40 results about "Sodium tetrachloropalladate" patented technology

A functionalized graphene supported nickel palladium bi-metal nanometer catalyst, and preparation and applications of the catalyst are provided. A preparation method does not include a high-temperature hydrothermal reaction or a step of adding other catalysts, and only includes adding nickel chloride (NiCl2) and sodium tetrachloropalladate (Na2PdCl4) which are metal precursors into a mixed solution of 3-aminopropyl-3-ethoxysilane (APTS) and graphite oxide (GO), rapidly reducing Ni<2+> and Pd<2+> ions into NiPd metal particles by utilizing sodium borohydride (NaBH4) and allowing the metal particles to grow on a -NH2-functionalized graphene substrate (NiPd/N-FG). The prepared nickel palladium metal nanometer particles are uniformly distributed on the substrate and have a very small particle size (1.2-2.4 nm). The synthesized Ni<0.4>Pd<0.6>/N-FG catalyst still has extremely good catalytic performance when the content of the non-noble metal Ni accounts for 40% of the total metal content. The method is simple, effective and low in cost, overcomes problems such as long synthesis time, high synthesis temperatures, and high nanometer particle sizes, and promotes practical application of formic acid as a hydrogen storage material in fuel cells and vehicle-mounted mobile hydrogen source materials.

The invention relates to a Pd @MIL-101 composite and a preparation method and application thereof. According to the adopted technical scheme, palladium chloride is added to methyl alcohol while sodium chloride is added, ultrasonic dispersion is conducted, stirring is conducted for 10-20 hours, and sodium tetrachloropalladate is obtained; a sodium tetrachloropalladate solution is dropwise added into MIL-101 crystals slowly, pd<2+>@MIL-101 is obtained; a methanol solution of asaturated sodium borohydride is added to the pd<2+>@MIL-101, reduction is conducted under the condition of ice-water bath, and the Pd @MIL-101 composite is obtained. The synthesized Pd @MIL-101 composite has special selectivity catalytic activity for phenylboronic acid and 1,4-dibromo-benzene in a suzuki reaction, and the yield of an intermediate product 4-bromobiphenyl is effectively raised.

The invention discloses a palladium-doped stannic oxide wrapped carbon nano tube which is prepared by using a gel-sol method. The carbon nano tube is structurally prepared by wrapping the surface of the carbon nano tube with palladium-doped stannic oxide crystal (Pd/SnO2), and the method comprises the following steps: dispersing the carbon nano tube into super-pure water in an ultrasonic mode, adding a stannic chlori precursor, dispersing in the ultrasonic mode again, subsequently adding a sodium tetrachloropalladate solution, uniformly stirring, mixing, adjusting the pH value to be 7-9, preserving for 0.2-36 hours at 30-200 DEG C so as to obtain milk white gel, washing and drying the gel, subsequently calcining at 200-700 DEG C so as to prepare the palladium-doped stannic oxide wrapped carbon nano tube. Due to adoption of noble metal and doping of the carbon nano tube, the gas-sensitive property of a stannic oxide-based gas sensor is greatly improved, the response and recovery time is shortened, and the low operation temperature is optimal.

The invention discloses palladium nano-particles with peroxidase activity and a preparation method thereof. The preparation method includes the following steps that (1) annealing of deoxynucleotide is conducted, specifically, a deoxynucleotide aqueous solution and a phosphate buffered solution are added into a 1.5 mL centrifuge tube and mixed evenly, and the temperature is increased to 90-100 DEG C, maintained for 5-10 min, and decreased to the room temperature; and (2) the nano-particles are prepared, specifically, a sodium tetrachloropalladate aqueous solution is added to the annealed deoxynucleotide aqueous solution obtained in the step (1), the mixture is mixed evenly and stands, a reducing agent aqueous solution is added, the mixture is mixed evenly and stands, and liquid of the palladium nano-particles with peroxidase activity is obtained. The method disclosed by the invention is simple, the period is short, conditions are easy to control and mild, and large-scale industrial production and preparation are facilitated. The mean grain size of the nano-particles with peroxidase activity is 1.0-4.8 nm, and the nano-particles with peroxidase activity is high in catalytic activity.

