High-silicon FAU molecular sieve with high-proportion exposed acid site as well as preparation method and application of high-silicon FAU molecular sieve

The invention relates to a high-silicon FAU molecular sieve with a high-proportion exposed acid site, and a microstructure assembly preparation method and application of the high-silicon FAU molecular sieve. The molecular sieve adsorbent has an FAU molecular sieve configuration, and the molar ratio of chemical components of the molecular sieve adsorbent is Al2O3: mSiO2: nM2O. The element composition contains more tetravalent element Si and less trivalent element Al, and the molar ratio (m = SiO2/Al2O3) of the oxide is 5-20. According to the molecular sieve, crown ether, alkali, water, a silicon source and an aluminum source are blended into initial gel, the charge density of a double-template agent is adjusted, different cage structures of the FAU molecular sieve are assembled for synthesis, and meanwhile, regulation and control of the exposed acid site proportion are realized. Compared with commercial molecular sieves such as Beta, NaY and the like, the high-silicon FAU molecular sieve with the high-proporti