Journal
JOURNAL OF CATALYSIS
Volume 202, Issue 1, Pages 156-162Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/jcat.2001.3279
Keywords
nitrous oxide; ammonia; iron; zeolite; selective reduction; temperature programmed desorption
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A series of iron-exchanged zeolite beta (BEA) has been characterized by temperature programmed desorption (TPD) of oxygen and tested in the catalytic reduction of N2O by NH3. TPD of O-2 has clearly shown that iron-oxo species formed upon reoxidation by nitrous oxide of Fe2+-BEA are more labile than those generated by calcination in ain In the selective catalytic reduction of N2O by NH3 the conversion of N2O increases until a degree of iron exchange level of 100% and then decreases. In contrast, the intrinsic activity per mole of iron decreases drastically with the increase of iron content. Mononuclear iron-oxo species have been proposed as the most active sites for the reduction of N2O by NH3; binuclear iron-oxo species and iron oxides aggregates are less active. (C) 2001 Academic Press.
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