English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

IR extinction coefficients as a criterion for chemical activation upon adsorption: propene interaction with cationic forms of y zeolite

MPS-Authors
/persons/resource/persons21673

Jentoft,  Friederike C.
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22071

Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Subbotina, I. R., Kazansky, V. B., Jentoft, F. C., & Schlögl, R. (2008). IR extinction coefficients as a criterion for chemical activation upon adsorption: propene interaction with cationic forms of y zeolite. Studies in Surface Science and Catalysis, 174(2), 849-852. doi:10.1016/S0167-2991(08)80021-3.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-FF20-2
Abstract
An attempt to measure integral molar extinction coefficients (IMEC) of C-H and C=C stretching bands of propene specifically adsorbed by Na+, Ca2+ and Mg2+ cations in Y zeolite was carried out via parallel IR spectroscopic and volumetric measurements. Propene was adsorbed at low pressures (< 0.5 mbar) on self-supporting wafers pressed from the zeolite powders. The IMEC of the C=C-stretching vibrations of adsorbed propene increased for these cations in the following sequence: Na < Ca < Mg. For Ca2+ and Mg2+ cations the IMEC values exceeded those for free propene. Simultaneously, the IMEC of the C-H stretching band decreased relative to that of the C=C band. These observations indicate that the C=C bond is more strongly polarized and thus more activated during interaction with bivalent than with monovalent cations. This conclusion is confirmed by oligomerization of propene on ZnY zeolite, which proceeds at room temperature. Intensities of IR bands thus provide a sensitive criterion for the activation of double bonds arising from their polarization by cations.