Light hydrocarbon cracking C2 fraction selective hydrogenation catalyst and preparation method thereof

The invention provides a light hydrocarbon cracking C2 fraction selective hydrogenation catalyst and a preparation method thereof. The catalyst comprises a carrier and active components, the carrier is a phosphorus-doped carbon material, the active components comprise a main active component and an auxiliary active component, the main active component comprises Pd, the auxiliary active component comprises Au, and the main active component and the auxiliary active component are dispersed on the carrier in an atomic scale. The preparation method of the catalyst comprises the following steps: mixing a phosphorus-containing compound and carbohydrate in water, carrying out hydrothermal reaction, and at least drying and calcining to obtain a phosphorus-doped carbon material carrier; loading the active component on the phosphorus-doped carbon material carrier to obtain a catalyst semi-finished product; and reducing the semi-finished product of the catalyst to obtain a reduced catalyst, namely the selective hydrogena