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of LAS which accelerated the dehydrogenation of propane. However, the BTX selectivities remained, and the selectivities to propylene and butenes increased while the selectivity to ethylene decreased. It can be explained by two possible reasons. One possible reason would be related to the decrease in the amount of BAS (Figure 9B), which suppressed the secondary reactions of propylene and butenes. Another possible reason may be due to the strong increase in the mesopores after 0.2 M NaOH treatment (Table 2, Figure 5), which was beneficial to the diffusion of the formed olefins and the resultant lower amount of coke being formed (20 mg/g-catalyst at TOS of 210 min). This finding differed from our previous results on n-hexane cracking over alkali-treated H-ZSM-5 zeolites, in which the amount of coke used for alkali-treated catalyst was larger than that for the untreated one [20]. On the other hand, the selectivities to propylene and butenes in high n-hexane conversions were remarkably increased; however, those to ethylene and BTX were drastically decreased after 0.05 M NaOH treatment followed by acid treatment. These findings indicated that the secondary reactions to form BTX from propylene and butenes and the subsequent cracking reaction of butanes and/or propane to form ethylene could be further suppressed, due to the dramatic decrease in the number of acid sites, especially the LAS (Table 2, Figure 9). In addition, another possible reason would be related to the increase in the mesopores during the subsequent acid treatment (Table 2, Figure 5), which was beneficial to the diffusion of the formed olefins. 3. ExperimentalSection 3.1. Catalyst Preparation 3.1.1. Dealumination of H-Beta The H-Beta (Si/Al = 12) and H-Beta (Si/Al = 77) zeolites, denoted as HB(12) and HB(77), were supplied from the Catalysis Society of Japan and Sud-Chemie AG. Munchen, Germany, respectively. The HB(77) was used as the parent material and dealuminated by acid treatment. Specifically, 1 g HB(77) was suspended and stirred in a 1–2 M HNO3 (60%, Wako, Osaka, Japan) solution at 393 K for 1 or 16 h. The weight ratio of solid to liquid ratio was 1:30. The acid-treated HB samples were denoted as HB(77)-NT(a M, b h), where a and b were the HNO3 concentration and treatment time, respectively. 3.1.2. Desilication of H-Beta The HB(77) zeolite was used as the parent material and desilicated by alkali treatment. Specifically, 1 g HB(77) was suspended and stirred in a 0.05–0.2 M NaOH (97%, Wako, Osaka, Japan) solution at room temperature for 0.5 h. The weight 95PDF Image | Zeolite Catalysis
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