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On the selection of the best polymorph of Al 2 O 3 carriers for supported cobalt nano-spinel catalysts for N 2 O abatement: an interplay between preferable surface spreading and damaging active phase–support interaction
A series of cobalt spinel catalysts dispersed over various alumina supports (with varying alpha-, gamma-, delta- and theta-Al 2 O 3 phase contents) were prepared and thoroughly characterized (XRF, XRD, μRS, SEM/TEM/EDX/SAED, TPR) and their reactivity was evaluated in low temperature N 2 O decomposit...
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| Published in: | Catalysis science & technology 2017, Vol.7 (23), p.5723-5732 |
|---|---|
| Main Authors: | , , , , , , , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | A series of cobalt spinel catalysts dispersed over various alumina supports (with varying alpha-, gamma-, delta- and theta-Al
2
O
3
phase contents) were prepared and thoroughly characterized (XRF, XRD, μRS, SEM/TEM/EDX/SAED, TPR) and their reactivity was evaluated in low temperature N
2
O decomposition as a probe reaction. The observed significant differences in catalytic activities were discussed in terms of the support's nature, active phase dispersion, nanocrystal morphology and the alumina support–Co
3
O
4
interactions. The more reactive amorphous phase as well as the gamma-, delta- and theta-Al
2
O
3
phases gives rise to high dispersion of the spinel nanocrystals (∼10 nm) which is, however, sacrificed by the formation of mixed Co
3−x
Al
x
O
4
spinels of much less activity. It was revealed that the best support for the deN
2
O catalyst is an α-Al
2
O
3
phase of micrometric grain size and the optimal size of the Co
3
O
4
nanocrystals is in the range of 20–30 nm. This catalyst was also found to be more resistant to H
2
O, NO and O
2
contaminants in comparison to the catalysts based on γ-Al
2
O
3
. |
|---|---|
| ISSN: | 2044-4753 2044-4761 |
| DOI: | 10.1039/C7CY01575E |