| abstract |
A catalyst for producing methyl methacrylate (MMA), and preparation method therefor and application thereof. The catalyst comprises a carrier and an active center supported on the carrier. The active center comprises gold, a transition metal, and a lanthanide metal. The carrier comprises SiO2, Al2O3, and one of an alkali metal or an alkali earth metal. The loading of the gold is 0.05-0.98 wt%, the loading of the lanthanide metal is 1-2.5 wt%, and the loading of the transition metal is 1-2.5 wt%. A polymer protection method is used as the preparation method and comprises: fully mixing a precursor of gold with a reductant and deionized water to obtain gold sol; sequentially adding the gold sol to a lanthanide metal and a transition metal; then adding a carrier; continuing to stir for 2-20 h and slowly rising the temperature to 65-85°C; after the stirring ends, lowering the temperature to the room temperature; and carrying out still standing, filtering, washing, drying, and roasting to obtain a catalyst. The catalyst is applied to a reaction for producing MMA, has excellent activity and stability, features low costs, high methacrolein conversion rate and MMA selectively, and is suitable for industrial production. |