41 results about "In situ chemical reduction" patented technology

The preparation method of Pt-Ru series CO resistant electrode catalyst is characterized by that it uses carbon nano tube as carrier, utilizes the in-situ chemical reduction homogeneous precipitation method and makes the ions of Pt, Ru and Sn into compounding ion respectively (called complex ion for short), then it uses two kinds of three kinds of complex ions and mixes them together to obtain metastable colloid, them adopts cheap reduction agent formaldehyde (or sodium borohydride or ethyl alcohol or hydrogen gas) to make the metastable colloid be reduced and deposited on the activated carbon nano tube so as to obtain the invented electrode catalyst for proton-exchange membrane fuel cell. It possesses good electric catalytic activity and resistance to Co, and features large specific area, high porosity, good dispersion property and low ptatinum use level.

The present invention relates to a preparation method of Pt / CNT electrode catalyst carried by carbon nano tube. It is characterized by that the carbon nano tube can be used as carrier, a light-catalyzed in-situ chemical reduction precipitation method is utilized, and the ethylalcohol (or formaldehyde) can be used as reduction agent, and the chloroplatinic acid can be reduced and deposited on the activated carbon nano tube so as to obtain the invented Pt / CNTs catalyst with high activity for proton, exchange membrane fuel cell direct methyl alcohol fuel cell. As compared with existent electrode catalyst said invention features large specific surface area, high porosity, good dispersion property and low platinum use level.

Bottles, containers and other articles are formed from polypropylene compositions that include a reheating agent, such as antimony, carbon black, graphite, titanium, copper, manganese, iron, tungsten, graphite, infra-red absorbing dyes or other infra-red absorbing material. The reheating time for the polypropylene composition is shortened for injection stretch blow molding or thermoforming, and the polypropylene granule composition with reheating agent has an L* value of at least 80% of the L* value for a polypropylene granule control without added reheating agents as measured by the Gardner color test. The reheating agent may be incorporated into the polypropylene composition by in situ chemical reduction of a metal compound, such as antimony triglycolate, with a reducing agent, such as hypophosphorous acid. In addition, the polypropylene composition with reheating agent may be derived from a polypropylene masterbatch with high concentrations of reheating agent.

The invention relates to a core-shell-structured silver-based heat-conductive rubber composite material and a preparation method thereof. The composite material comprises a rubber matrix, a vulcanizerand core-shell-structured silver-based heat-conductive filler. The core-shell-structured silver-based heat-conductive filler is prepared through subjecting dopamine to self-polymerization on the surface of high-heat-conductivity inorganic filler so as to form a polydopamine functional layer, putting the heat-conductive filler, of which the surface is coated with a polydopamine layer, into a silver plating solution, adding a reducer glucose solution, and depositing and coating the surface of the high-heat-conductivity inorganic filler with silver nanoparticles by an in-situ chemical reductionmethod. The rubber composite material with high coefficient of thermal conductivity and low dielectric constant is prepared through adding the core-shell-structured silver-based heat-conductive fillerinto the rubber matrix. The composite material is excellent in heat-conducting property and can be applied to electronic packaging materials. The preparation method is simple, convenient, effective and controllable in operation and is economical and environmentally friendly.

The invention discloses a nano zero-valent iron modified porous cobaltosic oxide heterogeneous persulfate catalyst, and a preparation method and an application thereof. The preparation method for synthesizing the porous cobaltosic oxide heterogeneous persulfate catalyst by using a nano zero-valent iron modified yeast template technology comprises the following steps: firstly, synthesizing cobaltosic oxide microspheres with high specific surface area and porosity in a high-temperature environment by using Saccharomyces cerevisiae as a biological template; and loading nano zero-valent iron on the surface by an in-situ chemical reduction technology. The synthesized final catalyst is a heterogeneous iron-cobalt bimetallic composite material, and can effectively catalyze peroxydisulfate, whichhas a symmetrical structure and is difficult to activate, through the synergistic circulation effect between ions with different valence states of cobalt and iron. A generated active free radical group (SO4<.-> / .OH) can quickly and efficiently attack tetracycline molecules of antibiotics, and finally mineralize the tetracycline molecules into carbon dioxide and water molecules, so that the catalyst has certain practical application values.

The invention discloses a preparation method and an application of a Cd / CdS heterojunction visible light photocatalyst rich in sulfur vacancies. The method comprises the following steps: synthesizingan intermediate CdO / CdS composite material through a thermal treatment technology by using CdS prepared by a solvothermal technology as a precursor, and performing an in-situ chemical reduction technology by using sodium borohydride to directly obtain the Cd / CdS heterojunction visible light photocatalyst. The prepared Cd / CdS composite visible light photocatalyst contains a lot of sulfur vacancies,so the absorption and the utilization of visible lights by the catalyst are greatly improved, and the contact between highly-conductive Cd and CdS is close, thereby the photogenerated electrons can be well separated from holes, and the photocatalytic efficiency is high. The heterojunction photocatalyst has a high stability, has an excellent photocatalytic activity under the irradiation of visiblelights, and can be used for catalyzing photodegradation of water to produce hydrogen. The preparation method has the advantages of low requirements of preparation conditions, simplicity in operation,cheap and easily available raw materials, environmental protection, high visible light catalysis efficiency, and broad application prospect in the photocatalysis field.

The invention discloses a fuel cell catalyst taking multi-element compound as a carrier and a preparation method thereof, relating to a fuel cell catalyst and a preparation method thereof. The fuel cell catalyst of the invention adopts the mixed material of a granular carbon material (C1) and a linear carbon material (C2) as a carbon basal material; a precipitation thermal decompositing method iscarried out on the two basal materials to prepare a compound carrier MOx-(C1+C2) of a carbon carrier and an oxide; an in-situ chemical reduction method is carried to prepare a Pt / MOx-(C1+C2) catalyst; MOx is CeO2, SnO2, Co3O4 or NiO; C1 is carbon black, carbon microsphere or mesoporous carbon; C2 is carbon fiber or carbon nanometer tube; the linear carbon material is combined with the granular carbon material to form a three-dimensional compound network structure, so as to increase the three-phase reaction activity area of the catalyst; and the doped metal oxide enhances the anti-CO capacity of the catalyst, and improves the use ratio of platinum.

The invention provides a method for preparing a macromolecular material / graphene nanometer composite material by adopting continuous mixing in-situ reduction as well as the application thereof, and relates to the technical fields of a macromolecular material / graphene nanometer composite material and preparation thereof. The used equipment is water assisted melting and mixing extrusion equipment. The preparation method of the nanometer composite material comprises the following steps: pre-mixing a macromolecular material and a GO powder, adding the mixture into the water assisted melting and mixing extrusion equipment to perform mixing extrusion, dissolving a green and non-toxic chemical reducing agent into water to obtain a chemical reducing agent aqueous solution, injecting the obtained solution into macromolecular material melt in an extruding machine by virtue of a metering pump to perform mixing, adding water to promote stripping and dispersing of GO, in-situ chemical reduction andin-situ thermal reduction, and finally preparing a macromolecular material / reduced graphene oxide (RGO) nanometer composite material. In the nanometer composite material prepared by the method, the striping and dispersing of the RGO are good and the reduction degree is high; furthermore, the nanometer composite material has a relatively good dielectric property and mechanical property.