187 results about "Platinum compounds" patented technology

The invention relates to a catalyst for preparing low-carbon alkenes by low-carbon alkane dehydrogenation and a preparation method thereof. The invention mainly solves the problems of high inactivation tendency of carbon deposit and poor stability of the catalyst in the high-temperature service process in the prior art. The technical scheme is as follows: metal tin and other transition metal assistants are introduced into the supporter in the alumina supporter precursor kneading process, and extruded to form the composite metal oxide supporter; and an impregnation method is utilized to support the platinum compound, i.e. a platinum-impregnated soluble salt water solution is roasted by drying and treated with steam to obtain the platinum-tin catalyst. The technical scheme well solves the problems, and can be used in industrial production of the catalyst for preparing low-carbon alkenes by low-carbon alkane dehydrogenation.

The invention discloses a flame-retardant ceramic composite material which comprises the following components in parts by weight: 100 parts of polyolefin, 0-100 parts of silicone rubber, 1-100 parts of silica, 0-30 parts of silicone oil, 0.00001-10 parts of platinum complex or platinum compound calculated based on platinum, 0-10 parts of coupling agent, 0-100 parts of flame retardant, 1-250 parts of porcelain powder, 0-10 parts of antioxidant, and 0.01-10 parts of vulcanizing agent. The materials are mixed in a kneading machine, the materials are added into the kneading machine through vacuumizing and then uniformly mixed so as to obtain bulk ceramic rubber, and after being cooled, the cooled rubber is subjected to open milling by adding the vulcanizing agent so as to obtain the flame-retardant ceramic composite material. The flame-retardant ceramic composite material disclosed by the invention is easy to process and low in production cost, and can be ablated into a ceramic shell so as to protect a burnt object from being damaged. Because a platinum complex or a platinum compound is added in the flame-retardant ceramic composite material disclosed by the invention, the sintering temperature of the flame-retardant ceramic composite material can be reduced, the reaction speed of preparation can be increased, the production efficiency is improved, and the production cost is lowered.

The invention relates to a flame-retardant and fire-resistant ceramic silicone rubber and a preparation method thereof. The silicone rubber comprises, by weight, 100 parts of methyl vinyl silicone rubber, 1-80 parts of silica, 0-10 parts of a concentrative crosslinking agent, 0-20 parts of a structurized control agent, 0.1-10 parts of a silane coupling agent, 0-10 parts of organic fibers, 0-50 parts of high temperature resisting resin, 1-160 parts of ceramic powder, 1-80 parts of a flame retardant, 0-15 parts of an assistant, 0-30 parts of a heat proofing agent, 0.000001-0.1 parts of a platinum compound (by platinum) and 0.1-5 parts of a vulcanizing agent. The invention also provides a preparation method of the silicone rubber. The flame-retardant and fire-resistant ceramic silicone rubber has excellent mechanical performances and good heatproof performance at normal temperature, and solves the disadvantages of ceramic cracks and poor electric insulation performance of traditional ceramic silicone rubbers, induced by addition of a large amount of glass powder.

The invention discloses flame-retardant ceramic silicone rubber. The flame-retardant ceramic silicone rubber contains the following materials in parts by weight: 100 parts of silicon rubber, 1-100 parts of silica, 0-30 parts of silicone oil, 0.00001-10 parts of platinum in platinum complex or platinum compound, 0-10 parts of coupling agent, 1-100 parts of flame retardant, 1-150 parts of ceramic powder and 0.01-10 parts of vulcanizing agent. A preparation method of the flame-retardant ceramic silicone rubber comprises the steps of milling the materials in a kneader, vacuumizing, adding into the kneader, milling uniformly to form lumpish ceramic rubber, cooling, adding the vulcanizing agent, and carrying out open milling, thereby obtaining the flame-retardant ceramic silicone rubber. The flame-retardant ceramic silicone rubber is easy to process and low in production cost and can be ablated into a ceramic-like shell, so as to protect an ablated object from being damaged. According to the flame-retardant ceramic silicone rubber disclosed by the invention, due to the addition of the platinum complex or platinum compound, the sintering temperature for the flame-retardant ceramic silicone rubber can be lowered, and the reaction rate of preparation can be increased, so that the production efficiency is increased, and the production cost is reduced.

