2 results about "Cobaltite" patented technology

The application belongs to the field of environmental catalysis technology, and relates to a preparation method of low-temperature high-crystalline samarium calcium cobaltite perovskite oxide and application of the low-temperature high-crystalline samarium calcium cobaltite perovskite oxide in catalytic oxidation of toluene. The preparation method comprises the following steps: step 1, dissolving samarium nitrate hexahydrate and cobalt acetate tetrahydrate in water to obtain a first solution, and dissolving citric acid monohydrate and urea in water to obtain a second solution; step 2, under the condition of stirring at room temperature, the second solution is added dropwise into the first solution to obtain a mixed metal salt solution; step 3, the mixed metal salt solution is heated to a preset temperature and stirred until a transparent wet gel is generated; step 4, the transparent wet gel is dried to obtain a foamed dry gel; and step 5, the foamed dry gel is ground into a powder, and the powder is calcined under an air atmosphere to obtain a powder solid phase. The low-temperature high-crystalline samarium calcium cobaltite perovskite oxide prepared by the application has the advantages of low energy consumption, low cost, large specific surface area, high crystallinity, high catalytic activity, good stability and strong water resistance.

A method for preparing a bimetallic stacked barrier layer with adjustable thermal expansion coefficient and improved stability is disclosed, relating to the field of thermoelectric device technology. The method includes the following steps: Nb and Cu metal foils are stacked alternately to form a multilayer stacked structure, and interfacial bonding is performed via diffusion bonding to obtain an Nb-Cu barrier layer; raw materials are weighed according to the atomic ratios of n-type and p-type cobaltite thermoelectric materials, and the prepared raw materials are vacuum melted to obtain n-type and p-type cobaltite ingots, respectively; the n-type and p-type cobaltite ingots are respectively subjected to melt spinning treatment to obtain corresponding n-type and p-type cobaltite powders; the obtained barrier layer and cobaltite powder are placed together in a mold, with the barrier layer located at the bottom of the mold and the n-type or p-type cobaltite powder placed on top of the barrier layer; after flattening, hot-pressing sintering is performed, followed by furnace cooling to obtain an n-type or p-type cobaltite thermoelectric material with a barrier layer on its surface.