156 results about "Praseodymium" patented technology

The invention discloses a neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and a preparation method thereof, and relates to the technical field of neodymium-iron-boron magnet preparation, and the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet comprises the following preparation raw materials: 170-175 kg of PrNd (praseodymium-neodymium alloy), 25-30 kg of BFe (iron white copper), 1-5 kg of Co (cobalt), 0.1-2 kg of Cu (copper), 1-5 kg of Zr (zirconium), 0.1-1 kg of Ga (gallium) and 380-420 kg of Fe (iron). According to the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and the preparation method thereof, the 54H sintered neodymium-iron-boron magnet is prepared through a double-alloy technology with neodymium, iron and gallium as auxiliary alloy without adding dysprosium, terbium and other scarce type heavy rare earth elements, and performance optimization and cost optimization of the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet are achieved.

The invention relates to the technical field of neodymium-iron-boron magnet production, in particular to a sintered neodymium-iron-boron magnet for preparing lanthanum-cerium-yttrium and a method of the sintered neodymium-iron-boron magnet. In the invention, the cerium element is used for replacing a praseodymium-neodymium alloy, meanwhile, the lanthanum and yttrium elements are introduced according to the proportion to generate a synergistic effect to regulate and control the structure of the high-cerium-content sintered neodymium-iron-boron magnet, the yttrium element is used for inhibiting main phase grain coarsening and improving the coercive force, and the lanthanum and yttrium elements can promote the flow of a rare earth-rich liquid phase in the sintering process and improve the diffusivity, so that the high-cerium-content sintered neodymium-iron-boron magnet is obtained. The density is improved.

The invention discloses a preparation method of a sintered neodymium-iron-boron magnet without heavy rare earth, Pr-Fe-B-M alloy is used as an auxiliary phase alloy, LRe-Fe-B-M alloy is used as a main phase alloy, the auxiliary phase alloy is used for preparing a magnet matrix and performing grain boundary diffusion at the same time, the magnet without heavy rare earth is prepared, praseodymium element is non-uniformly distributed in the magnet, and rare earth element is not uniformly distributed in the magnet. The Pr content of part of the main phase is higher than the overall average content, the crystal boundary praseodymium content is higher than the overall average content, and the magnet surface praseodymium content is higher than the overall average content. The coercive force and the temperature stability of the magnet are improved, the magnet can still keep excellent magnetic performance under the condition that Dy and Tb are not contained, heavy rare earth elements such as Dy and Tb which are scarce in resource and high in price are prevented from being used, the high performance of the magnet is guaranteed, the production cost is reduced, and the resource utilization efficiency is improved.

The present application relates to a kind of spheroidal doped ceria and its preparation method and application, the preparation method includes the following steps: after cerium salt, doped metal salt, solvent, acidic reagent and precipitant are mixed, hydrothermal reaction is carried out, and the precipitate is obtained, the precipitate is calcined, and the spheroidal doped ceria of the present application is obtained;The doped metal salt includes praseodymium salt and / or neodymium salt.The present application uses cerium salt and praseodymium salt and / or neodymium salt as doped metal salt as raw material, by the design of mixing process and reaction procedure and the selection of preparation process, the preparation of spheroidal doped ceria is realized, the doped ceria of nanometer level particle is obtained, and its appearance is regular and particle size is uniform, and, the preparation method used in the present application is simple, reaction time is short, and can be used for mass production.

The present application relates to the technical field of extracting rare earth, and particularly relates to an extraction rare earth separation process method. Fluorine-carbon cerium ore crude ore is treated to obtain activated ore powder. The activated ore powder is subjected to alkali pressure boiling oxidation, roasting transformation and optimal dissolution leaching to obtain a purified liquid. The purified liquid is then subjected to barium chloride sulfuric acid removal, lead removal by sulfurized lead, pH adjustment and the like to obtain a low-impurity chlorinated rare earth liquid. The chlorinated rare earth liquid is subjected to multi-stage extraction to obtain a neodymium chloride solution, a praseodymium-neodymium chloride solution and a lanthanum-cerium chloride solution. The solutions are subjected to oxalic acid precipitation and calcination to obtain a rare earth oxide product. The present application adopts fine pretreatment, multi-stage differential extraction and purification processes to achieve efficient separation of lanthanum-cerium, praseodymium-neodymium and neodymium in fluorine-carbon cerium ore and improve product purity.

