The reaction was carried out in a flow reactor (Ou Shisheng (Beijing) Technology Co., Ltd.). First, the flow reactor reaction tube was filled with magnets that could adsorb 100 mg of catalyst, and the reaction tube was maintained at a specific reaction temperature and H2 pressure. Then, the acetophenone reaction raw material with a concentration of 0.083 mol/L was replaced with gas. The mixed liquid was pumped into the reaction tube at a flow rate of 0.4ml/min, and the reacted mixed liquid flowed through the gas-liquid separator at a constant flow rate and entered the product collection device for gas phase and nuclear magnetic measurement. The reaction product was identified by GC and the yield of the reaction product was determined by GC, using 1,3,5-trimethoxybenzene as the internal standard.