Molecular Sieves with Encapsulated TiO2 Clusters: Materials for the Optical Sensing of Reductive Gas Atmospheres

  1. Prof. Dr. M. Rühle2 and
  2. Prof. Dr. H. Gleiter3
  1. Michael Wark and
  2. Gerd Grubert

Published Online: 23 DEC 2005

DOI: 10.1002/352760622X.ch26

Interface Controlled Materials, Volume 9

Interface Controlled Materials, Volume 9

How to Cite

Wark, M. and Grubert, G. (2000) Molecular Sieves with Encapsulated TiO2 Clusters: Materials for the Optical Sensing of Reductive Gas Atmospheres, in Interface Controlled Materials, Volume 9 (eds M. Rühle and H. Gleiter), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/352760622X.ch26

Editor Information

  1. 2

    Max-Planck-Institut für Metallforschung, Seestraße 92, 70174 Stuttgart, Germany

  2. 3

    Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe, Germany

Author Information

  1. Institute of Applied and Physical Chemistry, University of Bremen, D-28334 Bremen, Germany

Publication History

  1. Published Online: 23 DEC 2005
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301911

Online ISBN: 9783527606221

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Keywords:

  • interface controlled materials;
  • molecular sieves with encapsulated TiO2 clusters;
  • materials for the optical sensing of reductive gas atmospheres

Summary

The reversible redox behavior of intrazeolitic titanium dioxide clusters in reducing and oxidizing atmospheres (H2, CO, O2) is studied by in-situ diffuse reflectance UV/Vis spectroscopy. Clusters of the oxides with only one or up to about ten Ti oxide units have been stabilized in the pores of molecular sieves by chemical vapor deposition (cvd) and subsequent calcination. The nuclearity of the different clusters can be deduced from the blue-shifts of absorption edges in diffuse reflectance UV/Vis spectra and from the behavior towards reduction to TiIII. The response time of hosted mononuclear TiIV Ox species for the registration of H2 is shortened by a factor of about 10 in comparison to bulk TiO2. Changes in the ratio in CO:air mixtures can be monitored with short delay.