The invention relates to a mesoporous platinum-palladium bimetallic nanoparticle and a preparation method thereof. The particle size of the mesoporous platinum-palladium bimetallic nanoparticle is 30-100nm, and the surface of the nanoparticle has a porous structure whose aperture is uniform, and the aperture is 2-3nm. The preparation method is as follows: (1) sodium tetrachloropalladate, chloroplatinic acid and a surfactant are dissolved in water, the materials are stirred uniformly at 30-90 DEG C, and a mixed solution containing bimetal is obtained; (2) a reducing agent solution is added into the mixed solution containing bimetal obtained in the step (1), a reaction is continued to carry out for 2-5 hours, an obtained reaction solution is centrifugal and separated, and the mesoporous platinum-palladium bimetallic nanoparticle is obtained by post-treatment. The invention provides a simple method for synthesis of the mesoporous precious metal nanoparticle with simple process and short synthesis period; the synthesized mesoporous precious metal nanoparticle is used as a catalyst for an industrial nitrobenzene hydrogenation reaction with very high activity.

The invention provides a preparation method of a palladium-copper bimetallic nanoflower peroxide. The preparation method comprises the following steps: adding sodium tetrachloropalladate, tungsten hexacarbonyl, copper chloride dihydrate, dimethylformamide and glacial acetic acid to a round-bottom flask; ultrasonically and uniformly mixing the above solutions, and then heating and stirring the uniformly mixed solutions through an oil bath; and finally, centrifugally washing the obtained product by using water and ethanol for serval times, so as to obtain a bimetallic alloy nanomaterial, namelyPdCu nanoflower. The preparation process of the palladium-copper bimetallic nanoflower peroxide is simple and the yield is high; and through the prepared unique two-dimensional structure, the reactionrate is promoted and the detection time is saved. The invention further discloses the application of the palladium-copper bimetallic nanoflower peroxide to glucose detection. Through such a detectionmethod, the sensitivity and the selective detection of glucose can be achieved.

The invention discloses a palladium-copper gold nanometer spinous oxygen reduction catalyst and a preparation method thereof. The preparation method comprises the following steps: respectively preparing a sodium tetrachloropalladate solution, a copper chloride solution and a chloroauric acid solution which have the concentration of 1 to 30 mM, a hydrochloric acid solution with the concentration of1 to 10 M and an ascorbic acid solution with the concentration of 0.01 to 0.5 M; mixing the sodium tetrachloropalladate solution, the copper chloride solution and the chloroauric acid solution of which the total volume is 4.5 mL, then adding 0.1 to 0.5 mL of the prepared hydrochloric acid solution, adding 0.1 to 0.5 g of potassium bromide and F127, and mixing uniformly; finally adding 1 to 10 mLof the ascorbic acid solution; after the solutions are fully mixed, placing the mixture in an oil bath pan, heating to 70 to 130 DEG C, reacting for 0.1 to 3 hours, and performing washing, centrifuging and drying to obtain the palladium-copper gold nanometer spinous electrocatalyst. The preparation method has the advantages of simple preparation process, and short reaction time. The material prepared at normal temperature and under normal pressure has superior electrochemical oxidation reduction performance.

The invention discloses a preparation method of a polypyrrole/palladium-cellulose paper base catalyst for catalyzing the ammonia borane dehydrogenation and relates to a preparation method of a catalyst for efficiently catalyzing the ammonia borane dehydrogenation. The method aims at solving the problems that an existing macromolecule ground material supported catalyst is low in catalyzing efficiency and poor in stability. The preparation method comprises the steps that 1, cellulose paper is submerged in deionized water, a pyrrole monomer is added, and mixing liquid is obtained; 2, a sodium tetrachloropalladate solution is added into the mixing liquid, the liquid is shocked 18-24 hours, and reaction liquid comprising polypyrrole/palladium supported composite paper is obtained; 3, the polypyrrole/palladium supported composite paper is taken out and washed with deionized water and absolute ethyl alcohol, and finally the polypyrrole/palladium-cellulose paper base catalyst is obtained by drying. The dehydrogenation conversion efficiency of the polypyrrole/palladium-cellulose paper base catalyst can reach more than 20mol H2mol Pd<-1> min<-1>, and the polypyrrole/palladium-cellulose paper base catalyst has superior stability and repeat practicability.

The invention discloses a preparation method of a NiAuPd nano alloy/graphene high-efficiency catalyst. The preparation method comprises the following steps: preparing graphene oxide through a Hummers method, adding an appropriate amount of sodium dodecyl benzene sulfonate into the prepared graphene oxide, ultrasonically dispersing to obtain uniformly dispersed graphene oxide gel, adding chloroauric acid, sodium tetrachloropalladate and nickel nitrate into a certain amount of graphene oxide gel in proportion, stirring and dissolving, regulating the pH to be 9-10 by 1 mol/L of sodium hydroxide, and transferring a solution into a hydrothermal reaction kettle for reaction for 5-8 hours at 100-180 DEG C, thereby preparing the NiAuPd nano alloy/graphene high-efficiency catalyst through a one-step hydrothermal process. The preparation method disclosed by the invention is simple in process and equipment; the NiAuPd nano alloy/graphene high-efficiency catalyst is directly prepared by adopting the one-step hydrothermal process; the prepared NiAuPd nano alloy/graphene high-efficiency catalyst has very high catalytic activity, can be applied to the fields of fuel cells, methanol, hydrogen production by formic acid decomposition, energy development and improvement, and the like, and has a very wide application prospect.