The invention discloses a catalyst for preparing halogenated aniline through catalytic hydrogenation of halogenated nitrobenzene. The catalyst comprises an activated carbon carrier and active component platinum adhered to the activated carbon carrier, and the mass percent of platinum in the catalyst is 0.1%-5%. The preparation method of the catalyst comprises the following steps: 1, pretreating activated carbon with inorganic acid, then washing to be neutral, and reserving after drying; 2, placing the dried activated carbon in carbonate aqueous solution for impregnating; 3, dissolving a platinum compound in water to obtain active component solution; 4, dripping the active component solution into the carbonate aqueous solution with impregnated activated carbon, carrying out insulated impregnating, adjusting the pH value of the system, and filtering after cooling to obtain a filter cake; 5, reducing the filter cake with a reducing agent, washing to be neutral, and drying to obtain the catalyst. The catalyst is simple in preparation process, can be repeatedly used, is high in reactivity, high in selectivity and good in stability, and can inhibit the side reactions of dehalogenation effectively.

The invention provides a flame-retardant dealcoholization type room-temperature curing silicon rubber, comprising: (1) polysiloxane, wherein the end of the polysiloxane is trimethoxy; (2) reinforcing fillers such as white carbon black, calcium carbonate and the like; (3) flame-retardant fillers such as aluminum hydroxide, zinc carbonate, carbon black and the like; (4) platinum compound added after the mixing; and (5) a condensation curing agent which comprises methyltrimethoxy silane, a silane coupling agent, organic titanate or organic tin compounds. The flame retardant dealcoholization type room-temperature curing silicon rubber of the invention has the characteristics of quick curing, excellent binding force to various base materials, good flame retardance, no halogen and the like.

The invention relates to a preparation method of a catalyst for catalytic combustion of VOCs (volatile organic compounds). The preparation method comprises the following steps of: dissolving a vanadium-containing compound and a lanthanide-series compound in an oxalic acid solution and stirring till the compounds are complete dissolved; dissolving TiO2 powder in the solution, stirring at normal temperature, filtering, washing, drying, grinding to obtain powder, and calcining the powder for 3 hours at the temperature of 500 DEG C, thus obtaining MOx/V2O5-TiO2 powder; mixing and stirring the MOx/V2O5-TiO2 powder and a platinum-containing compound solution, drying sediment, and calcining the sediment for 5 hours at the temperature of 400 DEG C, thus obtaining the catalyst Pt/MOx/V2O5-TiO2. The catalyst prepared by the method provides a large specific surface area and has a very high catalytic activity to the catalytic combustion reaction of benzene series materials such as benzene; in addition, raw materials for preparation are easy to obtain and the technology is simple; the catalyst can be used repeatedly with stable activity, and the defects that the traditional noble metal catalyst is sintered easily and causes intoxication easily are overcome. The catalyst can also be used for eliminating other volatile organic compounds such as halogenated hydrocarbon, ketone and ester from industrial waste gas in a catalytic combustion manner.

Gasoline engines equipped with three-way catalysts emit less NOx, hydrocarbons and carbon monoxide when operated on fuels containing a bimetallic catalyst comprising rhodium acetylacetonate and a fuel-soluble platinum compound such as diphenyl cyclooctadiene platinum(II) or platinum acetyl acetonate. The total metals in the additive will be dosed at a concentration of less than about 2 ppm (milligrams of metal to liter of gasoline) based on the amount of gasoline burned in the engine. Preferred dosages will be from about 0.15 to about 1.5 ppm, with a ratio of platinum to rhodium of from about 3:1 to about 15:1.

