Characterization of short-time dealumined HZSM-5 zeolites |
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Authors: | Sattler Rita Rosmarie Einicke W-D Hunger B |
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Institution: | 1.Institut für Technische Chemie, Universit?t Leipzig, D-04103, Leipzig, Germany ;2.Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universit?t Leipzig, D-04103, Leipzig, Germany ; |
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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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | dealumination HZSM-5 zeolites NO adsorption non-framework aluminium TPD of water |
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