40 results about "Rhodium Metallicum" patented technology

The invention belongs to the field of water electrolysis hydrogen evolution catalytic materials, and particularly relates to a noble metal rhodium hydrogen evolution electrocatalyst and application. According to the invention, a rhodium oxide nickel-based phosphate carbon carrier is prepared by a two-step electro-deposition mild synthesis method, and has low Rh content. An electrochemical experiment result shows that the rhodium oxide nickel-based phosphate carbon carrier shows excellent HER electrochemical performance, and the performance of the rhodium oxide nickel-based phosphate carbon carrier can be comparable with that of a commercial Pt/C catalyst.

The invention discloses a technological method for removing base metals in rhodium/iridium secondary replacement residues. The technological process comprises the following steps: adding sulfuric acid into the rhodium/iridium secondary replacement residues with certain solid-to-liquid ratio; heating and introducing oxygen to leach the base metals such as copper, nickel and the like; and after reaction, filtering and washing the filter residues to neutral so as to obtain rhodium/iridium raw material containing relatively high-grade noble metals such as rhodium, iridium and the like as well as low content of base metals. The technology realizes effective separation of noble metals and base metals in the rhodium/iridium secondary replacement residues so that the leaching rate of the base metals in the secondary replacement residues is greater than 90% and the enrichment of rhodium, iridium and other noble metals is nearly 10 times, and provides a new method for leaching and separating the base metals to enrich the noble metals rhodium and iridium.

The invention discloses a method for preparing isononanoic acid from mixed isooctene through a two-step reaction comprising hydroformylation and oxidation. In the presence of a metal rhodium (Rh)-based catalyst immobilized by a novel porous organic polymer, the mixed isooctene is subjected to a hydroformylation reaction to obtain isononyl aldehyde, and then isononyl aldehyde and oxygen-containinggas are subjected to an oxidation reaction in an oxidation reactor at low temperature and low pressure without a catalyst to generate isononanoic acid. According to the method, the mixed isooctene canbe efficiently and highly selectively converted into the target product isononanoic acid under mild reaction conditions, the product is easily separated from reaction materials, and the single-pass yield of the obtained target product is relatively high.

Compounds of the following general formula (1a) or (1b). (1a) (1b) Further, there are provided a complex comprising a central metal of rhodium and any of compounds of the general formula (1a) or (1b) as a ligand; comprised of this complex, a catalyst for optically active ss-substituted carbonyl compound synthesis and catalyst for asymmetric 1,2 addition reaction; using these catalysts, a process for producing an optically active ss-aryl compound from an a,ss-unsaturated compound and an arylboronic acid derivative and process for producing an optically active aryl alcohol compound from an aldehyde compound and an aryl boronic acid derivative; a complex comprising a central metal of palladium and any of compounds of the general formula (1a) or (1b) as a ligand; comprised of this complex, a catalyst for asymmetric allyl-position substitution reaction; and using this catalyst, a process for producing an optically active dialkyl (1,3-disubstituted propenyl)malonate compound from a 1,3-disubstituted allyl acetate compound and a dialkyl malonate and process for producing an optically active allylamine compound from a 1,3-disubstituted allyl acetate compound and an amine compound. The compounds have not only the versatility of being usable in the synthesis of wide-ranging optically active aryl compounds but also the selectivity and reactivity permitting synthesis with high yield within a short period of time under industrially advantageous mild conditions.

The invention provides a catalyst for preparing cyclododecene through selective hydrogenation, a preparation method and applications thereof, wherein the catalyst comprises a carrier, a main metal rhodium attached to the carrier and an auxiliary metal attached to the carrier, a weight ratio of the main metal rhodium to the carrier is 0.03-5.0%, a weight ratio of the main metal to the auxiliary metal is (0.001-1):1, preferably (0.05-0.1):1, the carrier is one selected from a gamma-aluminum oxide, active carbon, silicon dioxide, calcium carbonate, an all-silicon molecular sieve, a titanium-silicon molecular sieve TS-1, a ZSM-5 molecular sieve, a beta-molecular sieve, hydrotalcite and kaolin, and the auxiliary metal is one or more than two selected from ruthenium, gold, silver, platinum, iridium, iron, bismuth, lead, tin, cerium, nickel, copper, zinc and cadmium. According to the present invention, with the catalyst, the cyclododecene preparation process route is simple, and can be completed through the one-step selective hydrogenation reaction by using 1,5,9-cyclododecyltriene as the raw material, wherein the selectivity can achieve 99.3-99.6%, and the conversion rate can achieve 99.8-100%.

