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  Competitive ion exchange of transition metals in low silica zeolites

Weidenthaler, C., Mao, Y., & Schmidt, W. (2002). Competitive ion exchange of transition metals in low silica zeolites. In R. Aiello, G. Giordano, & F. Testa (Eds.), Studies in Surface Science and Catalysis (pp. 1857-1864). Amsterdam: Elsevier.

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 Creators:
Weidenthaler, Claudia1, Author              
Mao, Y.1, Author              
Schmidt, Wolfgang1, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              

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 Abstract: Ternary ion exchange experiments were performed on the zeolites Na-A, Na/K-X, and Na-Y using Mn2+/Ni2+, Mn2+/Co2+, and Ni2+/Co2+ mixtures as exchange solutions. The different zeolites show distinct preferences for specific transition metal cations, e.g. zeolite A and X prefer Mn2+ over Co2+ and/or Ni2+. The reason for that are the different hydration energies of the cations which have to be applied for the stripping of water molecules from the hydration shell of the cations and changes of the coordination of the cations by the different zeolite frameworks. After repeated ion exchanges, a significant over exchange is observed for all systems, which is especially pronounced at elevated temperatures. That effect is more distinctive for the low silica zeolites A and X but also observed for zeolite Y. The cation exchange conditions have a significant influence on the thermal stability of the zeolites A and X. However, due to the slightly higher pH values of the Mn2+ containing ternary ion exchange solutions, the stability of these zeolites are significant higher compared to those exchanged in ion exchange system containing only Co2+ and/or Ni2+.

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Language(s): eng - English
 Dates: 2002
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: -
 Degree: -

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Title: Impact of Zeolites and other Porous Materials on the New Technologies at the Beginning of the New Millenium, 2nd International FEZA (Federation of the European Zeolite Associations) Conference
Place of Event: Taormina, Italy
Start-/End Date: 2002-09-01 - 2002-09-05

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Title: Studies in Surface Science and Catalysis
  Abbreviation : Stud. Surf. Sci. Catal.
Source Genre: Proceedings
 Creator(s):
Aiello, Rosario1, Editor
Giordano, Girolamo1, Editor
Testa, Flaviano1, Editor
Affiliations:
1 Dipartimento di Ingegneria chimica e dei materiali, Università della Calabria, Via Pietro Bucci, 87030 Rende, CS, Italy, ou_persistent22            
Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 142 Sequence Number: - Start / End Page: 1857 - 1864 Identifier: ISSN: 0167-2991
CoNE: https://pure.mpg.de/cone/journals/resource/954926964942_2