Acta Phys. -Chim. Sin. ›› 1990, Vol. 6 ›› Issue (02): 183-189.doi: 10.3866/PKU.WHXB19900211
• ARTICLE •
Xue Zhi-Yuan; Zhu Lei-Ming; Dai Lin-Sen
Acidity of La~(3+)-exchanged HY zeolite has been studied by the measurements of adsorption on the in-situ IR system and MAS-NMR method. The results show that: 1.The IR bands at 3631 and 3556 cm~(-1) are all assigned to hydroxyl group of strong acidic sites. The band at 3531 cm~(-1) is assigned to nonacidic hydroxyl group, since it has no interaction with ammonia. It is possible that two hydroxyl groups coor-dinate with one La~(3+) directly; the band at 3520 cm~(-1) is assigned to weak acidic hy-droxyl group, because it has weak interaction with ammonia, and one hydroxyl group may coordinate with one La~(3+) directly.2. The hydroxyl group at 3638 cm~(-1), which is in supercage of HY Zeolite, is of heterogeneity of actidity resulting from silicon atoms with different numbers of coordinated Aluminium.
Xue Zhi-Yuan; Zhu Lei-Ming; Dai Lin-Sen. Studies on Acidity of Anhydrous LaHY Zeolite by In-Situ IR and Mas-NMR Method[J].Acta Phys. -Chim. Sin., 1990, 6(02): 183-189.
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