FCC汽油降烯烃助剂的研究

The additives for reducing the olefins in the fluid catalytic cracking (FCC) gasoline were prepared by peptization. The effect of additives for reducing the olefins in the gasoline was evaluated in the micro reactor. The additive with the molar ratio of Mg and Al (n/n), 1∶1, had the best olefins reducing reaction activity. XRD result showed that MgAl2O4·MgO spinel was formed in the additive. Studied by Infrared Ray, it was found that the amount of total L acid decreased by adding the content of rare earth. Meanwhile the amounts of weak L acid and the total weak acid increased. Thereby，the hydrogen migration activity of FCC catalyst increased. When the content of the rare earth was 20%, the olefins reducing activity was 45.45%. Studied by XRD, it was thought that the effect of reducing the olefins of the FCC gasoline was the result of the cooperative efforts of MgAl2O4 and ReO2.