Provided is a thermally-curable heat-conductive silicone grease composition which has a high shape-retaining property in an early stage even when the viscosity of the composition is low (i.e., the composition is easy to apply) in the early stage, and which becomes soft (has low hardness) after being cured. A thermally-curable heat-conductive silicone grease composition comprising, as essential components:

• (A) an organopolysiloxane having a viscosity of 100 to 100,000 mPa·s at 25° C. and containing at least one alkenyl group per molecule;
• (B) an organopolysiloxane represented by general formula (1)

(wherein R¹ represents a monovalent hydrocarbon group; R² represents an alkyl group, an alkoxyalkyl group, an alkenyl group or an acyl group; n represents 2 to 100; and a represents 1 to 3);

• (C) an organohydrogenpolysiloxane containing at least two hydrogen atoms each directly bound to a silicon atom per molecule;
• (D) a catalyst selected from the group consisting of platinum and platinum compounds;
• (F) a heat-conductive filler having a heat conductivity of 10 W/m·° C. or more; and
• (G) a silica micropowder.

The invention discloses a Pdx@Pt/C core-shell structure cathode catalyst for a fuel cell and a preparation method of the Pdx@Pt/C core-shell structure cathode catalyst. The method comprises the following steps: (1) adding a palladium precursor and a conductive carrier to N,N-dimethyl formamide or ethanol, carrying out ultrasonic mixing, and then adding borane.N,N-diethyl aniline or sodium borohydride, reacting at a room temperature for 0.5-1.5h, carrying out centrifugal washing and vacuum drying and then obtaining a carbon-supported Pd catalyst, namely Pd/C; and (2) ultrasonically dispersing the Pd/C prepared in the step (1) into a formic acid solution with the concentration of 1-5ml formic acid/20ml water, adding a water solution of a platinum compound at the atomic ratio of Pt to Pd being 1 to 1 or 1 to 2 or 1 to 3, reacting at the room temperature for 2-6h, and carrying out centrifugal washing and vacuum drying to obtain the product. The catalyst with high catalytic activity and stability is prepared by a primary cell reaction principle; the catalyst is lower than a pure Pt catalyst in cost; the preparation method is simple, convenient, mild in condition and easy to operate; and the problem that a high temperature and a surfactant are required for preparation of the core-shell structure catalyst by a conventional chemical reduction method is solved.

The invention discloses a method for preparing a low-carbon alkane dehydrogenation catalyst. The method comprises the following steps: 1) dropping ammoniacal liquor into a ZnCl2 aqueous solution to obtain white Zn(OH)2 precipitate, fully stirring the precipitate and dissolving the precipitate, adding water for dilution to obtain a Zn(NH3)4Cl2 solution, adding a platinum-containing compound, fully stirring the material and heating the material to obtain an impregnation liquid; and 2) impregnating a carrier by the impregnation liquid obtained in the step 1), drying the carrier and calcining the carrier to obtain the low-carbon alkane dehydrogenation catalyst. Through a complexation co-impregnation method, Pt and Zn are loaded on the surface of the carrier, and the low-carbon alkane dehydrogenation catalyst with good dehydrogenation activity is prepared.

The invention discloses a method for preparing a low-carbon alkane dehydrogenation catalyst. The method comprises the following steps: 1)mixing a ZSM-5 molecular sieve, alumina, sesbania powder and a dilute nitric acid solution, beating the materials, kneading the materials, extruding the materials, drying and performing calcination to obtain a ZSM-5 molecular sieve-doped alumina carrier; 2) impregnating the carrier by using a Sn-containing predecessor solution, drying the carrier and performing calcination on the carrier to obtain the Sn-containing carrier; 3) dropping ammoniacal liquor and adding the material into a ZnCl2 aqueous solution, preparing a Zn(NH3)4C12 solution, adding a platinum-containing compound to prepare an impregnation solution; and 4) performing impregnation on the Sn-containing carrier by using the impregnation solution in the step 4), drying the material, and performing calcination to obtain the low-carbon alkane dehydrogenation catalyst. The prepared low-carbon alkane dehydrogenation catalyst has high alkane conversion rate, alkene selectivity and good stability in a low carbon alkane dehydrogenation reaction.

Platinum compounds, pharmaceutically acceptable salts, and prodrugs thereof. Compositions that include the platinum compounds, either alone or in combination with at least one additional therapeutic agent, with a pharmaceutically acceptable carrier. Methods for using the platinum compounds, either alone or in combination with at least one additional therapeutic agent, in the prophylaxis or treatment of proliferative diseases.

