76results about How to "More active sites" patented technology

The invention discloses a nitrogen-sulfur double-doped non-metallic carbon-based oxygen reduction catalyst with grading holes and preparation and belongs to the technical field of catalysts. An organic polymer with nitrogen, sulfur and carbon in uniform distribution is synthesized through a simple method, the organic polymer is further subject to high-temperature calcination, a carbonization process, a nitrogenization process and a sulfurization process are completed simultaneously, and then the nitrogen-sulfur double-doped grading hole carbon material is prepared. The material has a grading hole structure under the condition of not using a template, the specific surface area is large, the synthesis method is simple, the raw materials are easy to obtain, cost is low, and the material has efficient oxygen reduction reaction catalytic activity and good stability and has broad application prospects in the fields of metal-air cells, regenerative fuel cells, etc.

A process for preparing the catalyst SO4/TiO2 by supercritical drying method includes slowly dropping the sulfuric acid-alcohol-water solution in butyl titanate-alcohol solution to obtain TiO2 sol, ageing to obtain wet gel, mixing it with alcohol, staying in inertial atmosphere and supercritical condition for 0.5-8 hr, cooling and calcining. Its adantages are high specific surface area and photocatalytic activity, and long service life.

The present invention discloses a hydrocracking catalyst intermediate, a hydrocracking catalyst, and preparation methods of the hydrocracking catalyst intermediate and the hydrocracking catalyst. According to the present invention, the hydrocracking catalyst intermediate comprises a hydrogenation activity metal component, a carrier containing an acid cracking component, and a specific organic compound, and does not require a hydrogen sulfide generation reaction and a vulcanization reaction between hydrogen sulfide and an active metal during calcination vulcanization, such that the problem that the temperature increase is too rapid during the traditional catalyst vulcanization process can be avoided; and the hydrocracking catalyst has advantages of complete vulcanization, good metal dispersibility, and good hydrogenation property.

The invention provides a molybdenum platinum porous composite material as well as a preparation method and application thereof. The preparation method comprises the following steps that a carbon nanotube is added into a solvent; turbid liquid is formed through ultrasound, and is then dripped on the surface of a pretreated glassy carbon electrode; a carbon nanotube thin layer is formed; a glassy carbon electrode is obtained; the glassy carbon electrode modified by the carbon nanotube is put into electroplating liquid to implement the electroplating; cleaning and natural drying are performed; then, the glassy carbon electrode containing a molybdenum sulfide carbon nanotube composite material is put into a sulfuric acid solution; pt is used as a counter electrode; a saturated calomel electrode is used as a reference electrode; under the certain condition, the glassy carbon electrode coated with a molybdenum platinum/carbon nanotube composite material is obtained; the glassy carbon electrode is cleaned by water and is naturally dried at normal temperature; the composite material is scrapped from the surface of the glassy carbon electrode to obtain a final product. The operation of themethod is simple; the prepared composite material has great advantages in the aspects of electrocatalysis hydrogen production, electrocatalysis oxygen evolution, electrocatalysis oxygen reduction andenergy conversion; the composite material can be applied to the fields of fuel battery and new energy source conversion.

The method for preparing Nano electrocatalyst includes steps: using chloro platinic acid, sodium chloroplatinate, water solution of potassium chloroplatinate, or chloro platinic acid, sodium chloroplatinate, water solution of potassium chloroplatinate and ruthenium chloride as raw materials; adding active carbon into the said material to adsorb noble metals; adding ethanol, propanol or isopropyl alcohol to carry out decentralization effect; pH value of mixed liquor is adjusted through alkaline solution so as to obtain liquor of raw materials. Deoxidation liquor is prepared by using deionized water to blend reducing agent: sodium borohydride and potassium borohydride. Under carrying current of nitrogen gas or argon gas, liquor of raw materials through spraying pen is jetted to the deoxidation liquor to deoxidize noble metal ion, which then passes through filtering, washing and drying procedures.

The present invention relates to a preparation method of an electrocatalyst carrier for fuel cells. The electrocatalyst carrier is prepared from raw materials of expanded graphite with BET surface area of no less than 100m<2> / g and average pore size of no less than 10 nm through high temperature calcination, hole plugging treatment and drying treatment; and the obtained carrier has BET specific surface area of no less than 120m<2> / g and average pore size of 8-16 nm. Compared with the traditional carbon materials, the electrocatalyst carrier has larger specific surface area, is easier to capture and uniformly disperse nano Pt particles, also has high better potential stability. The Pt / C electrocatalyst prepared by using the treated worm-shape expanded graphite as carrier preparation has the advantages of multiple active sites, high activity and stability.

