291results about How to "Improve oxidation activity" patented technology

An emission control catalyst that exhibits improved CO and HC reduction performance includes a supported platinum-based catalyst, and a supported palladium-gold catalyst. The two catalysts are coated onto different layers, zones, or monoliths of the substrate for the emission control catalyst such that the platinum-based catalyst encounters the exhaust stream before the palladium-gold catalyst. Zeolite may be added to the emission control catalyst as a hydrocarbon absorbing component to boost the oxidation activity of the palladium-gold catalyst.

An oxidation catalyst for treating an exhaust gas from a diesel engine and an exhaust system comprising the oxidation catalyst are described. The oxidation catalyst comprises: a first washcoat region for oxidising carbon monoxide (CO) and hydrocarbons (HCs), wherein the first washcoat region comprises a first platinum group metal (PGM) and a first support material; a second washcoat region for oxidising nitric oxide (NO), wherein the second washcoat region comprises platinum (Pt), manganese (Mn) and a second support material; and a substrate having an inlet end and an outlet end; wherein the second washcoat region is arranged to contact the exhaust gas at the outlet end of the substrate and after contact of the exhaust gas with the first washcoat region.

The invention belongs to the field of water treatment, and relates to a method for strengthening the activity of anaerobic ammoxidized microorganisms through polyvinyl alcohol-sodium alginate-activated carbon embedment. The method comprises the following steps of: soaking activated carbon in anaerobic ammoxidized basic inorganic salt solution, and preparing an embedding medium by using polyvinyl alcohol, sodium alginate and the activated carbon into in a proportion; and uniformly mixing treated anaerobic ammoxidized sludge and the embedding medium in a volume ratio to obtain immobilized balls, and culturing to obtain the anaerobic ammoxidized microorganisms steadily coupled on the activated carbon. The invention aims at wastewater with low carbon-nitrogen ratio, and can provide a method for embedding the anaerobic ammoxidized sludge by using the sodium alginate and the polyvinyl alcohol as carriers and the activated carbon as a strengthening agent, and a technology for strengthening the activity of the anaerobic ammoxidized microorganisms and enabling the anaerobic ammoxidized microorganisms to resist the influence of adverse environment. By the method, sewage plants can run more steadily for a long time, and the conditions of actual operation management of the sewage plants are met.

A partial oxidation catalyst of hydrocarbons; comprising a monolith support carrying a catalyst component, the catalyst component comprising a refractory inorganic oxide carrying an element of platinum group (a) and a refractory inorganic oxide (b).

Provided are a p-type electrode and a III-V group GaN-based compound semiconductor device using the same. The electrode includes a first layer disposed on a III-V group nitride compound semiconductor layer and formed of a Zn-based material containing a solute; and a second layer stacked on the first layer and formed of at least one selected from the group consisting of Au, Co, Pd, Pt, Ru, Rh, Ir, Ta, Cr, Mn, Mo, Tc, W, Re, Fe, Sc, Ti, Sn, Ge, Sb, Al, ITO, and ZnO. The Zn-based p-type electrode has excellent electrical, optical, and thermal properties.

The invention relates to a composite mineral-leaching bacteria colony and use of the same in biological metallurgy. The composite mineral-leaching bacteria colony has a preserving number of CGMCC No.2395 in the Common Micro-organism Center of China General Microbiological Culture Collection Center. The composite mineral-leaching bacteria colony has strong oxidative activity within a temperature range from 30 to 52 DEG C as well as a working pH value of between 0.8 and 2.25 and an arsenic ion tolerance of 0 to 20 g/L. The composite mineral-leaching bacteria colony is used for extracting and recovering gold or copper, and greatly expands the use range of biological metallurgy in gold mines. Meanwhile, due to the wide temperature adaptation range, the composite mineral-leaching bacteria colony improves the oxidation speed and reduces production cost. Therefore, the composite mineral-leaching bacteria colony has a significant application prospect in biological metallurgy industry.

An exhaust system for a compression ignition engine comprising an oxidation catalyst for treating carbon monoxide (CO) and hydrocarbons (HCs) in exhaust gas from the compression ignition engine, wherein the oxidation catalyst comprises: a platinum group metal (PGM) component selected from the group consisting of a platinum (Pt) component, a palladium (Pd) component and a combination thereof; an alkaline earth metal component; a support material comprising a modified alumina incorporating a heteroatom component; and a substrate, wherein the platinum group metal (PGM) component, the alkaline earth metal component and the support material are disposed on the substrate.

