41 results about "Rhodium Metallicum" patented technology

The invention discloses a catalyst for a hydroformylation reaction of alkene and a preparation method and application of the catalyst. The catalyst is prepared from a rhodium complex and a bidentate phosphine ligand, wherein the mole ratio of the bidentate phosphine ligand to metal rhodium in the rhodium complex is (1 to 100): 1; the rhodium complex is at least one of Rh(acac)(CO)2, RhCl3, [Rh(cod)Cl]2, [Rh(CO)2Cl]2, Rh(acac)(C2H4) or [Rh(C2H4)2Cl]2. According to the catalyst for the hydroformylation reaction of the alkene, the problem of the existing catalysts that the dialdehyde selectivityis low during the hydroformylation reaction of cyclic dienes can be effectively solved.

The invention discloses a rhodium reduction activation dissolution method, and relates to the technical field of noble metal metallurgy. The rhodium reduction activation dissolution method can be used for overcoming the defects of the prior art and aims at achieving a rhodium dissolution method which has the advantages of high dissolution efficiency, wet method normal-pressure dissolution, easiness for operation, short process flow, low production cost and wide rhodium waste dissolution range. The technical scheme is as follows: the rhodium reduction activation dissolution method comprises the following steps of: A, crushing and grinding rhodium wastes; B, mixing with an activating agent; C, carrying out acid-soluble activation; D, filtering; and E, dissolving. According to the invention, because zinc powder and a hydrochloric acid solution generate chemical reaction in the step C to generate H2, rhodium oxide contained in the solution can be reduced into metal rhodium through H2 at 100 DEG C, the dissolution activity of rhodium can not be reduced and can be enhanced so as to be favorable to subsequent dissolution, and the rhodium oxide is reduced into the metal rhodium without being dissolved by hydrochloric acid in the activated process. Thus, the rhodium reduction activation dissolution method disclosed by the invention has the advantages of high rhodium dissolution efficiency, rhodium normal-pressure dissolution, low dissolution temperature, easiness for operation, short process flow, low production cost and wide rhodium waste dissolution range.

The invention relates to a single-atom dispersed platinum group metal-based catalyst with a relatively high loading capacity and its application. Specifically, it is a metal rhodium (Rh), ruthenium (Ru), platinum (Pt), iridium (Ir), palladium (Pd) and titanium oxide two-component catalyst and its preparation and application. The metal is highly dispersed on the carrier titanium oxide in the form of single atom, and the metal content is as high as 0.4-2%. The catalyst of the present invention is suitable for the CO water gas shift reaction, can increase the conversion rate of CO and suppress the side reaction of methanation; meanwhile, it also has good low-temperature catalytic decomposition of liquid monopropellant grade anhydrous hydrazine used in satellite attitude control engines in the aerospace industry Activity and stability in use.

In order to addresses the problem regarding generation of cracks and detachment from a substrate due to internal stress associated with an increase in the thickness of a conventional rhodium plating film, the present invention provides a rhodium plating solution from which a dense amorphous rhodium-phosphorus plating film is obtained. This electrolytic rhodium plating solution is characterized bycontaining 1-20 g / L of metal rhodium (in the form of a sulfate or a phosphate), 10-100 mL / L of sulfuric acid or phosphoric acid, and 0.001-10 g / L of at least one compound selected from the group consisting of phosphorous acid, alkali metal salts of phosphorous acid, alkaline-earth metal salts of phosphorous acid, or ammonium salts of phosphorous acid.

The invention discloses a nanocarbon-loaded atomic-scale dispersion rhodium catalyst, a preparation method thereof, and application of the catalyst in hydrogenation reaction of nitrile compounds, and belongs to the technical field of synthesis of organic chemical raw materials. The catalyst takes nanocarbon as a carrier, precious metal rhodium is uniformly loaded on the surface of the nanocarbon carrier in an atomic-scale dispersion form, and the loading capacity of rhodium is 0.01%-0.38%. The catalyst is used for catalytic hydrogenation reaction of nitrile compounds, and the nitrile compounds are catalyzed under mild reaction conditions to generate secondary amine compounds; the catalytic reaction conditions are as follows: the reaction temperature is 40-80 DEG C, and the pressure is 0.2-0.8 MPa; and the catalyst is low in synthesis raw material cost, simple in preparation process, stable in performance, high in catalytic activity and good in selectivity.

