http://www.cnr.it/ontology/cnr/individuo/prodotto/ID178468

The dependence of catalytic activity for N2O decomposition on the exchange extent of cobalt or copper in Na-MOR, H-MOR and Na-MFI (Articolo in rivista)

Type

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

Label

The dependence of catalytic activity for N2O decomposition on the exchange extent of cobalt or copper in Na-MOR, H-MOR and Na-MFI (Articolo in rivista) (literal)

Anno

2009-01-01T00:00:00+01:00 (literal)

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

10.1016/j.apcatb.2009.05.042 (literal)

Alternative label

Maria Cristina Campa; Valerio Indovina; Daniela Pietrogiacomi. (2009)
The dependence of catalytic activity for N2O decomposition on the exchange extent of cobalt or copper in Na-MOR, H-MOR and Na-MFI
in Applied catalysis. B, Environmental (Print); Elsevier, Amsterdam (Paesi Bassi)
(literal)

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

Maria Cristina Campa; Valerio Indovina; Daniela Pietrogiacomi. (literal)

Pagina inizio

347 (literal)

Pagina fine

354 (literal)

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

http://www.sciencedirect.com/science/article/pii/S092633730900191X (literal)

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

91 (literal)

Rivista

Applied catalysis. B, Environmental (Rivista)

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

8 (literal)

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1-2 (literal)

Note

ISI Web of Science (WOS) (literal)

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

a) Sezione ''Materiali Inorganici e Catalisi Eterogenea'' dell'Istituto ISC (CNR) c/o Dipartimento di Chimica, ''Sapienza'' Universita` di Roma, Piazzale Aldo Moro 5, 00185 Roma, Italy. b) Dipartimento di Chimica, ''Sapienza'' Universita` di Roma, Piazzale Aldo Moro 5, 00185 Roma, Italy. (literal)

Titolo

The dependence of catalytic activity for N2O decomposition on the exchange extent of cobalt or copper in Na-MOR, H-MOR and Na-MFI (literal)

Abstract

Catalytic decomposition of N2O was studied on Na-MOR, H-MOR, and Na-MFI samples exchanged to various extents with cobalt or copper. Co-MOR samples were characterized by FTIR and volumetric measurements of NO adsorption. The most abundant species on Co-MOR was Co2+(NO)2. In agreement, the volumetric data yielded NO/Co = 1.8 ± 0.2. On Co-MOR, N2O conversion progressively increased as the cobalt content increased. All samples yielded similar apparent activation energy, Ea=75 ± 5 kJ mol-1. The reaction order was 0.9 ± 0.1 for N2O, and 0.0 ± 0.1 for O2. For samples having a Co-exchange percentage up to 61%, the turnover frequency per total Co atom was independent of the cobalt content and was significantly lower for more extensively exchanged samples. On all Co-MOR samples, the turnover frequency per isolated Co atom was nearly constant, indicating isolated Co2+ as the active site. On Cu-MOR and Cu-MFI samples, N2O conversion markedly increased with the copper content. Samples having a Cu-exchange percentage up to 62% yielded higher Ea than more extensively exchanged samples (150 ± 5 kJ mol-1 vs. 100 ± 5 kJ mol-1). The reaction order was 0.5 ± 0.1 for N2O, and 0.0 ± 0.1 for O2. We conclude that in Co-MOR and Co-MFI catalysts the active site for N2O decomposition is isolated Co2+, whereas in Cu-MOR and Cu-MFI isolated Cu2+ is nearly inactive. In extensively exchanged Cu-MOR and Cu-MFI, the active site for N2O decomposition is most probably Cu1+. A similar reaction mechanism for N2O decomposition operates over Co-zeolites and extensively exchanged Cu-zeolites. (literal)

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