The reaction was carried out in a stainless-steel autoclave (Shanghai Yanzheng Instrument Co., Ltd.), which had a 10 mL well, a thermocouple, and a circulating watercooling device. A glass lining was placed in the well, which contained a 10 mm magnetic stir bar, 0.5 mmol acetophenone, 10 mg catalyst, and 6 mL solvent. Then, the autoclave was sealed and purged with H2 3 times under a pressure of 1 MPa, and pressurized with the set target H2 pressure. Put the autoclave into the heating mantle and set the stirring speed to 300 rpm. The autoclave was preheated from room temperature to the target temperature (the internal temperature detected by the thermocouple) at a rate of 2ºC•min -1 . The target temperature was used as the reaction temperature. The reaction was carried out at the reaction temperature for the required time. After the reaction, the autoclave was cooled to room temperature and the remaining gas was discharged. The reaction solution was collected with a dropper and filtered. The catalyst was fixed on a magnetic stir bar and washed thoroughly with ethanol and water. Then used a freeze dryer to dry the catalyst (together with a magnetic stir bar) under vacuum at -48 ºC for 12 hours. The reaction product was identified by GC, and the yield of the reaction product was determined by GC, using 1,3,5trimethoxybenzene as the internal standard.