CuO NANOPARTICLES ENTRAPPED IN MFI FRAMEWORK: INVESTIGATION OF TEXTURAL, MAGNETIC AND CATALYTIC PROPERTIES OF Cu-ZSM-5 AND Cu-S-1 CATALYSTS (Articolo in rivista)

Type

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

Label

• CuO NANOPARTICLES ENTRAPPED IN MFI FRAMEWORK: INVESTIGATION OF TEXTURAL, MAGNETIC AND CATALYTIC PROPERTIES OF Cu-ZSM-5 AND Cu-S-1 CATALYSTS (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.2009.06.020 (literal)

Alternative label

• FIERRO G. ; FERRARIS G. ; MORETTI G. (2009)
  CuO NANOPARTICLES ENTRAPPED IN MFI FRAMEWORK: INVESTIGATION OF TEXTURAL, MAGNETIC AND CATALYTIC PROPERTIES OF Cu-ZSM-5 AND Cu-S-1 CATALYSTS
  in Applied catalysis. B, Environmental (Print); ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
  (literal)

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

• FIERRO G. ; FERRARIS G. ; MORETTI G. (literal)

Pagina inizio

• 499 (literal)

Pagina fine

• 506 (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#note

• fasc. (1-2). Elsevier. (literal)

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

• 8 (literal)

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

• 1-2 (literal)

Note

• ISI Web of Science (WOS) (literal)

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

• FIERRO G. [1]; FERRARIS G. [1]; MORETTI G. [2]; [1] Consiglio Nazionale delle Ricerche - Istituto dei Sistemi Complessi (ISC), Sezione di Roma '‘Materiali Inorganici e Catalisi Eterogenea’' (MICE, ex Centro di Studio CNR ‘'SACSO'’), c/o Dipartimento di Chimica, Università di Roma 'SAPIENZA'; [2] Dipartimento di Chimica - Università di Roma 'SAPIENZA' (literal)

Titolo

• CuO NANOPARTICLES ENTRAPPED IN MFI FRAMEWORK: INVESTIGATION OF TEXTURAL, MAGNETIC AND CATALYTIC PROPERTIES OF Cu-ZSM-5 AND Cu-S-1 CATALYSTS (literal)

Abstract

• Cu-ZSM-5 zeolites are active catalysts for both NO decomposition and selective catalytic reduction (SCR) of NO by hydrocarbons in the presence of oxygen. Unfortunately they suffer of deactivation in the presence of water vapour in the feed that is mainly due to either the segregation of the initial extra-framework copper ions, or the sintering of the entrapped CuO-like species, to form large CuO aggregates on the external surface of the zeolite crystallites. In order to acquire more information about the nature of the CuO-like species which are formed upon dehydration of these materials at high temperature and the changes occurring to these species after catalysis, we investigated some Cu-ZSM-5 and Cu-S-1 catalysts by porosimetry and magnetic susceptibility measurements. Texture analysis revealed that, with respect to the H-ZSM-5 and S-1 parent materials, in the Cu-ZSM-5 and Cu-S-1 dehydrated samples a decrease of the surface area and micropore volume occurred, suggesting that most of the CuO-like species are entrapped into the zeolites channels. Consequently, their size has to fit the channel diameter (ca. 5.5 Å). This is confirmed by the magnetic results. Indeed, differently from bulk CuO, characterized by an antiferromagnetic behaviour, the magnetic susceptibility measurements of all the Cu-ZSM-5 samples followed the Curie–Weiss law typical of paramagnetic species. The lost of the antiferromagnetic behaviour supports the idea that the CuO-like particles are entrapped in the Cu-ZSM-5 channels as nanoclusters. On the other hand, the Cu-S-1 catalyst shows a complexmagnetic behaviour, and peculiar textural modifications with respect to the S-1 parent material, suggesting that, with respect to those formed in Cu-ZSM-5, the CuO nanoclusters in this case are of a higher nuclearity and in a different location in the MFI structure. Under real catalytic conditions, i.e. in the presence of ca. 12% of water vapour in the feed, some changes occur to the CuO nanoparticles. In particular their structure seems to be affected. An increase in nuclearity is suggested that should lead to a decrease of the catalytic activity, as observed in the Cu-S-1 catalyst. (literal)

Editore

• ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS (Editore)

Prodotto di

• Materiali inorganici complessi per catalisi eterogenea. (Bio)sensori. (MD.P02.005.002) (Modulo)

Autore CNR

• GIUSEPPE FIERRO (Unità di personale interno)
• GIOVANNI FERRARIS (Unità di personale interno)

Insieme di parole chiave

• Keywords of "CuO NANOPARTICLES ENTRAPPED IN MFI FRAMEWORK: INVESTIGATION OF TEXTURAL, MAGNETIC AND CATALYTIC PROPERTIES OF Cu-ZSM-5 AND Cu-S-1 CATALYSTS" (Insieme di parole chiave)

Incoming links:

Autore CNR di

• GIUSEPPE FIERRO (Unità di personale interno)
• GIOVANNI FERRARIS (Unità di personale interno)

Prodotto

• Materiali inorganici complessi per catalisi eterogenea. (Bio)sensori. (MD.P02.005.002) (Modulo)

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

• Applied catalysis. B, Environmental (Rivista)

Editore di

• ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS (Editore)

Insieme di parole chiave di

• Keywords of "CuO NANOPARTICLES ENTRAPPED IN MFI FRAMEWORK: INVESTIGATION OF TEXTURAL, MAGNETIC AND CATALYTIC PROPERTIES OF Cu-ZSM-5 AND Cu-S-1 CATALYSTS" (Insieme di parole chiave)