94 results about "Rhodium salt" patented technology

The invention discloses an activated carbon regeneration method. Waste activated carbon and a desorption solution are mixed and pulped to obtain slurry, post treatment is conducted on the slurry to obtain regenerated activated carbon, and the desorption solution contains an organic solvent and water. The post treatment is performed in the mode (a) that the slurry performs catalyzed wet oxidation reaction, and the regenerated activated carbon and an oxidation filtrate serving as the desorption solution to be repeatedly used are obtained through filtration; or the mode (b) that the slurry performs desorption regeneration reaction, the regenerated activated carbon and a desorption filtrate are obtained through filtration, and then the desorption filtrate performs catalyzed wet oxidation reaction to obtain a reaction solution serving as the desorption solution to be repeatedly used. The catalyst adopted for the catalyzed wet oxidation reaction is one or more of copper salt, rhodium salt and palladium salt. The waste activated carbon is regenerated by means of the activated carbon regeneration method, the activated carbon regeneration rate is high, the losses of the activated carbon and the desorption solution are small, the reaction conditions in the regeneration process are moderate, and energy consumption is lower.

The invention discloses a catalyst composition for reducing the normal-to-isomer ratio of aldehyde products which are obtained through a hydroformylation reaction of olefin. The catalyst composition comprises a solvent, a catalyst active component, a cocatalyst, an assistant A and an assistant B, wherein the catalyst active component is a rhodium salt, the cocatalyst is triphenylphosphine, the assistant A is a phosphine-containing alkyl ligand, and the assistant B is indole structure-containing doped benzene. The catalyst composition is applied to hydroformylation of olefin, the normal-to-isomer ratio in the products can be reduced, and the selectivity and stability of a catalyst under the condition of a low normal-to-isomer ratio of less than 10 can be improved.

The invention relates to a catalyst for preparing methyl alcohol from syngas. The preparation method of the catalyst comprises the following steps: putting a CuO/ZnO/Al2O3 catalyst into a container, adding a rhodium salt solution with the same volume, immersing for 6-48 h, and then drying for 8-16 h at 80-120 DEG C; roasting the obtained product for 3-6 h at 300-400 DEG C to obtain the catalyst comprising 40-65 percent of Cu, 25-40 percent of Zn, 2-20 percent of Al and 0.1-0.2 percent of Rh in molar ratio. The catalyst has the advantages of high activity and good stability.

The invention is a method for recovering catalyst rhodium from industrial waste liquid of carbonyl synthesis of acetic anhydride. The invention is characterized in that the method comprises the following steps: (1) waste liquid incineration and cineration, (2) melt oxidation transformation, water washing, (3) preparation of aqueous rhodium salt solution, (4) zinc powder displacement, (5) pickling for zinc powder removal. The content of the recovered rhodium is not less than 78%, and the recovery rate is not less than 98%. The invention provides a method for recovering catalyst rhodium from industrial waste liquid of carbonyl synthesis of acetic anhydride, which has high recovery rate, simple process, and low cost. The content of the recovered rhodium is not less than 78%, which not only meets the process requirements for the carbonyl synthesis of acetic anhydride, but also greatly reduces recovery cost; the recovery rate of rhodium is not less than 98%, and the method provides genuine goods at a fair price, and is convenient for a fair shake.

The invention discloses a high purity rhodium recovery purification method, relates to precious metal recovery purification field, and especially relates to a method for separation and purification of rhodium from other precious metals and base metals in a rhodium-containing waste leachate. According to the method, tetramethylammonium chloride is used as a precipitant, the rhodium solution concentration is controlled to 30-80 g/L, firstly, a small amount of precipitant is added for reaction to remove platinum, iron and other high valence impurities, excessive precipitant is added into the obtained filtrate for boiling and reflux at 110-120 DEG C for 24 h-48 h to obtain a rhodium salt precipitate. High purity rhodium hydroxide is obtained by full washing, dissolving, passing through resin, and potassium hydroxide precipitation carried out on the rhodium salt precipitate. The high purity rhodium recovery purification method is strong in process applicability, simple in operation, low in cost, high in product purity, and free of emission, and may not cause environmental pollution.