The invention relates to a preparation method of a polyvinylpyrrolidone intercalation modified montmorillonite loaded palladium catalytic material, and belongs to the technical field of the preparation process of the chemical catalyst. The preparation method comprises the following steps: (1) preparing an acetic acid of the polyvinylpyrrolidone; (2) preparing a sodium tetrachloropalladate solution; (3) preparing a montmorillonite/polyvinylpyrrolidone intercalation composite mixing system through solution intercalation; and (4) preparing the polyvinylpyrrolidone intercalation modified montmorillonite loaded palladium catalyst. The preparation method of the polyvinylpyrrolidone intercalation modified montmorillonite loaded palladium catalytic material keeps the excellent solvent resistance,the higher thermal stability and the stronger molecular adsorption property of a montmorillonite matrix, and also has the excellent complexing power and the size stabilizing effect of a polyvinylpyrrolidone macromolecule on the active component of a palladium nano-particle, and the catalytic material shows excellent comprehensive performances in the organic catalytic reaction.

The invention discloses a tripod shaped platinum palladium copper alloy catalyst capable of catalyzing oxygen reduction reaction, and a preparation method thereof. The preparation method comprises following steps: a sodium tetrachloropalladate solution, a chloroplatinic acid solution, and a copper chloride solution with concentrations ranging from 5 to 50mM are prepared respectively, a hydrochloric acid solution with a concentration ranging from 1 to 10M, and an ascorbic acid solution with a concentration ranging from 0.05 to 0.2M are prepared respectively; 4.5ml of the sodium tetrachloropalladate solution, 4.5ml of the chloroplatinic acid solution, and 4.5ml of the copper chloride solution are mixed, 0.1 to 1ml of the hydrochloric acid solution is added, 0.1 to 1g of potassium bromide, and 0.01 to 0.1g of F127 are added, and an obtained mixture is mixed to be uniform; 1 to 5ml of the ascorbic acid solution is added; after solution full mixing, an obtained mixed product is heated to 50to 150 DEG C in an oil bath pan, reaction is carried out for 1 to 10h, and washing, centrifugation, and drying are carried out so as to obtain the tripod shaped platinum palladium copper alloy catalyst. The preparation method is simple; the reaction time is short; the material prepared at normal temperature under normal pressure possesses excellent electrochemical oxidation-reduction ability.

The invention discloses a special material for a new-energy battery shell and a preparation method thereof. The special material for the new-energy battery shell comprises the following raw materialsin parts by weight: 100-135 parts of polypropylene, 5-12 parts of niobium pentoxide, 6-15 parts of sodium tetrachloropalladate, 8-14 parts of modified chabazite powder, 8-12 parts of modified lignin and 2-6 parts of xylitol. The special material for the new-energy battery shell has excellent flame retardance, good mechanical properties, corrosion resistance and cold resistance, a high melt index and good fluidity and is easy to process.

The invention relates to the technical field of metal nano-enzymes, in particular to a ternary metal Pd-M-Ir nano-enzyme, a preparation method(M = Ru, Rh, Au)of the ternary metal Pd-M-Ir nano-enzyme,and application of the ternary metal Pd-M-Ir nano-enzyme in immunoassay. The preparation method comprises the following steps: reducing sodium tetrachloropalladate with ascorbic acid to prepare a parent nucleus of a metal nano-enzyme; and reacting the parent nucleus with a metal M salt to prepare a Pd-M system, and reacting the Pd-M system with an iridium salt at a high temperature to form the ternary metal Pd-M-Ir nano-enzyme. The ternary metal Pd-M-Ir nano-enzyme has good tolerance to acid, base and temperature, especially the ternary metal PdRuIr nano-enzyme, can replace horse radish peroxidase to be applied to immunohistochemistry. And an idea is provided for improving immunohistochemical sensitivity.

