Catalyst for preparing butanedioic anhydride through maleic anhydride hydrogenation and preparation method

The preparation method comprises the following steps: preparing a suspension from aluminum hydroxide, aluminum oxide, an alkaline auxiliary agent and deionized water, and performing liquid grinding, hydrothermal reaction, washing, filtering and drying to obtain powder A; preparing a binder solution B; placing the powder A in a rotary table of a ball rolling machine, spraying the solution B to the rotary table at the same time, rotating a rolling ball for forming, starting to add the powder A after the material forms particles, and continuously spraying the solution B at the same time until the raw material is formed into 2-5mm small balls; drying and roasting to obtain a product C; preparing an active metal solution D; impregnating the product C in the solution D in a saturated manner, drying, impregnating the dried product in the solution D in a saturated manner, drying, and roasting to obtain the catalyst. The catalyst is low in active component content, high in activity, good in selectivity and long in ser