Abstract
| Lingua originale | English |
|---|---|
| pagine (da-a) | 182-188 |
| Numero di pagine | 7 |
| Rivista | Applied Catalysis A: General |
| Volume | 349 |
| Stato di pubblicazione | Published - 2008 |
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All Science Journal Classification (ASJC) codes
- Catalysis
- Process Chemistry and Technology
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Photocatalytic oxidation of aromatic alcohols to aldehydes in aqueous suspension of home prepared titanium dioxide. 1: Selectivity enhancement by aliphatic alcohols. / Augugliaro, Vincenzo; Palmisano, Leonardo; Loddo, Vittorio; Palmisano, Giovanni; Parrino, Francesco; López-Muñoz, María José; Kisch, Horst; Yurdakal, Sedat; Parrino, Francesco; Márquez-Álvarez, Carlos.
In: Applied Catalysis A: General, Vol. 349, 2008, pag. 182-188.Risultato della ricerca: Article
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TY - JOUR
T1 - Photocatalytic oxidation of aromatic alcohols to aldehydes in aqueous suspension of home prepared titanium dioxide. 1: Selectivity enhancement by aliphatic alcohols
AU - Augugliaro, Vincenzo
AU - Palmisano, Leonardo
AU - Loddo, Vittorio
AU - Palmisano, Giovanni
AU - Parrino, Francesco
AU - López-Muñoz, María José
AU - Kisch, Horst
AU - Yurdakal, Sedat
AU - Parrino, Francesco
AU - Márquez-Álvarez, Carlos
PY - 2008
Y1 - 2008
N2 - Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl alcohol (BA) and 4-methoxybenzyl alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterisation of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both alcohols the main oxidation products were the corresponding aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of aromatic alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the aromatic alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); and (ii) the aliphatic alcohols preferentially compete with aromatic alcohols for the mineralizing pathway.
AB - Oxygenated aqueous suspensions of home-prepared (HP) and commercial TiO2 catalysts were used in a batch photoreactor for carrying out the oxidation of benzyl alcohol (BA) and 4-methoxybenzyl alcohol (MBA) under different operative conditions. HP catalysts were synthesized from TiCl4 and underwent a hydrolysis treatment of different times under mild conditions. The textural characterisation of catalysts was carried out with XRD, SEM observations, BET surface area and porosity measurements. For both alcohols the main oxidation products were the corresponding aromatic aldehydes and CO2. The HP catalysts exhibited selectivity values towards the aldehyde production up to 28% (BA conversion: 50%) and 41% (MBA conversion: 65%), about four times higher than those of commercial TiO2. The addition of an aliphatic alcohol (methanol, ethanol, 2-propanol or tert-butanol) in small amounts with respect to water decreased the overall oxidation rate of aromatic alcohols but enhanced the selectivity for aldehyde formation up to 1.5 times. The reactivity results suggest that: (i) the aromatic alcohol molecules interact with the TiO2 surface in different ways that eventually determine two parallel reaction pathways (partial oxidation or mineralization); and (ii) the aliphatic alcohols preferentially compete with aromatic alcohols for the mineralizing pathway.
KW - Photocatalysis, TiO2, Aromatic alcohols, Aliphatic alcohol, Selective oxidation
UR - http://hdl.handle.net/10447/47984
M3 - Article
VL - 349
SP - 182
EP - 188
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
ER -