112results about How to "Low precious metal content" patented technology

The invention is directed to core / shell type catalyst particles comprising a Mcore / Mshell structure with Mcore=inner particle core and Mshell=outer particle shell, wherein the medium diameter of the catalyst particle (dcore+shell) is in the range of 20 to 100 nm, 5 preferably in the range of 20 to 50 nm. The thickness of the outer shell (tshell) is about 5 to 20% of the diamet the inner particle core of said catalyst particle, preferably comprising at least 3 atomic layers. The inner particle core (Mcore) of the particles comprises metal or ceramic materials, whereas the material of the outer shell (Mshell) comprises precious metals and / or alloys thereof. The core / shell type catalyst particles are preferably supported on suitable support materials such as carbon black and can be used as electrocatalysts for fuel cells and for other catalytic applications.

The invention relates to a method for recovering noble metals from spent automotive exhaust catalysts, comprising the following processes: 1. mixing the spent automotive exhaust catalyst with a reducing agent, an additive and a trapping agent; 2. putting the mixed materials into a clay graphite crucible, and putting the clay graphite crucible into an electric furnace or an electric arc furnace for smelting, thus obtaining a noble metal phase; 3. selectively leaching base metals from the noble metal phase, thus obtaining the enrichment of the noble metal, refining the enrichment of the noble metal to produce platinum, palladium and rhodium products. The method is characterized by simple process flow and high recovery rates of noble metals. The platinum, palladium and rhodium in the waste slag are less than 1g / t and the product purity is 99.95%.

The invention relates to a superlarge thickness hydrogen chromium molybdenum steel plate for hydrogenation equipment and a manufacture method thereof, and belongs to the technical field of ferrous metallurgy. A technical scheme is as below: the steel plate comprises the following components by weight: no more than 0.15% of C, no more than 0.10% of Si, 0.300.60% of Mn, no more than 0.007% of P, no more than 0.005% of S, 2.00-2.50% Cr, 0.90-1.10% of Mo, no more than 0.02% of Nb, no more than 0.20% of Cu, no more than 0.20% of Ni, no more than 0.003% of Sb, no more than 0.005% of Sn, no more than 0.016% of As, no more than 0.003% of O, N no more than 0.008%, no more than 0.0002% of H, no more than 0.03 of Ti and the balance of Fe and unavoidable impurities; a round steel ingot with piece weight of 80 tons is produced by electric arc furnace smelting and casting; and the steel ingot is subjected to forging cogging, rolling and a heat treatment process including normalizing, accelerated cooling and tempering to prepare the superlarge thickness chromium molybdenum steel plate with a maximum thickness of 256mm for hydrogenation equipment. A finished steel plate has maximum single weight reaching 60 tons, good cold bending property, no cracking during material manufacture and good resilience. The method provided by the invention reduces labor intensity, saves time and improves the utilization rate of materials.

The invention discloses a preparation method and an application of a precious metal-modified CdS nanorod photocatalyst. The photocatalyst consists of precious metal (Pt, Pd or Ru) and nanorod-shaped CdS, and the formation of nanorod-shaped CdS and the depositional modification of precious metal are implemented by a one-pot solvothermal method. The photocatalyst disclosed by the invention has a nanorod-shaped morphology, and can show high-efficient, stable activity in producing hydrogen by decomposing water under visible light when the precious metal content is only 0.06wt.percent. The catalyst preparation process is simple, the required precious metal content is far lower than the precious metal contents of reported products, the catalyst cost is greatly reduced, and the obtained sample has high-efficient, stable activity in producing hydrogen by decomposing water under visible light.

The present invention relates to a process comprising A) providing a microbial fuel cell comprising i) an anode containing one or more electrically conductive materials which is arranged to provide flow paths for electrons through the electrically conductive material, ii) microbes in electrical contact with the anode iii) a cathode containing one or more electrically conductive materials iv) a catholyte, v) a conduit for electrons in contact with both the anode and the cathode which is a part of a circuit; B) introducing a mixture of one or more electrolytes or one or more electrolytes dissolved in a first fluid with a second fluid containing biodegradable material; C) contacting the mixture of B) with the anode in the presence of microbes; D) contacting the cathode with a catholyte; E) removing from the microbial fuel cell the fluid mixture.

