TY - JOUR
T1 - Effect of Ce and la dopants in Co 3 O 4 nanorods on the catalytic activity of CO and C 3 H 6 oxidation
AU - Li, Ping
AU - Chen, Xiaoyin
AU - Ma, Lei
AU - Bhat, Adarsh
AU - Li, Yongdan
AU - Schwank, Johannes W.
PY - 2019/3/7
Y1 - 2019/3/7
N2 -
Ce and La doped Co
3
O
4
nanorod catalysts were prepared and their catalytic activity for CO and C
3
H
6
oxidation reactions was examined. XRD, TEM, XPS, TPR, TGA and in situ DRIFTS have been used to characterize structural properties, reducibility, mobility of adsorbed oxygen and lattice oxygen, and surface intermediates for both CO and C
3
H
6
oxidation. When doping with either Ce or La, the cations occupy the Co
2+
sites in Co
3
O
4
. XPS, TPR, and TGA characterization showed that the Ce dopant decreased the ratio of surface adsorbed oxygen to lattice oxygen, and facilitated the extraction of adsorbed oxygen and lattice oxygen with hydrogen from CeO
2
-Co
3
O
4
in comparison to Co
3
O
4
, while the La dopant caused the opposite effect. The light-off performance for both CO and C
3
H
6
oxidations has been improved due to Ce doping on Co
3
O
4
, while the doping of La actually inhibited the oxidation activity of the Co
3
O
4
catalyst. Similar catalytic activity facilitation and inhibition of Ce and La dopants were also observed for the simultaneous oxidation of CO, C
3
H
6
, and NO under the conditions of simulated diesel exhaust. The results of in situ DRIFTS suggested that bidentate carbonate species could be the key intermediates of CO oxidation, which would further react with CO to form CO
2
. The results of DRIFTS showed that the mobility of lattice oxygen plays an important role in the C
3
H
6
oxidation. A mechanism was proposed where the formate and acetate species could be the reaction intermediates of C
3
H
6
oxidation, and these intermediates are more stable on La
2
O
3
-Co
3
O
4
than on Co
3
O
4
and CeO
2
-Co
3
O
4
catalysts.
AB -
Ce and La doped Co
3
O
4
nanorod catalysts were prepared and their catalytic activity for CO and C
3
H
6
oxidation reactions was examined. XRD, TEM, XPS, TPR, TGA and in situ DRIFTS have been used to characterize structural properties, reducibility, mobility of adsorbed oxygen and lattice oxygen, and surface intermediates for both CO and C
3
H
6
oxidation. When doping with either Ce or La, the cations occupy the Co
2+
sites in Co
3
O
4
. XPS, TPR, and TGA characterization showed that the Ce dopant decreased the ratio of surface adsorbed oxygen to lattice oxygen, and facilitated the extraction of adsorbed oxygen and lattice oxygen with hydrogen from CeO
2
-Co
3
O
4
in comparison to Co
3
O
4
, while the La dopant caused the opposite effect. The light-off performance for both CO and C
3
H
6
oxidations has been improved due to Ce doping on Co
3
O
4
, while the doping of La actually inhibited the oxidation activity of the Co
3
O
4
catalyst. Similar catalytic activity facilitation and inhibition of Ce and La dopants were also observed for the simultaneous oxidation of CO, C
3
H
6
, and NO under the conditions of simulated diesel exhaust. The results of in situ DRIFTS suggested that bidentate carbonate species could be the key intermediates of CO oxidation, which would further react with CO to form CO
2
. The results of DRIFTS showed that the mobility of lattice oxygen plays an important role in the C
3
H
6
oxidation. A mechanism was proposed where the formate and acetate species could be the reaction intermediates of C
3
H
6
oxidation, and these intermediates are more stable on La
2
O
3
-Co
3
O
4
than on Co
3
O
4
and CeO
2
-Co
3
O
4
catalysts.
KW - LOW-TEMPERATURE OXIDATION
KW - PROPANE OXIDATION
KW - COBALT OXIDE
KW - PROPENE OXIDATION
KW - SURFACE
KW - PERFORMANCE
KW - DIESEL
KW - EMISSIONS
KW - EFFICIENT
KW - TOLUENE
UR - http://www.scopus.com/inward/record.url?scp=85062563787&partnerID=8YFLogxK
U2 - 10.1039/c8cy02460j
DO - 10.1039/c8cy02460j
M3 - Article
AN - SCOPUS:85062563787
SN - 2044-4753
VL - 9
SP - 1165
EP - 1177
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 5
ER -