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catalyst weight to the n-hexane flow rate ratio (W/Fn-hexane) was varied from 12.8 to 64 g h/mol. The reaction products were analyzed with an on-line gas chromatography (GC-14B, Shimadzu, Kyoto, Japan) with an FID detector and a HP-AL/S column (30 m ˆ 0.535 mm ˆ 15 μm). The n-hexane conversion was calculated based on the peak area in the GC spectra before and after reaction. The selectivities to hydrocarbon products represent the products’ distribution and were calculated using area normalization method. Because hydrocarbons generally have molar response factors that are equal to number of carbon atoms in their molecule when using FID, the relative correction factors for different hydrocarbons are approximately 1.0 based on the carbon numbers. Coke amount was calculated by thermogravimetry analysis (TGA). The weight loss from 673 to 1073 K in each TG profile was defined as the contents of coke in the used catalyst. 4. Conclusions HB(77) exhibited higher catalytic stability and propylene selectivity than Al-rich HB(12), due to its smaller number of acid sites, especially the LAS. Dealumination of HB(77) by acid treatment improved catalytic stability and increased propylene selectivity in high n-hexane conversions. This may be attributed to the decrease in the number of acid sites, especially the LAS which accelerate the secondary reactions of propylene and butenes, the hydride transfer, and the resultant coke formation. On the other hand, the desilication of HB(77) by alkali treatment did not improve catalytic stability, although mesopores were formed. This may be related to the partially destroyed structure. However, alkali treatment increased propylene selectivity in high n-hexane conversions. Furthermore, alkali treatment followed by acid treatment improved catalytic stability and increased propylene selectivity in high n-hexane conversions. This may be due to the decrease in the number of acid sites and the increase in mesopores which are beneficial to the diffusion of coke precursor. Acknowledgments: This work was supported by the green sustainable chemistry project of New Energy and Industrial Technology Development Organization (NEDO). Author Contributions: The present work was conducted under the supervision of Seitaro Namba and Takashi Tatsumi. Toshiyuki Yokoi did the main research consulting and paper editing, and is named the correspondent author of the submitted work. Yong Wang did the experimental work and paper writing. Conflicts of Interest: The authors declare no conflict of interest. 97PDF Image | Zeolite Catalysis
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