Back to Search Start Over

Comparison study of Cu-Fe-Ti and Co-Fe-Ti oxide catalysts for selective catalytic reduction of NO with NH3 at low temperature.

Comparison study of Cu-Fe-Ti and Co-Fe-Ti oxide catalysts for selective catalytic reduction of NO with NH3 at low temperature.

Authors :
Zhu, Lin
Zhong, Zhaoping
Yang, Han
Wang, Chunhua
Source :
Journal of Colloid & Interface Science. Sep2016, Vol. 478, p11-21. 11p.
Publication Year :
2016

Abstract

In this paper, a series of Cu-Fe-Ti and Co-Fe-Ti oxide catalysts were prepared by sol gel method. Cu-Fe-Ti and Co-Fe-Ti oxide catalysts showed the moderate catalytic activity for selective catalytic reduction (SCR) of NO with NH 3 at low temperature. The catalysts with the molar ratio as 4:1:10 (M:Fe:Ti) were selected as the representatives for comparison of reaction properties and H 2 O resistance, which were denoted as Cu-Fe/TiO 2 and Co-Fe/TiO 2 respectively. The characterization results manifested Co-Fe/TiO 2 owned more adsorption capacity of the reactants and Cu-Fe/TiO 2 had better redox ability. The in situ DRIFTS experiments indicated that adsorbed NH 3 species and nitrate species both exhibited reaction activity for Co-Fe/TiO 2 , while nitric oxide was only be reduced by adsorbed NH 3 species through Eley-Rideal mechanism for Cu-Fe/TiO 2 at 150 °C. Co-Fe/TiO 2 exhibited the better resistance to H 2 O and its temperature window shifted towards the higher temperature in presence of 10 vol% H 2 O, while the SCR activity of Cu-Fe/TiO 2 was inhibited significantly in the whole temperature range investigated. The suppression of adsorption and activation for NH 3 and NO x might be the reasons for the reversible inactivation, which was confirmed by the inhibitation of catalytic activities for separation NH 3 and NO oxidation under the wet condition. We speculated that different thermal stability of adsorbed species and redox capacity of catalysts leaded to the different SCR behavior in absence and presence of H 2 O. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00219797
Volume :
478
Database :
Academic Search Index
Journal :
Journal of Colloid & Interface Science
Publication Type :
Academic Journal
Accession number :
116576079
Full Text :
https://doi.org/10.1016/j.jcis.2016.05.052