Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: C1.00198 : ZSM-5, Y, and Mordenite Zeolites as Sensing Materials for Ethanol Vapor
Author:
The effects of the framework type, the charge balancing cation
type, and the
Si/Al ratio of ZSM-5, Y, and Mordenite zeolites on the electrical
conductivity responses towards ethanol vapor have been
investigated. All
zeolites were characterized using XRD, FT-IR, SEM, TGA, BET, and
NH$_{3}$-TPD techniques. For the effect of the framework type,
H$^{+}$Y has
a higher electrical conductivity sensitivity value than that of
H$^{+}$MOR
because of a greater pore volume and available surface area. For
the effect
of the charge balancing cation, all NH$_{4}^{+}$ZSM-5 zeolites
(Si/Al =
23, 50, 80, 280) show negative responses, whereas the H$^{+}$Y
zeolites
(Si/Al = 30, 60, 80) and the H$^{+}$MOR zeolites (Si/Al = 30,
200) show
positive responses. These differing behaviors can be traced to the
interactions between ethanol molecules and the reactive sites of the
zeolites. For the effect of Si/Al ratio, the electrical conductivity
sensitivity towards the ethanol decreases with increasing Si/Al
ratio or
decreasing Al content, and there is a lesser degree of
interaction between
ethanol molecules and the active sites of the zeolites. The
interactions
between the ethanol molecules and the zeolites were investigated
through
infrared spectroscopy.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.C1.198
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