| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 73792 | Microporous and Mesoporous Materials | 2012 | 8 Pages |
Three-dimensional (3D) mesoporous tetragonal MnO2 (MnO2-SBA16 and MnO2-KIT6) and cubic Co3O4 (Co3O4-SBA16 and Co3O4-KIT6) with high surface areas (102–184 m2/g) were, respectively prepared using the nanocasting strategy with SBA-16 and KIT-6 as templates. The KIT-6- and SBA-16-derived samples displayed 3D ordered and wormhole-like mesoporous structures, respectively. The oxygen adspecies concentration and low-temperature reducibility decreased in the orders of MnO2-KIT6 > MnO2-SBA16 > MnO2-bulk and of Co3O4-KIT6 > Co3O4-SBA16 > Co3O4-bulk, in agreement with their catalytic performance sequences. The porous MnO2 catalysts (T90% = 217–220 °C) outperformed the porous Co3O4 catalysts (T90% = 233–240 °C) for toluene oxidation, but the latter (T90% = 129–132 °C) were superior to the former (T90% = 158–178 °C) in catalytic activity for CO oxidation. It is concluded that the high surface area and oxygen adspecies concentrations, good low-temperature reducibility, and high-quality 3D ordered mesoporous architecture accounted for the excellent catalytic performance of MnO2-KIT6 and Co3O4-KIT6.
Graphical abstract3D ordered or wormhole-like mesoporous MnO2 and Co3O4 can be prepared using the KIT-6-and SBA-16-templating methods, respectively. The excellent catalytic activities of Co3O4-KIT6 for the oxidation of CO and of MnO2-KIT6 for the oxidative removal of toluene are related to the high surface area and oxygen adspecies concentrations, good low-temperature reducibility, and high-quality 3D ordered mesoporous architecture.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► 3D ordered mesoporous MnO2 and Co3O4 are prepared via the KIT-6-nanocasting route. ► Wormhole-like mesoporous MnO2 and Co3O4 are prepared by the SBA-16-templating method. ► 3D ordered or wormhole-like mesoporous MnO2 and Co3O4 possess high surface areas. ► The porous MnO2 and Co3O4 show good catalytic activity for toluene and CO oxidation. ► Surface area, Oads content, reducibility, and porosity determine catalytic activity.
