Catalyst for preparing dimethyl carbonate by using urea alcoholysis and preparation method thereof

The invention provides a catalyst for preparing dimethyl carbonate by using urea alcoholysis and a preparation method thereof. The catalyst has a specific surface area of 150-350 m/g, a specific pore volume of 0.5-2.0 cm/L and the pore-size distribution of 50-150, gamma-Al2O3 as a carrier accounts for 50-80 percentage of the catalyst by weight, and the balance comprises active constituents. The main active constituent comprises at least one of ZnO, CaO and PbO, and an active constituent oxide and an alumina carrier can form a stable spinelle structure. The catalyst has good stability, can achieve the stable operation service life longer than 500 hours, reacts with a urea methanol solution to synthesize the dimethyl carbonate with higher catalytic activity, has the simple preparation method, can finish load without special equipment, is beneficial to industrialized amplification, is a fixedly-carrier catalyst and solves the problem that the prior homogeneous catalyst is difficult to recycle.