ZSM-5/Y复合分子筛在烃类催化裂化催化剂中的应用研究

以大庆减压蜡油为原料，考察了水热脱铝ZSM-5/Y复合分子筛的催化裂化性能，并与经同样条件水热脱铝的ZSM-5和Y型沸石的机械混合分子筛进行了对比研究。结果表明，与机械混合样品相比，复合分子筛具有较大的柴油产率和气体产率，汽油产率降低。从复合分子筛结构和ZSM-5的择形催化两方面分析了复合分子筛和机械混合分子筛裂化性能差别的原因。复合分子筛的聚集体结构不利于大分子进入分子筛结构中进行裂化，有利于汽油组分的裂化。气体数据分析支持了复合分子筛的结构特点。

Study on ZSM-5/Y composite zeolite for catalytic cracking of hydrocarbons

Catalytic performances of hydrothermal dealuminated ZSM-5/Y composite zeolite in the cracking of Daqing VGO were studied in comparison with the mechanical mixture of ZSM-5 and Y zeolite. The results showed that, compared with mechanical mixture, the composite zeolite gives higher diesel and gas yields, especially higher gas olefins such as ethylene, propylene and isobutene, and lower gasoline yield. The difference of gasoline and diesel yields between the composite and mechanical mixture was elucidated from the structure of composite zeolite and shape-selective catalysis of ZSM-5. The agglomerated structure of the composite zeolite was in favor of gasoline cracking, and prevented the larger hydrocarbon molecular component from entering into it and cracking. The analysis of gas composition (also) supported the structural characteristic of composite zeolite.