1788 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.

An organically complexed nanocatalyst composition is applied to or mixed with coal prior to or upon introducing the coal into a coal burner in order to catalyze the removal of coal nitrogen from the coal and its conversion into nitrogen gas prior to combustion of the coal. This leads to reduced NOx production during coal combustion. The nanocatalyst compositions include a nanoparticle catalyst that is made using a dispersing agent. The dispersing agent includes at least one functional group such as a hydroxyl, a carboxyl, a carbonyl, an amine, an amide, a nitrile, a nitrogen having a free lone pair of electrons, an amino acid, a thiol, a sulfonic acid, a sulfonyl halide, and an. acyl halide. The dispersing agent forms stable, dispersed, nano-sized catalyst particles. The catalyst composition can be formed as a stable suspension to facilitate storage, transportation and application of the catalyst nanoparticles to a coal material. The catalyst composition can be applied before or after pulverizing the coal material or it may be injected directly into the coal burner together with pulverized coal.

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 provides an artificial hollow micro-nano motor and a preparation method thereof, relating to artificial motors and preparation methods thereof and solving the problem that the existing solid spherical motor, tubular motor and linear motor are poor in loading performance. The artificial hollow micro-nano motor is made from a polyelectrolyte double-layer skeleton and a catalyst or is made from a cationic polyelectrolyte skeleton and the catalyst; and the preparation method of the artificial hollow micro-nano motor comprises the following steps of: (1) preparing micro-nano catalyst particles; (2) synthesizing a core substrate; (3) synthesizing an artificial hollow micro-nano motor skeleton; and (4) removing the core substrate by using a template solvent so as to obtain the artificial hollow micro-nano motor. The preparation method has the advantages of simplicity and feasibility, stable process, good repeatability and convenience in mass production, and the prepared artificial hollow micro-nano motor is good in transportability and loading function, has a wide application prospect in a plurality of aspects, such as drug release control, blood purification, clinical diagnosis, and is simple in operation. The artificial hollow micro-nano motor prepared by the preparation method provided by the invention is applicable to the medical field.

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.