FCC汽油在β沸石基催化剂上的非临氢降烯烃

Olefin reduction of FCC naphtha over β zeolite catalyst in the absence of hydrogen

以β沸石为载体、过渡金属为活性组分的大孔径分子筛作为催化剂,在反应温度140℃、反应压力3.6 MPa、体积空速1.5 h-1条件下,经过芳构化、异构化和氢转移反应,使汽油中φ(烯烃)≤35%,φ(苯)≤2.5%,φ(芳烃)≤40%,汽油辛烷值略有提高,达到国标要求。实验结果表明,该催化剂反应条件缓和,非加氢工艺流程简单,技术经济指标先进,成本低,效益高。

A macroporous zeolite catalyst for olefin-reducing of FCC naphtha was prepared using β zeolite as the carrier and transition metals as the active components. Influences of reaction temperature, reaction pressure, LHSV and catalysts regeneration on the olefin-reducing results were investigated, Olefins volumetric fraction of less than 35 %, benzene volumetric fraction of less than 2.5 % and aromatics volumetric fraction of less than 40% were obtained under optimum operation condition of 140℃, 3.6 MPa and LHSV 1.5 h^-1, after aromatization, isomerization and hydrogen transfer over the catalyst in the absence of hydrogen. Octane number of the product was slightly enhanced.