The invention discloses a preparation method of a gold nanorod-palladium composite material. The preparation method comprises the following steps of firstly, preparing a gold nanorod raw material, re-dispersing, adding a tetraethoxysilane (TEOS) solution in a certain manner, growing mesoporous silica on the surface of a gold nanorod, then the gold nanorod coated with silicon dioxide is placed in an oil bath at the temperature of 60 DEG C to be heated, a corrosion process is started by adding a corresponding amount of hydrochloric acid, then the corrosion is finished by adding a large amount of cold methanol, centrifuging a product (8000rpm, 10min), and dispersing obtained precipitate in an aqueous solution, and finally, adding a corresponding amount of a sodium tetrachloropalladate solution, then adding a corresponding amount of an ascorbic acid solution, stirring for 1 minute to obtain a final product, and observing growth condition through a transmission electron microscope graph. The gold nanorod-palladium composite material prepared by the preparation method is uniform in growth; the preparation method has simple reaction conditions, high reaction rate and low cost.

The invention provides a supported palladium catalyst used for low-temperature catalytic removal of VOCs. The supported palladium catalyst is prepared through the steps of: 1) dissolving cobalt nitrate hexahydrate in water, dissolving sodium tetrachloropalladate in anhydrous ethanol, and uniformly mixing the two solutions; 2) adding a supporter SBA-15 or SBA-16 to the mixed solution, allowing the mixed solution to stand at room temperature, performing rotary evaporation until no water exists, and drying and roasting the solid to produce Pd-Co/SBA-15 and Pd-Co/SBA-16 catalysts; 2) preparing acid solutions in different types, soaking the Pd-Co/SBA-15 or Pd-Co/SBA-16 catalyst in the acid solutions, and roasting the catalyst, after the acid treatment, at 400-500 DEG C to form acid-processed Pd-Co/SBA-15 and Pd-Co/SBA-16 catalysts. The catalyst is greatly reduced in pore blocking with more active sites exposed, so that the catalyst is suitable for catalytic removal of VOCs, such as benzene-series substances, indoor or outdoor.

The invention provides a preparation method of a high-selectivity palladium catalyst, which comprises the following steps of: (1) dissolving 2-ethyl anthraquinone in isopropanol at room temperature by sufficiently stirring, adding aluminum isopropoxide to the solution according to the mass ratio of 2-ethyl anthraquinone to aluminum isopropoxide being 1:(28.57-100), heating, sufficiently stirring for dissolving, dripping mixed liquid of acetic acid and water, and sufficiently stirring at room temperature for hydrolysis; (2) aging a hydrolysis product at 80 DEG C for 20h, separating, washing, drying and calcining to obtain gamma-Al2O3 powder; and (3) isometrically immersing the gamma-Al2O3 powder with sodium tetrachloropalladate solution, washing, drying and calcining to obtain the efficient loaded palladium catalyst. The preparation method has the advantages of novelty, simple operation, controllable specific area, pore diameter and other structure properties of the product and the like; and the prepared 2-ethyl anthraquinone regulated and controlled catalyst has good selectivity and activity on anthraquinone hydrogenation reaction.

The invention provides a preparation method of palladium in-situ modified copper-cobalt doped cerium dioxide nanospheres, and belongs to the technical field of nano material preparation. In the process of the preparation method, a solvothermal method is utilized, ethylene glycol is used as a solvent, and the copper-cobalt double-doped spherical cerium dioxide nanospheres are obtained through a high-temperature and high-pressure reaction; and in-situ modifying of palladium element in Sodium tetrachloropalladate to the surfaces of the copper-cobalt double-doped cerium dioxide nanospheres by using a chemical reduction method is carried out to obtain the palladium in-situ modified copper-cobalt doped cerium dioxide nanospheres. The palladium in-situ modified copper-cobalt doped cerium dioxidenanospheres are regular in morphology and uniform in size and have good dispersity in an organic solvent, and the good microstructure of the palladium in-situ modified copper-cobalt doped cerium dioxide nanospheres is of great significance in improving the catalytic activity of cerium dioxide and enabling the palladium in-situ modified copper-cobalt doped cerium dioxide nanospheres to be of greatsignificance in the structure of an electrochemical biosensor. The great potential of improving the sensitivity of the electrochemical biosensor is realized.

The invention belongs to the technical field of direct formic acid fuel cell electrocatalysts, and relates to a multi-hole ultrathin palladium nanosheet catalyst and a preparation method and application thereof. The method comprises the steps of (1) introducing an inert gas or nitrogen into methanol to remove oxygen dissolved in the methanol, and then heating the methanol to a certain temperature;(2) introducing carbon monoxide into the methanol obtained in the step (1) until the methanol is saturated; (3) adding sodium tetrachloropalladate into another part of methanol, then introducing an inert gas or nitrogen into the methanol to remove oxygen dissolved in the solution, then adding the solution into the methanol saturated by carbon monoxide obtained in the step (2), and continuing to react; and (4) cleaning the product obtained in the step (3). The catalyst prepared according to the invention has an ultra-large electrochemical activity specific surface area, ultra-high formic acidcatalytic oxidation activity and excellent electrochemical stability, and the method does not involve the use of surface active materials such as polyvinylpyrrolidone (PVP) and cetyltrimethylammoniumbromide (CTAB).