The application relates to the technical field of fluorine-containing wastewater treatment equipment, and discloses a fluorine-containing wastewater treatment device for praseodymium neodymium fluoride rare earth processing, which comprises a wastewater treatment tank, the top of the wastewater treatment tank is provided with a water inlet valve; a filtering and cleaning device comprises a water conveying pipeline vertically penetrating through the middle part of the top end of the wastewater treatment tank, the top end of the water conveying pipeline is communicated with the water inlet valve, the bottom of the water conveying pipeline is circular, uniform and horizontally provided with a plurality of water filtering channels, the bottom of each water filtering channel and the side far away from a water receiving disc are provided in an open mode, the bottom of the water filtering channel is covered with a first filter membrane, and the side far away from the water receiving disc of the water filtering channel is covered with a second filter membrane; when fluorine ions in fluorine-containing wastewater are separated and filtered through a filter membrane assembly, the filter time is effectively prolonged, the separation effect of the fluorine ions is improved, the surface of the filter membrane assembly is cleaned, and the effect of rare earth impurities on the membrane holes of the filter membrane is avoided.

The application relates to the field of alloy defect detection, and specifically discloses a praseodymium-neodymium alloy nondestructive detection method and system based on acoustic feature analysis, which comprehensively captures defect information contained in an original probe signal from two complementary physical perspectives of instantaneous dynamic characteristics and frequency band energy distribution by simultaneously adopting Hilbert-Huang transform and wavelet packet transform. Further, the scheme discards simple feature splicing, and instead utilizes canonical correlation analysis as an information decoupling tool to online decompose two groups of original feature vectors into a shared part describing defect commonality and unique information parts respectively representing the unique resolution capabilities of HHT and wavelet packet. Finally, the three decoupled components are structurally recombined to form a fusion feature vector which can effectively eliminate redundancy, amplify differences and has higher information density, thereby providing a clear structure and highly refined input for a subsequent classification model.

A dielectric ceramic composition includes a barium titanate (BaTiO3)-based base material main ingredient and an accessory ingredient, the accessory ingredient including dysprosium (Dy) and praseodymium (Pr) as first accessory ingredients. A content of the Pr satisfies 0.233 mol≤Pr≤0.699 mol, based on 100 mol of the barium titanate base material main ingredient.

The invention relates to a microbial growth activation accelerant based on rare earth elements as well as a preparation method and application thereof, and belongs to the field of resources and environments. The microbial growth activation accelerant based on the rare earth elements is prepared from the following components: 1 to 150g of a rare earth compound, 0.2 to 2g of pantothenic acid, 0.2 to 2g of nicotinic acid, 0.02 to 0.1 g of nicotinamide and 1000g of deionized water, the rare earth compound is one or combination of more of chlorides of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium, nitric acid compounds and sulfuric acid compounds. A large number of cheap light rare earth elements are used as raw materials of the microbial accelerator, a new utilization approach is provided for the light rare earth elements, the light rare earth elements are converted into high-added-value products, pollution of the light rare earth elements to the environment is reduced, and meanwhile new elements are introduced into the field of microbial accelerators. More importantly, the preparation method of the microbial growth activation accelerant based on the rare earth elements provided by the invention is simple in production process and convenient for large-scale production.

An optical signal amplifier using a praseodymium doped fiber is described. The optical signal amplifier includes a signal laser, a first optical isolator, a second optical isolator a pump laser, a wave division multiplexer, a silica based glass optical fiber, a second optical isolator, an optical power meter, and an optical spectrum analyzer (OSA). The signal laser generates a signal laser beam. The pump laser generates a pumped laser beam. The wave division multiplexer combines the signal laser beam and the pumped laser beam and generates a combined laser beam. The silica based glass optical fiber has a preferred concentration of praseodymium ions of about 50×1024 ions / m3 and a length of about 5.7 m. The silica based glass optical fiber receives the combined laser beam, amplifies photons in the combined laser beam, and generates an amplified laser beam.

