35 results about "Rhenium compounds" patented technology

Process for preparing sulfinyl derivatives of Formula 2, useful as inhibitors of gastric acid secretion, comprising the selective oxidation of the corresponding sulfides of formula 1, as represented in the following schemeThe oxidation is performed with hydrogen peroxide in the presence of low amounts of a rhenium compound as catalyst, at a temperature from 0° C. to room temperature.

A compound and methods of making thereof having the structure shown below is disclosed. Each Ar is an aromatic group. Each M is palladium, platinum, or rhenium. At least one X in the compound has an aliphatic having at least 1 carbon atom. Each x, each y, and each z is an integer greater than or equal to zero. Each m is an integer greater than or equal to one. n is an integer greater than or equal to three.

The present invention relates to new rhenium compounds of formula (I)with medical utility, corresponding pharmaceutical compositions as well as medical uses thereof.

Provided is a process of producing activated particles comprising 188Re-isotopes and / or 186Re-isotopes by irradiating non-volatile and water-insoluble starting particles comprising a rhenium compound with neutrons. Further provided is a process of producing corresponding non-volatile and water-insoluble starting particles. Further provided are respective starting particles and activated particles, respectively, and a composition comprising a plurality of activated particles. The activated particles, and the composition comprising same are suitable for use in radionuclide therapy, and for cosmetic applications.

The invention discloses a rare earth-containing semi-regenerated reforming catalyst and a preparation method thereof. The preparation method specifically includes: step 1, preparing an alumina carrier, and the alumina is gamma prepared from aluminum hydroxide obtained by hydrolysis of alkoxy aluminum ‑Alumina; step 2, preparing impregnating solution, which contains platinum compound, rhenium compound, light rare earth compound, competing adsorbent and nitrogen-containing compound; the nitrogen-containing compound is urea; step 3, impregnating alumina carrier and steaming Drying the impregnating solution, evaporating to dryness at a temperature of 50-60°C; and step 4, drying and activating the catalyst. The catalyst is used for catalytic reforming reaction of hydrocarbons and has good activity and selectivity.

The invention discloses a supported copper-rhenium bimetallic catalyst. The catalyst comprises an active body, an active auxiliary agent, an alkali auxiliary agent and a carrier; the chemical composition of the active main body is Cu x Re (1‑x) O, wherein x is 0.7-0.9. The invention provides a preparation method of a catalyst, comprising: (1) dissolving a copper-containing compound, a rhenium-containing compound, a coagent precursor and a base auxiliary precursor in water, configuring a mixed salt solution, and dispersing the carrier in the mixing Obtain a slurry in a saline solution; (2) drop an alkaline precipitant into the slurry and adjust its pH value to 7-9, age to obtain a slurry, and control the temperature to 60-90°C during the dropping process; (3) The slurry is post-treated to obtain a supported copper-rhenium bimetallic catalyst. The invention provides a preparation method and application of a modified supported copper-rhenium bimetallic catalyst. The modified supported copper-rhenium bimetallic catalyst provided by the invention has higher reactivity and glycol selectivity.

The invention discloses a method for selectively recovering rhenium from a high-arsenic waste acid system, which comprises the following steps: (1) using a mixed extractant to extract high-arsenic waste acid to obtain an organic phase rich in rhenium; the mixed extractant Including trioctylamine, N1923, isoamyl alcohol and sulfonated kerosene, the mass proportions of trioctylamine, N1923, isoamyl alcohol and sulfonated kerosene are respectively 8‑25%, 2‑5%, 10‑20 % and 50-80%; (2) washing the rhenium-rich organic phase obtained in the step (1) with water, then back-extracting with a back-extraction agent, and collecting the back-extraction solution is the rhenium enrichment solution. The invention adopts the optimized mixed extractant to extract high-arsenic waste acid, the mixed extractant has good selective extraction of rhenium, the product rhenium compound has higher purity, does not require a large number of subsequent purification operations, and the amount of washing wastewater is less.

