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Ammonium Nitrate Temperature‐Programmed Decomposition on Fe–Zeolite Catalysts: Effect of Deposition Method
Author(s) -
Pereira Mafalda Valdez Lancinha,
Berthout David,
Petitto Carolina,
Delahay Gérard,
Raux Stéphane,
Rousseau Séverine
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201700147
Subject(s) - catalysis , decomposition , chemistry , ammonia , inorganic chemistry , thermal decomposition , zeolite , ammonium nitrate , ammonium , nitrate , nitrogen , selective catalytic reduction , nuclear chemistry , organic chemistry
Abstract The N 2 O formation during NO x selective catalytic reduction by NH 3 is often attributed to NH 4 NO 3 intermediate decomposition. Thermal decomposition of NH 4 NO 3 has been extensively studied owing to the combination of its wide use as fertilizer and its dangerous properties. However, the decomposition of NH 4 NO 3 in the presence of a catalyst has generated less attention. The decomposition of NH 4 NO 3 may yield N x O y ‐type products such as NO, NO 2 , N 2 O, N 2 as well as HNO 3 and H 2 O. This work focuses on the emissions of N 2 O. The deposition of NH 4 NO 3 onto a Fe–zeolite catalyst was carried out by dry impregnation, by using a dilute solution of NH 4 NO 3 , and by a mechanical mixture. In the absence of catalyst, the release of N 2 O strongly depends on the conditions of the experiment (static or dynamic). The presence of a catalyst and the method of mixing ammonium nitrate into it affects its decomposition. Nitrogen formation is much more significant for the impregnated sample. For the mechanically mixed sample, the ammonium nitrate is mainly decomposed into N 2 O and NO 2 . N 2 O from ammonia oxidation was also detected in the presence of a catalyst.