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Citation: She Li-Qin, Wang Duo-Cai, Li Xuan-Wen, Liu Xing-Yun, Han Ming. The States of Zinc in ZnZSM-5 Zeolites and their Catalysis[J]. Acta Physico-Chimica Sinica, ;1994, 10(03): 247-253. doi: 10.3866/PKU.WHXB19940311 shu

The States of Zinc in ZnZSM-5 Zeolites and their Catalysis

1.
Department of Chemistry, Peking University, Beijing 100871; Department of Chemistry, Sichuan Normal College, Nanchong 637002

Received Date: 30 July 1992
Available Online: 15 March 1994

NH_3-TPD and pyridine adsorption IR spectroscopy techniques have been used to study the zinc states in ZnHZSM-5 zeolite containing various zine content. The results indicate that, in addition to two desorption peaks for HZSM-5 zeolite located at about 533 and 733 K, two new peaks located at about 573 and 873 K were observed. These new peaks are believed to be associated with two kinds of zinc sites designated by L_1, L_2. The adsorbed ammonia amount of L_2 corresponds to the amount of L_(1616) acid characterized by pyridine adsorption IR spectra for ZnHZSM-5 zeolite with various zinc contents. It is possible that there are two kinds of zinc states in ZnHZSM-5 zeolite. One kind of them is ZnO species with weak acidity, the other is ZnOH~+ species with strong acidity which can promote the activity and has an effect on stability of activity for aromatization of propane.
- ZnZSM-5,
- Propane,
- Aromatization,
- NH3-TPD,
- Pyridine adsorption IR spectra,
- Zeolite
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