Hydrogen production from raw bioethanol over Rh/MgAl2O4 catalyst: Impact of impurities: Heavy alcohol, aldehyde, ester, acid and amine
✍ Scribed by Anthony Le Valant; Anthony Garron; Nicolas Bion; Florence Epron; Daniel Duprez
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 283 KB
- Volume
- 138
- Category
- Article
- ISSN
- 0920-5861
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✦ Synopsis
However, the steam reforming reactions are generally preceded by a rapid transformation of ethanol into acetaldehyde (dehydrogenation, Eq. ( 4)), ethylene (dehydration, Eq. ( 5)) or methane, CO and H 2 (cracking, Eq. ( 6)).
Acetaldehyde, ethylene and methane may thus be considered as important intermediates in the formation of hydrogen from ethanol [8,9]. Once formed, methane is difficult to be reformed by steam, which penalizes the H 2 yield. The ethanol dehydration reaction occurs mainly on the acid sites of the support. The formation of ethylene involves a deactivation of the catalyst, the ethylene being a coke precursor [3], at the origin of the catalyst deactivation. The ethanol dehydrogenation yields acetaldehyde. This reaction depends not only on the basicity of the supports but also on the