861 results about "Nano catalyst" patented technology

A non-vacuum-based, non-collodial chemistry-based method of synthesizing metal nanoparticles and nanoparticle-nanostructured material composites obtained by that method. An embodiment of the method of this invention for fabricating a nanoparticle-nanostructured material composite and synthesizing nanoparticles includes preparing a nanostructured/nanotextured material, and, contacting the nanostructured/nanotextured material with a solution. Nanoparticles are synthesized on the nanostructured/nanotextured material as a result of the contact. The method of the present invention can be utilized to fabricate SPR and SERS substrates for sensing and detection. Additional systems based on this approach (e.g., surface plasmon resonance absorption and alloying sensors and nanocatalysts) are described.

Disclosed are a nanocrater catalyst in metal nanoparticles with a nanocrater form of hole structure in center of the catalyst which is useful for manufacturing nano-sized materials and/or articles with desired structure and characteristics, a preparation method thereof including a plasma etching and chemical etching process (“PTCE process”), and nano-sized materials and/or articles manufactured by using the nanocrater catalyst in metal nanoparticles.

A PtNi alloy/graphene combined nanometer catalyst with a hollow structure adopts the graphene as a carrier and loads the PtNi alloy nanometer particles of which the grain diameter is 10-50 nm on the surface of the graphene, wherein the PtNi alloy nanometer particles are hollow spherical structures. The method for preparing the combined catalyst comprises the following steps: dispersing the graphene oxide in water liquor to which surfactant is added through ultrasound; uniformly mixing with soluble nickel salt (II); adding the reducing agent in inert gas atmosphere; adding soluble platinum salt (IV); stirring at 0-50 DEG C to execute the reduction reaction; centrifuging, washing and drying the reaction product to obtain the PtNi alloy/graphene combined nanometer catalyst with the hollow structure. The PtNi alloy/graphene combined nanometer catalyst with the hollow structure in the invention has good electro-catalytic property on electrochemical oxidation of methyl alcohol, and can be widely applied in methyl alcohol fuel cells.

Embodiments of the invention provide methods for recovering petroleum products from a formation by distributing nanocatalysts into the formation and heating the heavy crude oil therein. In one embodiment, a method is provided which includes flowing a catalytic material containing the nanocatalyst into the formation containing the heavy crude oil, exposing the heavy crude oil and the catalytic material to a reducing agent (e.g., H₂), positioning a steam generator within the formation, generating and releasing steam from the steam generator to heat the heavy crude oil containing the catalytic material, forming lighter oil products within the formation, and extracting the lighter oil products from the formation. In another embodiment, a method is provided which includes exposing the heavy crude oil and the catalytic material to an oxidizing agent (e.g., O₂). The nanocatalyst may contain cobalt, iron, nickel, molybdenum, chromium, tungsten, titanium, oxides thereof, alloys thereof, derivatives thereof, or combinations thereof.

The invention relates to a method for preparing a carbon supported Au-Pt or Au-Pd catalyst by modifying Au-Pt or Au-Pd bimetal nanoparticles with microwaves, belonging to the technical field of catalytic materials. High pressure and high temperature generated by microwaves in a high-pressure reaction tank are utilized to treat an Au-Pt or Au-Pd composite nano colloid synthesized by a chemical coreduction method so as to induce the modification of the Au-Pt or Au-Pd bimetal nanoparticles; and the microwave-modified bimetal nanoparticles are deposited on the surface of the carbon support, thereby obtaining the carbon supported Au-Pt or Au-Pd catalyst with high activity. The carbon supported Au-Pt or Au-Pd catalyst has high electrocatalytic activity; the supporting rate of the Au-Pt or Au-Pd bimetal is high; the supporting amount of the Au-Pt or Au-Pd is controllable; and the method can be used for preparing the carbon supported Au-Pt or Au-Pd nano catalyst of which the mass ratio of Au-Pt or Au-Pd to carbon is 1-20%. The method provided by the invention has the advantages of low cost, simple technique and low facility request, and has wide industrial application prospects.