The invention discloses a carbon-supported nickel oxide-modified ultrafine platinum rhodium nanorod alloy electrocatalyst for an alkaline hydrogen evolution reaction and a preparation method and application thereof, and belongs to the technical field of hydrogen evolution of alkaline electrolyzed water. Platinum salt is used as a platinum source, cobalt salt is used as a cobalt source, rhodium salt is used as a rhodium source, and a nickel oxide-modified ultrafine platinum rhodium nanorod is generated through reduction under the action of an organic solvent and a structure directing agent. According to the invention, the morphology and components of the catalyst are controlled by controlling the reaction temperature, the type and concentration of the structure directing agent and the reaction atmosphere, and the preparation condition facilitating the nickel oxide-modified ultrafine platinum rhodium nanorod to show the most excellent hydrogen evolution activity is explored and obtained.The preparation method is simple and convenient in technological process, low in synthesis cost and beneficial to batch production. The nickel oxide-modified ultrafine platinum rhodium nanorod prepared by adopting the method has the excellent hydrogen evolution performance and is suitable for hydrogen evolution reaction of alkaline electrolyzed water.

The invention discloses a composite of a carbon nanotube and metal nano-particles and a synthetic method thereof, belonging to the technical field of carbon nanotubes. The composite of the carbon nanotube and metal nano-particles is characterized in that the metal nano-particles are dispersed on the surface of the carbon nanotube, the carbon nanotube does not go through surface oxidation treatment, and the metal nano-particles which are uniformly dispersed have less than 20 percent of monodispersion coefficient. The synthetic method of the composite of the carbon nanotube and metal nano-particles comprises: the carbon nanotube, metal salts and polyalcohol are mixed and stirred at constant temperature to react, wherein, the carbon nanotube does not go through surface oxidation treatment, ionic liquid is added to the reactant, and the metal salts can be one or a plurality of salts from platinum salt, gold salt, ruthenium salt, palladium salt, rhodium salt and iridium salt. Compared with the prior art, the composite of the invention has the advantages of complete structure and unaffected conductivity of the carbon nanotube, uniform particle dispersion, relatively small size distribution and favorable electro chemical property.

A preparation method of a homogeneous mesoporous rhodium oxide / alumina composite catalysis material of the invention comprises the following steps: (1) stirring a template and aluminum salt in absolute ethyl alcohol to obtain a homogeneous alumina sol; (2) dissolving rhodium salt in deionized water to prepare a solution, adding the solution into the alumina sol and carrying out ultrasonic disperse to obtain a rhodium oxide / alumina composite sol; (3) stirring the composite sol at room temperature and volatilizing solvent to obtain a rhodium oxide / alumina composite gel; (4) calcining the composite gel under 400-600 DEG C and removing the template to obtain the homogeneous mesoporous rhodium oxide / alumina composite catalysis material. The composite catalysis material can be applied to preparation of a methane catalysis combustion sensor and has beneficial effects of high specific surface area, loosening porous structure and capability of enhancing catalytic activity of a catalyst; the methane catalysis combustion sensor has characteristics of micromation, low power dissipation, short response time, high output signal, large signal to noise ratio, portability and convenience, etc.

This invention particularly relates to the high-energy radiography, the high sensitivity, high contrast of the silver halide emulsion coating plate's photosensitive materials which the high-speed photographic technique uses and the silver halide emulsion's preparation method and its use. The stated silver halide emulsion contains the iodine silver bromide which has the silver bromide as the main part, the proportion of the Br and I is 95~98%mol to 5~2%mol, the weight proportion of the photo indolent glue and the silver is 0.7 ~ 1.5 to 1, the iridium salt and rhodium salt or strontium salt's concentration is10-3~10-6mol/molAgBrI, the particle size is 1.5-2.0 mum.. The double beam emulsion preparation method which adopts the computer control uses the silver halide as the main iodine silver bromide crystallite emulsion, on the emulsification or the chemical.

The invention relates to a Rh-based catalyst loaded on a titanium dioxide nanorod as well as a preparation method and application thereof. The catalyst takes a TiO2 nanorod as a carrier, is loaded with a small amount of active component Rh and takes a small amount of Fe and Li as aids. During preparation of the catalyst, the TiO2 nanorod carrier which is synthesized by a hydrothermal method is immersed in an aqueous solution of rhodium salt, iron salt and lithium salt by a total immersion method, and then a RhFeLi/TiO2NR catalyst is obtained through drying and roasting. The catalyst provided by the invention is suitable for reaction of preparing ethanol through carbon dioxide hydrogenation and takes Rh as the active component; compared with the traditional Rh catalysts, the Rh-based catalyst has the characteristics of high ethanol selectivity and low operation pressure; meanwhile, compared with the commodity TiO2-loaed catalyst, the Rh-based catalyst taking the TiO2 as the carrier greatly improves the catalyst activity and can maintain stable for a long time.