The invention relates to a preparation method of a porphyrin-based metal organic framework material sensitized oxide type catalyst. The porphyrin-based metal organic framework material sensitized oxide type catalyst is used for visible light catalytic degradation treatment of organic pollutants in water. A porphyrin-based metal organic framework material is used as a sensitizer, silver-cerium double-doped zinc oxide is used, and a sensitizing auxiliary agent is introduced, so that a photo-generated charge transmission channel is constructed, and the photocatalytic degradation performance undera visible light condition is enhanced. By investigating the degradation performance of the composite catalyst on a typical organic pollutant methylene blue in water under a visible light condition, the catalyst has good capacity of degrading organic matters in water under visible light.

The invention provides a multi-duct transition metal phosphide carbon nanotube composite material and a preparation method and application based on small molecule regulation. A mixture of carbon nanotubes and small molecules is added into a solvent, ultrasound treatment is carried out to form turbid liquid to be dropwise added into a pretreated glassy carbon electrode surface, natural drying is carried out to form even carbon nanotube thin layers, and a glassy carbon electrode modified with the mixture of the carbon nanotubes and the small molecules is obtained; phosphate and transition metalsalt are added into deionized water, electrolyte is supported, sulfuric acid is used for adjusting pH to be 0-13, and electroplate liquid is obtained; and the glassy carbon electrode modified with themixture of the carbon nanotubes and the small molecules is placed into the electroplate liquid to be electroplated, washing with water is carried out, natural drying is carried out at the normal temperature, and a blade is used for scrapping a prepared composite material from the surface of the glassy carbon electrode, and the final product is obtained. The method is easy to operate, the preparedcomposite material has the great advantages in the aspects of catalytic hydrolysis separation and energy conversion, and the product and the preparation method can be applied to the field of electro-catalysis water decomposition hydrogen production and photovoltaic conversion.

The invention relates to a modified hydrotalcite-like derived cobalt catalyst, general formula being M/M1(O)-M2(O)-M3(O), wherein M represents Co, M1 represents an alkaline earth metal, M2 representsa rare earth metal, M3 represents Al, n(Co+M1)/n (Al+M2)=2-4, the molar ratio of Co to M1 is 0.5-1.5, and the molar ratio of M2 to Al is 0.005-0.05. The preparation method comprises the following steps: dissolving various metal salts and urea in water to form an aqueous solution, crystallizing the aqueous solution to obtain a solid-liquid mixture, filtering the solid-liquid mixture, respectively washing with water and a modifier, dispersing the mixture in the modifier, carrying out ultrasonic treatment, and filtering and drying the product to obtain a modified hydrotalcite-like precursor; androasting and reducing the precursor to obtain the catalyst. The catalyst is used for synthesizing cyclohexylamine through aniline hydrogenation, the aniline conversion rate can reach 98% or above, andthe dicyclohexylamine selectivity is 3% or below.

The invention belongs to the field of electrocatalytic materials, and discloses a synergistically modified composite electrocatalyst and an application thereof in ethanol oxidation. The composite electrocatalyst is composed of an active noble metal phase and a basic carbonate matrix phase, wherein the active noble metal phase is dispersed and distributed on the surface of the basic carbonate matrix phase with a nanowire structure in the form of fine nanoparticles. The synergistic modified composite electrocatalyst provided by the invention optimizes intrinsic activity, the number of active sites and electrical conductivity at the same time. Based on synthesis of the matrix phase with a nanowire structure, the noble metal oxide phase is deposited on the surface of a nanowire through hydrolysis, and finally, the active metal phase is selectively reduced by regulating and controlling the heat treatment condition, so that the active metal phase is combined with the basic carbonate matrix to construct synergistic catalytic active sites, and the obtained composite electrocatalyst has high intrinsic activity, rich active sites and good electrical conductivity. And the electrochemical oxidation reaction of ethanol can be efficiently and stably catalyzed under an alkaline condition.

The invention discloses nitrogen-doped mesoporous carbon prepared by using calcium cyanamide as well as a preparation method and application of the nitrogen-doped mesoporous carbon. The preparation method concretely comprises the following steps: mixing a carbon source with the calcium cyanamide, then mechanically grinding the mixture, adding water and kneading for lumping, placing at the room temperature for 8-14 hours under the condition of ventilating, and carrying out pre-carbonizing treatment for 8-12h at 80-100 DEG C; placing the obtained pre-carbonized sample in a tube furnace, heatingup to 400-1000 DEG C under a flowing inert atmosphere, then carrying out heat preservation for 1-5h for deep carbonization treatment, and naturally cooling to obtain the nitrogen-doped mesoporous carbon having partial calcium ions on the surface. The preparation process is simple and easy to repeat, a nitrogen source does not need to be additionally added in a preparation process, and the subsequent steps of pore broadening and removing templates are omitted, so that the method is suitable for large-scale production; the obtained nitrogen-doped mesoporous carbon is used as a solid base catalyst or a catalyst carrier, and shows an excellent catalytic activity in preparation of long chain alkanes by means of condensation and hydrogenation of aldehydes and ketones.