The invention relates to a preparation method of a supported platinum titanium dioxide catalyst based on strong interaction of metal and a carrier and an application of the supported platinum titaniumdioxide catalyst in selective hydrogenation reaction. The catalyst is prepared by taking titanium dioxide as a carrier and a platinum compound as a precursor through an ultraviolet light reduction method, and after hydrogen atmosphere reduction, platinum nanoparticles and the titanium dioxide carrier generate strong metal carrier interaction. The characterization results show that the catalyst contains platinum single atoms and platinum nanoparticles loaded on the surface of a carrier, after reduction, the platinum nanoparticles are embedded by the carrier, and the single atoms stably exist,so that the nanoparticles are prevented from further agglomeration to influence the reaction performance, and meanwhile, a Pt-Ti interface is increased. The catalyst is applied to a selective hydrogenation reaction, and the selectivity is greatly improved. The preparation method provided by the invention is simple and easy to implement, the exposed active sites can be regulated and controlled, theactivity and selectivity of the reaction are improved, and the preparation method has an excellent application prospect.

The invention discloses a self-adhesive type ceramic composite belt. The self-adhesive type ceramic composite belt comprises a self-adhesive ceramic glue layer, a reinforcing layer and an isolating layer, wherein the reinforcing layer and the isolating layer are respectively positioned at the two sides of the self-adhesive ceramic glue layer; the self-adhesive ceramic glue layer and the reinforcing layer are fixed together; the self-adhesive ceramic glue layer is prepared from the following components in parts by weight: 60-100 parts of silicon rubber, 20-100 parts of white carbon black, 20-120 parts of ceramic powder, 1-20 parts of one or more of boric acid, boric anhydride, borate, polyborosiloxane or a boron-containing polymer, 1-20 parts of silicone oil, 0.00001-10 parts of platinum complex and/or platinum compounds, and 0.1-10 parts of a coupling agent. The self-adhesive type ceramic composite belt disclosed by the invention has self-adhesion, is mutually lapped and adhered during winding to achieve good sealing effects, has good moisture-proof and waterproof performances; during production, an isolating film is only needed to be added when the composite belt product is rolled, so that the process is simple and the production is easy.

The invention discloses a Pt-based fuel cell cathode catalyst of a transition metal element doped with TiO2 and a carbon compound with high specific surface area as a carrier, and a preparation method of the Pt-based fuel cell cathode catalyst. The method comprises the steps of adding a Ti compound and a transition metal M precursor to water, adding carbon with high specific surface area, carrying out ultrasonic mixing evenly and then obtaining a composite oxide carbon carrier C-Ti<x>M<1-x>O<2> by using a hydrothermal method; and mixing a platinum compound water solution with the C-Ti<x>M<1-x>O<2> and obtaining a composite oxide carbon carrier-loaded nano Pt catalyst, namely a Pt/C-Ti<x>M<1-x>O<2> catalyst by adopting an impregnation method. Compared with commercial Pt/C, the prepared Pt/C-Ti<x>M<1-x>O<2> catalyst has higher catalytic activity and stability due to interaction between a metal and the carrier; the preparation method is simple and convenient, mild in condition and easy to operate; the problems of high surface Pt agglomeration degree and poor stability of the catalyst prepared by adopting a conventional impregnation method are solved; and the composite oxide carbon carrier-loaded nano Pt catalyst is a powder catalyst suitable for a proton exchange membrane fuel cell.

The present invention provides compositions, preparations, formulations, kits, and methods useful for treating subjects having cancer or at risk of developing cancer. Some embodiments of the invention may comprise a compound including platinum (e.g., platinum(II) or platinum(IV)) compound comprising a beta-diketonate ligand.

The invention relates to a preparation method for Pt/C catalyst used in proton exchange membrane fuel cell, comprising contacting reducing agent with a suspension liquid. The suspension liquid comprises protective agent and carbon carrier adsorbing platinum compound, wherein said protective agent is one of tartaric acid, malic acid and dextrose or several kinds. In the preparation method provided by the invention, one of tartaric acid, malic acid and dextrose or several kinds are used as protective agent. In this way, nanometer grain of catalyst is formed easily while reaction time is shortened greatly.