Numéro
J. Phys. IV France
Volume 03, Numéro C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
Page(s) C4-197 - C4-200
DOI http://dx.doi.org/10.1051/jp4:1993427
4th International Workshop on Positron and Positronium Chemistry

J. Phys. IV France 03 (1993) C4-197-C4-200

DOI: 10.1051/jp4:1993427

Ion-exchange with Pd/Pt and Fe and their reduction to metallic state in zeolites : positron annihilation and Mössbauer studies

Zs. KAJCSOS1, K. LÁZÁR2 and G. BRAUER3

1  KFKI Research Institute for Particle and Nuclear Physics, P.O. Box 49, 1525 Budapest 114, Hungary
2  Institute of Isotopes, P.O. Box 77, 1525 Budapest, Hungary
3  Research Centre Rossendorf Inc., WIP Project, P.O. Box 510119, 01314 Dresden, Germany


Abstract
Positron annihilation and Mössbauer-effect measurements were performed on fajausite X-, Y- and ZSM-5 zeolites in as-produced and also in ion-exchanged (with Fe and Pd or Pt) and subsequently reduced states. A correlation of the positron data with the filling-up of the cages of the zeolites due to the formation of metallic particles was found. The Mössbauer results revealed that the metallic particles are bimetallic.



© EDP Sciences 1993