The invention discloses an acetic anhydride rhodium complex, a preparation method and an application thereof. The acetic anhydride rhodium complex provided by the present invention has a structure such as formula. The present invention selects acetic anhydride capable of forming a stable coordination structure with metal rhodium as a ligand, uses rhodium acetate as a precursor of the complex, and prepares a carbonylation catalyst with excellent performance—a rhodium acetic anhydride complex. Due to the nature of the ligand, the complex has excellent solubility in the reaction system of catalytic methanol carbonylation and catalytic methyl acetate carbonylation reaction system. It can catalyze methanol to prepare acetic acid and methyl acetate under relatively mild conditions. The preparation of acetic anhydride exhibits excellent catalytic activity and selectivity; moreover, the catalytic activity of the complex of the present invention can be significantly improved by adding lithium iodide to the reaction system.

The invention discloses a double-phosphorus coordination compound of metal rhodium. The double-phosphorus coordination compound of the rhodium can be applied to catalysis of a carbon dioxide hydrogenation reaction, a strong sigma electron-drawing group is arranged on a double-phosphorus ligand, and the electron cloud of the rhodium can be increased, so that the speed of the step of catalyzing carbon dioxide hydrogenation reduction by the double-phosphorus coordination compound of the rhodium is increased, the catalytic efficiency is improved, and the reaction time is shortened.

The invention relates to a method for synthesizing an indene compound. According to the method, a 2-(3-(silyl) propionyl) benzonitrile compound and a phenylboronic acid compound are catalyzed by metal rhodium to react. The method comprises the following steps: 1, adding a 2-(3-(silyl) propionyl) benzonitrile compound, a hydroxyl (cyclooctadiene) rhodium (I) dimer and phenylboronic acid into a drying tube with magnetons; 2, slowly adding an organic solvent in a nitrogen atmosphere, carrying out a stirring reaction at 60 DEG C, stopping the reaction after the 2-(3-(silyl) propionyl) benzonitrile derivative completely reacts, and cooling to room temperature; and 3, filtering, washing, separating and purifying the mixture obtained in the step 2 to obtain the product. The indene derivative is succeffuly synthesized at high yield, compared with other methods for synthesizing the indene derivatives, the method has the advantages that the operation is simple and convenient, and the method is suitable for synthesizing the indene derivatives with large steric hindrance. In addition, no toxic substances are added and generated in the reaction process, and an alkaline reagent does not need to be added.

The invention discloses metal rhodium-1,2-bis(diphenylphosphine)ethane complex crystal, which belongs to the monoclinic crystal system, the space group is: P 21 / c, and the unit cell parameter is: a(Å)= 11.5646(8), b(Å)=14.1442(10), c(Å)=17.2350(12). The preparation method of metal rhodium-1,2-bis(diphenylphosphine)ethane complex crystal comprises the following steps: 1) preparing 0.8-1.2g / L rhodium chloride aqueous solution, and then adding stannous chloride thereinto , keep the solution at 45‑55°C for a set period of time, and then place it at room temperature to cool; 2) Add a THF solution of 1,2‑bis(diphenylphosphine)ethane to the above system to obtain Pale yellow precipitate; the concentration of the solution is 0.08‑0.12g / L; 3) Dichloromethane is added to the above system to form layers, and then the solvent is volatilized to generate a product at the phase interface. The preparation method of the invention is simple and easy, and the conditions are mild, unlike the traditional method of heating and reflux, and finally obtains a new compound with potential catalytic performance.

