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Preparation and Characterization of Amphiphilic HZSM-5 Zeolite with Various Si/Al Ratios

MA Bingli,CHUN Yuan~*,XU Qinhua,DONG Jialu(School of Chemistry and Chemical Engineering,Key Laboratory of Mesoscopic Chemistry of the Ministry of Education,Nanjing University,Nanjing 210093,Jiangsu,China)  
Amphiphilic HZSM-5 zeolite particles with Si/Al ratios of 25,42 and 101 were prepared by partial modification of the external surfaces of the HZSM-5 zeolite with trimethylchlorosilane.The amount of water added during the preparation influences the amphiphilic properties of the zeolites.The results of IR spectroscopy and N_2 adsorption indicate that these amphiphilic zeolite samples have the similar acidity and a little smaller surface area compared to their parent zeolites.In the phase-boundary reactions of cyclohexene hydration and isoamyl acetate hydrolysis,these amphiphilic zeolite particles are oriented at the aqueous-organic phase boundary and exhibit catalytic activity obviously superior to the parent zeolites.The amphiphilic HZSM-5 with a Si/Al ratio of 42 shows the best catalytic performance.Furthermore,the amphiphilic HZSM-5 is a more effective phase-boundary catalyst for the isoamyl acetate hydrolysis than for the cyclohexene hydration.
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