The invention discloses a method for preparing mineral organic fertilizer by using surplus sludge in municipal sewage plants. The method mainly comprises the following three steps: firstly reducing sludge in a sludge thickening tank, dehydrating the reduced sludge by adopting a catalytic ozonation method, carrying out subcritical water reaction on the dehydrated sludge, and discharging solids subjected to harmless treatment; finally mixing modified attapulgite clay with the sludge subjected to harmless treatment, chicken manure and microorganism beneficial microbial agents, and fermenting the mixture to obtain the mineral ecological organic fertilizer. The method is green and environment-friendly and realizes the harmless and resourceful treatment of the sludge; the obtained mineral organic fertilizer is capable of obviously improving the structure of soil, enabling the volume-weight of soil to be reduced, the holes of soil to be increased and the ventilation and water permeability of the soil to become good and adjusting the uniform growth of crops and has a good controlled release effect, thus the quality of the crops is improved.

The invention discloses a titanium silicalite molecular sieve synthesizing method which comprises the following steps: forming a crystallization mixture from a titanium source, a template agent, water, polyhydric alcohols, peroxide, a silicon source and an optional inorganic ammonium source, crystallizing, and recycling the titanium silicalite molecular sieve, wherein the silicon source refers to an organic silicon source and/or a solid silicon source. According to the method, the activity of the synthesized titanium silicalite molecular sieve can be improved, and the grain size is reduced.

The invention discloses a photocatalytic antibacterial biomass wood-plastic composite material and a preparation method thereof. The photocatalytic antibacterial biomass wood-plastic composite material mainly comprises the following constituents in parts by weight: 25 to 75 parts of thermoplastic plastic, 15 to 75 parts of wood powder, 5 to 20 parts of an inorganic filler, 1 to 10 parts of a modified nano TiO2 carried Ag+ and Cu2+ complex antimicrobial agent, 1 to 5 parts of a fire retardant, 1 to 10 parts of a lubricating agent, and 1 to 8 parts of a coupling agent. The composite material takes the modified nano TiO2 carried Ag+ and Cu2+ complex antimicrobial agent, the (waste) thermoplastic plastic, the (waste) wood powder and other auxiliaries as raw materials, so that the harm of mildew and rot and fungal infection of the wood-plastic composite material and termite and other insects is avoided, the environment is protected, and the resource waste is reduced. Taking the modified nano TiO2 carried Ag+ and Cu2+ complex antimicrobial agent as powder, the composite material has the characteristics that antibacterial and bactericidal effect is rapid and efficient, the composite material is safe and nontoxic, does not produce drug-resistance bacteria, is thorough, durable and stable, and has broad-spectrum antibacterial property, and the like, and further has the characteristics of double long effectiveness of photocatalytic antibacterial and antifungal effect of TiO2 and antibacterial and bactericidal effect of Ag+ and Cu2+.

The fluidized bed 3D electrode reactor for treating organic waste water includes a reaction bed body, a circulating filter pump, an air pump, a power source, and porous metal feeding electrodes and granular electrodes connected to the power source. It features that of the at least three porous metal feeding electrodes, at least one is active electrode capable of oxidizing and decomposing the organic matter inside the waste water, all are connected to the cathode and the anode of the power source and arranged inside the reaction bed body, and two adjacent ones are supported with anticorrosive insulating material and filled with granular electrodes. The present invention has high waste water treating efficiency, small size, simple operation, low treating cost and other advantages.

The invention relates to a titanium-silicon micro-mesoporous molecular sieve composite material and a synthetic method thereof. The titanium-silicon micro-mesoporous molecular sieve composite material is rich in silicon on the surfaces of crystal grains, wherein the surface silicon-titanium ratio is higher than that of a bulk phase. The synthetic method of the titanium-silicon micro-mesoporous molecular sieve composite material comprises the following steps: mixing a titanium source, a template, an organic silicon source, an inorganic ammonium source and water; hydrolyzing to propel alcohol, aging, and mixing with a solid silicon source; and then crystallizing in a closed reaction kettle and recovering the titanium-silicon micro-mesoporous molecular sieve composite material. The titanium-silicon micro-mesoporous molecular sieve composite material provided by the invention has high oxidative activity and the noneffective decomposition activity of hydrogen peroxide in side reaction is remarkably reduced.