The invention discloses a catalyst for treating organic wastewater and a preparation method thereof. The catalyst is a metal carbonyl loaded catalyst, a precursor of the catalyst is one or a combination of ruthenium carbonyl and cobalt carbonyl, a second component Ce or Fe is added at the same time, and a carrier of the catalyst is selected from one or a compound oxide of active carbon, gamma-Al2O3 and TiO2. The catalyst can be used for oxidizing and degrading different organic matters with various concentrations in water under a milder condition so as to greatly reduce COD (Chemical Oxygen Demand) in wastewater and improve the removal efficiency of the COD in the wastewater.

A method and compositions for lubricating surfaces with lubricating oils exhibiting increased phosphorous retention. The lubricated surface includes a lubricant composition containing a base oil of lubricating viscosity, an amount of a phosphorus-containing compound and an amount of at least one hydrocarbon soluble titanium compound that is effective to provide an aged catalyst temperature that converts at least fifty percent of exhaust gas hydrocarbons, carbon monoxide, and NOx that is lower than an aged catalyst temperature that converts at least fifty percent of exhaust gas hydrocarbons, carbon monoxide, and NOx of the lubricant composition devoid of the hydrocarbon soluble titanium compound.

The present invention relates to a metal nanoplate, a method for manufacturing same, and a conductive ink composition and a conductive film comprising metal nanoplate. The metal nanoplate does not require application of a high temperature and high pressure and thus can be easily manufactured at a low temperature and at normal pressure, and a conductive film or a conductive pattern, among others, having excellent conductivity can be formed even when the conductive ink composition comprising the metal nanoplate is printed on a substrate and then heat-treated or dried at a low temperature. As a result, the metal nanoplate and the conductive ink composition comprising same can be very appropriately applied to various semiconductor elements, display devices, or when forming a conductive pattern or a conductive film for a solar cell in an environment requiring low-temperature firing.

Aromatic amines are produced by adiabatic hydrogenation of nitroaromatic compounds in the gas phase on one or more fixed catalysts. The nitroaromatic reactant is passed over the catalyst under pressure and at elevated temperature with hydrogen, water, optionally nitrogen and substantially in the absence of the aromatic amine produced from the nitroaromatic.

The invention provides a method for preparing toluene catalytic combustion monolithic catalysts and application. The toluene catalytic combustion monolithic catalysts are Pd-based catalysts, a carrier for the toluene catalytic combustion monolithic catalysts is CeO2-Pr6O11 / Al2O3, CeO2-Pr6O11 mixed oxide with different Ce / Pr molar ratios is researched, accordingly, the optimal Ce / Pr proportions of the CeO2-Pr6O11 mixed oxide with the highest activity are found, and the toluene catalytic combustion monolithic catalysts are optimal in toluene catalytic oxidation activity when the Ce / Pr proportions are equal to 4:1. The method and the application have the advantages of excellent catalytic performance, low precious-metal content, good thermal stability and uniform coating.

A three-element nano-catalyst for the metallic cellular carrier used to treat the tail gas of car is proportionally prepared from lanthanum oxide, zirconium oxide and cerium oxide through dissolving them in deionized water, adding surfactant, hydrothermal treating, washing, filtering, dispersing it in organic solvent, adding the solution of noble metal, stirring, baking and calcining. Its coating technology includes such steps as ultrasonic cleaning of metallic cellular carrier multiple times, dispersing said nano-catalyst in organic solvent, stirring, baking, coating and calcining.

A lubricant composition for improved phosphorus retention of a used oil and a method for decreasing catalyst deactivation in a catalytic system for an engine exhaust. The lubricant composition is provided by a base oil and an additive composition that contains a phosphorus-containing additive mixture. The phosphorus-containing additive mixture includes an ash-containing phosphorus compound and an ash-free phosphorus compound. A phosphorus retention value provided by the lubricant composition is greater than about 85 percent after oil aging based on an amount of phosphorus initially present in the lubricant composition.

