111results about How to "Low precious metal content" patented technology

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 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.

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 NO_x that is lower than an aged catalyst temperature that converts at least fifty percent of exhaust gas hydrocarbons, carbon monoxide, and NO_x 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.

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.

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 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.