289 results about "Carbocatalysis" patented technology

The invention provides a preparation method and an application of a nitrogen and phosphorus co-doped porous carbon catalyst and belongs to the field of oxygen reduction catalysts for a fuel cell cathode. Nitrogen and phosphorus are introduced with an in-situ doping method, and the nitrogen and phosphorus doping amount is changed by adjusting the content of a nitrogen and phosphorus precursor. Besides, nitrogen and phosphorus co-doped porous carbon is prepared with a hard template method, and controllability of pore diameters of the porous carbon is realized by adjusting a hard template. The method comprises steps as follows: an earlier polymer of aniline monomers, a phosphorus precursor, a silica-based hard template and non-precious metal salt is prepared; the earlier polymer is calcined, and solids are obtained; the solids are etched, cleaned and dried, and the carbon material is obtained. More importantly, the prepared nitrogen and phosphorus co-doped porous carbon material has an excellent oxygen reduction electro-catalytic property under the acid condition and has huge application potential.

The invention discloses a polymer photocatalyst and a method of water-phase photo-catalytic selective alcohol oxidation. According to the invention, an organic polymer carbon nitride catalyst is prepared, and is applied in a water-phase photo-catalytic selective alcohol oxidation system. Compared with common ultraviolet catalyst TiO2, visible light catalyst TiO2-xNx, metal sulfide, metal nitride, metal nitrogen oxides, and the like, when alcohol is oxidized in water phase with a green oxidant air/oxygen under mild conditions, the carbon nitride catalyst is more stable and shows higher efficiency. The preparation method of the carbon nitride catalyst is simple and feasible, and the catalyst comprises no metal element, such that the catalyst is cheap. With the catalyst, alcohol oxidation aldehyde synthesis or ketone synthesis processes are simple and feasible, such that industrialized large-batch productions of aldehyde and ketone compounds can be facilitated.

The invention belongs to the field of preparation of electro-catalytic materials, and more particularly relates to a nickel-cobalt alloy@carbon nanotube composite material and preparation and application thereof. A precursor solution containing platinum, nickel and cobalt is mixed with a metal organic ligand solution, coordination reaction is carried out, solid-liquid separation is carried out after the reaction is finished to obtain a metal organic framework containing platinum, nickel and cobalt, washing and drying are carried out to obtain a dried metal organic framework; and the obtained metal organic framework is annealed in a reducing atmosphere, cleaning with dilute acid is carried out, separating and drying are carried out to obtain the platinum-nickel-cobalt alloy@carbon nanotubecomposite material. The composite material is used as a catalyst for an electrocatalytic oxygen reduction test, and is prepared into a full cell for a fuel cell test system, and the obtained catalyticperformance and stability are superior to those of the current commercial platinum-carbon catalyst. The preparation method of the material is simple, reaction conditions are mild, cost is low, the concept of green chemistry is met, and large-scale industrial production can be carried out through synthesis of the adopted in-situ organic framework.

The invention discloses a catalyst for a fuel cell and a preparation method of the catalyst. The catalyst is a nitrogen-hybridized carbon-based catalytic material containing one or more metals. The catalyst is an M-NC single-metal nitrogen-carbon catalyst, a double-metal nitrogen-carbon catalyst or a multi-metal nitrogen-carbon catalyst, wherein M is one or more of metal elements. The catalyst isof a large-volume pore structure, has excellent gas and electron conductivity, high graphitization degree and nitrogen content, large specific surface area, multiple active sites, uniform distribution, high activity and strong stability, has the advantages of high catalytic activity, long service life and low comprehensive cost, and can be used for proton exchange membrane fuel cells and direct alcohol fuel cells. In addition, the preparation method is simple in process, controllable in operation, mild in condition, environmentally friendly and high in universality, no solvent is used in the synthesis process, various raw materials are subjected to a solid-phase thermal reaction to directly form a precursor and then are carbonized, the raw material cost is low, and the utilization rate ishigh.

