Penniform large-grain cerium-based composite oxide powder with high specific surface area and preparation method thereof

Abstract

The invention relates to penniform large-grain cerium-based composite oxide powder with high specific surface area and a preparation method thereof. The preparation method comprises the following steps of: dripping a mixed solution of cerium-based salt and non-cerium-based salt (one or more of nitrates or sulfates of samarium, gadolinium, neodymium, yttrium, zirconium, lanthanum, barium, calcium and strontium) to a precipitant solution at 30-60 DEG C under stirring; keeping the pH of a reaction solution at 8-12, wherein the mole ratio of metal ions to a precipitant is 1: (2-6); carrying out aging reaction on the reaction solution at 60-80 DEG C for 6-20 hours to obtain precipitates; filtering and washing till filter liquor is neutral; drying the precipitates at 60-120 DEG C for 6-20 hours, and then calcining at 400-1100 DEG C for 4-20 hours to prepare the penniform large-grain cerium-based composite oxide powder. The products are grains which have good dispersity and uniform size; the grains are irregularly connected together through a large quantity of nano-plates and form penniform shapes; the average grain diameter of the grains is 1-20 micrometers; the specific surface area of the grains is 70-90 m<2>/g; and the thicknesses of the nano-plates are 20-100 nanometers.

Description

Technical field [0001] The invention belongs to the technical field of rare earth element oxides, and relates to composite crystals doped with rare earth elements and alkaline earth metal oxides with cerium as the main body and a preparation method thereof. Background technique [0002] The development and utilization of rare earth resources has an inestimable role and a special strategic position in today's economic development, and it also plays an increasingly important role in the development of the national economy. my country's rare earth resources are very rich, and its industrial reserves are the largest in the world, providing unique advantages for the development of my country's rare earth industry. The cerium-based oxide material accounts for about 50% of the proven reserves. Cerium-based oxide powder materials have important applications in the field of catalysis, medium temperature solid oxide batteries, and chemical mechanical polishing and grinding. The research a...

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Problems solved by technology

[0004] From the current reports, it can be seen that the acquisition of high specific surface area materials by common wet chemical methods is mainly achieved by obtaining nanoparticles, and their morphology cannot be controlled; while using hydrothermal or solvothermal synthesis techniques to control particle morphology, high temperature must be used. High-pressure equipment and harsh reaction conditions restrict the application of many existing technologies in industrial production

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