63results about How to "High active site density" patented technology

The invention belongs to the field of fuel cell electrocatalysts, and provides a preparation method and application of a porous composite material electrocatalyst based on bimetallic macrocyclic compound. The method comprises the steps of: stirring transition metal salt, a nitrogen-containing organic ligand and a metal macrocyclic compound according to a certain proportion at the temperature of 0-80 DEG C by adopting simple solution reaction and performing reaction for a certain period of time, so that the metal macrocyclic compound is embedded into a pore channel formed by the metal salt andthe organic ligand to serve as a precursor material, and the final catalyst is obtained through high-temperature heat treatment. The material is high in porosity, the metal macrocyclic compound is embedded, the active site density is remarkably improved, and particle aggregation and hole collapse in the high-temperature pyrolysis process are avoided. Compared with the traditional non-noble metal electrocatalyst, the material has higher oxygen reduction catalytic activity under acidic and alkaline conditions.

The invention discloses an efficient photo-catalytic reactor which comprises an upper cover plate and a base. The upper cover plate is arranged on the base, the efficient photo-catalytic reactor is characterized in that a first rectangular concave plane is formed in the upper end surface of the base, conducting glass is placed in the first rectangular concave plane, and a photocatalyst is arranged on the upper surface of the conducting glass; the photocatalyst is a nanorod array thin film photocatalyst; a second rectangular concave plane is formed in the lower end surface of the upper cover plate and corresponds to the first rectangular concave plane in position; an inverted micro boss array is arranged in the second rectangular concave plane; the upper cover plate is provided with a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet communicate with the second rectangular concave plane through micro fluid input channels and micro fluid output channels correspondingly; and the micro fluid input channels and the micro fluid output channels are formed in the upper cover plate. The efficient photo-catalytic reactor provided by the invention is simple in structure, easy to mount, low in cost, high in reaction efficiency and capable of being widely applied to the fields of energy, environment protection and the like.

The invention belongs to the technical field of preparation of anticorrosive coatings, and particularly relates to a preparation method and application of a modified anticorrosive super-hydrophobic integrated coating, the method comprises the following steps: respectively preparing a graphene titanium dioxide compound from graphene and tetrabutyl titanate, preparing a zinc-aluminum hydrotalcite anticorrosive material from sodium metavanadate, zinc chloride and aluminum chloride, preparing a PDMS organic emulsion from polydimethylsiloxane and tetrahydrofuran, then performing surface modification on the graphene titanium dioxide compound through dopamine hydrochloride and a zinc-aluminum hydrotalcite anticorrosive material to obtain a dopamine modified composite material, and finally, preparing the modified anticorrosive super-hydrophobic integrated coating from the dopamine modified composite material and a PDMS organic emulsion. Performance tests show that compared with a conventionalmarine anticorrosive coating, the coating prepared by the invention has better anticorrosive and super-hydrophobic effects, is applied to the field of marine corrosion prevention, and can effectivelyprolong the service life of the coating on a protective substrate.

The invention discloses an iron-nitrogen doped hollow porous carbon material and a preparation method thereof, and relates to a synthesis technology of porous materials. The preparation method comprises the following steps: (1) synthesizing SiO2 spheres; (2) preparing SiO2 modified by polyelectrolyte; (3) preparing an iron-doped ZIF-8 coated polyelectrolyte modified SiO2 composite material; and (4) preparing an iron-nitrogen doped hollow porous carbon material. The iron-nitrogen doped hollow porous carbon material prepared by the preparation method disclosed by the invention is uniform in size, has good ORR catalytic activity and stability, and is lower in price compared with a traditional Pt/C catalyst.

The invention discloses a preparation method of porous multi-branch Pt-Ni-Cu alloy nanoparticles. The invention takes chloroplatinic acid, copper chloride and nickel chloride as raw materials, glycineand PVP as dual reducing agents, adopts specific addition amount of 1, 3- propylene glycol and NaF, the porous and multibranched Pt-Ni-Cu alloy nanoparticles which are highly selective are prepared through a microwave synthesis method, and the preparation method is green and efficient. The porous multibranched Pt-Ni-Cu alloy nanoparticles have many step atoms and high active site density, which show excellent electrochemical activity of methanol and formic acid, and have wide application prospects.