The invention relates to a spherical catalytic microelectrolytic environment-friendly material and a preparation method therefor. Aiming at the defects such as low reaction speed, low COD (Chemical Oxygen Demand) removal ratio, easiness in passivating and the like of the existing iron-carbon microelectrolytic materials, a special catalyst is added during the production of the spherical catalytic microelectrolytic environment-friendly material disclosed by the invention, the spherical catalytic microelectrolytic environment-friendly material is mainly prepared from 78-88wt.% of zero-valence active iron, 10-14wt.% of carbon, 1-5wt.% of catalyst and 1-3wt.% of auxiliary materials, is an iron, carbon and catalyst integrated composite spherical material and is prepared from fine iron powder, coal, the catalyst and a sintering agent through carrying out grinding and sieving, carrying out mixing and pelletizing, carrying out drying and canning, carrying out high-temperature reduction sintering and carrying out cooling and can discharging, wherein the catalyst is special compounded ceria, and the sintering agent is sodium tetraborate. During the treatment of a variety of high-concentration and toxic wastewater such as pharmaceutical wastewater, coking wastewater, petrochemical wastewater and the like, the reaction speed and COD removal ratio of the spherical catalytic microelectrolytic environment-friendly material are increased by 20-30% through the catalyst compared with those of the ordinary iron-carbon microelectrolytic materials.

The invention belongs to the field of electrocatalysis materials, and particularly discloses a cobalt-sulfur compound/nitrogen-sulfur-doped carbon composite catalyst and a preparation method thereof.According to the invention, cobalt salt, thiourea and an organic carbon source are used as main raw materials, and heat treatment is carried out in an inert atmosphere by adopting a one-step solid-phase reaction method to obtain the cobalt-sulfur compound/nitrogen-sulfur-doped carbon catalyst material; the obtained cobalt-sulfur compound/nitrogen-sulfur-doped carbon composite catalyst material isstable in structure and high in electrical conductivity, and can show excellent catalytic performance and high stability; and the preparation method is simple, mild in the reaction conditions and environment-friendly, and the composition of the product is controllable, so that the method is suitable for popularization and application.

The invention relates to the technical field of fireproof paint, in particular to a flexible solvent-free epoxy fireproof paint and a preparation method thereof. The flexible solvent-free epoxy fireproof paint provided by the invention comprises a component A and a component B, wherein the component A is composed of the following components by weight: 20-25 parts of epoxy resin, 5-10 parts of modified resin, 5-10 parts of a flame retardant, 15-25 parts of a carbon-forming catalyst, 10-15 parts of a foaming agent A, 8-15 parts of a pigment A, 10-15 parts of refractory filler A, 2-4 parts of anassistant A and 2-5 parts of refractory fiber A, wherein the epoxy resin is bisphenol A type liquid epoxy resin; and the component B is composed of the following components by weight: 50-60 parts of acuring agent, 2-4 parts of a curing agent accelerant, 10-15 parts of a foaming agent B, 10-15 parts of refractory filler B, 10-15 parts of a pigment B, 3-4 parts of an assistant B and 2-5 parts of refractory fiber B.

A cell catalyst composition according to the present invention includes a carbon catalyst granule and a binder resin, and at least a part of the binder resin includes a resin (B) including a hydrophilic functional group. The carbon catalyst granule is (i) a carbon catalyst granule wherein carbon catalyst (A) particles are bound to each other by using at least the resin (B), or/and (ii) a carbon catalyst granule wherein carbon catalyst (A) particles form a sintered body and are thereby bound to each other. The carbon catalyst (A) includes a carbon element, a nitrogen element, and a base metal element as constituent elements. Further, an average particle diameter of the carbon catalyst granule is 0.5 to 100 μm, and a sphericity of the carbon catalyst granule is equal to or greater than 0.5.

The invention discloses a trimetal-based Ni-Co-Zn-N co-doped porous carbon catalyst as well as a preparation method and application thereof. According to the method, nickel nitrate, cobalt nitrate andzinc nitrate are used as transition metal sources and coordinated with 2-methylimidazole to synthesize a nickel-and-cobalt-doped zinc-based zeolite imidazole framework (Ni-Co-ZIF-8) precursor, and then the trimetal-based Ni-Co-Zn-N co-doped porous carbon catalyst can be prepared through pyrolysis. The method is simple in technological process, rich in raw material source and low in cost, and theprepared catalyst shows oxygen reduction reaction activity comparable to commercial Pt/C and better electrochemical stability and methanol resistance, and has a good application prospect in cathode oxygen reduction reaction of fuel cells and metal-air cells.

