graphene composite structure, and can improve the electricity receiving capacity of the catalyst.

The invention discloses an iridic oxide/manganese dioxide combined electrode with a hierarchical structure and a preparation method thereof. The electrode comprises flake-shaped MnQ2 directly growing on a substrate and nano IrO2 particles, wherein strip-shaped MnO2 covers the surface of the flake-shaped MnO2, and the nano IrO2 particles are uniformly placed on the surfaces of the flake-shaped MnO2 and the strip-shaped MnO2. In the iridic oxide/manganese dioxide combined electrode prepared by the method provided by the invention, the MnO2 and the IrO2 have a synergistic catalytic action, and improvement of catalytic performance is facilitated, so that overpotential of a lithium-air battery can be effectively reduced; the MnO2 in the combined electrode has a hierarchical structure, and comprises two forms, so that the combined electrode has larger specific surface area, and can provide more catalytic sites, improvement of deposition of Li2O2 is further facilitated, and thus battery capacity is improved.

The invention discloses a ferric-copper oxide as well as a preparation method and an application thereof. The ferric-copper oxide is prepared from a potassium ferricyanide solution and a copper ion solution through a reaction and heat treatment. The ferric-copper oxide has the advantages of large specific surface area, multiple catalytic sites, high catalysis efficiency and the like, has better magnetism, is easy to separate and reutilize and also has the advantages of low preparation cost, environmental friendliness and the like. The preparation method of the ferric-copper oxide has the advantages that raw materials are widely sourced, the production cost is low, the preparation process is simple, operation is simple and convenient, the energy consumption is low, no toxic or harmful substances are produced, the preparation method is environmentally friendly and the like. The ferric-copper oxide can serve as a catalyst of a Fenton-like reaction, can be used for treating antibiotic wastewater, has the advantages of being simple and convenient to operate, lower in cost, high in treatment efficiency, good in treatment effect, low in adding dosage of chemical agents, environmentally friendly and the like, the defect that iron precipitates can be produced with a conventional Fenton oxidation method can be overcome, and the ferric-copper oxide has good application prospects.

The invention relates to a method for advanced treatment of chemical waste water through SKL three-phase catalytic oxidation and BAF. The method comprises: leading waste water into an SKL three-phase catalytic oxidation reactor for reaction; leading the obtained water into an adjusting stabilization pond; leading the obtained water into a biological aerated filter; and finally leading the obtained water out. Chemical waste water subjected to "physicochemical and biochemical" secondary treatment is pumped into the SKL three-phase catalytic oxidation reactor. The waste water subjected to magnetization pre-treatment reacts with a solid-phase catalyst SKL-A and an oxidant for a catalytic oxidation reaction, and an ultrasonic effect is adopted during the reaction process. Pollutants hard to degrade in the chemical waste water are subjected to chain scission and ring opening, the water content is further regulated for reaction improvement, and the obtained water is led into the biological aerated filter for biochemical treatment. Defects of a limited processing load, high operation cost, large investment, and little project experience in a conventional method are overcome. Through adoption of magnetization pre-treatment in the method, the chemical reaction speed and reaction degree are significantly increased; loss of the solid-phase catalyst and the application amount of the oxidant are reduced; and the operation cost is greatly reduced.

The invention relates to the technical field of sewage treatment, in particular to a preparation method of an activated carbon-based ferromanganese oxide film for catalytic oxidation of NH4<+>, and the activated carbon-based ferromanganese oxide film and deamination application thereof. The preparation method comprises the following preparation steps: preparing a manganese sulfate solution, putting activated carbon into the manganese sulfate solution, carrying out soaking, and then performing draining to obtain manganese sulfate-loaded activated carbon; preparing a potassium permanganate solution, putting the activated carbon loaded with manganese sulfate into the potassium permanganate solution, and successively conducting soaking and draining to obtain activated carbon-based birnessite;and preparing a mixed solution of manganese sulfate and ferrous sulfate, carrying out air aeration on the mixed solution, putting the activated carbon-based birnessite into an organic glass adsorptioncolumn, and circularly pumping the aerated mixed solution into an organic glass adsorption column to obtain the activated carbon-based ferromanganese oxide film. The activated carbon-based ferromanganese oxide film can catalytically oxidize NH4<+> at normal temperature to obtain a clean product, namely nitrogen; and preparation process is simple and quick, cost is low, and industrial amplification is facilitated.

