▎ 摘　　要

NOVELTY - Preparing cerium-zirconium-potassium/reduced graphene oxide (CeZrK/rGO) nano solid solution catalyst comprises e.g. dissolving cerous nitrate, zirconyl nitrate and potassium nitrate in deionized water, generating a salt solution containing cerium ions, zirconium ions and potassium ions, adding graphene oxide and cerium ion, mixing graphene oxide and de-ionized water, after ultrasonic processing, generating graphene oxide solution, mixing two solutions, and then ultrasonically processing, heating the mixed solution in the step c in the water bath, adding the ammonia hydroxide to the mixed solution, hydro-thermal processing the solution, repeatedly centrifuging and washing the solution obtained in step f with deionized water until the pH of the solution, further freezing and drying the solution in a vacuum freeze drier to obtain the precursor. USE - The method is useful for preparing cerium-zirconium-potassium/reduced graphene oxide nano solid solution catalyst. ADVANTAGE - The method: is simple, easy to control and convenient for industrial production; produces the catalyst, which can simultaneously including high oxygen content, large specific surface area and good thermal stability. DETAILED DESCRIPTION - Preparing (cerium-zirconium-potassium/reduced graphene oxide (CeZrK/rGO) nano solid solution catalyst comprises (a) dissolving cerous nitrate, zirconyl nitrate and potassium nitrate in deionized water, generating a salt solution containing cerium ions, zirconium ions and potassium ions; (b) adding graphene oxide and cerium ion at the mass ratio of 5:1, mixing graphene oxide and de-ionized water, after ultrasonic processing, generating graphene oxide solution; (c) mixing two solutions prepared in the steps (a) and (b) and then ultrasonically processing; (d) heating the mixed solution in the step c in the water bath; (e) adding the ammonia hydroxide to the mixed solution in the step d until the pH of solution reaches to 10 plus minus 0.1; (f) hydro-thermal processing the solution obtained in step (e); (g) repeatedly centrifuging and washing the solution obtained in step f with deionized water until the pH of the solution is adjusted to be neutral; (h) further freezing and drying the solution obtained in step (g) in a vacuum freeze drier to obtain the precursor; and (i) under the argon atmosphere, calcining the precursor obtained in step h in a tubular furnace to obtain CeZrK/rGO nano solid solution catalyst and general formula of prepared CeZrK/ rGO nano solid solution catalyst is CeAZrBKC/rGO and in the general formula, A:B:C = 5:1-3:1-3.