EFFECT OF LOADING MODE OF La ON VANADIUM RESISTANCE PERFORMANCE OF Y ZEOLITE
Y2,Y3 and Y4 zeolite samples were prepared by loading the same content of rare earth La into Y zeolite via different methods,and the physicochemical properties and microactivity of Y zeolite samples were investigated systematically.The results showed that the La existed in ionic state in Y2 zeolite prepared by impregnation method,the La ions migrated into the internal structure of zeolites more easily during calcination,and most of them entered into the α-type supercage of zeolites;in the Y3 and Y4 zeolites prepared by precipitation method,La existed in non-ionic state and migrated less into the internal structure of zeolites during calcination.Compared with Y2 zeolite prepared by impregnation method,Y3 zeolite prepared by precipitation of La and oxalic acid first and then loading on the zeolite had better hydrothermal stability and activity,which indicated that the La present on the surface could improve the vanadium resistance of Y zeolite.
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