The invention discloses a waterborne epoxy fireproof coating as well as a preparation method and application thereof. The waterborne epoxy fireproof coating is composed of a component A and a component B. The component A comprises a waterborne epoxy emulsion, a vinyl-epoxy emulsion, a carbon forming catalyst, a carbon forming agent, a foaming agent and a flame retardant; and the component B comprises a curing agent and refractory fibers. The water-based epoxy fireproof coating disclosed by the invention has the same excellent sealing performance as a solvent-free epoxy fireproof coating and a high-solid-content epoxy fireproof coating, has excellent corrosion resistance, UV irradiation resistance, water resistance and organic solvent resistance, and can be used in a severe outdoor environment. According to the fireproof coating, self-made emulsions are preferably selected, the structure of a film forming matter is optimized and adjusted, and fireproof efficiency is high. Meanwhile, water is selected as a diluent, so coating problems of an original epoxy fireproof coating are fundamentally solved, a water-based system is more environmentally friendly, and the coating belongs to a new-generation fireproof coating technology.

The invention provides a double-effect micro electrolysis combined reactor which comprises a cylinder body and special iron carbon catalytic packing. The center of the cylinder is provided with a channel baffle, the channel baffle is a cylindrical baffle provided with sieve holes, and the special iron carbon catalytic packing is arranged in a packing area formed between the channel baffle and the cylinder body in a filled mode; the channel baffle is internally provided with a circulating pipe, and the circulating pipe is connected with the upper end of the cylinder body through a pump; the bottom of the packing area is provided with a microporous aeration plate, and the microporous aeration plate is connected with an aeration generator; the bottom end of the cylinder body is provided with a water inlet, and the top of the cylinder body is provided with a water outlet; the water inlet is higher than the bottom of the packing area, and the water outlet is higher than the whole circulating pipe. By means of the oxidation and reduction double-effect micro electrolysis combined reactor, an oxidation and reduction integrated reaction can be achieved.

The invention discloses a production method and application of a doped carbon catalyst used for electrocatalytic reduction of CO2. The carbon-based catalyst is doped with iron and nitrogen atoms, andcontains intrinsic carbon defects. Production of the doped carbon-based catalyst used for electrocatalytic reduction of the CO2 comprises the following steps: (1) dissolving an iron salt and urea in deionized water under stirring; (2) adding aniline into a metal salt solution, and conducting stirring for 1 h; (3) adding ammonium persulfate, and then conducting stirring for 0.5 h; (4) transferringan obtained mixed solution into a hydrothermal reactor, and carrying out a reaction; (5) conducting centrifugation on obtained suspension, cleaning the suspension subjected to centrifugation until thesuspension is neutral, and conducting drying to obtain a FeOOH/PANI precursor; and (6) calcining the obtained precursor in an inert gas atmosphere, then conducting acid pickling, and conducting calcining again to obtain the carbon-based catalyst. The production method is low in cost, simple and easy to control, and the catalyst is high in selectivity and good in catalytic activity in an electrocatalytic reduction process of the CO2.

The invention provides a metal-nitrogen-carbon catalyst for carbon dioxide electroreduction. The metal-nitrogen-carbon catalyst comprises a carrier and an active component. Metal-nitrogen-carbon unitpoints are loaded on the surface of carbon-based nanocages, and the dispersity and the loading capacity of the unit points are greatly improved by utilizing the three-dimensional hierarchical structure and the high specific surface area of the nanocages. The nickel-nitrogen-carbon single-site catalyst is used for carbon dioxide electroreduction, and the Faraday efficiency of a carbon monoxide product reaches 87-94% at a wide voltage window of -0.6 V to -1.0 V; through sulfur doping, the specific current density of carbon monoxide is increased from 22.3 Ag<-1> to 37.5 Ag<-1>, and the Faraday efficiency of carbon monoxide reaches 90-95% in the same voltage window.

The invention relates to the field of materials and particularly relates to platinum-cobalt alloy catalyst and a preparation method thereof. The preparation method comprises steps of uniformly mixingcobalt salt, platinum-carbon catalyst and volatile solvent, reducing the temperature to -70 DEG C to -20 DEG C within 2 hours for pre-freezing, and then performing vacuum freeze-drying within the range of -50 DEG C to 80 DEG C to obtain a platinum-cobalt precursor; reducing the platinum-cobalt precursor for 1-6 h at the low temperature of 200-400 DEG C and under the reducing atmosphere, and then performing high-temperature heat treatment for 1-3 h at the temperature of 500-900 DEG C and under the reducing atmosphere. The method is advantaged in that the size of platinum particles in the platinum-cobalt alloy catalyst can be well controlled, so the platinum-cobalt alloy particles are uniformly settled on an outer surface of a carbon carrier; when the obtained platinum-cobalt alloy catalystis utilized for a film electrode, the high power density of the film electrode can be realized, the use amount of platinum in the film electrode is greatly reduced, and cost of the film electrode is effectively reduced.

