Polystyrene sulfonic acid resin catalyst, preparation method therefor and use thereof

A polystyrene sulfonic acid resin catalyst and a preparation method therefor. The catalyst is separately used for performing dehydration of tertiary butyl alcohol (TBA) and isobutene oligomerization to cogenerate isobutene and diisobutylene (DIB). The catalyst comprises a polystyrene sulfonic acid resin, a metal, and a metal sulfate. The metal contains two parts: metal coated with the polystyrene sulfonic acid resin, and metal not coated with the polystyrene sulfonic acid resin. The metal sulfate is formed by converting the exposed surface of the metal not coated with the polystyrene sulfonic acid resin in the catalyst. When the catalyst is separately used in the dehydration of TBA and the isobutene oligomerization, due to the high thermal conductivity of the catalyst, the two reactions are coupled, thus supplementing energy required by the dehydration of TBA and greatly reducing the hot-spot temperature of the bed layer of the isobutene oligomerization. In the reaction, the conversion rate per pass of the dehydration of TBA may be 40% or more, and the selectivity of isbutene is 99% or more. Moreover, there is no need to add a sustained-release agent when the isobutene oligomerization is catalyzed, because even if isbutene with a concentration greater than 80 wt% is used as a raw material, the selectivity of DIB is still 80% or more, and the conversion rate per pass is 90% or more.