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Figure 2. N2 sorption isotherms of (a) Hombikat, composites from mechanical mixture (HZMM) and zeolite ZSM-5; (b) Hombikat, composites from solid-state dispersion (HZSSD) and zeolite ZSM-5; (c) composites from sol-gel synthesis (TZSG) and TiO2; (d) calculated isotherms for the TiO2 fraction of the TZSG composites. For clarity, all isotherms in parts a to c were vertically displaced by 60 cm3 ̈ g ́1 except for the isotherms in part d, which were displaced by 80 cm3 ̈ g ́1 . In contrast to the materials from mechanical mixing and solid-state dispersion, the isotherms and, thus, the textural properties of the composites from sol-gel synthesis show no additivity based on the isotherms of the pure components. From the analysis of the isotherms in the low pressure range with the t-plot method (not shown), it becomes clear that the micropore volume of the zeolite ZSM-5 is not affected by the presence of the TiO2 from sol-gel synthesis. This means that the TiO2 particles exclusively reside outside the micropores of the zeolite. The deviations from additivity are, thus, caused by the changes in the mesopore range of the isotherms. In order to estimate the textural properties for the TiO2 component in the TZSG composites, isotherms were calculated from the ones shown in Figure 2c by subtracting the contribution of the zeolite ZSM-5 taking into account its mass fraction. 159PDF Image | Zeolite Catalysis
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