The invention relates to the technical field of alkylation catalyzed by acidic polymerized ionic liquids, and particularly relates to a method of preparing alkylate oil by utilizing a Lewis acid based acidic polymerized ionic liquid catalyst. A polymerized ionic liquid acidified by adopting a Lewis acid is adopted as the catalyst of the method, and a continuous catalytic liquid-phase butane/butylenes alkylation reaction is performed at 20-200 DEG C by adopting a fixed bed reactor. The catalyst is easy to prepare, durable in activity, convenient to regenerate and free of generation of waste acids, thus achieving green alkylation.

The invention relates to a realization method for improving the electrooxidation activity of a formic acid fuel cell. Formic acid electrooxidation test is cyclic voltammetry test in a 0.5 M H2SO4 and0.25 M HCOOH electrolyte, prepared polygonal PtCoFe is used as a formic acid fuel cell electrooxidation catalyst, PtCoFe alloy nano-particles having a high selectivity and a polygonal morphology are prepared in a hydrogen reducing atmosphere through using chloroplatinic acid, cobalt chloride and iron trichloride as raw materials, PVP as a reducing agent and a protecting agent and adding specific amounts of CTAB and NaBr, and the preparation process is green and clean. The obtained polygonal PtCoFe alloy nano-particles have the advantages of many step atoms, high active site density, excellentelectrocatalytic activity in formic acid fuel cell electrooxidation catalysis experiments, and wide application prospect.

The invention belongs to the technical field of application of an energy storage material, and gives out a nanometer composite oxygen electrode material. The nanometer composite oxygen electrode material comprises a carbon nanotube, wherein the carbon nanotube is provided with a hollow inner cavity, the inner cavity is encircled by a carbon layer, metal particles are arranged in the inner cavity of the carbon nanotube, and heteroatoms are doped in the carbon layer. The nanometer composite oxygen electrode material is a core-shell nanometer tubular composite material, shows excellent oxygen catalytic capability and shows relatively high power density, energy density and stability when applied to a metal-air battery.

The invention belongs to the field of new nanomaterials, and in particular relates to a composite material carrying a Cu2O-CuO nanowire array and a preparation method thereof, a biosensor and application thereof. The invention uses copper foam as a substrate to prepare a Cu(OH)2 nanowire array by a room-temperature solvent-heat method, and prepares a three-dimensional composite material loaded with the Cu2O-CuO nanowire array by annealing in air by precisely controlling time and temperature. The preparation method is simple and easy to operate. CuO will consume the electrons on the Cu2O conduction band by the composite material under light to reduce the photo-generated electron-hole recombination rate. As a three-dimensional electrode, the Cu2O-CuO nanowire array has a large surface area,high active site density and low series resistance, which is conducive to the generation of optoelectronic signals. The biosensor made of the composite material is used for the detection of tyrosinase.

The invention provides a copper-based methanol synthesis catalyst and a preparation method thereof. The method includes the steps that copper-zinc mixed liquor is mixed with a first precipitator aqueous solution in a parallel flow mode, the pH is controlled to be 7-8, standing is performed for ageing, and slurry A is formed; a second precipitator aqueous solution is added into a soluble aluminum salt aqueous solution, the pH is controlled to be 7-8, the temperature is controlled to be 40-50 DEG C, standing is performed for ageing, and slurry B is obtained; the slurry A and the slurry B are mixed and filtered, a solid phase is washed, dried, roasted and formed, and the copper-based methanol synthesis catalyst is obtained. According to the preparation method, the steps are simple, the controllability is high, the raw material source is wide, and industrialization is easy to achieve; by the adoption of the preparation method, the copper-based methanol synthesis catalyst with high catalytic activity and heat stability can be obtained and is suitable for producing methanol with synthesis gas containing CO, CO2 and H2 under the low temperature and low pressure conditions; besides, the catalyst does not need reduction before use and can be conveniently applied and popularized on a large scale.

