Catalyst system and preparation method and application thereof

The invention provides a catalyst system and a preparation method and application thereof, the catalyst system comprises a fluorinated-alumina catalyst and an auxiliary agent which are arranged in a form of alternating layers, and the content of impurity metal elements in the fluorinated-alumina catalyst and the auxiliary agent is kept at an extremely low level. The first impurity metal elements comprise alkali metal, alkaline earth metal, chromium, titanium, tungsten, tin, vanadium, iron, copper, silver, zirconium and zinc. The catalyst system disclosed by the invention has extremely low impurity metal content and an alternate layered arrangement mode, so that excellent raw material conversion rate, product selectivity, reaction stability, catalyst service life and excellent reaction system temperature control are realized. 本发明提供了一种催化剂体系及其制备方法和应用，该催化剂体系包括以交替的层的形式设置的氟化-氧化铝催化剂和助剂，并且此二者中的杂质金属元素含量均保持在极低的水平，所述第一杂质金属元素包括：碱金属、碱土金属、铬、钛、钨、锡、钒、铁、铜、银、锆和锌。本发明的催化剂体系由于具有极低的杂质金属含量和交替层状设置方式，实现了极佳的原料转化率、产物选择性、反应稳定性、催化剂寿命以及优异