The utility model provides a praseodymium neodymium oxide preparation stock solution firing device, which belongs to the technical field of praseodymium neodymium oxide preparation, and comprises a conveyor belt and a firing furnace, the front surface of the conveyor belt is fixedly connected with the firing furnace, the back surface of the firing furnace is connected with a baffle plate in an embedded manner, the top of the firing furnace is fixedly connected with a servo screw rod, and the servo screw rod is fixedly connected with a motor. The output end of the servo lead screw is fixedly connected with a transmission plate, and the inner side of the firing furnace is fixedly connected with an electric heating pipe. The ventilating fan, the water tank, the conveying pump and the output head are additionally arranged through the fixing frame, the ventilating fan conveys air to the outer surface of the container, the air flow speed of the surface of the container is increased, primary cooling is conducted on stock solution in the container, meanwhile, the conveying pump generates suction force on water in the water tank, and the water is conveyed into the output head; at the moment, the output head atomizes and conveys the water to the outer surface of the container, and further cooling of the stock solution and the container is completed.

The invention relates to a novel functional material for X-ray protection, in particular to a liquid metal flexible shielding material and a preparation method and application thereof. The material comprises liquid metal and solid metal, the liquid metal serves as a solvent to be filled in gaps of the solid metal, the liquid metal is gallium, gallium indium, gallium indium tin, gallium indium tin zinc or mercury, and the solid metal is selected from one or more of indium, tin, gold, platinum, iridium, zirconium, niobium, molybdenum, ruthenium, osmium, rhenium, rhodium, tungsten, antimony, palladium, tantalum, hafnium, lutetium, lead, ytterbium, thulium, bismuth, silver, erbium, holmium, dysprosium, terbium, gadolinium, samarium, neodymium, lanthanum, praseodymium, cerium and europium. On the basis of compounding of the liquid metal solvent and the solid metal solute based on the liquid metal combinatology, the liquid metal and the solid metal are jointly used for protecting X-ray radiation, the comprehensive performance of X-ray protection is improved, and meanwhile the variety and number range of selectable metal elements is widened.

The invention discloses a praseodymium neodymium cutting and shredding machine and a cutting method thereof. The praseodymium neodymium cutting and shredding machine comprises a feeding mechanism used for conveying praseodymium neodymium blocks to be cut; the blanking mechanism is arranged below the feeding mechanism, and praseodymium neodymium blocks to be cut are conveyed to the blanking mechanism through the feeding mechanism; the cutting mechanism is arranged below the blanking mechanism, and a praseodymium neodymium block to be cut is cut into a small praseodymium neodymium block after passing through the cutting mechanism; the shredding mechanism is arranged below the cutting mechanism, and praseodymium neodymium blocks cut by the cutting mechanism are shredded into qualified sizes through the shredding mechanism; the cleaning mechanism is arranged at the shredding mechanism and can clean out praseodymium neodymium blocks which are clamped in the shredding mechanism and shredded into qualified sizes by the shredding mechanism; the discharging mechanism is arranged below the shredding mechanism, and praseodymium and neodymium blocks shredded by the shredding mechanism fall onto a discharging conveying belt of the discharging mechanism and are conveyed to the next link. Therefore, it can be guaranteed that the cutting size is accurate, the cutting efficiency is high, and labor is saved.

This invention relates to the field of denitrification catalyst technology, and in particular to an arsenic- and alkali-poisoning-resistant denitrification catalyst and its preparation method. The denitrification catalyst comprises: a support, an active component, and a co-catalyst; the mass ratio of the active component to the support is (3-15):100; the mass ratio of the co-catalyst to the support is (3-8):100; the support comprises: calcium-based bentonite, attapulgite, and nano-cerium oxide; the active component is an oxide of vanadium, chromium, samarium, or niobium; and the co-catalyst is one or more oxides of molybdenum, tungsten, or praseodymium. This invention prepares a multi-component mesoporous composite oxide denitrification catalyst with excellent resistance to arsenic and alkali metal poisoning through multiple steps, solving the problem of poor arsenic and alkali resistance in traditional denitrification catalysts. It is suitable for nitrogen oxide emission control under flue gas conditions in coal-fired power plants, biomass boilers, and the glass industry.

The invention belongs to the technical field of catalysts, and particularly relates to a micron-sized macroporous cerium-zirconium-praseodymium composite material as well as a preparation method and application thereof. According to the preparation method, the micron-sized macroporous CeO2-ZrO2-PrO2 composite material is constructed by using the starch which is low in price and wide in source as a template agent under an industrial coprecipitation process, and the micron-sized macroporous CeO2-ZrO2-PrO2 composite material is used as a catalyst, so that the contact efficiency between the catalyst and soot particles can be improved, and the performance of the catalyst for purifying the soot particles in the tail gas of the diesel engine is further improved.

