4th EucheMs chemistry congress

Poster Session 1
s966
chem. Listy 106, s587–s1425 (2012)
Poster session 1 - inorganic Chemistry
P - 0 2 1 0
SoLid-StAte ion exChAnGe of Cu2+ AG+ And Li+
on hy zeoLite. ion exChAnGe KinetiC Study
f. BenALiouChe 1 , y. BouCheffA 1
1 Ecole Militaire Polytechnique, UER de Chimie Appliquée,
Alger, Algeria
The areas of technological applications of ion exchange
associated to zeolite materials are progressively increasing and
have attracted ever-growing attention during the past two decades.
These include uses in catalysis, the removal of nuclear waste or
other environmental pollutants, ion chromatography and
detergency [1, 2] . Conventionally, ion exchange is commonly done
by suspending the zeolite powder in aqueous solutions of salts,
which contain the desired in-going cation. The major side effect
of this ion exchange method, compared to solid-state ion exchange
(SSIE) technique, is the hydrolysis effects that may alter the
zeolite structure and the adsorption properties [1–3] . SSIE technique
has not been as extensively studied because of the complexity of
the process. Information related to the ion exchange reaction
within zeolites and their dependence to the nature of
in-going cation is limited and associated phenomena are not well
understood. In the present study, Ag-, Cu- and Li-exchanged
zeolites are prepared by the SSIE method. Reactive mixtures of
HY zeolite and salts containing the in-going cation (AgNO , 3
CuCl or LiNO ) are reacted at high temperature in pyrex fixed
2 3
bed reactor. The ion exchange kinetic is followed using pH-metry
measurement of the acidic gas leaving the reactor (HNO or HCl)
3
and reacting with alkaline solution. On other hand, the produced
acid is estimated via thermogravimetry. Both structural and
textural investigations show good conservation of the zeolitic
structure after ionic exchange. The ion exchange kinetic study
highlights clearly the complexity of the diffusive mechanisms of
ions within the micropores of exchanged zeolites.
references:
1. H. G. Karge and E. Geidel, in: H. G. Karge and
J. Weitkamp (Eds). Molecular sieves-science and
technology, Characterization I, Springer, vol 4, 2004.
2. Yang, R. T., Adsorbents: fundamentals and applications;
Wiley-Interscience, 2003.
3. F. Benaliouche, Y. Boucheffa, F. Thibault-Starzyk,
Microporous Mesoporous Mater, 147 (2012), 10-16.
Keywords: Zeolites; Microporous materials; Ion exchange;
Solid-state reactions;
4 th EucheMs chemistry congress
P - 0 2 1 1
SyntheSiS of SinGLe SourCe PreCurSorS for
ni/zro nAnoCoMPoSiteS
2
A. dAte 1
1 Technische Universität Wien, Material Chemistry, Vienna,
Austria
Many natural materials consist of inorganic and organic
building blocks, i.e. they are inorganic-organic hybrid materials.
The concept of hybrid materials is used to study fundamental
processes of materials formation and to transfer ideas to artificial
materials. One of the greatest advantages of hybrid materials is
the possibility to create multifunctional materials.
In the work presented here, bimetallic nanocomposites are
prepared by means of inorganic-organic hybrid intermediates. To
this end, single-sourse precursors for sol-gel processing were
prepared. Organic moieties containing two functional groups are
used which
(a) connect two different metal moieties.
(b) are stable during sol-gel processing.
(c) allow some pre-orientation of the two metals.
In this presentation, a compound with both a Schiff base and
a carboxylate group was employed as bridging ligand in the
synthesis of heterobimetallic (Ni/Zr) complexes. The resulting
complex was processed by the sol-gel method, followed by
calcination to remove the organic linker. The non-hydrolytic
sol-gel method is also promising. The complex was characterised
by NMR and IR spectroscopy and the resulting mixed oxide by
SAXS measurements.
Keywords: Sol-gel processes; Zirconium; Nickel;
AUGUst 26–30, 2012, PrAGUE, cZEcH rEPUbLIc