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Study on hydrophobic silylation modification of high silica molecular sieve ZSM-5

Li Cheng-long,LIU Cai-lin,YANG Hai-jun,REN Xian-yan,Lv Tie-yong(State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials,Southwest University of Science and Technology,Sichuan,Mianyang 621010,China)  
Hydrophobic modification of high silica molecular sieve ZSM-5 was studied,which is modified by triethoxyoctylsilane(OTS)in toluene.The structure and properties of samples were characterized by FT-IR,XRD,N2 adsorption-desorption,water static contact angle,static adsorption experiment of water and n-hexane,and hydrothermal stability experiment test before and after modification.Experimental results show that-Si(CH2)7CH3 groups grafted on ZSM-5 could effectively improve the hydrophobicity of molecular sieve.When 0.24g of modifying agent is applied to modify 0.8g of ZSM-5,the modified sieve shows a superhydrophobicity with a contact angle up to 152°.After hydrophobic modification,the water adsorption capacity,specific surface area,pore volume,and pore diameter of ZSM-5 fell by 1.49%,62.7 m2/g,0.0329 cm3/g,and 0.42 nm respectively,the long-term ordering of pore channel decreased slightly,and the hydrothermal stability was enhanced.
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