In Part I the chemical and microstructural nature of CuKV catalysts for diesel soot combustion was assessed. In this second communication the reaction mechanism of these catalysts is studied by testing their activity through either differential scanning calorimetry (DSC) or temperature-programmed oxidation (TPO), performed on catalyst-carbon mixtures. The following parameters were varied: the particle size of both the catalyst and the carbon powders, the catalyst-to-carbon weight ratio, the catalyst composition (besides the standard CuKV catalyst defined in Part I, binary catalysts based on a single copper or potassium vanadate + KCl were also considered). On the basis of the obtained results the presence of liquid eutectic phases (whose formation was detected via DSC runs performed in the absence of carbon) is found to be a key factor in determining the catalytic activity of all tested catalysts since it dramatically improves the catalyst-carbon contact. Once liquid phases are formed at suitable temperatures (ranging from 330 to 480°C depending on the catalyst nature), the catalytic combustion likely proceeds according to redox mechanisms.

Combustion of carbonaceous materials by Cu-K-V based catalysts. II: Reaction mechanism / Serra, V.; Saracco, Guido; Badini, CLAUDIO FRANCESCO; Specchia, Vito. - In: APPLIED CATALYSIS. B, ENVIRONMENTAL. - ISSN 0926-3373. - 11:3-4(1997), pp. 329-346. [10.1016/S0926-3373(96)00054-9]

Combustion of carbonaceous materials by Cu-K-V based catalysts. II: Reaction mechanism

SARACCO, GUIDO;BADINI, CLAUDIO FRANCESCO;SPECCHIA, Vito
1997

Abstract

In Part I the chemical and microstructural nature of CuKV catalysts for diesel soot combustion was assessed. In this second communication the reaction mechanism of these catalysts is studied by testing their activity through either differential scanning calorimetry (DSC) or temperature-programmed oxidation (TPO), performed on catalyst-carbon mixtures. The following parameters were varied: the particle size of both the catalyst and the carbon powders, the catalyst-to-carbon weight ratio, the catalyst composition (besides the standard CuKV catalyst defined in Part I, binary catalysts based on a single copper or potassium vanadate + KCl were also considered). On the basis of the obtained results the presence of liquid eutectic phases (whose formation was detected via DSC runs performed in the absence of carbon) is found to be a key factor in determining the catalytic activity of all tested catalysts since it dramatically improves the catalyst-carbon contact. Once liquid phases are formed at suitable temperatures (ranging from 330 to 480°C depending on the catalyst nature), the catalytic combustion likely proceeds according to redox mechanisms.
File in questo prodotto:
File Dimensione Formato  
1396773.pdf

non disponibili

Tipologia: 2. Post-print / Author's Accepted Manuscript
Licenza: Non Pubblico - Accesso privato/ristretto
Dimensione 1.16 MB
Formato Adobe PDF
1.16 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/1396773
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo