116 results about "Redox catalyst" patented technology

The present invention provides both crosslinked polymer compositions capable of forming hydrogels upon exposure to an aqueous environment and thiosulfonate hydrogel-forming components. The thiosulfonate hydrogel-forming components of the invention are preferably multi-arm thiosulfonate polymer derivatives that form a crosslinked polymer composition when exposed to a base without requiring the presence of a second cross-linking reagent, redox catalyst, or radiation. Methods for forming hydrogel compositions, as well as methods for using the hydrogels, are also provided.

A F-type electrochemical cell, which is a lithium air battery, includes a positive electrode facing a negative electrode composed of metallic lithium with a separator provided therebetween in a casing. Air is capable of flow to the positive electrode. A nonaqueous electrolytic solution is charged into a space between the positive electrode and the negative electrode. At least one of the positive electrode and the nonaqueous electrolytic solution of the lithium air battery contains a compound having a stable radical skeleton. The compound also serves as a redox catalyst for oxygen.

A fuel cell, which can supply stable output even at elevated temperatures and can maintain its power generation performance over a long period of time, can be realized by an electrode for a fuel cell comprising a catalyst layer formed of a catalyst composite and a binder, the catalyst composite comprising a proton-conductive inorganic oxide and an oxidation-reduction catalyst phase supported on the proton-conductive inorganic oxide, the proton-conductive inorganic oxide comprising a catalyst carrier selected from tin(Sn)-doped In2O3, fluorine(F)-doped SnO2, and antimony(Sb)-doped SnO2 and an oxide particle phase chemically bonded to the surface of the catalyst carrier. The catalyst composite is manufactured by dispersing a catalyst carrier in a solution containing a material as a starting material for an oxide particle phase, heat treating the dispersion to form a proton-conductive inorganic oxide, further dispersing the proton-conductive inorganic oxide in a catalyst precursor-containing solution, and subjecting the dispersion to heat treatment or pH adjustment to deposit a catalyst phase.

A polymerized hydrogel composition for hydrating or dehydrating a surface, particularly a dermatological surface, to which it is applied and a method for forming the composition. The composition is comprised of a mixture of two polymerizable materials, a two-part redox catalyst system and a two-part polymerization medium. The percentage by weight of each element in the composition may be varied within stated percentage ranges and depending to the desired application. The rate at which hydration or dehydration occurs may be controllably altered by varying the percentages of certain of the composition elements and by adding either or both of a fibrous filler material and a humectant to the composition.

This invention relates generally to a ruthenium stabilized oxidation-reduction catalyst useful for oxidizing carbon monoxide, and volatile organic compounds, and reducing nitrogen oxide species in oxidizing environments, substantially without the formation of toxic and volatile ruthenium oxide species upon said oxidizing environment being at high temperatures.

The present invention provides a method for detecting probe-target substrate binding. In particular, the present invention provides a method for detecting a surface bound target complex by detecting the redox reaction of a redox transition metal complex that is catalyzed by a redox-catalyst complex.

The invention is directed to an electrode, suitable for use in a fuel cell, consisting of a microporous current collector incorporating a multitude of domains and wherein each domain contains soluble redox catalyst.

The present invention provides both crosslinked polymer compositions capable of forming hydrogel upon exposure to an aqueous environment and thiosulfonate hydrogel-forming components. The thiosulfonate hydrogel-forming components of the invention are preferably multi-arm thiosulfonate polymer derivatives that form a crosslinked polymer composition when exposed to a base without requiring the presence of a second cross-linking reagent, redox catalyst, or radiation. Methods for forming hydrogel compositions, as well as methods for using the hydrogel, are also provided.

Disclosed are systems for the electrocatalytic reduction of oxygen, having redox mediator / redox catalyst pairs and an electrolyte solution in contact with an electrode. The redox mediator is included in the electrolyte solution, and the redox catalyst may be included in the electrolyte solution, or alternatively, may be in contact with the electrolyte solution. In one form a cobalt redox catalyst is used with a quinone redox mediator. In another form a nitrogen oxide redox catalyst is used with a nitroxyl type redox mediator. The systems can be used in electrochemical cells wherein neither the anode nor the cathode comprise an expensive metal such as platinum.

To provide a tandem dye-sensitized solar cell having a novel structure capable of improving the light absorption efficiency and being manufactured less expensively. A dye-sensitized solar cell 10 is configured by including, in order from the light incident side, an anode substrate 12, a first dye-carrying porous oxide semiconductor layer 14, a first electrolyte layer 16a, an electrolyte redox catalyst layer 18, a second dye-carrying porous oxide semiconductor layer 20, a porous support layer 19, a second electrolyte layer 16b, and a cathode substrate 22. The electrons extracted from a conductor layer 12b by a conductor are introduced into the cathode substrate 22, so that a battery circuit, for example, for a lighting power source is configured.

An exhaust gas purification apparatus includes an exhaust gas passage, a first oxidation catalyst, a selective catalytic reduction catalyst, an oxidation-reduction catalyst and a urea water supply device. Exhaust gas is flowed through the first oxidation catalyst. The first oxidation catalyst is disposed in the exhaust gas passage. The selective catalytic reduction catalyst is disposed downstream of the first oxidation catalyst. The oxidation-reduction catalyst is disposed downstream of the selective catalytic reduction catalyst. The oxidation-reduction catalyst has reducing property and oxidizing property which are influenced by temperature, wherein the oxidizing property of the oxidation-reduction catalyst is greater than the reducing property of the oxidation-reduction catalyst under a temperature that is higher than a temperature under which the reducing property of the oxidation-reduction catalyst is greater than the oxidizing property of the oxidation-reduction catalyst. The urea water supply device supplies urea water upstream of the selective catalytic reduction catalyst.

The invention provides a polyether-based polycarboxylic acid series hyper-dispersant which is prepared by copolymerization of polyethlene glycol and unsaturated carboxylic acid or the ramification under the action of redox system catalyst, and a synthesizing method which belongs to the water reducing agent field. The method uses the new type redox catalyst, synthesizes a polyether-based hyper-dispersant with high efficiency. The method has simple processing technique, conquers difficult operation caused by low reaction temperature and energy waste caused by high temperature. The hyper-dispersant and the synthesizing method have advantages of environmental-friendly, low energy consumption and low cost.

The invention provides a carbon-based platinum-silver-palladium ternary alloy catalyst. According to the catalyst, a platinum-silver-palladium ternary alloy is uniformly supported on a carbon black surface with a hollow structure; the platinum-silver-palladium ternary alloy is an alloy solid solution taking silver as a solvent and taking platinum and palladium as solutes, and the particle size ofthe supported alloy particles is 6-8nm. The invention further provides preparation and application of the carbon-based platinum-silver-palladium ternary alloy catalyst. The carbon-based platinum-silver-palladium ternary alloy catalyst provided by the invention is a platinum-palladium-silver (Pt-Pd-Ag) ternary alloy layer redox catalyst with low Pt capacity, and an oxygen reduction catalyst with high activity and high stability. The mass activity of the catalyst is about 12 times that of a commercial Pt / C catalyst, and after tested by 50000 cycles, the stability of the catalyst is also kept invariable.

Provided is a method for producing a wiring harness including a sealing member having higher airtightness, the method including a coat formation step of forming a coat of a composition solution by providing the composition solution that contains at least a photo polymerization initiator, a thermal radical polymerization initiator, a redox catalyst and a polymerizable compound to an exposed bunched portion and a coated bunched portion that is adjacent to the exposed bunched portion of the bunch of electric wires, and a light irradiation step of irradiating the coat formed on the exposed bunched portion and the adjacent coated bunched portion with light to photocure the coat.

The invention discloses a lotion for removing color spots on the surface of silverware. The lotion is mainly prepared from the following components in parts by weight: 65-89 parts of deionized water, 5-15 parts of glycerol or glycol and 1-5 parts of nano titanium dioxide. Nano titanium dioxide is used as an oxidation reduction catalyst in the lotion, a great number of photoelectrons with strong reducing property are formed in a solution through light energy absorption, and the photoelectrons can be used for reducing silver in color spots such as silver sulfide and the like into elemental silver; meanwhile, nano titanium dioxide is used for producing a great number of photoholes with strong oxidation property, and the photoholes can be reduced by alcohol, so that no secondary pollution is caused in the whole process. Alcohol in the lotion is used as a sacrifice agent to be oxidized, and excess alcohol is used as a wetting agent, so that the catalytic activity of nano titanium dioxide can be effectively promoted. The lotion is free of silver loss while removing the color spots on the surface of the silverware, capable of effectively treating silver plated or fine pattern silverware, convenient to operate, free of active metal or corrosive substances to participate in reaction, and free of potential safety hazards.

Provided are a manganese oxide nanowire, specifically, a manganese oxide nanowire having an aspect ratio of 20 or more, which can be widely used in various fields, including batteries, oxygen generators, and redox catalysts, a rechargeable battery including the manganese oxide nanowire, and a method of producing manganese oxide. Since the manganese oxide nanowire having a large aspect ratio has an increased specific surface area, it can be effectively used in various fields. In addition, various kinds of manganese oxide nanowires can be simply manufactured.

The invention discloses a preparation method of a compound containing C (sp2)-N bonds as shown in a formula I. The preparation method includes the step: performing constant-current electrolysis reaction on a compound as shown in a formula II and a compound as shown in a formula III in the presence of copper catalysts, oxidation reduction catalysts and alkali reagents in organic solvents in a non-separation electrolytic tank to obtain the compound containing the C (sp2)-N bonds as shown in the formula I, wherein the oxidation reduction catalysts are iodized salt. According to the preparation method, conventional expensive oxidants can be omitted, the compound containing the C (sp2)-N bonds can be selectively transformed into a C (sp2)-N bond product, and the compound is high in yield, goodin purity and more suitable for industrial production.

The invention provides the use of silicon particles as redox catalyst, an electrochemical device and method thereof. As electrocatalyst, the silicon particles catalyze a redox reaction such as oxidization of the redox reactant such as renewable fuels e.g. methanol, ethanol and glucose. The device such as a fuel cell comprises a redox reactant and a catalytic composition comprising silicon nanoparticles. The silicon particles catalyze the redox reaction on an electrode such as anode in the device. In preferred embodiments, the electrocatalysis is dramatically improved under low illuminance such as in darkness. The invention can be widely used in applications related to for example a fuel cell, a sensor, an electrochemical reactor, and a memory.

The invention discloses a method for efficiently recycling elemental sulfur in a process of treating sulfur dioxide flue gas by using sodium sulfide. The method comprises the following steps of: adding a self-redox catalyst without limiting the ratio of the amount of substance of sodium hydrogen sulfite to the amount of substance of sodium thiosulfate in a process of catalyzing and recycling the sulfur at a low temperature; then stirring and heating to 60-100 DEG C; filtering the self-redox catalyst after the solution becomes light yellow, continuously stirring for reaction for 1-4 hours; filtering and separating to acquire the elemental sulfur; and evaporating, freezing and crystallizing the filtrate to acquire mirabilite. The catalyst has the application advantage of avoiding high-temperature and high-pressure reaction and keeping the ratio of the amount of substance of the sodium hydrogen sulfite to the amount of substance of the sodium thiosulfate to 2:1; the self-redox catalyst can be reused and the recovery rate of the self-redox catalyst is more than 99.5%; the recovery rate of the sulfur is more than 99%; the recovery rate of the mirabilite is more than 60%; the concentration of tail gas SO2 is lower than 50ppm; and therefore, the elemental sulfur can be prepared at a low temperature and at normal pressure, products with high added-value can be recycled, and the tail gas can reach the existing SO2 emission standard.

A method for producing a wiring harness including a sealing member having higher airtightness includes a coat formation step of forming a coat by applying a composition solution that contains at least a photo polymerization initiator, a thermal radical polymerization initiator, a redox catalyst and a polymerizable compound to an exposed bunched portion and a coated bunched portion that is adjacent to the exposed bunched portion of the bunch of electric wires, and a light irradiation step of irradiating the coat formed on the exposed bunched portion and the adjacent coated bunched portion with light to photocure the coat.

The invention relates to a process for removing hydrogen sulfide and recovering sulfur from a gas stream, comprising the steps of: contacting said gas stream with an aqueous catalyst solution of a polyvalent metal redox catalyst in a contacting zone to absorb said hydrogen sulfide and form a reduced catalyst solution comprising reduced polyvalent metal redox catalyst and sulfur particles; oxidizing said reduced catalyst solution while removing sulfur particles to form said oxidized aqueous catalyst solution comprising polyvalent metal redox catalyst in an oxidized state with sulfur particles removed; and recovering sulfur by transferring at least one of said sulfur particles and foam to a separation zone; wherein a coagulating reagent is added to a feed of said separation zone prior to entering said separation zone to promote settlement of sulfur particles.

An engine system including a lean burn active ignition engine and aftertreatment system, and a method for operating such a system, are disclosed. In a representative embodiment, the lean burn active ignition engine includes an engine block including plural cylinders, an intake manifold adapted to provide charge air to the cylinders, an exhaust manifold, an active ignition source; and fuel and air handling systems that provide fuel / charge air mixture such that an air-to-fuel ratio of the mixed charge air and fuel in each of the engine cylinders is substantially greater than a stoichiometric quantity to achieve a lean burn condition. An exhaust gas aftertreatment system is fluidly coupled to an outlet of the exhaust manifold and includes an oxidation-reduction catalyst, and a selective catalytic reduction (SCR) catalyst fluidly coupled to the oxidation-reduction catalyst and positioned downstream of the oxidation-reduction catalyst.

The invention discloses a preparation method of a cobalt nitrogen co-doped biomass carbon oxidation reduction catalyst. The preparation method comprises following steps: biomass porous carbon materialpreparation; vacuum freeze drying; and cobalt nitrogen co-doped biomass carbon porous material preparation. The advantages are that: the raw materials are easily available and cheap; the performanceis close to commercially available platinum-carbon catalyst, an excellent method is provided for development of a non-noble metal catalyst, and effective basis is provided for further experiment optimization and industrial production.

Provided are a manganese oxide nanowire, specifically, a manganese oxide nanowire having an aspect ratio of 20 or more, which can be widely used in various fields, including batteries, oxygen generators, and redox catalysts, a rechargeable battery including the manganese oxide nanowire, and a method of producing manganese oxide. Since the manganese oxide nanowire having a large aspect ratio has an increased specific surface area, it can be effectively used in various fields. In addition, various kinds of manganese oxide nanowires can be simply manufactured.

The invention discloses a redox catalyst for metal-air fuel cells and a preparation method of the redox catalyst and belongs to the technical field of air fuel cells. A formula of the redox catalyst for the metal-air fuel cells comprises the following ingredients: 20g to 50g of Pt / c platinum / carbon, 30g to 50g of melamine, 40g to 60g of ferric chloride, 20g to 40g of potassium hydroxide, 15g to 30g of methanol, 20g to 30g of Nafion solution and 10g to 20g of alumina polishing powder. The preparation method of the redox catalyst for the metal-air fuel cells comprises the following specific steps: (S1) obtaining a platinum-carbon mixture; (S2) obtaining a catalyst coagulum; (S3) carrying out uniform mixing thoroughly; (S5) preparing redox catalyst powder. According to the redox catalyst and the preparation method thereof, the perfluorosulfonate polymer Nafion solution is adopted as a coating and a support of the catalyst, so that a membrane electrode can be formed, and the transfer resistance of substances and the resistance of the electrode are lowered; the prepared redox catalyst is low in price and can meet the development requirements of large-scale commercial fuel cells.

The invention relates to a simple preparation method of Fe (ferrous), Co (cobalt) and N (nitrogen) three-element co-doping three-dimensional graphene with catalytic synergistic effect. The preparation method comprises the following steps of enabling soluble fully-aromatic PBI (polybenzimidazole) to react with a ferrous salt and cobalt salt mixing solution; firstly, preparing a complex of PBI, ferrous ions and cobalt ions; adding a nanometer template agent into the reaction mixing liquid; regularly arranging the complex at the surface of the template agent; pyrolyzing, removing a template, and the like, so as to prepare the Fe-Co-N three-element co-doping three-dimensional graphene. The PBI is selected from fully-aromatic macromolecules, such as ABPBI and mPBI, and the viscosity average molecular weigh is 20,000 to 40,000; the molar ratio of ferrous salt and cobalt salt is 1:2 to 2:1; the mass ratio of PBI and ferrous salt and cobalt salt mixture is 1:2 to 2:1; the template agent is selected from nanometer magnesium oxide, ferric oxide and ferric hydroxide nanoparticles; the particle size of the template agent is 5 to 50nm; the mass ratio of PBI and template agent is 3:1 to 1:3; the pyrolysis temperature is 700 to 1000 DEG C; the Fe-Co-N three-element co-doping three-dimensional graphene can be applied to the fields of redox reaction catalysts, fuel batteries, metal air battery redox catalysts, water electrolysis separation catalysts, supercapacitors and the like.