非临氢条件下流化催化裂化汽油降烯烃芳构化HZSM-5催化性能的研究

Olefin-reduction and aromatization performance of HZSM-5 catalysts for FCC gasoline nonhydrogenation upgrading

在非临氢条件下采用HZSM-5作为催化剂活性组元,研究了流化催化裂化(FCC)汽油芳构化降烯烃的反应性能.研究结果表明HZSM-5含量和其硅铝比对芳构化降烯烃反应具有重要影响,质量分数为30%以及硅铝摩尔比为58的HZSM-5催化剂的降烯烃和芳构化性能最佳,反映了其酸催化性能的适当的总酸量和合理的酸强度分布.反应温度和空速等主要工艺条件的研究结果表明,常压下反应温度以400℃左右为宜,空速可根据对烯烃和芳烃含量的限值在4～6 h-1内调整.FCC汽油经处理后的产物汽油烯烃体积分数可降低至8%～18%,相应的芳烃体积分数为42%～35%,道路法辛烷值不降低.

In a nonhydrogenating circumstance, the performance of hybrid catalysts with HZSM-5 as the active component for olefin reduction and aromatization of FCC gasoline was studied. The results show that the content and n （Si）： n （Al） of HZSM-5 displays great importance to the reaction. The catalyst 58ZSA containing HZSM-5 with 58 of n （Si） ： n （Al） and the proper mass ratio, 30%, shows excellent catalytic performance for FCC gasoline upgrading. It can be concluded that it has sufficient amounts of the total acid sites and the rational distribution in the acid strengths. Further study has revealed that the optimal reaction temperature is 400℃ , and the volume hourly space velocity can be 4 - 6 h^-1, adjusted according to the expected marginal value of olefins and aromatics. For the product gasoline, the olefins contents can be reduced to 8 % - 18 % of volume ratio, and the corresponding contents of aromatics increased to 42 % - 35 % of volume ratio. Moreover the road octane number of the product gasoline has no loss.