The invention discloses a preparation method for a rhodium-palladium alloy. The preparation method comprises the following step: performing electro-co-deposition by using a rhodium salt as a rhodium source and a palladium salt as a palladium source in a same aqueous solution system to obtain the rhodium-palladium alloy. At the same time, the invention discloses a preservation method for the rhodium-palladium alloy prepared by the above method; and the preservation method comprises the following step: placing the rhodium-palladium alloy obtained by the electro-co-deposition into ethanol or kerosene for preservation. At the same time, the invention discloses an application of the rhodium-palladium alloy prepared by the above preparation method in catalysis of hydrogenation defluorization ofa fluorinated aromatic compound. The preparation method disclosed by the invention can realize rapid and precise regulation and control of a reaction rate; the preservation method disclosed by the invention facilitates prevention of oxidation of the rhodium-palladium alloy and long-term storage; when the rhodium-palladium alloy prepared by the preparation method is applied to the catalysis of thehydrogenation defluorization of the fluorinated aromatic compound, a using amount of a catalyst is greatly reduced, time of a catalytic reaction is shortened, degradation efficiency of the fluorinatedaromatic compound is improved, and discharge of fluorinated aromatic pollutants is reduced; and the rhodium-palladium alloy is environmentally friendly.

Provided are metal particles comprising an at least partial solid solution of rhodium and gold. Also provided is a method for producing metal particles comprising adding a boron-based reducing agent to a mixed solution containing a rhodium salt and a gold salt to produce the metal particles comprising an at least partial solid solution of rhodium and gold. Furthermore, provided are an exhaust gas purifying catalyst comprising the metal particles supported on a catalyst support and a method for producing the same.

The invention provides a Pt/Rh nano composite material and a preparation method and application thereof. The Pt/Rh nano composite material comprises Rh nanosheets and Pt nanoclusters loaded on the Rhnanosheets. The preparation method includes: dissolving platinum salt and rhodium salt in a solvent, adding a surfactant and a reducing agent, performing heating reaction on the obtained mixed solution, and performing solid-liquid separation after the reaction to obtain the Pt/Rh nano composite material. The Pt/Rh nano composite material has the advantages that the prepared Pt/Rh nano composite material has high activating ability to oxygen and has a activity feature similar to oxide enzymes, the Pt/Rh nano composite material has evidently enhanced activity as compared with independent Rh sheets and Pt nanoclusters, the maximum reaction rate (Vmax) of the Pt/Rh nano composite material can reach 1.88*10<-7>M*s<-1>, and the Pt/Rh nano composite material can serve as the oxide enzyme mimic enzyme to replace a natural enzyme to be applied to fields such as immunoassay, biochemical detection and clinical diagnosis.

The invention relates to a supported phosphorus-doping rhodium-nickel catalyst as well as a preparation method and an application thereof. According to the method, graphene is taken as a supporter, rhodium salt and nickel salt are taken as raw materials, sodium hypophosphite is taken as phosphoric acid, and the materials are reduced to phosphorus-doping rhodium-nickel metallic nanoparticles through one step by sodium borohydride in an aqueous solution at the room temperature. Conditions are mild, the raw materials are easily available, large-scale industrial production can be realized, and the catalyst is uniform in morphology, small in size and high in catalytic activity and can be used for catalytic dehydrogenation.

The invention belongs to the field of fine chemical engineering, and relates to improvement and related chemical technology of a synthetic method of multi-substituted fused ring compounds. A preparation method of the multi-substituted fused ring compounds is characterized by comprising the following steps: using N-acyl arylamine and internal alkyne as raw materials, rhodium salt as a catalyst, and copper salt as an oxidant, and conducting a heating reaction in an organic solvent to synthesize a series of multi-substituted fused ring compounds. The invention mainly provides a new method for synthesizing the multi-substituted fused ring compounds. The preparation method has the advantages that the steps are simple, the raw materials are easy to get, the atom economy is high, and environment-friendly purpose is achieved. As the multi-substituted fused ring compounds are a kind of significant skeletal structures, and have very wide application in the fields of organic semiconductor materials and luminescent materials. Therefore, the preparation method has relatively high use value and social and economical benefits.

