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《Journal of Beijing University of Chemical Technology》 2003-06
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The effect of dealumination of β zeolite with HCl on its structure and catalytic activity

Liu Ai quan Ma Li jing Yuan Liang jing (College of Science, Beijing University of Chemical Technology, Beijing 100029, China)  
Hβ zeolite and β samples dealuminated with HCl solution were investigated by IR and titration with n butylamine. It can be proved from IR that non framework Al and intermediate Al are mainly eliminated by diluted HCl, and in addition, framework Al of H β zeolite can also be eliminated by HCl in higher concentration. The results of titration with n butylamine show that the total amount of surface acidity of H β zeolite decreases lineally with the increase in concentration of HCl in some extent, from which the content of framework Al and non framework Al can be calculated and the dependence of acidity amount in dealuminated H β zeolite on its acid strength can be determined. In order to test the catalytic activity of H β zeolite dealuminated with HCl, the effect of the dealumination process on the reaction activity of o xylene isomerisation was also investigated by a micropulse reaction. It is found that the catalytic activity has the maximum value when the corresponding concentration of HCl approximates to 0 04?mol/L.
【CateGory Index】: O643.3
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