Ion-exchange of Ni2+ ions in siliceous ZSM-5

Tipo de material: Texto

TextoSeries ; Studies in surface Science and catalysis, 49, p.825-833, 1989Trabajos contenidos:

Den Ouden, C.J.J
Wielers, A.F.H
Kuipers, H.P.C.E
Vaarkamp, M
Mackay, M
Post, M.F.M

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Resumen: Ion exchange of Ni2+ and K+ ions in siliceous ZSM-5 with widely varying aluminium contents (20<Si/A1<250)has been studied. Whereas regardless of the aluminium content near-stoichiometric exchange can be achieved with the mono- valent K+ ions, only limited exchange is observed with the divalent Ni2+ ions With decreasing aluminium content the degree of Ni2+ exchange drops markedly. These results are interpreted using a model which relates the position of the extra framework Ni2+ ions to a specific configuration of the aluminium ions with regard to each other in the lattice.

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Ion exchange of Ni2+ and K+ ions in siliceous ZSM-5 with widely varying aluminium contents (20<Si/A1<250)has been studied. Whereas regardless of the aluminium content near-stoichiometric exchange can be achieved with the mono- valent K+ ions, only limited exchange is observed with the divalent Ni2+ ions With decreasing aluminium content the degree of Ni2+ exchange drops markedly. These results are interpreted using a model which relates the position of the extra framework Ni2+ ions to a specific configuration of the aluminium ions with regard to each other in the lattice.

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