Catalyst for synthesizing poly (butylene succinate) through maleic anhydride hydrogenation as well as preparation method and application of catalyst

The invention provides a catalyst for synthesizing poly (butylene succinate) through maleic anhydride hydrogenation as well as a preparation method and application of the catalyst. The catalyst is composed of CuO, XO and Al2O3, X is one or more of Zn, Mg, Ca and Ba, the content of CuO is 30%-70%, the content of XO is 10%-50%, and the content of Al2O3 is 10%-40%. The catalyst is used for catalyzing maleic anhydride hydrogenation to synthesize poly (butylene succinate), the esterification reaction of succinic anhydride and 1, 4-butanediol can be realized in one step, low-molecular-weight poly (butylene succinate) is directly synthesized, and high-molecular-weight poly (butylene succinate) with the weight-average molecular weight of 30000-150000 is successfully synthesized by taking the low-molecular-weight poly (butylene succinate) as a raw material. By using the catalyst, the production cost of the poly (butylene succinate) (PBS) is remarkably reduced, the production process flow of the poly (butylene succinat