The invention relates to the field of thermal interface materials, and more particularly, provides a thermal grease composition, which contains the following components: (A) 100.0 parts by weight of thermally conductive filler, (B) 0.1 to 8.0 parts by weight of active solid silicone resin, (C) 0.1 to 15.0 parts by weight of active silicone oil, (D) 0.1 to 9.0 parts by weight of macromolecular polysiloxane, (E) 0.1 to 3.0 parts by weight of nano catalyst, and (F) 0.1 to 3.0 parts by weight of additive. The thermal grease composition provided by the invention has good thermal conductivity and using weatherability, can effectively solve the technical difficulty that the thermal grease composition in the prior art is pulverized and crushed and the thermal conductivity is therefore reduced as the service time increases. The manufacturing process has simple, convenient and easy steps and the thermal grease composition is suitable for large-scale match production.

The invention belongs to the technical field of treatment and application of nanometer materials and industrial and agricultural wastewater, and provides a magnetic Fe3O4/SiO2/TiO2/quantum dot compounded nanometer photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps of: synthesizing an Fe3O4 magnetic nucleus by a coprecipitation method; preparing an SiO2 protective layer by virtue of hydrolysis reaction and polycondensation reaction of TEOS (Tetraethyl Orthosilicate); then preparing a TiO2 layer on the surface of the SiO2 protective layer by a sol-gel method; and finally modifying Fe3O4/SiO2/TiO2 nanoparticles by CdS and CdSe quantum dots. The obtained magnetic Fe3O4/SiO2/TiO2/quantum dot compounded nanometer photocatalyst has very good visible-light photocatalytic capability, can be conveniently and fast recovered and reused by an external magnetic field, and can be used for removing organic pollutants of azo dyes contained in the industrial wastewater.

This invention discloses a method for preparing 4, 4'-diamino dicyclohexylmethane (H12MDA) from 4, 4'-diamino diphenylmethane (MDA) via hydrogenation catalyzed by supported nanoscale Ru catalyst. The method comprises: performing stereoselective hydrogenation on MDA at 100-180 deg.C and 4-10 MPa in an intermittent autoclave for 1-9 h to obtain H12MDA. The MDA conversion rate is near 100%, the H12MDA weight yield is near 100%, and the trans-H12MDA content is below 25%. After the supported nanoscale Ru catalyst is continuously reused for above 30 times without supplementation, the MDA conversion rate is still near 100%, and the trans-H12MDA content is below 27%.

The invention discloses a method for preparing a nanometer photocatalyst material supported embedded composite film. The method comprises the following steps: dissolving an organic polymer base film material, a pore-forming agent and a nanometer catalyst in a solvent, stirring and standing to prepare a casting film solution; dispersing the nanometer photocatalyst in the solvent to obtain dispersion liquid, spreading the dispersion liquid on a plate to prepare a spreading solution, and drying the spreading solution to obtain a spreading film; and covering the spreading film with the casting film solution, scraping a liquid film by utilizing a film scraper, immersing the scraped liquid film in a constant temperature gel bath, and curing the liquid film to prepare the nanometer photocatalyst material supported embedded composite film. The invention also provides the nanometer photocatalyst material supported embedded composite film and application thereof. According to the method, a nanometer photocatalyst coating is uniformly, effectively, stably and firmly supported on the surface of the embedded composite film. Moreover, according to the composite film, the removal rate of pollutants is effectively improved, and film pollution is reduced.

The invention discloses a method for utilizing a heterogeneous catalyst to efficiently activate persulfate so as to treat organic wastewater, belonging to the technical field of water pollution control. According to the method, nano Fe0, nano FeOxHy (y=2x-3 or 3y=6x-8) and FeOxHy@Fe0 (FeOxHy@Fe0, y=2x-3 or 3y=6x-8) nano composite materials are used as a heterogeneous catalyst, so that persulfate is activated to produce sulfate free radicals having strong oxidizing property, thereby removing nondegradable organic substances in wastewater. Besides, due to the characteristics of high specific area, high catalytic activity and the like, the solid-phase nano catalyst can efficiently and persistently activate the persulfate to be subjected to heterogeneous activation. The method is applicable to treatment of various organic wastewater, has the advantages of high efficiency, favorable persistence, convenient operation process and environment friendliness, and can efficiently remove toxic and harmful pollutants in the wastewater in a wider pH value range, thus providing broad prospects for treatment of toxic, harmful and nonbiodegradable organic wastewater.