The invention provides a pretreatment method for platinum palladium concentrate. The pretreatment method comprises the following steps: mixing the platinum palladium concentrate, sodium carbonate, sodium hydroxide and sodium chlorate uniformly according to a certain ratio; roasting at certain temperate; transforming impurity elements such as copper, selenium and tellurium into corresponding oxide or corresponding salt; and adding the roasting slag into water according to a certain ratio and leaching, wherein impurities such as copper, selenium and tellurium enter the alkaline leachate, and gold, platinum and palladium are enriched in the alkaline leaching slag. Compared with the traditional pretreatment method for the platinum palladium concentrate, the pretreatment method for the platinum palladium concentrate has the advantages that oxidation roasting and water leaching are adopted, so the noble metal content of the alkaline leachate is low; the leaching rate of the impurities such as copper, selenium and tellurium is high, the copper leaching rate reaches over 95 percent, the selenium leaching rate reaches over 88 percent, and the tellurium leaching rate reaches over 95 percent; the enrichment rate of the noble metal such as gold, platinum and palladium is high, so the extraction treatment on gold, platinum and palladium in the next step is promoted; and equipment is low in corrosivity, safe in operation, good in comprehensive recycling benefit and good in operating environment.

A motor vehicle emission control system includes a three zone catalytic converter component having a honeycomb support body with catalytically active coating having a precious metal content applied on the channel walls. The first coating zone extends in the longitudinal direction from the inlet-side end to a first coating boundary and has a first precious metal content. The second coating zone extends in the longitudinal direction from the first coating boundary to a second coating boundary situated downstream from the first coating boundary and has a second precious metal content that is lower than the first precious metal content. The third coating zone extends from the second coating boundary to the outlet-side end and has a third precious metal content that is lower than the second precious metal content. The coating has oxidation catalyst activity and is free of rhodium.

The present invention relates to an electrode comprising an electrically conductive substrate and a catalytically active layer, wherein the catalytically active layer is based on two catalytically active components and comprises iridium, ruthenium or titanium as metal oxide or mixed oxide or mixtures of the oxides, wherein the total content of ruthenium and / or iridium based on the sum of the elements iridium, ruthenium and titanium is at least 10 mol %, and wherein the electrode comprises at least one oxidic base layer which is applied to the electrically conductive substrate and is impermeable to aqueous electrolytes comprising NaCl and / or NaOH and / or HCl.

The invention provides a carbon monoxide oxidation catalyst and a preparation method thereof. A carrier of the catalyst is attapulgite clay, active components of the catalyst are Cu and Pd, the loading capacity of the Cu is 8-12 wt percent, and the loading capacity of the Pd is 0.2-1 wt percent. The preparation method comprises the steps of: preparing Cu(NO3)2.3H2O, CuCl2.2H2O and PdCl2 in a mol ratio of (2-4):(1-2):(1.5-3) into a solution; and dipping equivalent or excessive solution to the carrier of the attapulgite clay, drying and tabletting to obtain the catalyst. The catalyst has higher catalysis activity, stability and water resistance, and can be used for carrying out effective catalytic oxidation on steam saturated CO under the reaction conditions of normal temperature, space velocity of 2500-10000h<-1> and CO content of 2000-10000ppm, wherein the activity duration of the catalyst is not lower than 120min.

The present invention belongs to the technical field of environmental protection, and in particular relates to a monolithic catalyst for catalytic oxidation of CO at normal temperature and a preparation method thereof. The monolithic catalyst comprises precious metal Pt as an active component, a composite metal oxide as an auxiliary agent coating, and honeycomb ceramic as a carrier; the mass ratio of the precious metal Pt, the composite metal oxide coating and the honeycomb ceramic carrier is 0.01-2:5-20:80-90. The composite metal oxide coating is a mixture of a cobalt-based composite metal oxide, pseudoboehmite and gamma-Al2O3 in a mass ratio of 10-15: 1-5: 1-5. The catalyst prepared by the method has high activity at normal temperature, lowers the energy consumption of CO removal process, has good water and sulfur resistance and stability, can achieve CO effective removal under the conditions of high space velocity, CO concentration and air volume change, and is applicable to normal temperature elimination of CO in all types of combustion tail gases and closed and semi-enclosed places.

