Preparation method of graded-pore macroporous-microporous ZSM-5 molecular sieve and product of graded-pore macroporous-microporous ZSM-5 molecular sieve

The invention discloses a preparation method of a hierarchical-pore macroporous-microporous ZSM-5 molecular sieve, which comprises the following steps: (1) uniformly mixing tetrapropylammonium hydroxide, sodium metaaluminate, sodium hydroxide, deionized water and absolute ethyl alcohol to obtain a silicon source treatment solution; putting the silicon oxide microspheres serving as a silicon source into the silicon source treating fluid for ultrasonic dispersion, and then drying at 40-60 DEG C to obtain dry gel; and (2) carrying out steam-assisted crystallization on the dry gel to obtain a solid product, then roasting to obtain a sodium type graded-pore macroporous-microporous ZSM-5 molecular sieve, and carrying out ammonium exchange to convert the sodium type graded-pore macroporous-microporous ZSM-5 molecular sieve into a hydrogen type graded-pore macroporous-microporous ZSM-5 molecular sieve catalyst. According to the method, the silicon oxide microspheres which are low in cost and can be massively synthesi