The invention discloses a silicon-doped iron-nitrogen/carbon composite catalyst as well as a preparation method and application thereof. Mesoporous silicon dioxide spheres are adopted as a template, different types of iron precursors and pyrrole are adopted as raw materials, gas-phase polymerization is performed in pyrrole steam to obtain a Fe/mSiO2@PPY composite material, and then high-temperature roasting hydrofluoric acid treatment is performed to obtain Si-doped iron nitrogen/carbon (Si-FeNx/C). According to the invention, Si-doped iron nitrogen/carbon is used as a cathode material of thefuel cell, and the oxygen reduction catalyst with excellent performance is constructed. The Si-doped iron-nitrogen/carbon catalyst prepared by the method has catalytic activity superior to that of commercial Pt/C under an alkaline condition and has the advantages of high stability and tolerance to methanol.

The invention discloses a nano carbon-loaded cobalt-nitrogen-carbon catalytic material as well as a preparation method and application thereof, and belongs to the technical field of propane dehydrogenation reaction catalysts. The compounding of nano carbon and cobalt-nitrogen-carbon is completed by the processes of complexing a cobalt salt precursor and a phenanthroline ligand, in-situ dipping thecobalt salt precursor and the phenanthroline ligand on the nano carbon surface, calcining, and pickling. The composite material can solve the problems of low catalytic performance of nano carbon andlow utilization efficiency and poor stability of an active cobalt-nitrogen-carbon component. The catalytic material is used as a catalyst for propane dehydrogenation reaction, propane is catalyzed tobe directly dehydrogenated to generate propylene under the conditions of no water, no oxygen and normal pressure, and the use temperature of the catalyst is 400-600 DEG C. The catalyst is stable in performance, and is high in catalytic activity and high in propylene selectivity in direct dehydrogenation reaction, carbon deposition is not prone to happening in the reaction process, the preparationmethod is simple and convenient, and raw materials are easy to obtain.

The invention relates to a method for carrying out a gas-solid circulation fluidized bed reaction. The method comprises the following steps: (1) in a fluidized bed reactor, an exothermic reaction is carried out under a condition that a gaseous raw material contacts a solid catalyst, such that a mixed product comprising a gaseous product and the solid catalyst is produced; (2) gas-solid separation is carried out in the upper part of the reactor; a part of the catalyst with charcoal deposit is delivered to a catalyst regenerator; (3) in the catalyst regenerator, the catalyst with charcoal deposit contacts regeneration air, such that a charcoal burning reaction is carried out; catalyst activity is recovered, and flue gas is generated; (4) the regenerated catalyst is delivered to the fluidized bed reactor through a regenerated catalyst delivery pipe; (5) the absolute value of the difference between the temperature of steam used for delivery and stripping and the temperature of the solid catalyst in a regenerated catalyst stripping section is 0-100 DEG C; and the absolute value of the difference between the temperature of delivery air used for delivering and the temperature of the solid catalyst in a spent catalyst stripping section is 0-100 DEG C. With the method, catalyst powdering damage caused by thermal expansion and contraction is effectively reduced.

Belonging to the technical field of photocatalysis, the invention discloses a reducing carbon nitride photocatalyst, a preparation method and application thereof. The photocatalyst is prepared by thesteps of: heating melamine to 520-550DEG C, performing roasting, and conducting grinding to obtain g-C3N4 powder; mixing NaBH4 with g-C3N4 powder, and then performing heating to 570-600DEG C in a protective atmosphere; and performing cooling, then cleaning the product with deionized water and ethanol, and conducting drying. The reducing carbon nitride catalyst does not contain metal, and has the advantages of environmental protection, stability, low cost and the like. According to the invention, reducing carbon nitride is applied to photocatalytic degradation of diclofenac sodium for the firsttime, also shows excellent photocatalytic performance, and has good stability.

Isoquinolinone compounds have a general structural formula as shown in the specification, wherein R<1> and R<2> are aliphatic substituent groups or aromatic substituent groups and can be identical or not, R<3> is aliphatic substituent group or aromatic substituent group, and R<4> can be aliphatic substituent group, aromatic substituent group, aliphatic substituent group containing ester group or aliphatic substituent group containing oxygen or halogen heteroatom carbon. According to the preparation method of the isoquinolinone compounds, benzamide and alkyne are subjected to catalytic cyclization in the presence of palladium/carbon to form corresponding isoquinolinone compounds. The preparation method is simple in process, uses cheap and easily available raw materials, is high in yield, and does not need inert gas shielding; in addition, the reaction temperature is mild relatively and the palladium/carbon catalyst can be recycled.