The invention relates to heat storage ceramic with high silicon blockage resistance and a preparation process of the heat storage ceramic. The heat storage ceramic comprises a ceramic matrix and lanthanum-praseodymium-titanium modified liquid for dipping the ceramic matrix, the preparation raw materials of the ceramic matrix comprise the following components in parts by weight: 35-45 parts of kaolin, 20-30 parts of alumina powder, 10-14 parts of silicon carbide powder and 5-8 parts of a fluxing agent; the lanthanum-praseodymium-titanium modified liquid is prepared from the following raw materials: lanthanum nitrate, praseodymium nitrate, nano titanium dioxide sol and water. The heat storage ceramic is low in initial adhesion silicon content, easy to clean and gt in crusting stripping rate; and the silicon plugging resistance is good.

The compositions disclosed herein are compositions having a mixed oxide core consisting of alumina-free cerium oxide and zirconium oxide. The mixed oxide core contains, based on its total weight, about 15% to about 60% by weight of cerium oxide and about 40% to about 85% by weight of zirconium oxide. The mixed oxide core has a rare earth oxide coating on its surface, the rare earth oxide being selected from the group consisting of cerium, lanthanum, neodymium, praseodymium, yttrium and mixtures thereof. Furthermore, noble metals such as palladium or rhodium are dispersed on the surface of these compositions, and the dispersion of rhodium or palladium is higher compared to compositions containing a mixed oxide core without a rare earth oxide coating. Furthermore, methods for producing these compositions are also disclosed herein. These compositions can be used as part of a catalyst system.

The present invention provides defect-controlled fluoride crystals, a method for producing the same, and the use thereof. These fluoride crystals contain at least a rare earth element RE (RE is at least one element selected from the group consisting of cerium (Ce), praseodymium (Pr), lanthanum (La), and neodymium (Nd)), fluorine (F), and hydrogen (H), and have the same crystal structure as crystals represented by CeF3. A method for producing fluoride crystals according to the present invention comprises growing crystals from a raw material containing a rare earth element RE and a raw material containing fluorine (F) by a solvothermal method in the presence of at least one mineralizer selected from the group consisting of mineralizers containing an alkali metal element and / or an alkaline earth metal element, acid mineralizers, and mineralizers containing a normal salt.

The application relates to a grain refinement and ignition performance synergic optimization preparation method of a rare earth ignition alloy, and belongs to the technical field of rare earth ignition alloy manufacturing. According to percentages, the preparation raw material of the blank includes 35-45% of lanthanum, 15-30% of cerium, 5-15% of tin, 5-10% of zinc, 5-10% of praseodymium, 1-5% of neodymium and 15-25% of iron. The synergic action of the nanoscale active metal additive and the blank enables the rare earth ignition alloy to generate continuous sparks under slight friction or impact, and improves the ignition performance of the traditional rare earth ignition alloy.

This invention provides a functional cyanide-free silver plating method and coating structure, belonging to the field of metal surface treatment technology. This invention adds a trivalent chromium plating layer between the cyanide-free copper plating layer and the cyanide-free silver plating layer prepared by existing technology. The trivalent chromium plating layer provides electrochemical protection to the underlying copper plating layer, and the resulting coating structure effectively prevents corrosive media from eroding towards the substrate. The trivalent chromium plating layer has excellent corrosion resistance, effectively resisting corrosion from corrosive media, overcoming the defect of copper rust easily appearing on the surface of parts plated directly on copper plating layers. Simultaneously, by controlling the composition of the plating solution and adding lanthanum chloride heptahydrate and praseodymium chloride heptahydrate, the two have a synergistic effect, further improving the corrosion resistance of the plated parts.

The invention discloses a neodymium-iron-boron magnet and a preparation method thereof. The neodymium-iron-boron magnet is a sintered magnet obtained by modifying an alloy fine powder raw material through a chemical reagent and then carrying out compression, vacuum treatment and sintering; the alloy fine powder comprises 75 wt%-99 wt% of magnetic powder and 1 wt%-25 wt% of metal fine powder, and the metal fine powder is one or more of lanthanum, cerium, praseodymium, neodymium, iron, aluminum, cobalt, copper and titanium. The preparation method comprises the steps of magnetic powder and metal powder mixing, chemical reagent modification treatment, heat treatment, compression molding, sintering and heat treatment, and the neodymium-iron-boron magnet is obtained. A chemical reagent is used for modifying the magnet, so that the microstructure of the magnet is improved, the interaction effect of a main phase and a grain boundary phase of a magnet base material is improved, grain boundary phase distribution is further optimized through grain boundary diffusion, the comprehensive magnetic performance of the magnet is improved, the use amount of heavy rare earth is reduced, and the bottleneck of high-performance magnet preparation is broken through.

Olefin compounds can be produced by a method that can include passing a feed stream into a reactor, where the feed stream includes one or more hydrocarbons; and passing an oxygen carrier material into the reactor. In the reactor, the one or more hydrocarbons can be dehydrogenated to form hydrogen gas and one or more olefin compounds, and at least a portion of the hydrogen gas can react with oxygen gas from the oxygen carrier material to produce water. At least 95 wt% of the oxygen carrier material can consist of: 1 mole fraction of iron; 0 mole fraction to 1 mole fraction of a combination of one or more of strontium, calcium, magnesium, titanium, lanthanum, cerium, praseodymium, neodymium, samarium, or yttrium; 1 mole fraction to 20 mole fraction of silicon dioxide; and 1 mole fraction to 3 mole fraction of oxygen gas not included in the silicon dioxide.

The invention belongs to the technical field of rare earth permanent magnet materials, and particularly discloses a neodymium-iron-boron magnet without heavy rare earth and a preparation method of the neodymium-iron-boron magnet. The neodymium-iron-boron magnet comprises main-phase neodymium-iron-boron coarse powder and auxiliary-phase praseodymium-titanium-aluminum coarse powder, wherein the auxiliary-phase praseodymium-titanium-aluminum coarse powder accounts for 0.5-3.5 wt% of the main-phase neodymium-iron-boron coarse powder; the main phase comprises the following components in percentage by weight: 29.5 to 32.5 percent of PrNd; 0.88 to 1 wt% of B; 0 to 0.3 wt% of Al; 0.1 to 0.4 wt% of Cu; 0 to 0.2 wt% of Ti; 0.1 to 0.4 wt% of Zr; ga is 0.2 to 0.6 wt%; 0.5 to 1.8 wt% of Co; and the balance of Fe. The auxiliary phase comprises the following components: 75-85 wt% of Pr; 5 to 10 weight percent of Ti; and 10 to 15 wt% of Al. The neodymium-iron-boron magnet has the advantages of being free of heavy rare earth, high in magnetic performance, excellent in mechanical performance, simple in process, suitable for mass production and the like.

The application relates to a Mo-Pr liquid catalyst for hydrogen conversion of a biomass raw material, which comprises the following raw materials: a molybdate, praseodymium nitrate and an organic ligand, wherein the molar ratio of Mo in the molybdate to Pr in the praseodymium nitrate is (5-15):1. The conversion rate of the catalyst for hydrogen conversion of the biomass raw material is greater than 92%, the cetane number is greater than 65, the condensation point is less than -22 DEG C, the sulfur content is less than 10 ppm, and the cycle number of the catalyst is greater than 20 times.

The preparation method comprises the following steps: ball-milling and mixing a praseodymium source, a zirconium source and a silicon source to obtain rare earth composite precursor gel; the rare earth composite precursor gel is dried, and rare earth composite precursor xerogel is obtained; crushing and tabletting the rare earth composite precursor xerogel, and performing Joule thermal sintering to obtain a rare earth pigment sintered sheet; the rare earth pigment sintered sheet is ground to obtain the rare earth pigment, and the rare earth pigment is yellow. The rare earth pigment is prepared by adopting a Joule heat rapid sintering method, so that extremely short-time heating and rapid cooling can be realized, controllable and adjustable temperature distribution is allowed, rapid reaction sintering of a rare earth material is realized, the reaction process is sufficient, the sintering process and the microstructure of the material can be accurately controlled, and the method has the advantages of simple process, short preparation period, low cost and the like. And the prepared pigment has the characteristics of bright color, heat-resistant stability and excellent near-infrared reflection performance.

