Alcohols, especially methanol and ethanol, are feeds for hydrogen production due to their high hydrogen to carbon (H/C) atomic ratios, ease of handling, mass production, and biomass-derivability. Because of these reasons, methanol steam reforming (MSR) for hydrogen production continues to be an active area of research. On the other hand, other methods can be employed for hydrogen production from methanol, eg., decomposition, partial oxidation and autothermal reforming. A great deal of literature exists on methanol decomposition (including anaerobic oxidation) over Co or Fe oxide-based catalysts, whereas fewer papers report about Co-Fe spinels as catalysts. This paper deals with the study of methanol reaction in presence of the CoFe2O4 spinel under anaerobic conditions, which finally turns out to be a combination of (anaerobic) methanol partial oxidation and decomposition. More in detail, it has been analyzed how the main physico-chemical properties of the spinel affect its catalytic behavior and how bulk and surface features of the spinel change after methanol contact [1]. A CoFe2O4 inverse spinel calcined at two different temperatures (450°C and 750°C), in order to modulate the growth of the crystallites, has been employed in methanol anaerobic oxidation. A correlation between physico-chemical properties and catalytic performances of the material has been pursued. The study of both surface and bulk properties has been carried out by means of different experimental techniques, among which X-ray diffraction (XRD), transmission electron microscopy (TEM), and in situ FTIR spectroscopy. The FTIR study of both bulk and surface spectral features reveals that the calcination step is responsible for the different type of exposed surface sites, and as a consequence, for the different catalytic behaviour. As the use of the spinel as catalyst for methanol transformation into H2 necessarily implies a regeneration step with steam, in order to recover the oxidative capacity of the solid, both surface and bulk features of the reoxidized solids have been also studied. All results reveal that the two samples, originally morphologically quite different from one another, become very similar after just one redox cycle. Still, it has been also demonstrated that both used materials irreversibly modify their surface properties after the reduction/oxidation process.

On the role of morphology of CoFe2O4 spinel in methanol anaerobic oxidation

CROCELLA', VALENTINA;CERRATO, Giuseppina;Marziale Comito;MAGNACCA, Giuliana;MORTERRA, Claudio
2012-01-01

Abstract

Alcohols, especially methanol and ethanol, are feeds for hydrogen production due to their high hydrogen to carbon (H/C) atomic ratios, ease of handling, mass production, and biomass-derivability. Because of these reasons, methanol steam reforming (MSR) for hydrogen production continues to be an active area of research. On the other hand, other methods can be employed for hydrogen production from methanol, eg., decomposition, partial oxidation and autothermal reforming. A great deal of literature exists on methanol decomposition (including anaerobic oxidation) over Co or Fe oxide-based catalysts, whereas fewer papers report about Co-Fe spinels as catalysts. This paper deals with the study of methanol reaction in presence of the CoFe2O4 spinel under anaerobic conditions, which finally turns out to be a combination of (anaerobic) methanol partial oxidation and decomposition. More in detail, it has been analyzed how the main physico-chemical properties of the spinel affect its catalytic behavior and how bulk and surface features of the spinel change after methanol contact [1]. A CoFe2O4 inverse spinel calcined at two different temperatures (450°C and 750°C), in order to modulate the growth of the crystallites, has been employed in methanol anaerobic oxidation. A correlation between physico-chemical properties and catalytic performances of the material has been pursued. The study of both surface and bulk properties has been carried out by means of different experimental techniques, among which X-ray diffraction (XRD), transmission electron microscopy (TEM), and in situ FTIR spectroscopy. The FTIR study of both bulk and surface spectral features reveals that the calcination step is responsible for the different type of exposed surface sites, and as a consequence, for the different catalytic behaviour. As the use of the spinel as catalyst for methanol transformation into H2 necessarily implies a regeneration step with steam, in order to recover the oxidative capacity of the solid, both surface and bulk features of the reoxidized solids have been also studied. All results reveal that the two samples, originally morphologically quite different from one another, become very similar after just one redox cycle. Still, it has been also demonstrated that both used materials irreversibly modify their surface properties after the reduction/oxidation process.
2012
V Workshop on oxide bdased materials
Torino
23-27 Settembre 2012
V Workshop on oxide bdased materials - Book of abstract
Politeko Edizioni
P11MAT1
67
67
9788897862086
Valentina Crocellà; Fabrizio Cavani; Giuseppina Cerrato; Stefano Cocchi; Marziale Comito; Giuliana Magnacca; Claudio Morterra
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/118735
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