4th EucheMs chemistry congress

Poster Session 2
s1188
chem. Listy 106, s257–s1425 (2012)
Poster session 2 - Green Chemistry
P - 0 6 5 2
CArBon Monoxide oxidAtion over Sno2 20wt%-Ceo Mixed oxide
2
A. redey 1 , t. yuzhAKovA 1 , J. KovACS 1 , z. KovACS 1 ,
A. vASiLe 2 , C. hornoiu 2 , i. rAduLy 3 , L. rAduLy 3 ,
e. doMoKoS 1 , v. SoMoGyi 1
1 University of Pannonia, Institute of Environmental
Engineering, Veszprem, Hungary
2 Romanian Academy, Ilie Murgulescu Institute of Physical
Chemistry, Bucharest, Romania
3 Babes-Bolyai University, Faculty of Economics and Business
Managementsical Chemistry, Sfantu Gheorghe, Romania
Ceria with appropriate dopants (e.g. SnO , CuO) has been
2
widely used as catalyst for heterogeneous oxidation processes
such as CO oxidation to CO . The aim of this work was to prepare
2
the SnO -CeO catalysts in order to increase the oxygen
2 2
storage/release capacity of single oxides. Moreover it was aimed
to investigate the redox properties of the mixed oxide and its
catalytic activity with respect to their potential application for
environmental oxidation processes. The adsorption properties of
the surface layer with CO probe molecule was studied by
electrical conductivity measurements in operando condition. CO
oxidation was carried out in a mixture of CO and O (1:1) diluted
2
with helium. The experiments were carried out in the temperature
range of 25°C up to 400°C.
The obtained data showed that in the presence of oxygen the
conversion of CO to CO was 99% over tin oxide-containing
2
sample at 400 °C in comparison with pure ceria and tin dioxide
samples in which case the CO conversion was about 88 and 84 %
respectively. It is to be noted that CO is also converted even in
the absence of oxygen, however, obviously the obtained amount
of CO was smaller; (less than 40%) over SnO 20wt%-CeO ,
2 2 2
about 3% over CeO and about 4% over SnO . It indicates that
2 2
the lattice oxygen is involved in the CO conversion which was
also supported by electrical conductivity measurements.
Acknowledgments: This research was carried out in the
frame of Agreement for Scientific and Educational Cooperation
between the University of Pannonia, Veszprém, Hungary and
the “Ilie Murgulescu” Institute of Physical Chemistry, Romanian
Academy, Bucharest, Romania. This work was made under the
projects TÁMOP-4.2.1/B-09/1/KONV-2010-0003 and TÁMOP-
4.2.2/B-10/1-2010-0025. These projects are supported by the
European Union and co-financed by the European Social Fund.
Keywords: Heterogeneous catalysis; Oxidation; Redox
chemistry;
4 th EucheMs chemistry congress
P - 0 6 5 3
ProduCtion of LiGhtweiGht AGGreGAte
BASed on nAturAL PozzoLAniC And wASte
MAteriALS
o. rudiC 1 , d. zoriC 1 , J. rAnoGAJeC 1 , M. rAdeKA 1 ,
n. MiLenKoviC 1
1 University od Novi Sad Faculty of Technology, Materials
Engineering, Novi Sad, Serbia
The physical and chemical properties of the lightweight
aggregates (LWA) obtained by the thermal treatment of raw
composition based on natural pozzolanic material, waste glass,
suitable polymer and wooden dust are presented. The production
process of LWA was consisted of raw material preparation, plastic
shaping - extrusion, granulation and thermal treatment at the final
firing temperature. The final temperature (T=1020 oC) was chosen
based on the appropriate mechanical and physical properties of
the designed LWA pellets. Properties of raw natural pozzolanic
material were examined by using, DSC/TG, dilatometry, while
waste glass was characterized by chemical analysis and XRF.
The particle size distribution of the LWAs was unimodal
(d ≈ 5 mm). Textural and mechanical properties of LWA pellets
were examined by water absorption, mercury porosimetry and
compressive strength. The microstructure of LWA pellets was
characterized by SEM analysis while phase composition during
thermal treatment was studied by using high temperature XRD
analysis. Thermal conductivity of unbound, fired LWA pellets was
determined by measuring the amount of axially transferred heat
in the stationary state.
The obtained value of the LWA thermal conductivity is
suitable for the production of structural concrete blocks with
improved thermal insulating properties. Due to their high porosity
and appropriate compressive strength values, the designed LWA
could be used in the production of concrete blocks.
Keywords: Materials science; Ceramics; Electron microscopy;
X-ray diffraction; Thermal conductivty;
AUGUst 26–30, 2012, PrAGUE, cZEcH rEPUbLIc