The invention discloses a maturity process and a packaged technology for purifying water in a lake-river-mouth on-scale floating plant cultivation project. The main body comprises an outside protective cloth water barricading, a floating blanket type wave absorption zone, a floating plant purification area, an inboard water distribution barricading, an aeration deodorization reoxygenation zone and a submerged plant purification area. By the outside protected water distribution barricading and the floating blanket type wave absorption zone, boundaries of a project area are controlled, the water flow exchange between the water body in the project area and the lake surface is obstructed and storms is resisted; by the outside protected water distribution barricading and the inboard water distribution barricading, the inflow and outflow of the water of the project area are controlled, thereby even water distribution and uniform water power residence time are achieved; the main process unit for water purification is formed through cultivating floating plants on scale on large cage carriers with the biserial emplacement and the elastic mooring at the bottom of the lake; through deodorization and reoxygenation in the aeration zone, and oxygenation and purification in the submerged plant purification area, the odor in the water is eliminated and the water is resumed to the oxygenation state, the effects of the floating plant purification area to the downstream water body and surrounding environment are eliminated. The maturity process and the packaged technology can be used to control the related pollution among water bodies including rivers flowing into lakes pollution control, water flow flowing out of lakes pollution control, water purification of lake coastwise sewage discharge points, water purification of lake coastwise intake points (water resources area) and others, and have the remarkable efficacies of eliminating alga, nitrogen, phosphorus.

Disclosed are a core-shell structural anode catalyst for direct borohydride fuel cells and a preparation method thereof. The catalyst comprises Mcore-Aushell nano composite particles which utilize M as the core and utilizes Au as the shell, and the particle size of the Mcore-Aushell particles ranges from 10nm to 50nm. The preparation method includes steps: firstly, adding M-salt and a stabilizingagent into a solvent sequentially, introducing nitrogen gas into the solvent and then stirring and heating the solvent, introducing and stirring nitrogen gas again, dropping a reducing agent to realize reaction and obtain M-nano catalyst sol, and then obtaining M-nano particles after filtering and washing; secondly, dissolving the M-nano particles into solvent, adding stabilizing agent and introducing nitrogen gas into the solvent along with stirring, adding chloroauric acid-tetrahydrofuran solution, introducing nitrogen gas again, dropping reducing agent to realize reaction and prepare nano-catalyst sol, separating and washing the nano-catalyst sol, drying the nano-catalyst sol in vacuum, and finally preparing powdered Mcore-Aushell nano-particle catalyst by means of grinding. The core-shell structural anode catalyst for direct borohydride fuel cells has higher BH4 (tetrahydrobiopterin)-oxidation activity and is low in hydrogen evolution, and accordingly fuel utilization rate is improved.

To overcome the problem of a conventional catalyst and to provide an exhaust gas purifying catalyst that meets the requirement concerning Hg oxidation activity and SO₂ oxidation activity; i.e., an exhaust gas purifying catalyst which specifically reduces percent SO₂ oxidation, while maintaining percent Hg oxidation at a high level.

The invention provides an exhaust gas purifying catalyst which comprises a composition containing oxides of (i) titanium (Ti), (ii) molybdenum (Mo) and/or tungsten (W), (iii) vanadium (V), and (iv) phosphorus (P), wherein the catalyst contains Ti, Mo and/or W, and V in atomic proportions of 85 to 97.5:2 to 10:0.5 to 10, and has an atomic ratio of P/(sum of V and Mo and/or W) of 0.5 to 1.5, and an exhaust gas purifying method comprising exposing an exhaust gas containing a nitrogen oxide (NO_X) and metallic mercury (Hg) to the catalyst in the presence of ammonia as a reducing agent, to thereby perform reduction of NO_X contained in the exhaust gas and oxidation of metallic mercury (Hg) contained in the exhaust gas.

A catalyst for removing CO is composed of Au as active component, the co-catalyst chosen from Co, Fe, Mn, Cu, Zn, Ti, Sn, Mg, Li, Ce and Zr, and the porous carrier chosen from alumina, silicon oxide, molecular sieve, cellular ceramics and iron wire mesh. Its preparing process is also disclosed.

The invention realizes a catalyst which is hardly deteriorated even when volatile catalyst-poisoning compounds such as P and As are accumulated and which can reduce the rate of oxidation of SO₂ to a level as low as a fraction of that of the catalyst in the prior art, and provides an exhaust gas purification catalyst which can maintain a high activity and a low rate of oxidation of SO₂ for a long time even with any diversified coal, a method of producing the same, and an exhaust gas purification method using the same. Disclosed is an exhaust gas purification catalyst having a composition comprising oxides of titanium (Ti), molybdenum (Mo) and/or tungsten (W), vanadium (V) and bismuth (Bi), wherein the atomic ratio of Ti:(Mo and/or W):V is 75 to 98.9:1 to 0.1 to 10 and the atomic ratio of Bi/(Mo and/or W) is 0.1 to 0.8.

