▎ 摘　　要

NOVELTY - Graphene/copper (Cu)-manganese (Mn)-cerium (Ce) composite catalyst comprises graphene as carrier loaded with Cu-Mn-Ce composite oxide. USE - Graphene/copper (Cu)-manganese (Mn)-cerium (Ce) composite catalyst. ADVANTAGE - The catalyst has low temperature activity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite catalyst comprising ultrasonically adding graphite oxide with water, stirring uniformly, adding cerium nitrate, ethanol and acetic acid to obtain mixture, heating and separating to obtain precipitate; adding alkali liquid to precipitate, heating, adding dilute acid to neutralize, washing, filtering, and drying to obtain solid; mixing solid, potassium permanganate, manganese nitrate and copper nitrate, forming mixture, adding water, stirring, dissolving, heating solution, filtering, washing, drying and sintering to obtain the composite catalyst.