新型MCM-22/MCM-41复合分子筛上FCC汽油降烯烃芳构化反应

采用纳米组装法合成MCM-22/MCM-41微孔/介孔复合分子筛，分别以H-MCM-22和H-MCM-22/MCM-41为催化剂，在固定床微反装置上对FCC汽油进行降烯烃芳构化的对比考察。结果表明，在反应时间2 h内,与MCM-22相比, MCM-22/MCM-41具有高的芳构化性能和持久的初始活性，复合分子筛汽油改质的产物中，芳烃体积分数由28.58%上升至51.1%，烯烃体积分数由34.04％降至5.8％。探讨了新型H-MCM-22/MCM-41复合分子筛用于FCC汽油改质的操作条件以及催化剂失活再生性能。结果表明,最佳反应条件为：反应温度400 ℃,压力2 MPa,空速3 h^-1。失活催化剂经过两次再生,降烯烃芳构化性能基本不变。

Olefins-reducing aromatization of FCC gasoline over MCM-22/MCM-41 catalysts

Micro-/mesoporous MCM-22/MCM-41 catalysts were synthesized by nano-assembling method. Behaviors of MCM-22 and MCM-22/MCM-41 catalysts for olefins-reducing aromatization of different FCC gasoline were investigated on a fixed bed reactor. The results for the newly-developed MCM-22/MCM-41 catalysts showed that after reaction for 2 h, olefins content in liquid product was reduced from 34.04% to 5.8% and aromatics content increased from 28.58% to 51.1%, which were superior to those of MCM- 22, with the optimal condition as follows：reaction temperature 400 ℃, reaction pressure 2 MPa, LHSV 3 h - 1. Deactivation and regeneration of the catalysts were studied and aromatization activity of H-MCM-22/ MCM-41 remained basically unchanged after one or two cycles of regeneration.