Caratterizzazione di membrane inorganiche per la separazione di idrogeno da gas di reforming

Pizzi, Diego (2008) Caratterizzazione di membrane inorganiche per la separazione di idrogeno da gas di reforming, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Ingegneria chimica dell'ambiente e della sicurezza, 20 Ciclo. DOI 10.6092/unibo/amsdottorato/904.
Documenti full-text disponibili:
Documento PDF (Italiano) - Richiede un lettore di PDF come Xpdf o Adobe Acrobat Reader
Download (3MB) | Anteprima


The work of this thesis has been focused on the characterisation of inorganic membranes for the hydrogen purification from steam reforming gas. Composite membranes based on porous inorganic supports coated with palladium silver alloys and ceramic membranes have been analysed. A brief resume of theoretical laws governing transport of gases through dense and porous inorganic membranes and an overview on different methods to prepare inorganic membranes has been also reported. A description of the experimental apparatus used for the characterisation of gas permeability properties has been reported. The device used permits to evaluate transport properties in a wide range of temperatures (till 500°C) and pressures (till 15 bar). Data obtained from experimental campaigns reveal a good agreement with Sievert law for hydrogen transport through dense palladium based membranes while different transport mechanisms, such as Knudsen diffusion and Hagen-Poiseuille flow, have been observed for porous membranes and for palladium silver alloy ones with pinholes in the metal layer. Mixtures permeation experiments reveal also concentration polarisation phenomena and hydrogen permeability reduction due to carbon monoxide adsorption on metal surface.

Tipologia del documento
Tesi di dottorato
Pizzi, Diego
Dottorato di ricerca
Settore disciplinare
Settore concorsuale
Parole chiave
idrogeno palladio membrane
Data di discussione
16 Giugno 2008

Altri metadati

Statistica sui download

Gestione del documento: Visualizza la tesi