Provided is a catalyst composition using other metals different from noble metals as a catalytic activity component and which has an excellent catalytic activity even after a thermal duration treatment. Provided are an exhaust gas purifying catalyst composition which includes ceria-zirconia particles with a feature in that a peak arising from (111) plane is divided into two peak tops in an XRD pattern and in which a transition metal including at least one of Cu, Cr, Fe, Mn, Co, Ni, and Ag is supported on the ceria-zirconia particles, and a catalyst using the exhaust gas purifying catalyst composition.

The invention provides an electro-catalyst Pt/amTiO2/rGO and a preparation method, and belongs to the technical field of fuel-cell catalysts. The preparation method comprises the following steps: firstly, an improved sol-gel method is adopted to prepare TiO2-GO (graphene oxide) sol, the sol is volatilized naturally in water bath at the temperature of 25 DEG C, and a GO complex amTiO2/GO uniformly modified by amorphous TiO2 is obtained; and then chloroplatinic acid is taken as a platinum source, ethylene glycol is taken as a solvent and a reducing agent, Pt nanoparticles are loaded on amTiO2/GO with an impregnation reduction method, meanwhile, GO is reduced to reduced GO rGO, and the electro-catalyst Pt/amTiO2/rGO is obtained. For the catalyst, an amTiO2 modifier is uniformly dispersed on the surface of rGO, one function of the amTiO2 modifier is to solve the corrosion problem of rGO, another function is to increase the dispersion degree of the loaded Pt nanoparticles, meanwhile, the electrical conductivity of amTiO2 is improved by rGO, so that performance advantages of rGO and amTiO2 can be played sufficiently, the electrocatalytic activity and stability of the catalyst are improved, and the precious metal Pt is used efficiently. The electro-catalyst Pt/amTiO2/rGO and the preparation method have the advantages of simple technology, easiness in operation and environmental protection.

The invention discloses a method for preparing an active mixed material through a belt type roasting machine pelletizing method. The method comprises the following steps: (1) crushing and grinding ore; (2) burdening and uniformly mixing: fully and uniformly mixing the coal gangue subjected to fine grinding, a composite additive and water in an intensive mixer according to predetermined proportion,and fully wetting the materials; (3) pelletization: preparing pellets with preset granularity from the uniformly mixed ores; (4) roasting by a belt type roasting machine: distributing the pellets onthe belt type roasting machine, and drying, preheating, oxidizing and roasting, soaking and cooling the pellets; and (5) crushing and fine grinding: crushing and fine grinding the coal gangue pellet material to a set specific surface area to obtain the active mixed material. The invention provides a method for preparing the active mixed material through the belt type roasting machine pelletizing method. The method is suitable for large-scale production, the usage amount of the coal gangue reaches 85% or above, the coal gangue stockpiling problem can be thoroughly solved, and a high-quality mixed material is provided for the construction industry.

This invention relates to the cleaning of flue gas released from various combustion processes, particularly a surface deposition NH₃—SCR honeycomb catalyst and its preparation method. The catalyst is composed of framework material, TiO₂, V₂O₅ and WO₃, wherein the framework material is composed of clay, coal ash, mineral waste residue or their mixture. The mass fractions for framework material, TiO₂, V₂O₅, and WO₃ are 60 wt. % to 80 wt. %, 13 wt. % to 33 wt. %, 1 wt. % to 5 wt. %, and 0.1 wt. % to 2 wt. %, respectively. The nano V₂O₅—WO₃—TiO₂ particles were deposited on the surface of particle pore or honeycomb, and the performance of the catalyst could be greatly improved

The invention discloses an ethanol gas sensor based on an In2O3 microflower/SnO2 nanoparticle composite material and a preparation method of the sensor, belonging to the technical field of gas sensors. The ethanol gas sensor consists of a nickel-cadmium alloy heating coil, an alumina ceramic tube, a platinum wire, a gold electrode and an In2O3 microflower/SnO2 nanoparticle composite material. By utilizing the catalytic activity of SnO2 on In2O3, the oxidative activity of the material is improved, so that the sensitivity of the sensor is greatly improved, materials with morphology are directly mixed at the first time, the large specific surface area of the material is utilized, and the catalytic characteristics between oxides are utilized. According to the material, ethanol gas molecules are transported on the surface and have the characteristics of rapid adsorption and desorption, so that the response and recovery speed of the sensor is increased. Compared with an ethanol sensor manufactured by In2O3 microflowers which are not compounded with SnO2 nanoparticles, the ethanol sensor disclosed by the invention has the advantages that the sensitivity is greatly improved, and the sensitivity of the ethanol sensor disclosed by the invention is about 9.5 times that of the sensitivity of the ethanol sensor manufactured by In2O3 microflowers.