The invention discloses a polymetallic semi-regenerative reforming catalyst and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing a strip-shaped alumina carrier, and the alumina is prepared from aluminum hydroxide obtained by hydrolysis of alkoxy aluminum γ-alumina; Step 2, preparation of impregnation solution, which contains platinum compound, rhenium compound, light rare earth compound, competitive adsorbent and ammonium salt; Step 3, impregnation of alumina carrier, and then drying; Step 4, catalyst activation obtaining the catalyst oxidation state precursor; and step 5, reducing and presulfiding the catalyst oxidation state precursor. Introducing ammonium salts into the impregnation solution can strengthen the adsorption of metal compounds on the surface of the carrier. The prepared catalyst has a strong metal-carrier interaction, and the metal components in the catalyst are not easy to aggregate. The particle size is small, and it has good activity and selectivity. And stability, reduce the occurrence of hydrogenolysis side reactions in the reforming reaction process, the hydrogenolysis by-product methane is less, and the product aromatics are highly selective.

The invention relates to a preparation method for a composite silver catalyst used for producing ethylene oxide through ethylene oxidation. The preparation method comprises the following steps: 1) dissolving a compound containing silver and a compound containing chromium in an amine-contained solution or ammonia water so as to prepare a silver-ammonia solution; 2) subjecting an alpha-Al2O3 carrier to soaking in the silver-ammonia solution prepared in the step 1), taking out the soaked alpha-Al2O3, then carrying out draining, and carrying out calcination treatment so as to prepare a semi-finished silver catalyst; 3) dissolving the compound containing silver, the compound containing rhenium and an optional compound containing cesium in the amine-contained solution or the ammonia water so as to prepare the silver-ammonia solution; and 4) subjecting the semi-finished silver catalyst prepared in the step 2) to soaking in the silver-ammonia solution obtained in the step 3), taking out the soaked semi-finished silver catalyst, then carrying out draining, and carrying out calcination treatment so as to prepare the composite silver catalyst. The invention also relates to the composite catalyst and application of the catalyst in production of ethylene oxide.

The invention discloses a semi-regenerative reforming catalyst and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing a strip-shaped alumina carrier, and the alumina is prepared from aluminum hydroxide obtained by hydrolysis of alkoxy aluminum γ-alumina; step 2, preparing impregnating solution, which contains platinum compound, rhenium compound, competitive adsorbent and ammonium salt; step 3, impregnating the alumina carrier, and then drying; step 4, activating the catalyst to obtain the oxidation state of the catalyst body; and step 5, reducing and presulfiding the catalyst oxidation state precursor. Introducing ammonium salts into the impregnation solution can strengthen the adsorption of metal compounds on the surface of the carrier. The prepared catalyst has a strong metal-carrier interaction, the metal components in the catalyst are not easy to aggregate, the particle size of the catalyst metal components is small, and the catalyst has better performance. The activity, selectivity and stability of the product reduce the occurrence of hydrogenolysis side reactions in the reforming reaction process, the hydrogenolysis by-product methane is less, and the product aromatics are highly selective.

The invention relates to a rhenium catalyst and a method for catalyzed synthesis of 2-methyl-1,4-naphthoquinone by the rhenium catalyst. The rhenium catalyst is characterized in that a rhenium compound is supported on activated carbon and is coated with a carbon-nitride material; then the rhenium compound is calcined in the atmosphere of inert gas to obtain a coated supported rhenium catalyst, wherein the supporting mass of rhenium accounts for 1 to 3 percent of total mass of the catalyst. The method for the catalyzed synthesis of the 2-methyl-1,4-naphthoquinone by the rhenium catalyst comprises the following specific steps: adding 2-methylnaphthalene, an oxidizing agent and a catalyst into an organic solvent; controlling the reaction temperature and the time to obtain a product, namely the 2-methyl-1,4-naphthoquinone. The catalyst is simple in preparation method, good in stability and suitable for industrial production; in addition, the rhenium catalyst shows good activity and selectivity for the reaction and is easy to recycle and reutilize.