▎ 摘　　要

NOVELTY - Preparation method of supported nano metal catalyst comprises (i) mixing graphene oxide, aqueous solution containing metal ions with reducing agent, adjusting pH to 10-12, and then heating for hydrothermal reaction to obtain a catalyst precursor, where the metal ions include copper ions, cobalt ions and doped metal ions and the doped metal ion is a trivalent metal ion; and (ii) heating and calcining the catalyst precursor to obtain a supported nano metal catalyst. USE - The catalyst is useful in the reaction of preparing lower alcohols from synthesis gas (claimed). ADVANTAGE - The method improves the stability and product selectivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for (1) supported nano metal catalyst comprising a carrier and nano metal particles supported on the carrier, where the carrier is reduced graphene oxide, the nano metal particles include copper, cobalt and doped metals and doping metal is a metal element whose valence may be trivalent; and (2) use of supported nano-metal catalyst prepared as mentioned above in the reaction of preparing lower alcohols from synthesis gas.