http://www.cnr.it/ontology/cnr/individuo/prodotto/ID57375

In situ sulphated CuOx/ZrO2 and CuOx/sulphated-ZrO2 as catalysts for the reduction of NOx with NH3 in the presence of excess O2 (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

In situ sulphated CuOx/ZrO2 and CuOx/sulphated-ZrO2 as catalysts for the reduction of NOx with NH3 in the presence of excess O2 (Articolo in rivista) (literal)

Anno

2005-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.apcatb.2005.02.025 (literal)

Alternative label

Pietrogiacomi D., Magliano A., Sannino D., Campa M.C., Ciambelli P., Indovina V. (2005)
In situ sulphated CuOx/ZrO2 and CuOx/sulphated-ZrO2 as catalysts for the reduction of NOx with NH3 in the presence of excess O2
in Applied catalysis. B, Environmental (Print); Elsevier, Amsterdam (Paesi Bassi)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Pietrogiacomi D., Magliano A., Sannino D., Campa M.C., Ciambelli P., Indovina V. (literal)

Pagina inizio

83 (literal)

Pagina fine

92 (literal)

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http://www.sciencedirect.com/science/article/pii/S0926337305001232 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

60 (literal)

Rivista

Applied catalysis. B, Environmental (Rivista)

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fasc. (1-2). Elsevier. (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

10 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

1-2 (literal)

Note

ISI Web of Science (WOS) (literal)

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a) Dipartimento di Chimica, Università degli Studi di Roma \"La Sapienza\", Piazzale Aldo Moro 5, 00185 Rome, Italy b) Dipartimento di Ingegneria Chimica e Alimentare, Università di Salerno, 84084 Fisciano (Salerno), Italy. c) Sezione ''MICE'' dell'Istituto I.S.C. (CNR), c/o Dipartimento di Chimica, Universita` di Roma ''La Sapienza'', Piazzale Aldo Moro 5, 00185 Roma, Italy (literal)

Titolo

In situ sulphated CuOx/ZrO2 and CuOx/sulphated-ZrO2 as catalysts for the reduction of NOx with NH3 in the presence of excess O2 (literal)

Abstract

Sulphated catalysts containing the same amount of sulphates (2.6 SO4 nm-2) and a different amount of copper (0.3-3.9 Cu atoms nm-2), Cu/SZ, were prepared by impregnation of sulphated-ZrO2 with toluene solutions of Cu(acetylacetonate)2. Sulphated catalysts containing the same amount of copper (0.3 or 2.5 atoms nm-2) and a different amount of sulphates (up to 4.9 SO2 nm-2), Cu/ZSg, were prepared by sulphation of CuOx/ZrO2 (Cu/Z) via the gas-phase. Samples were characterised by Fourier transformed IR spectroscopy. The selective catalytic reduction of NO with NH3 in the presence of excess O2 (SCR reaction), the NH3 + O2 and the NO + O2 reactions were studied in a flow apparatus. Activity and selectivity did not depend on the sulphation method used for catalyst preparation but depended on the amount of copper and sulphate, particularly on the sulphate/copper ratio. As on Cu/Z, on Cu/SZ CuII was active for both SCR and NH3 + O2 reactions. The presence of covalent sulphates caused lower reducibility of CuII to CuI and higher Lewis acid strength of CuI in Cu/SZ than in Cu/Z. For (i) SCR, (ii) NH3 + O2 and (iii) NO + O2, Cu/ZSg were less active than the parent Cu/Z. As the sulphate content in Cu/ZSg increased, the NO yield in the NH3 + O2 reaction markedly decreased, thus accounting for the increased selectivity in the SCR reaction. In CuOx/sulphated-ZrO2 copper ions were less prone reversibly to undergo the redox process CuII/CuI. These findings provide new information on the role of copper and sulphate in determining the activity and selectivity for the SCR with NH3. (literal)

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