Acid Modulation Fcc Catalyst And Hydrogen Ion Exchange

According to the characteristics of different materials, different modification methods were used to change the acidity of NaY zeolite, which is a kind of FCC catalyst. A series of modified NaY zeolites with different mounts of total acid, B acid and L acid were obtained. The results show that rare-earth can increase the amount of B acid, and has little influence on L acid. Phosphorus could significantly increase B acid and decrease L acid slightly. The introduction of a small amount of magnesium can decrease B acid and increase L acid, and there is little change in total acid amount.The ion exchange reaction of dilute HCl solution instead of ammonium salt solution with NaYzeolite were also researched, keeping the pH value in 3.3-3.5. In order to increase the hydrothermal stability of NaY zeolite exchanged with dilute HCl solution, hydrothermal ultra-stable treatment was operated during the calcination processes. The results show that the activity and hydrothermal stability of NaY zeolite exchanged with dilute HCl solution are both worse than those of NaY zeolite exchanged with NH4Cl solution. After 800℃,17h hydrothermal aging, the microreactor activity of NaY zeolite exchanged with HCl solution is 52.62%, and that of NaY zeolite exchanged with NH4Cl solution is 62.34%. And after 100% water vapor ultra-stable treatment, the microreactor activity of NaY zeolite exchanged with HCl solution is 52.24%, and 55.49% after water vapor and NH3 ultra-stable treatment. If soaked by the ammonia before being calcined, it's microreactor activity can reach to 57.59%.The results show that NH3 can improve the microreactor activity and hydrothermal stability of NaY zeolite.