The invention discloses a nitrogen-doped porous carbon non-metal catalyst and a preparation method thereof, and application of the nitrogen-doped porous carbon non-metal catalyst in oxidation-reduction reaction, and belongs to the technical field of energy and nano material preparation. According to the method, the non-metal nitrogen-doped porous carbon catalyst is prepared by combining hydrothermal polymerization with a high-temperature carbonization doping process. The non-metal nitrogen-doped porous carbon catalytic material shows oxygen reduction reaction electrocatalytic activity similarto that of a commercial platinum-carbon catalyst in an alkaline electrolyte, and is superior to the commercial platinum-carbon catalyst in stability and methanol resistance. The nitrogen-doped porouscarbon non-metal catalyst and the preparation method thereof, and the application of the nitrogen-doped porous carbon non-metal catalyst in oxidation-reduction reaction have the advantages of the simple technique and wide raw material sources, and are expected to implement high-efficiency and low-cost large-scale production. The oxygen reduction reaction electrocatalyst can be applied to the fields of alkaline fuel cells, metal-air battery cathode materials and the like.

The invention belongs to the technical field of sewage treatment technologies and environment-friendly functional materials, and particularly relates to a preparation method and application of a cobalt-based bimetallic sulfur/carbon (CoMS/C) catalyst derived from metal organic frameworks (MOFs). According to the cobalt-based bimetallic sulfur/carbon catalyst, zeolite imidazate skeleton-67 (ZIF-67) is used as a precursor to derive a layered bimetallic hydroxide with a three-dimensional configuration so as to realize doping of a second metal ion, and a novel Fenton-like catalyst with a carbon substrate is prepared through a one-step vulcanization and carbonization method. The catalyst is of a hollow three-dimensional structure, the surface of the catalyst is provided with uniformly dispersed active sites, an activated persulfate system can generate strong-oxidizing harmless reactive oxygen species such as sulfate free radicals and hydroxyl free radicals, vulcanization and carbonization reduce ion dissolution and effectively increase electron transfer efficiency, and thus the capability of catalytically degrading organic pollutants is improved. When the catalyst is applied to high-concentration ofloxacin wastewater, the degradation rate is obviously improved, and the catalyst has a good application prospect.

The invention provides a carbon-supported noble metal alloy catalyst as well as a preparation method and application thereof, and the method comprises the following steps: 1) preparing an aqueous solution of sugar and template salt, adjusting the pH value, and carrying out hydrothermal carbonization reaction; 2) drying the hydrothermal carbonization product; 3) carrying out primary heat treatmentin a mixed gas atmosphere of inert gas and hydrogen to obtain carbon-loaded transition metal; 4) dispersing the obtained carbon-loaded transition metal in water to form a carbon-loaded transition metal aqueous solution, adding a noble metal precursor solution and a reducing agent, reacting and drying; and 5) carrying out secondary heat treatment on the obtained dried product in an inert gas atmosphere to obtain the carbon-supported noble metal alloy catalyst. The obtained catalyst has high catalytic activity and good durability, the initial potential and half-wave potential of an LSV curve ofthe catalyst are superior to those of a commercial platinum-carbon catalyst, the durability of the catalyst is superior to that of the commercial catalyst after 3000 times of circulation, and the catalyst has good oxygen reduction catalytic performance.

The invention provides an ultra-thin fireproof coating for a steel structure. The fireproof coating comprises a component A and a component B. The component A comprises the following materials in parts by weight: 30-58 parts of organosilicon epoxy hybrid resin; 4-8 parts of liquid petroleum resin; 5-10 parts of a flame retardant; 5-10 parts of a carbon forming agent; 5-10 parts of a carbon formingcatalyst; 5-10 parts of a foaming agent; 3.0-6.0 parts of an active diluent; 6-10 parts of a filler; 5-10 parts of an antirust agent; 0.8-3.5 parts of an auxiliary agent; and 2-5 parts of refractoryfibers. The component B comprises triethoxyaminosilane and polyoxypropylene diamine in a weight ratio of (2-5): 1. Compared with a traditional epoxy fireproof coating, the fireproof coating disclosedby the invention is more suitable for steel structure coating construction needing both fire prevention and corrosion prevention, has excellent adhesive force, cracking resistance and weather resistance, and does not crack or fall off in a high-low temperature alternating environment.