The invention discloses a method for separating and purifying rhodium in an impurity-containing rhodium solution. The method comprises the following process steps: S1, adjusting the acidity of the rhodium solution to 6-8 mol/L, and adding a prepared DETA solution to obtain filtrate I; S2, adding aqua regia into organic rhodium salt precipitate, heating and dissolving, adding hydrochloric acid to adjust the acidity of the solution to be 6mol/L and the rhodium concentration to be 50-80g/L, heating and boiling the solution, adding ammonium chloride to generate ammonium rhodate chloride precipitate, and quickly filtering to obtain filtrate II; and adding zinc powder into the filtrate to replace rhodium ions in the rhodium solution; S3, removing trace metal impurity ions through hydrogen type cationic resin; S4, adding hydrazine hydrate for reduction to prepare rhodium black; S5, mixing replacement slag, drying, and soaking with 1: 1 hydrochloric acid to remove zinc and other metal impurities; and S6, after filtering, dissolving filter residues with aqua regia, and returning the leachate to a purification process. The method has the characteristics of high direct recovery rate, simple operation process and high purity, and qualified rhodium powder with the purity of more than 99.95% can be obtained after the rhodium black is subjected to hydrogen reduction.

The invention belongs to printing plate-making field, especially refers to high image contrast silver halide emulsion and the manufacturing method in silver salt diffusion abevacuation plate-making system, and the application in the high image contrast CTP plate and CTP offset printing plate. The emulsion includes chlorobromide and chloride silver iodide, aurothio chemical induction enhancing agent, triaindole pyrazine stabilizer, colorant light spectrum induction enhancing agent, celluloid and water, the emulsion also includes iridium salt, rhodium salt or the compound of them with any ratio.

The invention discloses a preparation method of a catalytic system for olefin hydroformylation, which is characterized by comprising the following steps of: simultaneously adding cobalt salt, a phosphine ligand and an organic solvent into a reaction kettle, uniformly mixing, adding rhodium salt and olefin, and sealing the reaction kettle; introducing a mixed gas of CO and H2 into the reaction kettle; and raising the temperature to a reaction temperature, carrying out olefin hydroformylation reaction under the condition of violent stirring, and after the reaction is finished, cooling to room temperature or below. According to the invention, the stability of the phosphine/Rh complex and the stability of the catalyst are improved, the requirement of repeated recycling can be met, the rhodiumloss rate is low, and the cost is effectively saved; and when a complex formed by the polydentate phosphine ligand and Rh is used for olefin hydroformylation, the complex has high catalytic activity and aldehyde selectivity.

The invention discloses a homogeneous catalytic system for carbonyl synthesized butyraldehyde, and preparation and application of the homogeneous catalytic system. The homogeneous catalytic system for the carbonyl synthesized butyraldehyde comprises a solvent, a catalysis active ingredient, a cocatalyst, an accessory ingredient A and an accessory ingredient B, wherein the solvent is butyraldehyde; the catalysis active ingredient is a rhodium salt; the cocatalyst is triphenylphosphine; the accessory ingredient A is a phosphine heterocyclic benzene ligand or the combination of the phosphine heterocyclic benzene ligands with the following structures shown as the accompanying drawing, wherein in the formula, R is trimethylsilyls, phenyls or tertiary butyls; and the accessory ingredient B is an azacyclo-carbene ligand with the following structure shown as the accompanying drawing, wherein Ar is 2,4,6-trimethylphenyl. The homogeneous catalytic system has the advantages that the stability under the high-temperature working condition is improved; the homogeneous catalytic system can be applicable to a wider application range; the production process can be favorably adjusted and optimized; in addition, the reaction selectivity is improved; the occurrence of side reactions is reduced; the utilization rate of raw materials is improved; and the raw material consumption of unit products is reduced.

For the purpose of efficiently producing a high-purity rhodium-tellurium intermetallic compound particle, a solution containing a rhodium salt, a tellurium salt and a complexing agent is brought into contact with a reducing agent and an organic compound containing a sulfur atom and/or a nitrogen atom is used as the complexing agent.

The invention relates to a chiral diphosphine ligand, a rhodium complex of the chiral diphosphine ligand, a preparation method and application of the chiral diphosphine ligand. Specifically, optically pure 1-phenylethylamine is subjected to lithiation, substitution and other reactions, and two aryl phosphine substituents are respectively introduced into ortho-positions of amino and phenyl of the optically pure 1-phenylethylamine to prepare the chiral diphosphine ligand; the chiral diphosphine ligand and rhodium salt are complexed to generate a corresponding rhodium complex. The rhodium complex of the chiral diphosphine ligand developed by the invention can catalyze the asymmetric hydrogenation reaction of beta-dehydroamino acid ester, shows excellent catalytic activity and very high enantioselectivity, provides a synthetic method suitable for industrialization for optically active beta-amino acid and derivatives thereof, and has a good application prospect.