Titanium silicalite molecular sieve with hierarchical porous structure and its preparation and application

A titanium silicalite molecular sieve with a hierarchical porous structure, wherein the spectral peaks of the 1H MAS NMR spectrum of the titanium silicalite molecular sieve in the chemical shift range of 1-6 ppm are separated to obtain five spectral peaks whose chemical shifts corresponding to the peak positions are 1.8±0.1 ppm, 2.2 ppm±0.1 ppm, 2.8 ppm±0.1 ppm, 3.8±0.1 ppm and 4.6±0.1 ppm, respectively, wherein:

• the peak area of the spectral peak whose peak is at 1.8±0.1 ppm is recorded as A1, the peak area of the spectral peak whose peak is at 2.2 ppm±0.1 ppm is recorded as A2, the peak area of the spectral peak whose peak is at 2.8 ppm±0.1 ppm is recorded as A3, the peak area of the spectral peak whose peak is at 3.8±0.1 ppm is recorded as A4, and the peak area of the spectral peak whose peak is at 4.6±0.1 ppm is recorded as A5, then:
• X1 as defined by the following formula (1) is in the range of 0.5-2.2, preferably in the range of 0.6-1.8:
• X
• 1
• =
• (
• A
• 2
• +
• A
• 3
• )
• /
• A
• 1
• ;
• (
• 1
• )
• X2 as defined by the following formula (2) is in the range of 0.1-1.2, preferably in the range of 0.15-1.10:
• X
• 2
• =
• A
• 4
• /
• A
• 1
• ;
• (
• 2
• )
• X3 as defined by the following formula (3) is in the range of 0.05-0.65, preferably in the range of 0.10-0.55:
• X
• 3
• =
• A
• 5
• /
• A
• 1
• .
• (
• 3
• )