4results about How to "Regulatory distribution" patented technology

The application belongs to the technical field of solid oxide fuel cell anode catalyst, and particularly relates to a preparation of a multi-doped layered perovskite anode and application thereof in ammonia solid oxide fuel cells. x Ba 1–x Mn 1–y TM y O 3–δ (0.4<=x<=0.6, 0<=y<=0.3, TM=Co, Fe, Cu), the precursor is phase changed under a reducing atmosphere to form a PrBaMn2O 5+δ layered perovskite with rich oxygen vacancies, and the doped transition metal is precipitated in the form of an alloy and anchored on the surface of the layered perovskite. The anode catalyst has a simple synthesis method, low cost, rich and flexible adjustable element composition. The obtained anode catalyst is made into a slurry and then assembled into a solid oxide fuel cell single cell sheet. The solid oxide fuel cell prepared by the application has good power output, electrical conductivity and stability at medium and high temperatures.

The invention discloses a freeze-drying preparation method of second-phase particle dispersion nano tungsten-nickel-iron composite powder, which comprises the following steps: 1, adding rare earth nitrate, a salt solution and a surfactant into deionized water, and carrying out ultrasonic treatment to form a uniform precursor mixed solution; 2, performing freeze drying after pre-freezing treatment to obtain precursor powder; and thirdly, the precursor powder is subjected to calcination treatment and a two-step reduction process, and second-phase particle dispersion nanometer tungsten-nickel-iron composite powder is obtained. According to the preparation method, the precursor powder with the submicron particle size and highly concentrated particle size distribution is prepared by combining rapid pre-freezing with a freeze-drying process, and high-purity and high-uniformity compounding of tungsten-nickel-iron and second-phase particles is realized by combining subsequent calcination and reduction; the second-phase oxide particle dispersion nano tungsten-based composite powder with high purity and good uniformity is obtained, controllable preparation of superfine nano powder is achieved, and the method has good process amplification potential and is suitable for the field of powder preparation engineering.

The application discloses a method for recycling lithium in leaching solution of waste lithium ion battery and application thereof, and comprises the following steps: removing copper and iron aluminum from the leaching solution of the waste lithium ion battery to obtain a post-removing impurity solution; preparing a calcium sulfate solution; adding sodium fluoride, ammonium fluoride and a dispersing agent into the calcium sulfate solution; heating and reacting the obtained mixed solution; obtaining calcium-doped sodium fluoride crystals after cooling; adding the calcium-doped sodium fluoride crystals into the post-removing impurity solution; performing lithium precipitation under low-speed stirring; and performing solid-liquid separation to obtain lithium fluoride residue and post-lithium precipitation solution. The method uses calcium-doped sodium fluoride solid to precipitate lithium in the leaching solution at one time, so that the lithium in the leaching solution is enriched in the lithium fluoride residue, the recovery rate of the lithium is improved, the content of nickel, cobalt and manganese metals in the lithium fluoride residue is reduced, the difficulty in preparing battery-grade lithium carbonate from the lithium fluoride residue is reduced, and the subsequent treatment process of the nickel, cobalt and manganese metal solution is simplified.

The invention discloses a cobalt-based catalyst and a preparation method and application thereof. Comprising a cobalt element and an alkali metal element; the cobalt element exists in the form of a simple substance, cobalt oxide or cobalt carbide; the alkali metal element is selected from at least one of Li, Na, K, Rb and Cs; the alkali metal element exists in the form of a simple substance; in the cobalt-based catalyst, the total mass of the metal elements is 100 wt%, the content of the cobalt element is 50-99.5 wt%, and the balance is alkali metal elements. The catalyst has high activity and oxygen-containing compound selectivity in Fischer-Tropsch synthesis. The phenomenon of low selectivity of the oxygen-containing compound in Fischer-Tropsch synthesis is effectively solved, and an effective way is provided for improving the selectivity of the oxygen-containing compound.