A bimetal Rh-Li catalyst for the hydroxylation reaction of methanol to obtain acetic acid or the carbonylating reaction of methyl acetate to obtain ethylanhydride is disclosed, which has 3 basic structures and features high activity, selectivity and stability. Its preparing process includes such steps as copolymerization of 2-vinylpyridine or 4-vinylpyridine on acrylic acid, acrylate, or maleic acid anhydride, hydrolzying by strong alkali, acting on lithium hydroxide to obtain ligand, reacting on Rh compound and coordination.

The invention provides a preparation method of polymerized 3-hydroxybutyric acid, and the method is characterized in that the method comprises the following steps: S1, preparation of beta-butyrolactone: adding a diketene solvent into a hydrogenation reactor, carrying out hydrogenation under certain conditions under the action of a metal rhodium catalyst or an iridium metal catalyst to obtain beta-butyrolactone, performing filtering, and carrying out reduced pressure distillation to remove the solven. The synthesis method is simple, the yield is remarkably improved, the method can be used for industrial production, a hydrogenation and polymerization clean and green chemical synthesis method is adopted, reaction water can be repeatedly used, and the method is close to zero wastewater discharge.

The invention discloses a method for removing iron in a noble metal rhodium recovery process. The method comprises the steps of concentrating and incinerating a recovered waste solution of a triphenylphosphine acetylacetone carbonyl rhodium catalyst to obtain a solid rhodium and iron oxide mixture; chlorinating the mixture to obtain a mixture of rhodium chloride and iron chloride; adding chloridesalt and a hydrochloric acid solution into the mixture of rhodium chloride and iron chloride, and evaporating the mixture to dryness after reaction to obtain a mixture of chlorine rhodate and iron chloride; washing the mixture of chlorine rhodate and iron chloride with a polar organic solvent to remove iron chloride; and preparing residual chlorine rhodate into metal rhodium or rhodium chloride; and concentrating and incinerating the waste solution of the triphenylphosphine acetylacetone carbonyl rhodium catalyst to obtain a solid rhodium and iron oxidation mixture.

The invention discloses a method for preparing a metal-rhodium nanoparticle modified titanium dioxide nanotube array photocatalytic material. The method comprises the following steps: pretreatment, anodic oxidation, metal rhodium particle loading and annealing. According to the method, the raw materials are simple and readily available; rhodium nitrate and ethylene glycol serve as the raw materials, the process flow is simple, and obtained rhodium nanoparticles are uniformly distributed on surfaces of nanotubes, are spherical and are uniform in particle size; and due to the action of a resonance effect of metal ions, the photocatalytic activity of a titanium dioxide nanotube material can be effectively improved by the loading of the rhodium nanoparticles.

The invention discloses a carbon nanometer tube loaded rhodium catalyst system and an application thereof. The carbon nanometer tube loaded rhodium catalyst system is characterized in that a carbon nanometer tube loaded rhodium compound is taken as active species; a halogen promoter is added; a high-concentration noble metal rhodium catalyst can exist in a reaction system in a carbonylation reaction through the carbon nanometer tube loaded rhodium catalyst; the pulp liquid phase reaction can be achieved; the carbonyl synthesis rate is increased and the noble metal loss is reduced; the catalyst provided by the invention can increase the carbonyl synthesis rate and the yield of industrial device.

The invention relates to rhodium-loaded bismuth vanadate with efficient photocatalytic water splitting oxygen production performance and a preparation method and application of the rhodium-loaded bismuth vanadate. According to the preparation method, a liquid phase method is utilized to synthesize bismuth vanadate in a monoclinic crystal form, then RhCl<3> is loaded to the surface of the bismuth vanadate through a quasi-impregnation method, and a small-sized cluster with the Rh loading state being metal rhodium and oxidized rhodium coexistence is obtained through hydrogen-argon mixed gas thermal treatment, wherein the loading state is the key to improving the photocatalytic oxygen production performance of the bismuth vanadate, the optimal oxygen production performance is 7,224+/-380 micron-mol g<-1>h<-1>, and the apparent quantum yield (AQY) at 420nm wavelength is 29.19+/-1.05%. The bismuth vanadate with the efficient photocatalytic oxygen production performance can serve as an oxygenproduction end material of a photocatalytic total-water-splitting Z system, plays an important role in promoting further device production from a photocatalytic material, and has quite broad application prospects in the fields of environmental science and new energy.

