9results about "Raney catalysts" patented technology

The application provides a method for carbon dioxide capture and hydrogenation synthesis of methanol based on a eutectic solvent, and belongs to the technical field of carbon capture and utilization. The method comprises the following steps: weighing acetyl guanidine and ethylene glycol according to a proportion, mixing the acetyl guanidine and the ethylene glycol, stirring to prepare a eutectic solvent at a given temperature, capturing carbon dioxide in flue gas by using the eutectic solvent to form a rich liquid, transferring the rich liquid into a high-pressure reaction kettle, adding a catalyst, filling in hydrogen, increasing the temperature to perform a carbon dioxide hydrogenation reaction, filtering to obtain a catalyst and a mixture of the eutectic solvent and methanol after the reaction, and performing flash evaporation on the mixture to obtain product methanol and regenerated eutectic solvent. After capturing carbon dioxide in the flue gas, the method directly performs in-situ carbon dioxide hydrogenation in the absorbent to prepare methanol, avoids problems such as high energy consumption of carbon dioxide desorption, high reaction temperature and low single-pass conversion rate in a traditional gas-solid phase reaction process, and has a simple process and easy regeneration of the eutectic solvent.

The present invention provides a membrane electrode for hydrogen production by alkaline water electrolysis, a method for producing the same, and an electrolytic cell. The manufacturing method according to the present invention is a method of direct coating and hot pressing, which can obtain a membrane electrode in which the catalyst layer is uniform and firmly attached to the surface of the diaphragm, can be given good stability to the membrane electrode, and the obtained membrane electrode has a significantly reduced water electrolysis overpotential. The manufacturing method includes the step of directly coating a catalyst slurry on both sides of a diaphragm, drying it, hot pressing it, and then forming a catalyst layer on each side of the diaphragm to obtain the membrane electrode, wherein the diaphragm is selected from a porous diaphragm or an alkaline anion exchange membrane, the catalyst slurry contains a binder solution and a catalyst, the binder solution is one or more of a perfluorosulfonic acid resin solution and a perfluorosulfonic acid ionomer dispersion, the mass concentration of the binder solution is 5 to 30%, and the mass ratio of the binder solution to the catalyst is 1:1 to 4:1.

The present invention provides a method for synthesizing 7-ketolithocholic acid or its intermediates produced from a novel intermediate I-1. In the method, bisnoralcohol, a decomposition product of phytosterol, is used as a starting material, and 7-ketolithocholic acid or its intermediates can be obtained through oxidation, Knoevenagel reaction (or Wittig reaction), hydrogenation, esterification, ketal protection, allylic oxidation, ketal deprotection, and hydrogenation. The method of the present invention allows easy availability of raw materials, high yields, simple and mild reaction conditions, and is suitable for industrial production.

This invention discloses a method for preparing m-phenylenediamine, relating to the field of fine chemical hydrogenation synthesis technology. The method involves preparing a homogeneous feed solution by mixing pretreated isophthalonitrile and anhydrous methanol. A modified Raney Ni catalyst is added to the homogeneous feed solution for low-pressure hydrogenation. The modified Raney Ni catalyst is then separated from the homogeneous feed solution after the low-pressure hydrogenation reaction to obtain a crude m-phenylenediamine solution. The crude m-phenylenediamine solution is then purified by distillation after removing methanol to obtain m-phenylenediamine. The entire process is continuous, and the obtained m-phenylenediamine yield is ≥98.5%, purity is ≥99.5%, and moisture content is ≤0.1%. The modified Raney Ni catalyst is a Mo-Co dual-auxiliary modified Raney Ni catalyst, which can be reused to reduce costs.

The application discloses an in-situ boron-doped porous framework cobalt catalyst and a preparation method and application thereof, and belongs to the technical field of porous materials and industrial catalysis. In the application, Co-Al alloy is used as a precursor, an aluminum phase is removed in an alkaline solution to form a porous framework, and a boron source (such as NaBH4) is introduced, so that the activity of high-energy-state cobalt atoms in the etching process is utilized to realize in-situ doping and amorphous modification of boron elements on the surface of the porous framework. The obtained catalyst has both the macroscopic framework structure of Raney cobalt and the microscopic electronic characteristics of amorphous cobalt boride. In the reaction of preparing hexamethylenediamine by hydrogenating adiponitrile, the unity of high conversion rate and high selectivity of hexamethylenediamine is realized under the condition of no additional alkali. The application effectively avoids the problems of equipment corrosion and waste liquid treatment caused by using liquid alkali in the traditional process, significantly reduces the production cost and environmental protection pressure, and provides an efficient and economical new way for the green and alkali-free industrial production of hexamethylenediamine.

The present invention provides a functional reactant based on an expandable carrier for reducing methane generated in soil, a fertilizer composition containing the same, and a method for producing the functional reactant. [Solution] A functional reaction substance based on an expandable carrier, comprising an expandable carrier and a functional substance contained in the carrier, wherein the expandable carrier is pre-expanded. [Effects] The functional reactant based on the expandable carrier of the present invention, and the fertilizer containing it, have an excellent effect in reducing methane generated in the soil. By raising the temperature of the carrier through the reaction of its components with water, the expandability of the carrier and the activation of the catalytically active metal are improved, maximizing the methane reduction effect. Furthermore, the settling and slow-release functions of the fertilizer are added to the soil, providing the advantage of maintaining the methane reduction function over a long period of time.

The present invention discloses the use of an innovative technology known as magnetic induction to carry out catalytic hydrogenation reactions using an unsupported multifunctional heterogeneous catalyst, such as Raney nickel, which can be heated in a controlled manner due to the action of an oscillating magnetic field. The invention relates to the use of Raney nickel as a bifunctional ferromagnetic material, which acts simultaneously as an active catalyst and a heating agent, offering an efficient, electrifiable and sustainable alternative to conventional thermal methods.

This invention discloses an efficient method for synthesizing 6-substituted indole. Using substituted nitrobenzene esters such as methyl 4-methyl-3-nitrobenzene as raw materials, a segmented temperature-controlled condensation reaction is carried out with DMF-DMA and tetrahydropyrrole in DMF solvent. The intermediate is directly subjected to Raney nickel-catalyzed hydrogenation reduction without separation and purification. The reducing solution is washed with hydrochloric acid, sodium bicarbonate aqueous solution, and sodium chloride aqueous solution, concentrated under reduced pressure, and distilled under reduced pressure. Recrystallization with n-heptane yields methyl 6-indolecarboxylate, which is then hydrolyzed with sodium hydroxide and acidified with hydrochloric acid to obtain high-purity 6-substituted indole. This invention achieves a one-pot continuous reaction of the intermediate, eliminating multiple intermediate purification steps. The reaction conditions are mild, requiring no high temperature, high pressure, or special equipment. The Raney nickel catalyst can be recycled, significantly shortening the production cycle, reducing production costs and waste emissions. The process is stable and controllable, safe and simple to operate, and suitable for large-scale industrial production.