Method for producing substituted aromatic hydrocarbon through gas phase alkylation and catalyst thereof

The invention discloses a method for producing substituted aromatic hydrocarbon through gas phase alkylation and a catalyst thereof. According to the method, aromatic hydrocarbon and olefin are used as raw materials and are subjected to contact reaction with a catalyst to generate substituted aromatic hydrocarbon. The catalyst is a silicon-aluminum molecular sieve catalyst, a molecular sieve crystal in the catalyst contains cubic cavities with three size distributions, and the area distribution ranges of rectangles corresponding to vertical projections of the three cubic cavities from top to bottom are respectively within 20-100 nm < 2 >, 200-1200 nm < 2 > and 1500-3000 nm < 2 >. The method provided by the invention can effectively improve the diffusion velocity of reaction molecules, improve the conversion rate and the selectivity of the target product, and prolong the service life of the catalyst. 本发明公开了一种气相烷基化生产取代芳烃的方法及其催化剂。该方法是以芳烃和烯烃为原料，通过与催化剂接触反应生成取代芳烃。所述催化剂为硅铝分子筛催化剂，催化剂中分子筛晶体内部含有3种尺寸分布的立方体空腔，此3种立方体空腔从上至