The invention provides a preparation method of rhodium complex acetylacetonatocarbonyltriphenylphosphine rhodium. The preparation method comprises the following steps of: S1, dissolving rhodium metalsalt into pure water; S2, adding acetylacetone and triphenylphosphine into the same solvent, and performing uniform stirring; S3, filling a reactor with self-made redox resin; S4, adding a rhodium trichloride solution in S1 and the mixed solution of acetylacetone and triphenylphosphine in S2 into the reactor in proportion at a proper speed; and S5, after the reaction is finished, pumping the reactor solution into a condenser for solid-liquid separation to obtain the rhodium complex acetylacetonatocarbonyltriphenylphosphine rhodium. According to the preparation method of the rhodium complex, the production process is continuous, the production time is shortened, operation is easy and convenient, distillation is not needed, the utilization rate of metal rhodium is remarkably increased, the product purity is high, the yield is 88% or above, and the product purity reaches 99% or above.

The invention discloses a preparation method and application of a rhodium-based electro-catalytic material. Electro-catalytic hydrogen evolution has the advantages of being clean, environmentally friendly, low in equipment requirement and the like, however, high overpotential is a main obstacle of water electrolysis hydrogen production, and therefore an appropriate electro-catalyst needs to be found urgently. Rhodium as a cheap substitute of platinum shows excellent platinum-like performance in electro-catalysis, but simple and extendable synthesis of a rhodium catalyst with excellent hydrogen production performance still faces huge challenges. When the self-assembly precursor is prepared, metal rhodium can be changed into monatomic rhodium, rhodium atoms are highly dispersed, agglomeration of the metal rhodium in the calcination process is avoided, and therefore the excellent electro-catalysis hydrogen evolution effect is achieved.

The invention discloses a metal rhodium-1,2-di(diphenyl phosphine)ethane complex crystal, which belongs to a monoclinic system, the space group is P21/c, and the cell parameters are a(A) is 11.5646(8), b(A) is 14.1442(10), and c(A) is 17.2350(12). The preparation method of the metal rhodium-1,2-di(diphenyl phosphine)ethane complex crystal comprises the following steps: 1)preparing a 0.8-1.2g/L of rhodium chloride aqueous solution, adding stannous chloride, placing the solution under the temperature of 45-55 DEG C and keeping the setting time, placing the solution under room temperature and then cooling; 2)adding a 1,2-di (diphenylphosphine)ethane tetrahydrofuran solution in the above system to obtain the light yellow deposition; wherein the concentration of the solution is 0.08-0.12g/L; and 3)adding dichloromethane in the above system for layering, then volatilizing the solution, and generating the products at phase interface. The preparation method has the advantages of easy operation and mild condition, a traditional method for adopting a heating backflow mode is not used, and a new compound with latent catalysis performance is finally obtained.

The invention belongs to the technical field of electroplating, and discloses a high gloss decorative rhodium plating layer plating solution. The plating solution is mixed by the following concentrations of components: a rhodium sulfate solution with a metal rhodium massic volume content of 1 to 10g/L, a sulfuric acid solution with a massic volume concentration of 40 to 100g/L, a wetting agent with a massic volume concentration of 0.1 to 10g/L and a compound with a general formula of R-C9H7NO and a massic volume concentration of 0.1 to 10g/L; and the compound with the general formula of R-C9H7NO is used as a brightener and a brightening agent, wherein R is alkyl or alkoxy with 1 to 6 carbon atoms on a straight chain or a branched chain. The plating solution provided by the invention is concise in formula; the compound with the general formula of R-C9H7NO is used as the brightener and the brightening agent, so that the brightness of a rhodium plating layer after electroplating is 90 +/-0.3, the performance of the hodium plating layer is stable, the utilization rate of metal rhodium is as high as 99%, and the waste of raw materials is reduced. At the same time, an electrolytic deposition bath is good in stability, can be used continuously and is easy to maintain.

The invention discloses a method for selective deuteration of aromatic ring benzyl carbon-hydrogen bonds. According to the method, a metal rhodium catalyst is used for performing eta6 coordination activation on an aromatic ring, so that hydrogen-deuterium exchange can be selectively performed on the aromatic ring and a deuterated reagent at a benzyl position; strong acid or strong alkali does not need to be added, the cheap and easily available deuterated reagent is adopted as a deuterium source, so that the method has good universality for various aromatic hydrocarbons with different functional groups, can be applied to later selective deuteration of complex drug molecules, and has high application value.