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CoMnxOy nanosheets with molecular-scale homogeneity: an excellent catalyst for toluene combustionElectronic supplementary information (ESI) available. See DOI: 10.1039/c7cy01867c
The process driven by "redox-precipitation" reactions between Mn 7+ , Co 2+ and Mn 2+ can yield CoMn x O y nanosheet catalysts with (quasi)molecular scaled dispersed compounds which can achieve excellent catalytic activity in toluene combustion with T 50 (temperature of 50% toluene convers...
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| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | The process driven by "redox-precipitation" reactions between Mn
7+
, Co
2+
and Mn
2+
can yield CoMn
x
O
y
nanosheet catalysts with (quasi)molecular scaled dispersed compounds which can achieve excellent catalytic activity in toluene combustion with
T
50
(temperature of 50% toluene conversion) values of 172 °C and 218 °C (GHSV = 67 500 h
−1
and 540 000 h
−1
, respectively). The as-prepared CoMn
x
O
y
nanosheets demonstrated high specific surface area, and their overall morphology changed when Mn
2+
was substituted with Mn
7+
during the preparation process. The enhanced catalytic performance in toluene combustion can be ascribed to very high amounts of oxygen electrophilic species (O
−
/O
2
−
), as evidenced by XPS, H
2
-TPR and O
2
-TPD. In addition to the MnCo
2
O
4.5
phase, Co
3
O
4
formation can further improve the catalytic properties. According to TEM observations, the Co
3
O
4
species were well dispersed on MnCo
2
O
4.5
and strongly interacted with MnCo
2
O
4.5
by forming an active Co
3
O
4
-MnCo
2
O
4.5
interface. Toluene adsorption and O
2
dissociation could occur at the active interface by creating abundant oxygen vacancies, further providing adequate O
2
2−
species to take part in toluene oxidation. The influences of water vapor and other VOCs in simulated exhaust were also evaluated. The excellent performance of the catalysts in catalytic toluene combustion demonstrates that they have great potential for practical applications.
The redox-precipitation technique yields molecularly dispersed CoMn
x
O
y
nanosheets with improved physicochemical properties compared to those obtained by a conventional co-precipitation method, leading to excellent catalytic activity in toluene combustion. |
|---|---|
| ISSN: | 2044-4753 2044-4761 |
| DOI: | 10.1039/c7cy01867c |