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The effect of framework aluminum on the dissolution behavior of ZSM-5 zeolite crystal was systematically studied using an interferometric technique. We succeeded in the three-dimensional measurement of the dissolution rates of aluminum-containing ZSM-5 zeolite crystal, namely the (010) face of ZSM-5 zeolite crystal as well as the (100) and (001) faces. The dissolution rate was dependent strongly...
To clarify the influence of the crystallinity (structure defect) of zeolites on dealumination behavior, HZSM-5 zeolites synthesized using 1-BuOH and TPABr were dealuminated under a hydrothermal atmosphere. It was found that the dealumination rate of the HZSM-5 zeolite has apparently a third-order dependence upon the number of framework aluminums in the zeolite structure and that, in the case of the...
Adsorption isotherms of water were measured at 25 o C for HZSM-5 zeolites with variousSiO 22 O 3 ratios. From the analysis of the adsorption isotherms by the D-R method it was found that the micropore volume W o (H 2 O) accessible to water molecules increases linearly with an increase in the framework aluminums and that the number of water molecules associated...
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