The invention discloses a preparation method for a low-density foam palladium material. The preparation method is characterized by comprising the following steps: adopting sodium tetrachloropalladate(II) as palladium resources to prepare nano-palladium hydrosol; taking polystyrene microsphere with negative charges on the surface as a template to prepare a polystyrene microsphere aqueous solution with palladium plated on the surface; preparing a polystyrene microsphere suspending liquid with palladium particles coated on the surface; adopting a rheocasting method to pour the palladium plated polystyrene microsphere suspending liquid into a mould for moulding, drying and demoulding to prepare a palladium plated polystyrene microsphere block material; calcining at the temperature of 300-500 DEG C for 6-24 h to obtain the low-density foam palladium material. The low-density foam palladium material prepared by the preparation method has the volume density which can be as low as 0.42 g/cm<3>, the specific surface area reaches 18.5 m<2>/g, the poriness and microstructure are uniform and adjustable, and a certain mechanical strength is achieved; the low-density foam palladium material is suitable for the fields of catalyzing, sensing, heat change and the like, and can also be applied to the fields of storage, purifying, separation and the like of hydrogen isotope.

The invention provides an rGO-coated Pd7Se2 composite structure nano material as well as a preparation method and application thereof, and belongs to the technical field of synthesis and preparation of nano materials. According to the composite structure nano material, Pd7Se2 nano particles are uniformly anchored on reduced graphene oxide (rGO), the particle size of the Pd7Se2 nano particles is -100nm, and the shape of the Pd7Se2 nano particles is approximately cubic. According to the preparation method, seleninic acid and sodium tetrachloropalladate are taken as reaction substances, deionized water is taken as a reaction solvent, and the nano material with the rGO-coated Pd7Se2 composite structure is synthesized in one step through a hydrothermal method. An electrode loaded with the rGO-coated Pd7Se2 nano material shows excellent catalytic performance and continuous electrolytic stability in electrocatalytic nitrogen fixation, and is simple in synthesis process, relatively low in toxicity, mild in reaction condition and low in cost.

The invention provides a preparation method of a coralline-like Pd4Se compound, and belongs to the technical field of nano material synthesis and preparation. According to the method, seleninic acid and sodium tetrachloropalladate are used as reaction substances, deionized water is used as a reaction solvent, the coralline-like Pd4Se compound nano material is synthesized in one step through a hydrothermal method. The synthesis process is simple, is low in toxicity and is gentle in reaction conditions and low in cost; the synthesized Pd4Se is high in purity, and the method is suitable for industrial production.

A preparation method of a PdAl2O3 catalyst belongs to the field of chemistry, and specifically the invention relates to an ultrasonic impregnation method for preparation of a Pd-Al2O3 catalyst. The preparation method of the Pd-Al2O3 catalyst provided by the invention is low in cost, simple in reaction conditions and high in yield. The preparation method of the Pd-Al2O3 catalyst provided by the invention is characterized by comprising the following steps: dissolving PdCl2 and NaCl in deionized water with conductivity less than 1*10<-6> S/cm made in the laboratory, preparing a sodium tetrachloropalladate impregnation solution according to palladium load of 0.13%, adding spherical alumina carriers calcined at different temperatures into the impregnation solution and immediately conducting ultrasonic impregnation in ultrasonic equipment, pouring residual liquid 1-3 h later, aging at room temperature for 3-12 h, finally drying at 100 DEG C, and roasting at 300-600 DEG C to obtain the Pd-Al2O3 catalyst.

The invention discloses a preparation method of a PdAuAg hollow nanosheet electrocatalyst. Reaction materials include silver nitrate, PVP, HAuCl4 and sodium tetrachloropalladate. The PdAuAg hollow nanosheet electrocatalyst prepared by the preparation method has good dispersivity and is of a hollow lamellar structure with a porous surface, the lamellar thickness is uniform and is about 40nm, the hollow nanosheet structure with the porous surface is beneficial to promoting the utilization efficiency and mass transfer process of the electrocatalyst, and moreover, a synergistic effect exists amongPd, Ag and Au so that the electrocatalytic activity and stability of the electrocatalyst can be promoted.