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Resumen de: WO2023201710A1

An intermetallic compound which is rich in Al or Zn and is doped with noble metal elements by means of solid solution is used as a precursor, and said compound reacts with an alkali solution near the boiling point temperature of the alkali solution under normal pressure, so that normal pressure and efficient preparation of a nano metal oxide doped with the noble metal nanoparticles having different crystallinity are achieved. Meanwhile, on the basis of the nano metal oxide doped with the noble metal nanoparticles, further provided is a preparation method for the noble metal nanoparticles. The preparation methods have the characteristics of simple process, easy operation, high efficiency and low cost. The prepared product can be widely applied to the fields of composite materials, catalytic materials, ceramic materials, refractory materials, advanced electronic materials, battery materials, color-changing materials, wave-absorbing materials, wastewater degradation materials, sterilization materials, coatings, pigments, thermal spraying materials and sensors.