A functionalized graphene supported nickel palladium bi-metal nanometer catalyst, and preparation and applications of the catalyst are provided. A preparation method does not include a high-temperature hydrothermal reaction or a step of adding other catalysts, and only includes adding nickel chloride (NiCl2) and sodium tetrachloropalladate (Na2PdCl4) which are metal precursors into a mixed solution of 3-aminopropyl-3-ethoxysilane (APTS) and graphite oxide (GO), rapidly reducing Ni<2+> and Pd<2+> ions into NiPd metal particles by utilizing sodium borohydride (NaBH4) and allowing the metal particles to grow on a -NH2-functionalized graphene substrate (NiPd/N-FG). The prepared nickel palladium metal nanometer particles are uniformly distributed on the substrate and have a very small particle size (1.2-2.4 nm). The synthesized Ni<0.4>Pd<0.6>/N-FG catalyst still has extremely good catalytic performance when the content of the non-noble metal Ni accounts for 40% of the total metal content. The method is simple, effective and low in cost, overcomes problems such as long synthesis time, high synthesis temperatures, and high nanometer particle sizes, and promotes practical application of formic acid as a hydrogen storage material in fuel cells and vehicle-mounted mobile hydrogen source materials.

A preparation method of polyaniline/graphene controllable load platinum nanoparticles comprises the following steps of: (1) preparing reduced grapheme; (2) synthesizing a polyaniline/reduced grapheme (PANI/rGNS) nanocomposite by a liquid-liquid interfacial method; (3) preparing a platinum loaded polyaniline/graphene (Pt/PANI/rGNS) nanocatalyst. The invention has the following advantages: by the adoption of the liquid-liquid interfacial polymerization method, the uniformly dispersed PANI/rGNS nanocomposite is synthesized, thus effectively preventing the agglomeration of the composite material,making for uniformly and controllably loading PtNPs on the surface of PANI/rGNS, solving the technical difficulty of metal particle agglomeration and realizing uniform and efficient loading of PtNPs;an electrochemical test result shows that the catalyst has excellent electrocatalytic activity for methanol oxidation and oxygen reduction and ultrasensitive detection of hydrogen peroxide (H2O2) andglucose can be also realized.

The invention relates to a noble metal nanocatalyst loaded on a dendritic macromolecule functionalized graphene and a preparation method thereof. The nanocatalyst is composed of graphene, silane coupling agents, dendritic macromolecules and noble metal nanoclusters, wherein the dendritic macromolecules are amino-terminated polyamide-amine (PAMAM) dendritic macromolecules, and the noble metal nanoclusters comprise palladium, platinum, gold, silver, ruthenium, iridium, osmium and related alloys. Aminos are introduced onto the surfaces of exfoliated graphene by the silane coupling agents, then different generations of the dendritic macromolecules are covalently introduced, and further the nanoclusters of noble metals and the related alloys are loaded by using the above-obtained materials as templates. The loaded noble metal nanocatalyst is not easy to agglomerate or to fall off during catalytic processes, and has high catalytic activity. The loaded noble metal nanoclusters has the characteristics of tunable size and controllable shape, and the structure and composition of the noble metal alloys can be controlled accurately. The method is simple in process and short in period, and can easily realize industrial production.

The present invention provides a metal nano catalyst, a method for preparing the same and a method for controlling the growth types of carbon nanotubes using the same. The metal nano catalyst can be prepared by burning an aqueous metal catalyst derivative comprising Co, Fe, Ni or a combination thereof in the presence of a supporting body precursor.

A nanocatalyst for adsorbing and deactivating virus (influenza virus, adenovirus, etc) is composed of the carrier chosen from natural zeolite, synthetic molecular sieve, porous silica gel, aluminium oxide and titanium oxide, and the active component chosen from the nanoparticles of Ag, Cu, Zn, Au and Pt. Its advantage is high effect.