A reduced weight enhanced strength jewelry piece. In the preferred embodiment, the piece is comprised of a left section and a right section, each preferably containing a substantially hollow channel. A central section is also provided. All three sections are preferably formed of the same precious metal, though different metals could be used if contrast is desired in the finished piece. In the preferred embodiment, the central section is a substantially solid piece fitted to match both the left section and the right section. The three sections are joined together to form a jewelry piece. The resultant jewelry piece will have two substantially hollow chambers transected by a substantially solid piece. The substantially solid piece will serve as a brace to the hollow chambers, such that if a force were applied to the jewelry piece transverse to the hollow chambers of the piece, the central section would resist deformation.

The invention discloses a thick film resistor slurry, and further provides a thick film resistor slurry with a resistance range of 0.1-10 M[omega] / , and a preparation method thereof. According to thepresent invention, the thick film resistor slurry with the any resistance between the adjacent resistances can be obtained by mixing nine thick film resistor slurries with the adjacent resistances of0.1 [omega] / , 1 [omega] / , 10 [omega] / , 100 [omega] / , 1 k[omega] / , 10 k[omega] / , 100 k[omega] / , 1 M[omega] / and 10 M[omega] / in the range of 0.1 [omega] / to 10 [omega] / , the mixture of the slurries with the adjacent resistances has the good mixing performance, the electrical performance cannot be deteriorated after the mixing, and the resistor slurry obtained by mixing the resistor slurries with the adjacent resistances according to the any ratio does not contain the middle-range transition section so as to greatly reduce the production cost.

The invention discloses a 690 Mpa-grade low-cost high-toughness bainitic steel plate and a production process thereof. The steel plate comprises the following chemical components of, by mass percentage, 0.03-0.09% of C, 0.10-0.30% of Si, 1.50-1.80% of Mn, 0.030-0.070% of Nb, less than or equal to 0.02% of Ti, 0.10-0.40% of Mo, 0.20-0.30% of Ni, less than or equal to 0.045% of Alt, less than or equal to 0.002% of Bt and the balance Fe and inevitable impurities; and the production process comprises the processes of smelting, continuous casting, heating, rolling and heat treatment. The steel plate has the characteristics of low welding crack sensitivity coefficient, low carbon content, low cost and the like, the problems that the carbon content and the carbon equivalent of the tempered steelare high, and the welding performance is poor are solved, and the steel plate can meet the requirements of steel in the fields of engineering machinery, heavy-load bridges, energy-saving vehicles, pipelines, ships, ocean platforms and the like in China.

The invention discloses a nano-porous Al-Ni-M-RE-R amorphous alloy used as a hydrogen evolution catalytic electrode, wherein a transition metal element M is Fe, Co, Cr and Cu, a rare earth element REis Y, La, Gd and Ce, a precious metal R is Pt, Ru, Pd, Rh, Au and Ir, and a hydrogen evolution catalytic electrode comprises the following components in percentage by mass: Al, 2-12% of Ni, 1-13% of M, 2-13% of RE, and 0.2-7% of R, and is treated by adopting a constant current method, a corrosion method or a pulse corrosion current method, so that the prepared nano porous amorphous alloy is stablein structure, large in specific surface area, adjustable in component, structure and morphology and high in catalytic activity. According to the invention, when the nano-porous amorphous alloy hydrogen evolution electrode is used as a water electrolysis hydrogen evolution catalytic electrode, the hydrogen evolution overpotential is 40-65 mV and the Tafel slope is 10-60 mV / dec under the current density of 10 mA.cm<-2>, so that the nano-porous amorphous alloy hydrogen evolution electrode has excellent hydrogen evolution catalytic activity.

The invention relates to a preparation method of a filled composite catalyst for CO gas-phase coupling synthesizing of oxalate and application of the catalyst. The catalyst comprises an aluminum oxideframework, a filled composite carrier which is composed of a filler that fills the framework, an active component Pd which is loaded on the surface of the carrier, and additives Fe and Cu. Compared with the prior art, the catalyst shows outstanding catalyzing performance in the CO gas phase coupling synthesizing of dimethyl oxalate, and the catalyst has the advantages of being low in noble metalPd content, high in utilization rate, and low in cost.

