Elimination of gas pollutants using sno2-ceo2 catalysts
1 Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania
2 Institute of Environmental Engineering, University of Pannonia, 10 Egyetem Street, Veszpr m, 8200 Hungary
2 Institute of Environmental Engineering, University of Pannonia, 10 Egyetem Street, Veszpr m, 8200 Hungary
Abstract
The surface behavior of a series of SnO2 (5, 10 and 20 wt.%) - CeO2 catalyst samples prepared by impregnation method and also pure SnO2, CeO2, was studied based on the response of the ac electrical conductivity. The electrical measurements were carried out in operando conditions in order to obtain information about the surface interaction with reactants during CO/hydrocarbon oxidation over these catalysts. The apparent activation energies of conduction in presence of CO:O2 and C3H6:air mixtures were presented. The catalyst samples were tested in catalytic oxidation of CO and C3H6 at temperature range of room temperature up to 400 C. The catalytic activity in both oxidation reactions and selectivity towards CO2 in propylene oxidation at 400 C exhibited by the SnO2-CeO2 systems were significantly higher to those exhibited by the pure ceria catalyst.
Keywords
CO/hydrocarbon oxidation; electrical conductivity; SnO2-CeO2 catalysts