The invention discloses a preparation method of nitrogen-doped hierarchical pore carbon. The preparation method includes: using biomass as a raw material, and mixing the biomass with a composite activator; heating for calcining, mixing a calcining product with deionized water, standing for precipitation, and filtering to obtain precipitate; performing after-treatment to obtain the nitrogen-doped hierarchical pore carbon, wherein the composite activator is sodium hydrogen carbonate/nitrogen-containing compound, a mass ratio of sodium hydrogen carbonate to the nitrogen-containing compound is 0.25-4:1, the nitrogen-containing compound comprises at least one of ammonium oxalate, ammonium hydrogen carbonate, ammonium chloride and ammonium nitrate, and a mass ratio of the biomass to the composite activator is 1:2-16. The composite activator is utilized to activate the biomass to obtain a functionalized nitrogen-doped hierarchical pore carbon material, the preparation method is simple and easy to operate, the biomass existing in nature can be utilized directly, the obtained carbon material has rich hierarchical pore structure and can be used as a catalyst carrier to prepare high-performance nano catalysts, and utilization value of the biomass is increased greatly.

Novel catalysts comprised of graphitic nanostructures. The graphitic nanostructure catalysts are suitable for catalyzing reactions such as oxidation, hydrogenation, oxidative-hydrogenation, and dehydrogenation.

The invention provides a preparation method of catalyst for the cathode of a direct methanol fuel cell, comprising the following steps: adding solvent into a reactor; adding with nitrogen; adding withM-salt and stabilizing agent in proportion; dropwise adding with reducing agent; reacting to prepare M nanometer catalyst solution; vacuuming and filtering to obtain M nanometer particles; dissolvingthe M nanometer particles into the solvent and stirring; adding with platinum base compound and stabilizing agent; ultrasonically stirring; adding with hydrazine hydrate solution and reacting; preparing black nanometer catalyst solution; separating and washing; and vacuum drying to obtain black powdered M-Pt core-shell structure nanometer particles catalyst. By using the characteristics that thenoble metal has higher catalytic activity to oxygen reduction and the transition metal has a special electronic structure, the method uses the transition metal with more d belt electron holes and lower electron negativity as core to prepare M-noble metal core shell structure nanometer particles which are used for oxygen electrode reduction catalyst of the direct methanol fuel cell, wherein the catalyst has higher oxygen reduction activity, methyl alcohol resistibility and stability, and the preparation method is simple and is low in cost.

The invention relates to a preparation method of the membrane electrode of a direct methanol fuel cell. The method comprises the following steps: an electrostatic spinning technology is adopted to construct a nano-fiber network structure thin membrane mixed by active carbon powder and Nafion resin; a precious metal nano-catalyst is deposited on the surface of the manufactured nano-fiber network structure thin membrane, so that a cathode catalyst layer thin membrane and an anode catalyst layer thin membrane are manufactured respectively; or the mixture of the precious metal nano-catalyst and the Nafion resin is taken as raw materials to directly construct the cathode catalyst layer thin membrane and the anode catalyst layer thin membrane through the electrostatic spinning technology; a cathode gas diffusion layer, the anode catalyst layer thin membrane, a Nafion membrane, the cathode catalyst layer thin membrane and a cathode gas diffusion layer are hot-pressed finally, so that the aggregation of the membrane electrode of the direct methanol fuel cell is manufactured; the membrane electrode with a nano-fiber three-dimensional network structure is constructed through the electrostatic spinning technology, so that the maximization of the three-phase reaction interface of the membrane electrode is achieved, and the improvement of electrocatalytic activity, mass-transfer efficiency and utilization efficiency of the catalyst is achieved.

The invention discloses a Pd/TiO2/C composite nano-catalyst and a preparation method thereof. The Pd/TiO2/C composite nano-catalyst consists of nano-Pd, nano-TiO2 and active carbon powder, wherein the mass ratio of the nano-Pd to the nano-TiO2 to the active carbon powder is preferably 1:2:2. The preparation method comprises the steps of preparing nano-TiO2 powder by a hydrothermal synthesis method, preparing a mixed solution of a carrier consisting of active carbon and TiO2, loading Pd nanoparticles on the carrier consisting of the active carbon and the TiO2 by a liquid phase reducing method and the like. The nano-TiO2 with high stability in acid and alkaline solution and the treated active carbon form the composite carrier, so compared with the traditional carrier only comprising the active carbon, the Pd/TiO2/C composite nano-catalyst has higher catalytic activity on ethanol and stability.