The invention discloses a preparation method of a three-dimensional porous Rh-Ir alloy dendritic crystal nanoflower, as well as a material obtained by the preparation method and the application of thematerial as a hydrogen evolution catalyst. The method comprises the following steps that polyallylamine serves as a morphology regulating agent, rhodium salt and iridium salt serve as precursors, ethylene glycol and polyallylamine hydrochloride are mixed to be uniform, then a precursor solution of rhodium and iridium is added, and the three-dimensional porous Rh-Ir alloy dendritic crystal nanoflower is obtained through hydrothermal method reduction. Compared with the traditional preparation method, the method provided by the invention is simple in process operation and easy to synthesize, thedeionized water can be used for removing heteroions and excess morphology regulating agent in the solution, and the excess morphology regulating agent is a recyclable green chemical reagent, so thatthe method is environment-friendly and pollution-free. The three-dimensional porous Rh-Ir alloy dendritic crystal nanoflower prepared through the method is not larger than 60 nm in diameter, single inmorphology and extremely high in purity, has the advantages of being large in specific surface area, multiple in active sites, good in electron conductivity, stable in structure and the like, and shows excellent electro-catalytic activity on hydrogen evolution.

The invention discloses a Pt or Au modified porous PdFe intermetallic compound, and a preparation method and an application thereof, and belongs to the technical field of electrochemistry. An intermetallic compound is a nanoparticle; an inner core of the nanoparticle is an ordered PdFe intermetallic compound; the surface of the nanoparticle is of a porous structure with uniformly distributed Pd; and the surface of the porous structure is modified with Pt or Au. The preparation method comprises the steps of using palladium acetate and ferric salt as metal sources, and loading the metal sourceson a carbon carrier; then thermally decomposing acetate in a protective atmosphere to obtain a supported PdFe intermetallic compound; and after Fe on the surface is etched away, adopting a surface modification technology to prepare the Pt or Au modified PdFe intermetallic compound with the porous surface and the ordered inner core. The Pt or Au modified porous PdFe intermetallic compound preparedby the method shows relatively high activity and stability as a negative oxygen reduction reaction catalyst and a positive hydrogen oxidation reaction catalyst of a fuel cell.

The invention discloses a cobalt-vanadium-based self-supporting electrode and a preparation method and application thereof, and belongs to the technical field of water electrolysis hydrogen production. Cobalt chloride and ammonium metavanadate are used as sources of cobalt and vanadium respectively, a coralline-shaped nano array precursor is synthesized on a conductive substrate through a one-step hydrothermal method, and a CoN/VN-coated NF self-supporting electrode is obtained through subsequent nitriding treatment. According to the preparation method, the subsequent treatment that the catalyst is attached to the electrode through a post-coating process and addition of an adhesive and a conductive agent is avoided, the electrode preparation process is simplified, the cost is reduced, the substrate material is of a foam structure, the catalyst can be riveted and dispersed, high loading of active components is achieved, and therefore rich catalytic sites are provided. The obtained electrode has good hydrogen evolution activity and stability, especially when the current density is increased, the hydrogen evolution activity of the electrode gradually approaches commercial Pt/C, and the electrode has the potential of large-scale production.

The invention discloses a two-dimensional Ni-Ir porous nanosheet and a preparation method and application thereof. The preparation method comprises the steps that nickel cyanide and iridium salt serve as precursors, a Hoffman type complex precursor of a two-dimensional layered structure is prepared through oil bath heating, and after high-temperature calcination oxidation, the Hoffman type complex precursor is reduced under a specific electrochemical window to obtain the two-dimensional Ni-Ir porous nanosheet. Compared with a traditional preparation method, the method disclosed by the invention is simple in process operation, heteroions in the solution can be removed by using deionized water, greenhouse gases cannot be released in the calcination oxidation process, and the electrochemical reduction process is clean, environment-friendly and pollution-free. The two-dimensional Ni-Ir porous nanosheet prepared by the method is extremely high in purity, has the advantages of large specific surface area, multiple active sites, good electron conductivity, stable structure and the like, and shows excellent electrocatalytic activity on oxygen evolution.