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increases with the increasing loading of Ga O , while when the temperature is above 625 °C, the yield 23 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 C7–C9 alkylcyclohexenes would be formed by cyclization and dehydrogenation. may undergo dehydrogenation to produce butene, which is much easier to be converted than n-butane, Finally, C7–C9 alkylcyclohexenes are converted to corresponding aromatics [34]. and then, butene will undergo catalytic cracking reaction to produce ethene and propene as primary Thus, although the increase of the yield of ethene and propene flattens out with products. When temperature is above 625 °C, the produced ethene and propene will undergo the increase of the temperature, the generation of the benzene, toluene, and xylene oligomerization to produce higher olefins (C2–C9), and then, C7–C9 alkylcyclohexenes would be results in the yield of C =, C =, C = plus BTX continuing to increase. From Figure 7, 234 formed by cyclization and dehydrogenation. Finally, C7–C9 alkylcyclohexenes are converted to itiscanbeseenthatwhentheGaO loadingamountisabove0.3%,theenhancing 23 corresponding aromatics [34]. Thus, although the increase of the yield of ethene and propene flattens capacity of the conversion of n-butane and the yield of C =, C =, C = plus BTX is 234 out with the increase of the temperature, the generation of the benzene, toluene, and xylene results not obvious. According to the literature [35], one possible explanation is that a very in the yield of C2=, C3=, C4= plus BTX continuing to increase. From Figure 7, it is can be seen that when small amount of gallium is sufficient to cause a marked enhancement in the activity the Ga2O3 loading amount is above 0.3%, the enhancing capacity of the conversion of n-butane and of ZSM-5, and too much gallium loading will lead to excessive dehydrogenation and the yield of C2=, C3=, C4= plus BTX is not obvious. According to the literature [35], one possible secondary reaction, resulting in no beneficial improvement in catalytic conversion of explanation is that a very small amount of gallium is sufficient to cause a marked enhancement in the n-butane. In addition, according to the NH -TPD results (Figure 6), the introduction 3 activity of ZSM-5, and too much gallium loading will lead to excessive dehydrogenation and ofGaO slightlydecreasedtheamountofstrongacidofZSM-5,sowiththeincrease 23 secondary reaction, resulting in no beneficial improvement in catalytic conversion of n-butane. In of the Ga O loading, the decreased acidity property results in the decrease of 23 addition, according to the NH3-TPD results (Figure 6), the introduction of Ga2O3 slightly decreased cracking performance. The present result indicates that excellent catalytic activity the amount of strong acid of ZSM-5, so with the increase of the Ga2O3 loading, the decreased acidity could be obtained by regulating of the Ga O , leading to a good balance between 23 property results in the decrease of cracking performance. The present result indicates that excellent thedehydrogenationofGaO andthecrackingfunctionofZSM-5.Giventhat0.3% 23 catalytic activity could be obtained by regulating of the Ga2O3, leading to a good balance between the Ga O /ZSM-5 was chosen as building blocks for the preparation of Ga O /ZSM-5 23 23 dehydrogenation of Ga2O3 and the cracking function of ZSM-5. Given that 0.3% Ga2O3/ZSM-5 was hollow fibers via coaxial electrospinning, and their catalytic conversion of n-butane chosen as building blocks for the preparation of Ga2O3/ZSM-5 hollow fibers via coaxial electrospinning, into light olefins and aromatics was further investigated. and their catalytic conversion of n-butane into light olefins and aromatics was further investigated. (A) Figure 7. Cont. 184PDF Image | Zeolite Catalysis
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