68 results about "Rhodium(III) chloride" patented technology

The invention relates to a preparation method of a recyclable and reusable hydrogenation catalyst. The preparation method is characterized by comprising the following steps: using a layer of poly dopamine to coat the surface of silicon dioxide, then adding an appropriate amount of deionized water as well as 0.5-500 mM rhodium chloride or ruthenium chloride or palladium chloride aqueous solution, performing reaction for 2-32 hours at the temperature of 20-100 DEG C, and performing oven-drying for 2-48 hours at the temperature of 25-75 DEG C to obtain a catalyst precursor; then adding 0.1%-20% of sodium borohydride aqueous solution, performing reaction for 1-24 hours at the temperature of 10-90 DEG C, and then performing oven-drying for 6-48 hours at the temperature of 10-90 DEG C to obtain the hydrogenation catalyst. The preparation method is simple in process, mild in reaction conditions and easy to operate; the hydrogenation catalyst has good stability to mediums such as air and water, and is simple in storage and processing manner; the operation of the hydrogenation catalyst does not need nitrogen protection; moreover, the hydrogenation reaction can be performed at lower temperature, the hydrogenation catalyst has a better hydrogenization effect after being used for 5 times in a recycling manner, and the recovery rate of the hydrogenation catalyst is more than 90%.

The invention discloses a preparation method of acetylacetonatocarbonyltriphenylphosphine rhodium. The preparation method comprises following steps: (1) under precipitation reaction conditions, a rhodium trichloride aqueous solution is contacted with a precipitating agent so as to precipitate rhodium and obtain a sediment containing rhodium; (2) the sediment containing rhodium is washed until chloride ion content is less than 1000ppm; (3) under acetylacetonato dicarbonylrhodium synthesis conditions, the sediment containing rhodium, which is obtained in step (2), is dissolved, and is contacted with acetylacetone so as to obtain a reaction liquid containing acetylacetonato dicarbonylrhodium; and (4) under acetylacetonatocarbonyltriphenylphosphine rhodium synthesis conditions, acetylacetonatocarbonyltriphenylphosphine rhodium in the reaction liquid is contacted with triphenylphosphine. The invention also discloses an olefin hydroformylation method. The preparation method of acetylacetonatocarbonyltriphenylphosphine rhodium is capable of reducing chloride ion content of products, increasing product synthesis yield, and improving catalytic activity of acetylacetonatocarbonyltriphenylphosphine rhodium.

The invention discloses a new method for synthesizing rhodium caprylate (II), which is characterized by comprising the following steps: dissolving a certain amount of rhodium chloride in water; adding 120 to 300 theoretical percent of octylic acid into the water, and adjusting the pH valve of the obtained solution to between 4.5 and 6.5 by using alkali; heating the solution to the temperature of between 90 DEG C and 100 DEG C, reacting for 3 to 5 hours, and filtering the solution when the solution is hot; and fully washing by using water, and drying to obtain a green rhodium caprylate (II) product. The method for synthesizing the rhodium caprylate (II) has the advantages of high reaction speed, high yield (over 95 percent), high product purity (over 99 percent), small environmental pollution, and suitability for industrial production.

The invention discloses a preparation method of acetylacetonato dicarbonylrhodium. The preparation method comprises following steps: (1) under precipitation reaction conditions, a rhodium trichloride aqueous solution is contacted with a precipitating agent so as to precipitate rhodium and obtain a sediment containing rhodium; (2) the sediment containing rhodium is washed until chloride ion content is less than 1000ppm; and (3) under acetylacetonato dicarbonylrhodium synthesis conditions, the sediment containing rhodium, which is obtained in step (2), is dissolved, and is contacted with acetylacetone. The invention also discloses an olefin hydroformylation method. The preparation method of acetylacetonato dicarbonylrhodium is capable of reducing chloride ion content of products, increasing product synthesis yield, and improving catalytic activity of acetylacetonato dicarbonylrhodium.

The invention discloses a preparation method of a noble metal doped bimetallic phosphide catalyst for electrochemical complete water splitting. Wherein the precious metal is rhodium, and the bimetallic phosphide is ferrocobalt phosphide. According to the preparation method, cobalt nitrate hexahydrate, iron nitrate nonahydrate, rhodium trichloride and urea are selected as raw materials, an ethylene glycol-assisted hydrothermal method is used for obtaining a rhodium-doped ferrocobalt double hydroxide precursor, then the rhodium-doped ferrocobalt double hydroxide precursor and sodium hypophosphite are annealed in a nitrogen atmosphere, and the petal-shaped rhodium-doped ferrocobalt phosphide nanometer material is obtained. The material can reach the current density of 10mA. Cm <-2 > only by the overpotential of 76mV in HER under an acid reaction condition. In 1 M KOH, when the current density reaches 10 mA. Cm <-2 >, the overpotentials of HER and OER are 48 mV and 303 mV respectively. When the Rh-doped Co2Fe-P composite material is used as a bifunctional electrode for overall water decomposition, the Rh-doped Co2Fe-P composite material can reach the current density of 10mA. Cm <-2 > in 1M KOH by only needing the low battery voltage of 1.54 V, and the current density is kept stable for not less than 30 hours. Meanwhile, the preparation method is simple and easy, the cost is low, the performance can be comparable with that of a commercial noble metal catalyst, and the application prospect is good.

The invention relates to a method for preparing high-purity acetylacetonatodicarbonyl rhodium through using rhodium trichloride. The method comprises the following steps: mixing rhodium trichloride containing metal impurities with N,N-dimethyl formamide and acetylacetone, heating to reaction completeness, cooling the obtained reaction solution to room temperature, adding deionized water, filtering the obtained precipitate, washing the precipitate to obtain crude acetylacetonatodicarbonyl rhodium, dissolving the crude acetylacetonatodicarbonyl rhodium in a sufficient amount of an organic solvent, washing the obtained organic phase by an aqueous solution of disodium ethylene diamine tetraacetate twice, and washing the organic phase by water once to obtain an acetylacetonatodicarbonyl rhodium solution. The method which adopts the acetylacetonatodicarbonyl rhodium containing the metal impurities as a reaction raw material enables the rhodium recovery process to be substantially shortened, so the production cost is reduced, and the economic benefit of the method is large.