Journal of the Chemical Society - Faraday Transactions p. 891 - 897 (1992)
Update date:2022-08-11
Topics:
Baba, Toshida
Kim, Geon Joong
Ono, Yoshio
Low-valent ytterbium or europium species were introduced into Y-zeolites by impregnation from ytterbium or europium metal dissolved in liquid ammonia.The zeolites thus loaded with ytterbium or europium have a high catalytic activity for the isomerization of but-1-ene at 273 K, when they were heated under vacuum at ca. 500 K.Their catalytic activities are strongly influenced by the alkali-metal cations present in the Y-zeolite.The isomerization proceeds via an allylic carbanion-type intermediate.On the other hand, the zeolites heated under vacuum around 900 K areactive for the hydrogenation of ethene at 273 K, and buta-1,3-diene at 323 K.The photoluminescence of europium supported on zeolites and temperature-programmed desorption spectra of gases desorbed from zeolites loaded with europium or ytterbium suggest that metal imides such as EuNH, and metal-like species may be formed by the zeolites under vacuum at ca. 500 and 900 K, respectively.
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