6 results about "Rhodium compounds" patented technology

This invention discloses a nitrogen-doped graphene oxide / porous carbon supported metal catalyst, its preparation method, and its application. The catalyst preparation method includes: (a) mixing nitrogen-doped graphene oxide / porous carbon with a solvent to obtain mixture A; (b) mixing mixture A with a sodium alginate solution to obtain mixture B; and (c) mixing mixture B with a rhodium-containing compound, followed by washing and drying. The nitrogen-doped graphene oxide / porous carbon supported metal catalyst of this invention achieves a good balance between preparation cost, catalyst activity, and product selectivity. It also exhibits excellent recovery after the reaction, allowing the separated catalyst composition to be recycled, reducing production costs and facilitating industrial production applications.

The invention relates to the field of organic synthesis, and discloses a method for preparing aldehyde through hydroformylation of a Fischer-Tropsch product. The method comprises the following steps: under the action of a catalyst, carrying out hydroformylation reaction on a Fischer-Tropsch product and synthesis gas to prepare aldehyde; the catalyst is prepared based on a rhodium compound, a monophosphine ligand and a polyphosphine ligand. The catalyst is prepared by simultaneously adding the monophosphine ligand and the polyphosphine ligand, so that when aldehyde is prepared through hydroformylation reaction, the production cost of the aldehyde can be reduced while the normal / isomeric ratio of the product aldehyde is increased.

The application discloses a method for preparing platinum group metals from waste materials. The method comprises the following steps: high-temperature calcination of the waste materials with activated carbon and combustion-supporting agents to remove organic matters; high-temperature calcination of the waste materials with zinc powder to activate the waste materials; removal of part of impurities through subsequent oxidation leaching; preparation of a solution and a crystal corresponding to a platinum group metal compound through an oxidation-reduction process; reduction and dissolution of the platinum group metal compound with the aid of a reaction aid; purification of the platinum group metal compound through ammonium sulfide to obtain a pure iridium compound; purification of the pure iridium compound through adsorption resin to obtain a pure rhodium compound crystal; and finally, calcination and reduction to obtain a corresponding high-purity platinum group metal powder.

A method for producing an exhaust gas purification material, wherein the method comprises the steps in this order: (a) Impregnating a metal oxide support with a solution of a rhodium compound; (b) Drying the metal oxide support impregnated with a solution of a rhodium compound to obtain a rhodium-containing catalyst comprising the metal oxide support and rhodium particles supported on the metal oxide support; (c) Heating the rhodium-containing catalyst at a temperature within a range of 700 °C to 900 °C under an inert atmosphere; and (d) Mixing the rhodium-containing catalyst with a material that has a higher basicity than the basicity of the metal oxide support.

Provided are a method for producing an exhaust gas purification material capable of efficiently removing harmful components even after exposure to a high-temperature environment, and a method for producing an exhaust gas purification device. A method for producing an exhaust gas purification material, comprising, in order: (a) impregnating a metal oxide support with a rhodium compound solution; (b) drying the metal oxide support impregnated with the rhodium compound solution to obtain a rhodium-containing catalyst comprising the metal oxide support and rhodium particles supported on the metal oxide support; (c) heating the rhodium-containing catalyst to a temperature range of 700 to 900°C under an inert atmosphere; and (d) mixing the rhodium-containing catalyst with a material having a basicity higher than that of the metal oxide support.

The application relates to preparation and application of a photochemical coenzyme NADH photosensitizer, and belongs to the field of biological chemical industry.The method comprises the following steps: a rhodium compound [Cp*RhCl2]2 is combined with meso-tetra(4-carboxyphenyl)porphyrin TCPP into a single molecule porphyrin photosensitizer through an amide bond and a coordination bond; the functional groups include a carboxyl group and an amino group. The photosensitizer has simple synthesis steps, mild reaction conditions, and the coenzyme NADH regeneration efficiency can reach 33.4% under light irradiation for 10 min, and has wide application prospects in the aspect of biological catalytic conversion of CO2 to produce methanol.