Method for preparing metal nano-catalyst with assistance of deep eutectic solvent and application of metal nano-catalyst

The invention discloses a method for preparing a metal nano-catalyst with the assistance of a deep eutectic solvent, which comprises the following steps: adding Co salt and L-alanine into N, N-dimethylformamide, reacting at 130-150 DEG C for 3-5 hours, naturally cooling to room temperature, carrying out solid-liquid separation, washing the solid with N, N-dimethylformamide, and carrying out vacuum drying to obtain a Co complex; the preparation method comprises the following steps: adding Ce salt and L-alanine into glycerol, and uniformly mixing to obtain a Ce-based eutectic solvent; the preparation method comprises the following steps: in an inert atmosphere, mixing a Co complex with a Ce-based eutectic solvent, carrying out high-temperature pyrolysis at 500-700 DEG C for 2-4 hours, and cooling to room temperature, so as to obtain the metal nano-catalyst, compared with the prior art, the method has the advantages of cheap raw materials, simple preparation and easy recycling, the catalyst is used for preparing