EWT molecular sieve as well as preparation method and application thereof

The invention discloses an EWT structure molecular sieve, which is characterized in that the ratio of skeleton aluminum to non-skeleton aluminum represented by nuclear magnetic carbon spectrum of the molecular sieve is greater than or equal to 3.0, and the ratio of B acid to L acid at 350 DEG C represented by pyridine infrared is greater than or equal to 0.22. The activity stability of the molecular sieve is improved, and the molecular sieve has better activity stability and ethylation product selectivity in the gas-phase alkylation reaction of benzene and ethylene. 本发明公开了一种EWT结构分子筛，其特征在于，该分子筛核磁碳谱表征的骨架铝与非骨架铝的比值≥3.0且吡啶红外表征的350℃的B酸与L酸的比例≥0.22。该分子筛活性稳定性提升，在苯与乙烯气相烷基化反应中具有更好的活性稳定性和乙基化产物选择性。