ZSM-5/β core-shell molecular sieve and synthesis and use thereof

A ZSM-5/β core-shell molecular sieve, comprising a core comprising at least two crystal grains of ZSM-5 molecular sieve and a shell comprising a plurality of crystal grains of β molecular sieve, wherein:

• the at least two crystal grains of ZSM-5 molecular sieve have an average grain size of 0.05-15 μm,
• the ZSM-5/β core-shell molecular sieve has a shell coverage of 50-100% and a shell thickness of 10-2000 nm,
• an average grain size of the plurality of crystal grains of β molecular sieve in the shell is 10-500 nm,
• a ratio of a height of a diffraction peak at 2θ=22.4° to a height of a diffraction peak at 2θ=23.1° in an X-ray diffraction pattern of the ZSM-5/β core-shell molecular sieve is 0.1-10:1, and
• the ZSM-5/β core-shell molecular sieve has a total specific surface area of more than 420 m2/g, and a proportion of the specific surface area of pores having a pore diameter of 2-50 nm to a total specific surface area is 10-40%.