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adsorption-desorption measurement, the Brunauer-Emmett-Teller (BET) surface area of 377 m2/g and the pore volume of 0.275 cm3/g were determined. From Figure 5, it can be seen that the present isotherms exhibit a typical hysteresis loop at p/p0 > 0.1, indicating mesopores are formed, arising from the interparticle voids of Ga2O3/ZSM-5. Hence, the as-prepared Ga2O3/ZSM-5 hollow fibers exhibit a good hierarchical macro-meso-microporosity, with micropores in ZSM-5 nanoparticles, mesopores formed by the stacking of the Ga2O3/ZSM-5 nanoparticles, and continuous macropores on the hollow fibers. Catalysts 2016, 6, 13 5 of 12 Figure 5. Nitrogen adsorption-desorption isotherms and BJH pore size distribution (inset) of the 0.3% Figure 5. Nitrogen adsorption-desorption isotherms and BJH pore size distribution Ga2O3/ZSM-5 zeolite hollow fibers. (inset) of the 0.3% Ga2O3/ZSM-5 zeolite hollow fibers. The temperature-programmed desorption of ammonia (NH3-TPD) experiments were conducted to obtain tThheeacteidmicpperoaptuertei-epsrofgtrhaemams-perdepdaerseodrpGtai2oOn3/oZfSaMm-5m. Foingiuare(N6Hpre-sTePnDts)NeHxp3-eTrPimDepnrtosfiles of Ga2O3/ZSM-5. From Figure 6, it can be seen that there are two desorption group peaks for ZSM-5, were conducted to obtain the acidic properties of the as-prepared Ga2O3/ZSM-5. one is in the range of 150–250 °C, corresponding to the weak acid sites, and the other, i.e., the strong acid Figure 6 presents NH3-TPD profiles of Ga2O3/ZSM-5. From Figure 6, it can be sites, reside in the range of 300–450 °C. After the introduction of Ga2O3, there is no shift of the seen that there are two desorption group peaks for ZSM-5, one is in the range of diffraction peaks, indicating that the strength of acidic sites does not change. Among the samples, 150–250 ̋C, corresponding to the weak acid sites, and the other, i.e., the strong acid except 0.2% Ga2O3/ZSM-5, the amount of weak acid does not show apparent change, and only the sites, reside in the range of 300–450 ̋C. After the introduction of Ga O , there is amount of strong acid shows a slight decrease (Table S1). decrease (Table S1). 23 no shift of the diffraction peaks, indicating that the strength of acidic sites does not change. Among the samples, except 0.2% Ga2O3/ZSM-5, the amount of weak acid does not show apparent change, and only the amount of strong acid shows a slight 182 3PDF Image | Zeolite Catalysis
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