Zeolites Y of FAU type containing different transition metal hetero-atoms(MY or M1M2Y,where M = Ti,Co,Ni,Mo,Zr,etc) in the framework were synthesized.The effect of different hetero-atoms on the crystallinity of zeolite Y was characterized by XRD and SEM.The zeolites MY or M1M2Y exhibit the same phase profiles as zeolite Y by XRD.SEM results showed that MY zeolite is provided with well-defined crystal and larger crystal size.Zeolite Y containing single transition metal hetero-atom(MY) exhibits lower crystallinity than zeolite Y.However,the zeolite Y containing two suitable hetero-atoms(M1M2Y) has a much higher crystallinity than MY due to the collaboration of M1 and M2;there is an optimum composition for two hetero-atoms to get a high crystallinity.