The invention relates to a preparation method of three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres, and relates to the technical field of multi-level structured nano-grade catalyst materials. First, nickel nitrate hexahydrate and cobalt nitrate hexahydrate are adopted as a nickel source and a cobalt source, a deionized water-isopropanol mixed phase with a proper proportion is adopted as a solvent, methanol is adopted as a reactant, and no additional base precipitating agent is adopted; a three-dimensional flower-shaped nano-sheet microsphere precursor is prepared in a Ni<2+>-Co<2+>-NH3-NH4<+>-SG<n->-H2O-IPA-CH3OH system (SG<n-> is CO3<2-> or HCOO<->); the temperature is increased to 300-400 DEG C in an air atmosphere with a speed of 1 DEG C/min, and the precursor is calcined for 2-3h, such that the three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres are obtained. According to the invention, co-precipitation of the formulated cobalt and nickel in the raw materials is realized. The prepared three-dimensional flower-shaped nickel cobaltate nano-sheet mesoporous microspheres are spinel cubic phases with high purity, and are formed by ultrathin nano-sheet self-assembly. The microspheres comprise rich mesopores, and have a large specific surface area. The method has the advantages of simple operation, appropriate conditions and easy control.

The invention provides a preparation method of a ceria-loaded highly dispersed nano-catalyst. The preparation method comprises S1) heating cerium oxide and reducing gas for a reaction, and then cooling the reaction product to the room temperature in inert gas to obtain reduced ceria, and S2) mixing a metal salt precursor solution and the reduced ceria under anaerobic conditions, standing the mixture, drying the mixture and carrying out calcining to obtain the ceria-loaded highly dispersed nano-catalyst. Compared with the prior art, the preparation method uses the reducing gas to reduce the ceria so that the surface oxygen vacancy is produced and is protected in an oxygen-free environment, and then prepare the ceria-loaded highly dispersed nano-catalyst under strong interaction of metal ions and oxygen vacancy. Through controlling the degree of reduction of the carrier ceria, the ceria-loaded highly dispersed nano-catalyst is obtained and catalytic performances are improved. The preparation method has the advantages of simple processes, good repeatability, low cost and good application prospect.

The invention provides a method for preparing a core-shell ferroferric oxide/graphene oxide composite nano-catalyst. The method comprises the following steps of preparing nanometer ferroferric oxide by utilization of a hydrothermal method, preparing graphene oxide by utilization of a modified Hummers method, preparing the core-shell ferroferric oxide/graphene oxide composite nano-catalyst by utilization of an electrostatic self-assembly method. The catalyst prepared according to the method provided by the invention has the advantages that the adsorptive property is excellent, the stability is good, the catalyst can be cyclically utilized, and an excellent adsorption effect can be achieved during the process of degrading simulated dye rhodamine B.

A homogeneously-structured catalyst/enzyme composite structure formed by electrophoresis deposition (EPD) method. Catalyst and enzyme are simultaneously deposited onto the electrode surface by the EPD method, so as to form a film of catalyst/enzyme composite thereon. The film of catalyst/enzyme composite includes enzyme for catalyzing the biochemical reaction, and catalyst for increasing the rate of the electrochemical reaction, which are homogeneously mixed and forms a stable and three-dimensional structure. Also, this homogeneously-structured catalyst/enzyme composite is applicable as a working electrode of the bioreceptor in a mini-biosensor.

The invention discloses a method for preparing a Pd-based nano-catalyst used for alcohol fuel cells directly, which is characterized in that the following steps are included sequentially: A. carbon carrier or carbon carrier and stabilizing agent are added into polylol and are dispersed evenly to acquire serum containing carbon; B. precursor and the precursor with metallic additions are added into the serum containing carbon which is evenly dispersed; C. the serum acquired is carried out oil bath and reduction for 2-10 hours at the temperature of 125-198 DEG C; D. the serum is cooled to the room temperature and then filtrated, repeatedly washed with ultrapure water and placed in a backing oven for vacuum drying, thus acquiring the Pd-based catalyst. The method of the invention prepares the Pd-based nano-catalyst by reducing by glycol directly or by thermal treatment after reducing by the glycol, which is a preparation technology with simple preparation process, convenient operation, short procedure, high recovery rate and environment-friendly property.

