Mfi molecular sieve catalyst, preparation method therefor and use thereof

Abstract

Disclosed is an MFI molecular sieve. Each unit mass of the MFI molecular sieve includes coexisting monoclinic crystal form and orthorhombic crystal form of the MFI molecular sieve; and the MFI molecular sieve shows hydroxyl characteristic peaks at 3400-3500 cm−1 in the hydroxyl infrared spectrum thereof. The characteristic peaks have the highest point at a position between 3420-3480 cm−1, and the peak area of the one centering around the highest point and having a half-peak width of 210-240 is in a proportion of 70% or more of the total peak area. The MFI molecular sieve contains the elements Si, Al and O, and is free of the element Ti.

Dependencies are inferred from the claim text.