The invention belongs to the technical field of anticorrosive paint, and particularly relates to anticorrosive paint applied to ships and a preparation method of the anticorrosive paint. The anticorrosive paint applied to the ships is prepared from the following raw materials in parts by weight: 40-60 parts of epoxy resin, 5-15 parts of a modified basalt flake/carbon nitride composite material, 3-8 parts of a samarium and copper co-doped zinc oxide/graphene composite material, 10-18 parts of filler, 1.5-6 parts of an auxiliary agent and 20-30 parts of water. The anticorrosive paint applied to the ship can solve the practical problem that the ship needs bacteriostasis and corrosion prevention, has excellent adhesive force and good wear resistance, can bear high and low temperature and high salinity, can well resist bacterial corrosion, and achieves bacteriostasis and corrosion prevention effects.

The invention discloses a preparation method of a graphite spherical shell sheet, and belongs to the technical field of materials. According to the method, polystyrene spheres are used as a template,glucose is used as a carbon precursor, iron (or cobalt, nickel) is used as a graphitization catalyst, the template is removed through microwave heating, a glucose layer is partially carbonized, oxidized and broken, and then high-temperature carbonization and graphitization are performed to obtain the graphite sphere shell sheet. Compared with a hollow material, the prepared graphite ball shell sheet of the invention can fully expose the internal and external specific surface areas of the hollow graphite ball so as to improve the active site concentration and the material transmission performance, and the thickness of the graphite ball shell sheet can be controlled to be about 10 layers so as to achieve the category of graphene.

The invention discloses a nitrogen-sulfur double-doped porous carbon material catalyst and a preparation method thereof, and relates to the technical field of carbon catalytic preparation. According to the nitrogen and sulfur double-doped porous carbon material catalyst and the preparation method thereof, the porous carbon material comprises a nitrogen and sulfur source and a carbon source with the mass ratio of 1%-50%, the carbon source is glucose, the nitrogen and sulfur source is cysteine, and a non-metal nitrogen and sulfur double-doped porous carbon material is prepared through a hydrothermal method and a high-temperature alkali activation method. The co-doping of nitrogen and sulfur not only ensures the catalytic stability of the catalyst, but also promotes the adsorption and catalytic degradation of antibiotic organic pollutants through the synergistic effect of nitrogen and sulfur, and the catalytic performance is better than that of a single element doped carbon material. The raw materials for preparing the catalyst are green, pollution-free and easy to purchase, the cost is low, the preparation process is simple, large-scale production is easy, and the catalyst can be applied to the fields of environmental organic polluted water treatment, drinking water deep purification treatment and the like.

The invention discloses a preparation method of a heavy oil hydrodemetallization catalyst, and the method comprises the following steps: (1) pulverizing a waste hydrotreating catalyst, and roasting; (2) soaking the material obtained in the step (1) into an ammonium bicarbonate aqueous solution, carrying out sealed heat treatment, drying, soaking with a polyethylene glycol solution, and drying to obtain a pretreated material A; (3) performing high-temperature activation treatment on kaolin, then soaking into an ammonium bicarbonate aqueous solution, performing sealed heat treatment, and dryingthe material subjected to heat treatment to obtain a pretreated material B; and (4) kneading and molding pseudo-boehmite, the pretreated material A and the pretreated material B, drying and roasting the molded product to obtain a carrier, and loading a hydrogenation active component onto the carrier to obtain the catalyst. According to the method, the hydrodemetallization catalyst is prepared fromthe waste catalyst and kaolin, environmental pollution is reduced while the production cost is reduced, the content of macropores of the hydrodemetallization catalyst is appropriate, and the hydrodemetallization catalyst has high hydrodemetallization activity and hydrodesulfurization activity.

The invention provides an application of a supported platinum nano-cluster catalyst in an alkane anaerobic dehydrogenation reaction. The catalyst takes an oxide as a carrier and platinum nano-clusters as an active component, the platinum nano-clusters are monodispersed on the oxide carrier, and the platinum nano-clusters are composed of ligands and platinum atoms; the ligand is at least one of organic phosphorus and mercaptan; the platinum atoms are diatoms or polyatoms. The preparation method of the catalyst comprises the following steps: (1) preparing a diatomic or polyatomic platinum nano-cluster; (2) loading the diatomic or polyatomic platinum nano-cluster on the carrier; and (3) post-treatment of the catalyst. The catalyst prepared by the method has high-dispersion nanoscale platinum nano-clusters, and has high selectivity to olefin in the anaerobic dehydrogenation reaction of alkane such as propane and the like.

The invention relates to photocatalytic decomposition water materials and in particular relates to a dual-channel Z-configuration photocatalytic decomposition water composite material and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps: with carbon nitride as a precursor material, adding sheet molybdenum disulfide to serve as a high-conductivity solid-state electron transport medium, enabling the two to perform effective assembly, and enabling nano-silver phosphate particles to uniformly grow on a composite matrix of carbon nitrideand sheet molybdenum disulfide by virtue of an ion exchange method, thereby obtaining a three-system composite material having the characteristics of being excellent visible light absorption, low in catalytic stability and high in photocatalytic efficiency. The defects that a composite catalyst prepared by a conventional method is weak in visible range response and slow in charge separation and migration and an ionic electron transport medium used in the traditional Z-configuration photocatalytic composite system easily causes side reactions and is low in material compounding uniformity are overcome.

The invention belongs to the technical field of preparation methods of Fischer-Tropsch synthesis catalysts, and specifically discloses a preparation method of a cobalt-based Fischer-Tropsch synthesis catalyst with controllable mono-dispersed particles. The method is characterized in that an anhydrous ethanol, distilled water and carboxyl-containing organic matter mixed solvent combined according to a controlled ratio are used as a solvent to dissolve an active component with a meso-porous material with a special morphology as a carrier, the solvent is added to the meso-porous in a dropwise controlled manner, and the obtained material is dried and roasted to obtain the catalyst. The cobalt particles of the catalyst prepared in the invention have the characteristics of controllable size, mono-dispersion, and high dispersion because of the interaction of anhydrous ethanol, distilled water, the organic matter and a cobalt source, wherein the anhydrous ethanol, distilled water and the organic matter are indispensable. The catalyst prepared in the invention has the characteristics of high reaction activity, good stability, high selectivity of heavy hydrocarbons, low methane selectivity, difficult sintering and the like in the Fischer-Tropsch reaction, and the preparation method is obviously better than routine preparation methods.

The invention relates to high-silicon Y zeolite and a preparation method thereof. The preparation method comprises the following steps of: adopting industrial high-silicon NaY zeolite as a growth carrier, adopting a silicon source, an aluminium source, a guiding agent and distilled water as reaction materials, without adding any template agent, carrying out hydrothermal crystallization reaction toprepare and obtain a zeolite material which uses 0.6-1.0mum single-crystal NaY zeolite particles as a core phase and uses polycrystal zeolite aggregate formed by 50-400nm nano Y zeolite particles asa shell layer. The high-silicon Y zeolite and the preparation method have the beneficial effects that the catalytic activity of the prepared high-silicon Y zeolite in macromolecular catalytic reactionis obviously improved, and in cracking of triisopropylbenzene, the conversion rate is increased by 20-55% compared with industrial high-silicon NaY zeolite.

The invention relates to an aromatic hydrocarbon methylation catalyst and a preparation method thereof. A purpose of the present invention is mainly to solve the problems of poor stability, low reaction conversion rate, difficulty in preparation and the like of the aryl methylation catalyst in the prior art. According to the present invention, an ammonium type ZSM-5 nano-sheet catalyst is used, and comprises, by weight, a) 5-95 parts of an ammonium type ZSM-5 nano-sheet molecular sieve material, b) 95-5 parts of a binder, and c) the balance of a metal compound; and the catalyst can be used inthe industrial production of aromatic hydrocarbon methylation.

The invention relates to the field of composite material preparation, and provides a method for regulating and controlling a FeS2/reduced graphene oxide compact assembly structure in order to solve the problem that introduction of a Faraday capacitor material into graphene limits rapid ion transmission and the like. The method comprises the following steps of: (1) synthesis of a Mil88 metal organic framework; (2) preparation of Mil88/GO/S powder; and (3) preparation of compact FeS2/reduced graphene oxide. The preparation method is efficient and stable in process, simple in flow and capable ofeffectively saving energy, preparation of a compact FeS2/reduced graphene oxide electrode can be achieved, meanwhile, a channel for rapid transmission of sodium ions is also considered, and thereforethe volume desalination capacity of the material is greatly improved; and the prepared compact FeS2/reduced graphene oxide composite material shows excellent electrochemical activity and stability ina capacitive deionization technology under conventional conditions.