▎ 摘　　要

NOVELTY - An ammonia oxidation catalyst is prepared by adding high valence state manganese precursor into deionized water, stirring and dissolving to obtain solution A, adding low valence state manganese precursor into deionized water, stirring and dissolving to obtain solution B, adding metal precursor into deionized water, stirring and dissolving to obtain solution C, adding solution B into solution A under stirring condition, stirring at room temperature for 0.5-2 hours, continuously adding solution C, continuously stirring at room temperature for 0.5-2 hours to obtain mixed solution, adding alkaline solution, stirring at room temperature for 5-24 hours, transferring to crystallization kettle with PTFE lining for high temperature crystallization, opening kettle, filtering crystallized solution, washing, drying and roasting. USE - The method is used for preparing ammonia oxidation catalyst used for synthesizing methacrylonitrile (claimed). ADVANTAGE - The method has simple technique, mild reaction condition and high product yield. DETAILED DESCRIPTION - An ammonia oxidation catalyst used for synthesizing methacrylonitrile, is prepared by adding high valence state manganese precursor into deionized water, stirring and dissolving to obtain solution A, adding low valence state manganese precursor into deionized water, stirring and dissolving to obtain solution B, adding metal precursor into deionized water, stirring and dissolving to obtain solution C, adding solution B into solution A under stirring condition, stirring at room temperature for 0.5-2 hours, continuously adding solution C, continuously stirring at room temperature for 0.5-2 hours to obtain mixed solution, adding alkaline solution, stirring at room temperature for 5-24 hours, transferring to crystallization kettle with PTFE lining for high temperature crystallization, opening kettle, filtering crystallized solution, washing, drying and roasting. The metal precursor is iron precursor, cerium precursor, nickel precursor, copper precursor or molybdenum precursor. The molar ratio of high valence state manganese precursor, low valence state manganese precursor and metal precursor is 1:0.5-3:0.05-2. The molar ratio of all metal elements and alkali is 1:1-15.