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Citation: 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 Physico-Chimica Sinica, ;1990, 6(02): 183-189. doi: 10.3866/PKU.WHXB19900211 shu

Studies on Acidity of Anhydrous LaHY Zeolite by In-Situ IR and Mas-NMR Method

1.
Center of Analysis and Measurement, Fudan University, Shanghai

Received Date: 4 October 1988
Available Online: 15 April 1990

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.
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