The invention discloses a preparation method of an iron atom-loaded graphene-based nano material. The preparation method comprises the following steps of 1, adding 50-100mg of anhydrous ferric chloride into a 25ml volumetric flask, and adding tetrahydrofuran for dissolving to prepare a 3mg/ml ferric chloride solution; 2, taking 10-20 mg of graphene oxide and putting into the 25 ml volumetric flask, adding tetrahydrofuran for dissolution, and adding 126 mu L of the ferric chloride solution with the concentration being 3 mg/ml prepared in the step 1; 3, stirring the mixed solution in the step 2 on a magnetic stirrer for 12-36 hours until the solvent tetrahydrofuran is completely volatilized and a solid mixture is formed; and 4, grinding the solid mixture obtained in the step 3 into powder, putting the powder into a calcining vessel, putting the calcining vessel into a high-temperature furnace for calcining, raising the temperature from the room temperature 25 DEG C to 400-600 DEG C at the temperature raising rate of 1-10 DEG C/min, preserving heat for 1-3 hours, and then cooling to the room temperature. According to the present invention, the nano material with high active site density and high monatomic loading capacity is successfully prepared only by a one-step calcination method, and the inert atmosphere adopted for combustion is relatively safer and easy to realize.

The invention provides a sulfur-tolerant catalyst for synthesized gas methanation. The sulfur-tolerant catalyst is characterized by being prepared form 60-70 wt% of Mo, 23-35 wt% of S, 3-6 wt% of Al and 1-4.5 wt% of an auxiliary. The sulfur-tolerant catalyst has the advantages of being simple in preparation process, good in catalytic performance and high in methane selectivity.

A method for recovering a byproduct ethylbenzene in production of epoxypropane by using a co-oxidation method comprises the following steps: (1) sequentially inputting reaction liquid from a POCHP peroxide section and a hydrogenolysis reaction section into an ethylbenzene heavy component removal tower and an ethylbenzene light component removal tower to remove heavy components and light components so as to obtain an ethylbenzene-rich stream; (2) feeding the ethylbenzene-rich stream obtained in the step (1) into a rectifying tower for azeotropic distillation by taking water as an entrainer and filling a reaction section with a catalyst, taking an ethylbenzene azeotrope formed byethylbenzene in the ethylbenzene-rich stream and water as a tower top material to be extracted from the tower top; enabling the residual 1, 5-dimethyl-2, 4-dioxane to be subjected to ring-opening decomposition under the action of a catalyst in the reaction section, and discharging a decomposition product, together with cyclohexanol, cumene and water from a tower kettle as a tower kettle material; (3) coalescing and separating water from the tower top material obtained in the step (2) to obtain an ethylbenzene product; and (4) coalescing and separating water from the tower kettle material obtained in the step (2) to obtain waste oil, and discharging the waste oil. According to the recovery method, high-purity recovery of the byproduct ethylbenzene can be realized, and the recovery rate is high.

The invention discloses a preparation method of electronic grade propylene glycol monomethyl ether and a product obtained by the preparation method, and belongs to the technical field of preparation of fine chemicals. The method comprises the following steps of: 1) mixing methanol, propylene oxide and a basic ionic liquid catalyst, and carrying out reaction in a micro-channel reactor to obtain a reaction solution; 2) removing light components from the reaction solution to obtain a light component removed reaction solution; and 3) evaporating the light component removed reaction solution obtained in step 2), and performing negative pressure rectification on the obtained steam to obtain the electronic grade propylene glycol monomethyl ether. The preparation method of the electronic grade propylene glycol monomethyl ether provided by the invention are mild in reaction conditions, the purity of the prepared product is high, the yield is high, and the activity and selectivity of the catalyst are high.