The invention relates to a rhodium-loaded liquid metal solution catalyst as well aspreparation and application thereof. The catalyst is characterized in that a carrier of the catalyst is silicon gel;active ingredients are metal rhodium; liquid metal gallium is used for dissolving the metal rhodium; the weight ratio of the metal rhodium, the liquid metal gallium indium tin and the carrier silicongel is 1:(20 to 680):(80 to 2700), wherein the mass ratio of the gallium to the indium to the tin is 1:(0.1 to 0.5):(0.1 to 0.5). According to a preparation method, a metal rhodium compound is added into the gallium indium tin liquid metal and is reduced by the metal gallium to obtain the liquid metal solution; then, silica gel is added; sufficient stirring is performed; the catalyst is obtained by loading the liquid metal solution onto the silicon gel. The metal liquid loaded solution catalyst can be used in hydroformylation reaction for catalyzing propylene, isobutene and styrene. The preparation of the catalyst is simple; high activity and selectivity are realized; the stability is high; the catalyst can realize the multi-time repeated utilization; basically no metal rhodium is lost; the method is suitable for industrial production.

The invention discloses a rhodium reduction activation dissolution method and relates to the technical field of precious metal metallurgy. The purpose of overcoming the deficiencies of the prior art is to achieve a rhodium dissolution method with high dissolution efficiency, wet normal pressure dissolution, simple operation, short process flow, low production cost and wide range of dissolving rhodium waste. The technical scheme is: A, rhodium waste crushed and ground; B, mixed with an activator; C, acid-soluble activated; D, filtered; E, dissolved. Beneficial effects: due to the chemical reaction between the zinc powder and the hydrochloric acid solution in step C, H2 is generated. At 60-100°C, H2 can reduce the rhodium oxide in the solution to metal rhodium, and the dissolving activity of rhodium will not decrease, but will increase , which is very beneficial to the subsequent dissolution. During the activation process, rhodium oxide is reduced to metal rhodium, which is not dissolved by hydrochloric acid. Therefore, the present invention has the advantages of high dissolving efficiency of rhodium, low dissolving temperature for dissolving rhodium under normal pressure, simple operation, short technological process, low production cost and wide range of dissolving rhodium waste.

The invention relates to a method for synthesizing indenoid compounds. The method uses metal rhodium to catalyze the reaction of 2-(3-(silyl) propionyl)benzonitrile compounds and phenylboronic acid compounds. Step 1: Add 2‑(3‑(silyl) propionyl) benzonitrile compound, hydroxy (cyclooctadiene) rhodium (I) dimer and phenylboronic acid into a drying tube with magnets; step 2. Slowly add an organic solvent under a nitrogen atmosphere, and stir the reaction at 60 ° C. After the 2-(3-(silyl) propionyl) benzonitrile derivative is completely reacted, stop the reaction and cool to room temperature; step 3, the The mixture obtained in step 2 is filtered, washed, separated and purified to obtain. The indenoid derivatives were successfully synthesized with high yield. Compared with other methods for synthesizing indenoid derivatives, the operation is simple and convenient, and can be suitable for the synthesis of large sterically hindered indenoid derivatives. In addition, no toxic substances are added or produced during the reaction process, and no alkaline reagents need to be added.

The invention belongs to the technical field of electroplating, and discloses a high-gloss decorative rhodium plating layer electroplating solution, which is formed by mixing the following components: 1-10g / L rhodium sulfate solution, 40-100g / L sulfuric acid Solution, 0.1-10g / L of wetting agent, 0.1-10g / L of the compound of the general formula R-C9H7NO; wherein the general formula is R-C 9 h 7 NO compounds are used as brighteners and whitening agents, and R is a linear or branched alkyl or alkoxy group with 1-6 carbon atoms. The formula of electroplating solution of the present invention is concise, adopts general formula to be R-C 9 h 7 The NO compound is used as brightener and whitening agent, so that the brightness of the rhodium coating after electroplating is 90±0.3, the performance of the rhodium coating is stable, and the utilization rate of metal rhodium is as high as 99%, which reduces the waste of raw materials. At the same time, the electrolytic deposition bath has good stability, can be used continuously, and is easy to maintain.