High-silicon ZSM-5 molecular sieve synthesized by in-situ crystallization of kaolin microspheres and preparation method of high-silicon ZSM-5 molecular sieve

The invention provides a high-silicon ZSM-5 molecular sieve synthesized by in-situ crystallization of kaolin microspheres and a preparation method of the high-silicon ZSM-5 molecular sieve. The preparation method comprises the following steps: mixing kaolin, a binder, a seed crystal and water, forming to obtain kaolin microspheres, roasting to obtain activated kaolin microspheres, at least mixing the activated kaolin microspheres, a silicon source, transition metal ions and a hydroxyl radical initiator, crystallizing, drying, and roasting to obtain the high-silicon ZSM-5 molecular sieve. The high-silicon ZSM-5 molecular sieve synthesized by in-situ crystallization of kaolin microspheres provided by the invention is prepared by the method. According to the method, kaolin is adopted as a raw material, and under the synergistic effect of transition metal ions and a hydroxyl radical initiator, the high-silicon ZSM-5 molecular sieve is obtained through in-situ crystallization under the condition that an organic te