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one is in the range of 150–250 °C, corresponding to the weak acid sites, and the other, i.e., the strong acid sites, reside in the range of 300–450 °C. After the introduction of Ga2O3, there is 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 decrease (Table S1). Figure 6. NH3-TPD profiles of x% Ga2O3/ZSM-5(x = 0, 0.1, 0.2, 0.3, 0.4). Figure 6. NH3-TPD profiles of x% Ga2O3/ZSM-5(x = 0, 0.1, 0.2, 0.3, 0.4). 2.2. Catalytic Preformances Before investigating the catalytic performance of Ga2O3/ZSM-5 hollow fibers, to check whether anoptimaBleinftorroediuncvinegstoifgGatai2nOg3othneZcSaMta-5lyetxiicstps,eGrfao2rOm3/ZanSMce-5ofcaGtal2yOsts3/wZitShMdi-f5fehreonlltoGwa2Ofib3leorasd,ing weretoevcahleucaktewd.hFeigthuerer 7anshopwtsimthaelcionntvroerdsuiocninogf no-fbGutanOe (Ao)n, yZieSlMd o-f5eetxhiesntes,aGnda pOrop/eZnSeM(B-)5, and 23 23 2.2. Catalytic Preformances yield of C2=, C3=, C4= plus BTX (C2=, C3=, C4= plus BTX refer to ethene, propene, butenes, butadiene and catalysts with different Ga2O3 loading were evaluated. Figure 7 shows the conversion benzene, toluene, xylene) (C) as a function of reaction temperature. From Figur=e 7, it=is app=arent that of n-butane (A), yield of ethene and propene (B), and yield of C2 , C3 , C4 plus BTX (C2=, C3=, C4= plus BTX refer to ethene, propene, butenes, butadiene and benzene, toluene, xylene) (C) as a function of reaction temperature. From Figure 7, it is apparent that with increase of the reaction temperature, the conversion of n-butane, the yield of ethene and propene and the yield of C2=, C3=, C4= plus BTX on all catalysts markedly increase. And at the same temperatrue, increasing the Ga2O3 loading results in the increase of the conversion and the yield of C2=, C3=, C4= plus BTX. As for the yield of ethene and propene, when the reaction temperature is lower than 600 ̋C, it increases with the increasing loading of Ga2O3, while when the temperature is above 625 ̋C, the yield of ethene and propene decreases with increasing the loading of Ga2O3. Such a result could be attributed to the synergistic effect of the dehydrogenation and aromatization properties of Ga2O3 [33] and the cracking function of ZSM-5. At lower temperatures, due to the dehydrogenation property, the presence of Ga2O3 contributes to the activation and dehydrogenation of n-butane. Hence n-butane may undergo dehydrogenation to produce butene, which is much easier to be converted than n-butane, and then, butene will undergo catalytic cracking reaction to produce ethene and propene as primary products. When temperature is above 625 ̋C, the produced ethene and propene will undergo oligomerization to produce higher olefins (C2–C9), and then, 183PDF Image | Zeolite Catalysis
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