The invention relates to a magnetic nano Cu-Fe3O4/grapheme composite catalyst and application of the composite catalyst in reduction of nitro-compounds. The preparation method comprises the steps of (1) placing graphite oxide into a water soluble alcohol for ultrasonic dispersion; (2) dissolving ferrous salts in water in an ultrasonic mode, then dropwise adding into a solution of Step (1), and mixing uniformly; and (3) dissolving copper salts in water in an ultrasonic mode, adding a sodium hydroxide solution to adjust the pH to be in a range of 10-11, conducting suction filtration and washing to obtain solid products, placing in the water soluble alcohol for ultrasonic dispersion, dripping into a mixing solution of Step (2), mixing uniformly, dropwise adding the sodium hydroxide solution to adjust the pH to be in a range of 10-11, mixing uniformly, and then transferring a mixture system into a hydrothermal still for reaction to obtain the magnetic nano Cu-Fe3O4/grapheme composite catalyst. The preparation method is few in step and simple in process, the prepared composite catalyst can be effectively separated in an applied magnetic field, the problem that the nano catalyst is difficult to recover is solved, and simultaneously, the catalyst has the high catalytic activity in terms of reduction of nitro-compounds.

The present invention relates to an inorganic intercalation nano catalyst and its preparation method. It is an inorganic intercalation nano catalyst made up by using zinc binary carboxylate as insert and using montmorillonite, mica, vermiculite, moscow earth and kaolin as base body, and its preparation method includes the following steps: activating inorganic base body powder for 2-10 hr. at 600-1000 deg.C, cooling for stand-by; dissolving zinc binary carboxylate in strong polar solvent, then making it and inorganic base body implement intercalation reaction for 30-120 min, then adopting the weak polar solvent to make lattice modification so as to obtain the invented catalyst with good catalytic efficiency and good selectivity.

The invention discloses a bimetal nanometer catalyst used for preparing dimethyl oxalate through CO gas-phase oxidative coupling as well as preparation and an application method of the bimetal nanometer catalyst, and belongs to the technical field of preparation of the dimethyl oxalate. The bimetal nanometer catalyst is characterized in that a catalyst carrier is Alpha-aluminium oxide, an active component is Pd-Cu nanometer grains, the average size of the grain is 2-3nm, the Pd content of the active component is 0.01-2% and Cu content is 0.01-0.04% according to the mass of the catalyst carrier. The catalyst is prepared through a room temperature normal position load method, the preparation method is simple, the energy dissipation is low, the catalyst is suitable for industrial production, the active component Pd-Cu nanometer grains in the catalyst has high dispersity, large specific surface area, small size and uniformity in distribution; the catalyst provided by the invention adopts the Pd-Cu bimetal nanometer grains as the active component, and a bimetal component synergistic effect and a nanometer effect are utilized to reduce the content of the noble metal PD to 0.1% under the premise of keeping the high activity and stability of the catalyst, therefore and the cost of the catalyst is greatly reduced, and the partial substitution of the noble metal is realized.

The invention discloses alloy nanoparticles, a preparation method and applications thereof. According to the method, a metal precursor loaded on a substrate is rapidly reduced at a high temperature, wherein the metal is rapidly nucleated to avoid the generation of the split-phase alloy so as to form the alloy nanoparticles with ultra-small particle size; and by controlling the types of the metal salts in the precursor, the components in the alloy nanoparticles can be effectively regulated. According to the present invention, the FeCoPtPdIr@GO (FeCoPtPdIr alloy particles are loaded on the surface of graphene oxide) prepared in the embodiments of the invention shows excellent electrochemical hydrolysis hydrogen production performance, can stably operate for 150 h under a condition of 10 mA.cm<-2>, has excellent electrochemical stability, and has the Faraday efficiency of 99.4%, wherein the eta 10 of the product of the present invention is equal to 42 mV, and far exceeds the eta 10 of thecommercial Pt/C of 64 mV (the smaller the eta 10, the better the electrochemical hydrolysis hydrogen production performance); and the new thought is provided in the preparation of alloy nanoparticlesand alloy nanometer catalysts, and the development of alloy nanometer catalysts in catalysis and energy is promoted.

A combinative carbon material is presented. A large-sized carbon material serving as a support combines with a nano-sized fibrous carbon material, which grows on the support. In addition to the support, a catalyst system includes an active nanocatalyst and an optional co-catalyst. The catalyst system is then reacted with a carbon source at an elevated temperature to form a combinative carbon material.