A ceramic material used for X7R-model multi-layer ceramic capacitor with medium or low sinter temp and high temp stability is prepared from barium titanate and the additive chosen from cobalt oxide and niobium oxide, or their compound, yttrium oxide, RE oxide, Ag, zinc oxdie and boron oxide, or their compound. It has dielectric constant of 1800-5600, capacitance-temp variation rate less than + / -15%, and sinter temp of 900-1150 deg.C.

The invention discloses multiphase reinforced ultrahigh-strength maraging stainless steel and a preparation method thereof. The multiphase reinforced ultrahigh-strength maraging stainless steel is prepared from the following components in percentage by mass: 1.0 to 5.0 percent of Co, 6.0 to 10.0 percent of Ni, 11.0 to 17.0 percent of Cr, 0.3 to 2.0 percent of Ti, 3.0 to 7.0 percent of Mo, 0.08 to 1.0 percent of Mn, 0.08 to 0.5 percent of Si, less than or equal to 0.02 percent of C, less than or equal to 0.003 percent of P, less than or equal to 0.003 percent of S and the balance of Fe. The preparation method comprises the following steps: (1) proportioning alloy elements; (2) carrying out vacuum smelting on an electrode in a vacuum induction smelting furnace; (3) carrying out vacuum consumable remelting; (4) carrying out high-temperature fire homogenizing treatment; (5) carrying out forging or hot rolling cogging; (6) carrying out cold rolling deformation; and (7) carrying out heat treatment. According to the multiphase reinforced ultrahigh-strength maraging stainless steel and the preparation method, a precipitation phase and inverted austenite are uniformly and finely distributed, and the partition efficiency of the inverted austenite forming elements is higher.

The invention discloses a tightly-coupled exhaust manifold assembly which comprises an exhaust manifold component and a three-way catalytic converter conducted and coupled with the exhaust manifold component. The three-way catalytic converter and the exhaust manifold component are connected through a clamshell. The exhaust manifold component comprises a first manifold, a second manifold, a third manifold and a third manifold with front ends mounted on an air inlet flange and arranged from one side to the other side sequentially. The tail ends of the first and second manifolds extend into the front end of a first convergence pipeline, the tails of the third and fourth manifolds extend into the front end of a second convergence pipeline, the tail ends of the first and second convergence pipelines extend into the clamshell, the tail end of the clamshell is connected with the three-way catalytic converter, and the bottom of the three-way catalytic converter is connected with the air inlet flange. The tightly-coupled exhaust manifold assembly is simple in structure and light in weight, number of parts is reduced, oil consumption and production cost are lowered, the temperature of the three-way catalytic converter is increased, airflow interference is avoided and engine performance is improved.

The invention relates to a preparation method of an ordered anode catalyst layer of a PEM water electrolysis membrane electrode. A catalyst layer array provided by the invention is of a double-layer structure, a transition metal oxide array serves as a catalyst layer carrier, and a catalyst wraps the surface layer of the array. The catalyst layer has the characteristics of an ordered structure, a low noble metal catalyst loading amount and high-current-density stable operation. Specifically, a hydrothermal method is adopted to prepare a non-noble metal oxide which serves as an array carrier, a thin catalyst shell is prepared on the surface of the array through an electro-deposition technology, and an ordered oxygen evolution electrode is obtained. The membrane electrode catalyst layer has the advantages of simple and reliable preparation method and uniform structure. The prepared catalyst layer can be used for preparing a PEMWE (proton exchange membrane water electrolysis) membrane electrode, and low-cost, efficient and stable operation of PEM water electrolysis hydrogen production is realized.

The invention relates to a method for recovering platinum group metal from ferrous nickel electrolysis anolyte, which comprises the following steps of: firstly neutralizing the nickel electrolysis anolyte to remove iron; returning the filtrate to a production system; performing acid dissolution on the obtained primary iron slag at 20-50 DEG C, and then adding a vulcanizing agent; performing precision filtering, wherein over 96% of precious metal is enriched in the filter residue; and removing iron of the filtrate by a sodium jarosite method, wherein the content of precious metal in the obtained sodium jarosite slag is less than 1.0g / t. The method provided by the invention solves the problem that precious metal is lost in anolyte and hard to recover in an electrolytic refining process of a nickel anode containing precious metal, prevents influence on the existing production, and can guarantee the quality of electrolytic nickel; and moreover, the technology is simple, the production cost is low, and the implementation is easy.