The invention relates to the technical field of magnetic functional materials, in particular to a light rare earth Pr-based ultrahigh magnetostrictive material and a preparation method thereof. The light rare earth Pr-based ultrahigh magnetostrictive material comprises the following raw materials in parts by weight: 20-35 parts of praseodymium-neodymium misch metal, 60-75 parts of pure iron, 3-8 parts of metal cobalt, 0.5-2 parts of metal niobium, 0.1-0.5 part of an additive A and 0.5-2 parts of an additive B. The additive A is enriched at a grain boundary; the additive B is used for improving the combination state between the rare earth phase and the ferromagnetic matrix, the directional rotation process of the magnetic domain under the external magnetic field is promoted, and the magnetic field is improved. The effects are combined with the inherent strong magnetocrystalline anisotropy of the Pr element and specific hydrogen decrepitation and magnetic field orientation hot pressing processes, and the magnetostriction strain and driving capacity of the material are synergistically enhanced.

The application relates to the technical field of tungsten alloy materials, in particular to a tungsten alloy wire, a preparation method thereof and application of the tungsten alloy wire in semiconductor material cutting, wherein the tungsten alloy is composed of the following mass fractions of elements: L 0.4-1.1 wt%, Z 0.001-0.25 wt%, and the balance is tungsten and inevitable impurities; wherein L is at least one of lanthanum, cerium, praseodymium, neodymium, gadolinium and erbium; Z includes oxygen and boron; the wire diameter of the wire is 20-60 mu m; in the wire, there is linear L or a compound of L along the wire axis direction, and the radial average width D of the L or the compound of L is less than or equal to 5 nm. According to the application, the linear L element is doped between tungsten matrices, and the radial average width of the L is controlled to be less than or equal to 5 nm, so that the wire has a tensile strength of more than 5000 MPa under the wire diameter of 20-60 mu m, and the processing performance of the tungsten alloy wire is enhanced.

This invention provides an electronic-grade glass fiber composition and its glass fiber cloth, relating to the field of glass fiber technology. The electronic-grade glass fiber composition comprises: alumina, silicon oxide, magnesium oxide, calcium oxide, barium oxide, additives, and fillers; the mass ratio of alumina, barium oxide, and additives is (20-40):(2-8):(2-5); the additives are metal A and metal B in a mass ratio of (1-5):(1-5); metal A includes at least one selected from titanium, vanadium, chromium, manganese, iron, cobalt, and nickel. Metal B includes at least one selected from lanthanum, cerium, praseodymium, scandium, and yttrium. The electronic glass fiber cloth prepared from the electronic-grade glass fiber composition of this invention has high tensile strength and low moisture regain during long-term storage.

The invention belongs to the technical field of ceramics, and relates to an AlN composite ceramic with a high-temperature wetting phase as well as a preparation method and application of the AlN composite ceramic. The preparation method of the AlN composite ceramic comprises the following steps: carrying out ball-milling mixing on AlN, an additive and praseodymium oxide, then drying, sieving, and carrying out dry pressing and isostatic pressing to obtain an AlN green body; the AlN green body is subjected to debonding treatment, and an AlN prefabricated body is obtained; carrying out high-temperature reaction on the AlN preform in an inert atmosphere to obtain a high-temperature wetting phase; and further raising the temperature to sinter and densify to obtain the AlN composite ceramic. The AlN ceramic device is prepared from praseodymium oxide, so that a high-temperature wetting phase uniformly-distributed three-dimensional network structure can be formed in the ceramic, and the mechanical property of the AlN ceramic is improved while the sintering densification of the AlN ceramic is promoted.

The invention concerns an electrode for gas evolution in electrochemical processes and a method for its preparation, the electrode comprising a metal substrate provided with a single catalytic coating layer, wherein said catalytic coating layer consists essentially of a rare earth metal selected from praseodymium, cerium and lanthanum and noble metals selected from platinum and palladium, wherein the rare earth metal and the noble metals are present in a form of metals or oxides thereof, wherein said rare earth metal is present in an amount comprised between 20 and 80 wt.% of the total amount of metals in said catalytic coating layer, wherein said noble metals are present in an amount comprised between 20 and 80 wt.% of the total amount of metals in said catalytic coating layer, wherein said platinum is present in an amount comprised between 10 and 70 wt.% of the total amount of metals in said catalytic coating layer, wherein said palladium is present in an amount comprised between 10 and 70 wt.% of the total amount of metals in said catalytic coating, and wherein the catalytic coating layer has a total noble metal load comprised between 1 and 6 g / m2.