ZSM-5/Β CORE-SHELL MOLECULAR SIEVE AND SYNTHESIS AND USE THEREOF

摘要

Disclosed are a ZSM-5/β core-shell molecular sieve and the synthesis and use thereof. The molecular sieve comprises a core phase composed of at least two ZSM-5 molecular sieve grains and a shell layer composed of a plurality of β molecular sieve grains, wherein the ZSM-5 molecular sieve grains have an average grain size of 0.05-15 μm, the core-shell molecular sieve has a shell coverage of 50-100% and a shell thickness of 10-2000 nm, and the average grain size of the β molecular sieve grains in the shell is 10-500 nm. The ratio of the peak height of the diffraction peak at 2θ = 22.4° to the peak height of the diffraction peak at 2θ = 23.1° in the X-ray diffraction spectrum of the ZSM-5/β core-shell molecular sieve is 0.1-10 : 1. The ZSM-5/β core-shell molecular sieve has a good catalytic performance.