TY - JOUR
T1 - Contact dynamics for a solid-solid reaction mediated by gas-phase oxygen
T2 - Study on the soot oxidation over ceria-based catalysts
AU - Piumetti, Marco
AU - van der Linden, Bart
AU - Makkee, Michiel
AU - Miceli, Paolo
AU - Fino, Debora
AU - Russo, Nunzio
AU - Bensaid, Samir
PY - 2016/12/15
Y1 - 2016/12/15
N2 - Ceria-based catalysts with different topological and textural properties have been prepared to study the role of the soot-catalyst contact on the soot oxidation reaction. The physico-chemical features of the catalysts have been investigated by means of complementary techniques, such as powder XRD, N2 physisorption at -196 °C, optical microscopy at variable temperature, FESEM, TEM, and thermogravimetric analysis.As a whole, the best catalytic activity has been obtained with the CeO2-nanocubes (denoted to as "Ce-NC") because of their higher intrinsic reactivity. On the other hand, high-surface area materials prepared by the cerium nitrate decomposition (denoted to as "Ce-ND") or hydrothermal route (CeO2-stars, referred to as "Ce-SAS") resulted less effective toward the soot combustion, confirming the surface-sensitivity for this reaction.Moreover, it has been proven a higher dependence of the oxidation activity on the catalyst-to-soot ratio (wt./wt.) for the nanostructured catalyst (Ce-NC) exhibiting the lowest BET specific surface area (SBET = 4 m2 g-1). On the other hand, the accessible (real) surface area, at variance of the BET surface area, seems to play a relevant role for this solid-solid reaction mediated by gas-phase oxygen.
AB - Ceria-based catalysts with different topological and textural properties have been prepared to study the role of the soot-catalyst contact on the soot oxidation reaction. The physico-chemical features of the catalysts have been investigated by means of complementary techniques, such as powder XRD, N2 physisorption at -196 °C, optical microscopy at variable temperature, FESEM, TEM, and thermogravimetric analysis.As a whole, the best catalytic activity has been obtained with the CeO2-nanocubes (denoted to as "Ce-NC") because of their higher intrinsic reactivity. On the other hand, high-surface area materials prepared by the cerium nitrate decomposition (denoted to as "Ce-ND") or hydrothermal route (CeO2-stars, referred to as "Ce-SAS") resulted less effective toward the soot combustion, confirming the surface-sensitivity for this reaction.Moreover, it has been proven a higher dependence of the oxidation activity on the catalyst-to-soot ratio (wt./wt.) for the nanostructured catalyst (Ce-NC) exhibiting the lowest BET specific surface area (SBET = 4 m2 g-1). On the other hand, the accessible (real) surface area, at variance of the BET surface area, seems to play a relevant role for this solid-solid reaction mediated by gas-phase oxygen.
KW - Accessible surface area
KW - Ceria
KW - Nanocatalysts
KW - Nanostructured ceria
KW - Soot oxidation
KW - Soot-catalyst contact points
UR - http://www.scopus.com/inward/record.url?scp=84975456984&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2016.06.006
DO - 10.1016/j.apcatb.2016.06.006
M3 - Article
AN - SCOPUS:84975456984
SN - 0926-3373
VL - 199
SP - 96
EP - 107
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -