Author： Sattler Rita Einicke W.-D. Hunger B.
Publisher： Springer Publishing Company
ISSN： 1388-6150
Source： Journal of Thermal Analysis and Calorimetry, Vol.76, Iss.3, 2004-06, pp. : 921-931
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Abstract
Temperature-programmed desorption (TPD) of water was applied to characterize short-time dealuminated HZSM-5 zeolites. Using a regularization method, distribution functions of the effective desorption energy of water were calculated. The results clearly show that during dealumination a new adsorption site is formed which can be attributed to non-framework or transient aluminium species. The highest concentration of these sites was observed for a dealumination time of 25-30 min. NO adsorption studies support this result. Furthermore, it could be concluded that the heterogeneity and the average acid strength of the remaining Si-OH-Al groups of the dealuminated samples do not change compared to the Si-OH-Al groups of the parent HZSM-5 zeolite.
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