Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 50, Issue 4, Pages 227-234Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2004.01.009
Keywords
iron clay catalysts; NOx removal; Fe active species
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A study of the NO, reduction with propene in the absence/presence of oxygen over Fe-saponite clay catalysts with different iron loadings (ca. 1-28 wt.%) has been performed. The catalysts were prepared by pillaring and impregnation methods and the iron active phases were characterized by using X-ray absorption spectroscopies and electron paramagnetic resonance. The samples display significant activity in the NO, reduction in the absence of oxygen with a maximum for a Fe content close to 10 wt.%. A strong decay of catalytic activity was observed with the introduction of increasing quantities of oxygen in the feed. Iron is mostly present in all catalysts as Fe(III) with a slightly distorted local octahedral symmetry. The catalytic behavior was explained in terms of the nature and properties of the Fe existing phases. (C) 2004 Elsevier B.V. All rights reserved.
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