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《Acta Physico-Chimica Sinica》 1985-06
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AN INFRARED SPECTROSCOPY METHOD FOR MEASURING THE BRONSTED ACID OF ZSM-5 AND THE STUDY OF SURFACE ACIDITY OF MODIFIED ZSM-5 ZEOLITES

Liu Xingyun She Liqin Li Xuanwen (Department of Chemistry,Peking University)  
Based on the studies of IR Spectra of various ZSM-5 zeolites it was found that there are two strong bands at ca.1875 and 2000 cm~(-1) and their absorbance ratio is a characteristic value.A method to treat the data of IR spectra by using relative absorbance with 2000cm~(-1) band as a “internal standard” has been develo- ped.The acidity of various ZSM-5 samples has been determined by this method and related to their concentrations of Br nsted acid measured by potential titration and activity of cumeue cracking.Good relationships have been found.The assign- ment of 1875 cm~(-1) and 2000 cm~(-1) bands has been discussed according to the experimental results.The theoretical base of this quantitive method for treating the IR spectra of ZSM-5 zeolite has been found by inferring the relation between relative absorbance and the concentration by the Beer-Lambert law.
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