TY - JOUR
T1 - Nanostructured MnOx catalysts in the liquid phase selective oxidation of benzyl alcohol with oxygen
T2 - Part I. Effects of Ce and Fe addition on structure and reactivity
AU - Arena, Francesco
AU - Gumina, Bianca
AU - Lombardo, Agata
AU - Espro, Claudia
AU - Patti, Antonio Frank
AU - Spadaro, Lorenzo
AU - Spiccia, Leone
PY - 2015
Y1 - 2015
N2 - The effects of Ce (Ceat/Mnat, 0-1) and Fe addition ((Ceat+Feat)/Mnat, 0.3) on the texture, structure and redox properties of MnOx systems have been investigated. Irrespective of their loading, the Ce and Fe promoters lead to nanostructured composite systems with a much larger surface area than the oxide component alone. Both Ce and Fe ions improve catalyst reducibility because of structural effects enhancing the surface availability of high oxidation number Mnn+ (n≥4) sites. At variance with the inactivity of the CeO2 and Fe2O3 promoters, the bare and promoted MnOx catalysts drive the liquid phase oxidation of benzyl alcohol with oxygen in the range of 323-353K with total aldehyde selectivity. The dependence of activity level on MnOx loading and unchanging activation energy barrier (52±5kJ/mol) substantiate the lack of electronic effects attributable to both Ce and Fe promoters. Although a marked activity loss recorded after the 1st reaction cycle, calcination at T≥473K fully restores the catalyst functionality
AB - The effects of Ce (Ceat/Mnat, 0-1) and Fe addition ((Ceat+Feat)/Mnat, 0.3) on the texture, structure and redox properties of MnOx systems have been investigated. Irrespective of their loading, the Ce and Fe promoters lead to nanostructured composite systems with a much larger surface area than the oxide component alone. Both Ce and Fe ions improve catalyst reducibility because of structural effects enhancing the surface availability of high oxidation number Mnn+ (n≥4) sites. At variance with the inactivity of the CeO2 and Fe2O3 promoters, the bare and promoted MnOx catalysts drive the liquid phase oxidation of benzyl alcohol with oxygen in the range of 323-353K with total aldehyde selectivity. The dependence of activity level on MnOx loading and unchanging activation energy barrier (52±5kJ/mol) substantiate the lack of electronic effects attributable to both Ce and Fe promoters. Although a marked activity loss recorded after the 1st reaction cycle, calcination at T≥473K fully restores the catalyst functionality
KW - MnOx catalysts
KW - Ce and Fe promoters
KW - Selective oxidation
KW - Benzyl alcohol
KW - Structural-electronic effects
UR - http://goo.gl/ywP2cB
U2 - 10.1016/j.apcatb.2014.06.054
DO - 10.1016/j.apcatb.2014.06.054
M3 - Article
SN - 0926-3373
VL - 162
SP - 260
EP - 267
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -