Abstract: EU-1/ZSM-5 composite zeolite was synthesized with organic template (TPABr and TPAOH) and EU-1 zeolite was used as aluminum source. As-synthesized sample was characterized by XRD, FT-IR and SEM-EDS. XRD results showed that EU-1 and ZSM-5 were coexisted in the composite zeolite；its pattern was similar with that of the mechanical mixture of EU-1 and ZSM-5. FT-IR spectra showed that characteristic absorption bands of the composite zeolite shifted to higher wavenumber, compared with the mechanical mixture of EU-1 and ZSM-5. N2 absorption and desorption isotherms of the sample showed that secondary mesoporous structure was observed in the composite zeolite. From the SEM images it can be seen that in composite zeolite tiny grains of nano-ZSM-5 crystal grew on the edges of EU-1 zeolite particles. EU-1/ZSM-5 composite zeolite with high crystallinity can be synthesized under the following conditions: m(EU-1)/m(SiO2)=1.1~1.4，n(OH-)/n (SiO2)=0.07~0.15，n(TPAOH)/n(TPABr)=1:9~5:5，crystallization temperature of 100～120 ℃ and crystallization time of 24~72 h.

Key words: EU-1, ZSM-5, composite molecular sieve, synthesis