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Figure 14. Changes in products’ selectivities with n-hexane conversion on HB(77) (A); HB(77)-NT(1 M, 1 h) (B); HB(77)-NT(2 M, 1 h) (C); and HB(77)-NT(2 M, 16 h) (D) catalysts. Reaction conditions: see Figure 12. Products abbreviations: see Figure 11. 2.2.3. Comparison of HB(77), Alkali-Treated HB, and Alkali-Acid-Treated HB Catalysts Figure 15 shows the change in n-hexane conversion with TOS for the HB(77), alkali-treated, and alkali-acid-treated HB(77) catalysts at 923 K. Compared to the HB(77), HB-AT(0.05 M) and HB-AT(0.1 M) still showed a nearly 100% initial n-hexane conversion. However, the catalytic stability was not improved after these treatments. Note that HB(77)-AT(0.2 M) showed a slightly low initial n-hexane conversion of ca. 87% and a relatively slow deactivation rate (Figure 15A). On the other hand, the catalytic stability of alkali-treated HB(77) can be improved by subsequent HNO3 treatment, although the initial n-hexane conversion slightly decreased. For example, a slight decrease in n-hexane conversion from ca. 88% at TOS of 15 min to ca. 85% at TOS of 210 min was observed for HB-AT(0.05 M)-NT(1 M) (Figure 15B). Figure 16 shows the changes in products’ selectivities with n-hexane conversion for the HB(77), alkali-treated and alkali-acid-treated HB(77) catalysts. Compared to the HB(77) (Figure 16A), HB(77)-AT(0.05 M) showed a slightly higher propylene selectivity of ca. 36 C-% at the n-hexane conversion of nearly 100% (Figure 16B). Meanwhile, the HB-AT(0.05 M) also showed higher selectivities to BTX and lower selectivity to propane than the HB(77) in high n-hexane conversions. By increasing the NaOH concentration to 0.2 M, the selectivities to propylene and butenes in high n-hexane conversions were increased while the selectivities to ethylene and propane were decreased. The HB(77)-AT(0.2 M) showed a higher selectivity to propylene of ca. 40 C-% even with a high n-hexane conversion of ca. 97% (Figure 16C). On the other hand, when the HB(77) was treated by 0.05 M NaOH followed by HNO3 91PDF Image | Zeolite Catalysis
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