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Si/Al ratio and microporous volume (Figures 1B and 5, Table 2). However, the repair of the defect sites did not increase its acid amount (Figure 7B, Table 2). In the region of pyridine ring stretching vibration (Figures 8B and 9B), all the HB samples exhibited the bands at 1542 and 1453 cm ́1, which are attributed to BAS and LAS, respectively [29]. Compared to the HB(12), the HB(77) had a smaller amount of acid sites especially the LAS. After acid treatment, both of the amounts of BAS and LAS were gradually decreased with an increase in the HNO3 concentration or treatment time. Moreover, the LAS were removed more readily than the BAS during the acid treatment [7]. Note that a new band around 1446 cm ́1 was observed for HB(77)-NT(2 M, 16 h). This band could be the pyridine molecules coordinated with the LAS and also interaction through the H bond with the BAS, this interaction causing a shift of the corresponding bands to lower frequencies [29]. Thus, it was concluded that both acid amount and acid type of HB(77) were changed after the acid treatment. After the NaOH treatment, the amount of BAS gradually decreased while that of the LAS gradually increased along with the NaOH concentration, indicating that dealumination occurred accompanied by desilication, and that the extra-framework Al atoms generated by the dealumination acted as the LAS. The similar results were also reported in our previous work on the desilication of ZSM-5 zeolite by alkali treatment [20]. However, the amount of LAS was drastically decreased after the subsequent HNO3 treatment for HB(77)-AT(0.05 M), suggesting that the LAS generated by alkali treatment were easily removed [20]. Moreover, both the amount of BAS and LAS gradually decreased with an increase in HNO3 concentration. Figure 8. IR spectra of HB(12) (a); HB(77) (b); HB(77)-NT(1 M, 1 h) (c); HB(77)-NT(2 M, 1 h) (d); and HB(77)-NT(2 M, 16 h) (e) catalysts before (A) and after (B) pyridine was absorbed and then desorbed at 423 K for 1 h. 86PDF Image | Zeolite Catalysis
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