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chose Ga2O3 as the dehydrogenation component and introduced it into the ZSM-5 nanocrystals to fabricate Ga2O3/ZSM-5 hollow fiber based bifunctional catalysts. The physicochemical features of as-prepared catalysts were characterized by means of XRD, BET, SEM, STEM, NH3-TPD, etc., and their performance for the catalytic conversion of n-butane to produce light olefins and aromatics were investigated. 2. ResultsandDiscussion 2.1. Catalyst Characterization Figure 1 shows the XRD patterns of the as-synthesized catalysts. From Figure 1 the characteristic diffraction peaks of ZSM-5 could be seen, showing that the catalysts are typical of MFI topology and the introduction of gallium on ZSM-5 does not change the crystalline structure of ZSM-5. No obvious diffraction peaks corresponding to gallium species are observed in the XRD patterns of Ga/ZSM-5, indicating that gallium species may be well dispersed on the surface of ZSM-5 zeolite [31] or the amount of them is too low to show obvious diffraction peak. According to the Ga 2p3/2 XPS spectra (Figure 2), the Ga 2p3/2 binding energy value (BEs) for the as-prepared Ga/ZSM-5 (1118.3 eV) is consistent with that for Ga2O3, indicating that the gallium exists on the surface of ZSM-5 in the form of Ga2O3. In comparison with that of the single bulk Ga2O3, the broadening of the half peak width of Ga 2p3/2 of the as-prepared Ga2O3/ZSM-5 occurs, which is connected with the increase of the Catalysts 2016, 6, 13 3 of 12 Figure 1. XRD patterns of the as-synthesized Ga2O3/ZSM-5 and Nano-ZSM-5. Figure 1. XRD patterns of the as-synthesized Ga2O3/ZSM-5 and Nano-ZSM-5. Ga dispersion [32]. 179PDF Image | Zeolite Catalysis
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