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Ma, De-fu ; Gu, Shu-zhen and Yang, Rong-bin (Department of Chemical Engineering, Shanghai University of Engineering Science, Shanghai 200051 )  
he surface acidity of HZSM-5 zeolites is determined by Hammett indicator method, and is correlated with the catalytic activity for synthesis of n--butyl acetate in liquid phase. It is found that the acid sitessuch as - 5. 6H0≤- 3. 0 and --3. 0H0≤+3. 3 make a greater contribution to the catalytic esterification with contribution ratios of 48.3% and 33. 0% respectively. When the surface acid content is converted toavailable acid content according to its contribution ratio to catalytic reaction, the correlation between available acid content and reaction velocityconstant is in correspondence with the rule of homogeneous acid catalytic reaction. For the n--butyl acetate synthesis reaction in liquid phasewith HZSM--5 (St/A1= 60) as catalyst: k= 7. 17[C]4.25.
【CateGory Index】: O623.624.1
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