Rhombohedrally crystallized three-dimensionally ordered macroporous (3DOM) La0.6Sr0.4CoO3 (LSCO)-supported Co 3O4 (x wt% Co3O4/3DOM LSCO; x = 0, 2, 5, 8, and 10) were prepared using the in situ poly(methyl methacrylate)-templating strategy. Physicochemical properties of the materials were characterized by means of numerous analytical techniques, and their catalytic activities were evaluated for the combustion of toluene. It is shown that the x wt% Co3O4/3DOM LSCO samples displayed a 3DOM architecture and a high surface area of 29-32 m2/g. Among the x wt% Co3O4/3DOM LSCO samples, the 8 wt% Co3O 4/3DOM LSCO sample possessed the highest adsorbed oxygen species concentration and the best low-temperature reducibility. The 8 wt% Co 3O4/3DOM LSCO sample showed the best catalytic performance for toluene combustion (the temperatures required for toluene conversions of 10, 50, and 90% were 158, 210, and 227 C at a space velocity of 20,000 mL/(g h), respectively). The apparent activation energies (43-58 kJ/mol) of the x wt% Co3O4/3DOM LSCO (x = 0-10) samples were lower than those (59-67 kJ/mol) of the 8 wt% Co3O4/bulk LSCO and bulk LSCO samples. It is concluded that the excellent catalytic performance of 8 wt% Co3O4/3DOM LSCO was associated with its high oxygen adspecies concentration, good low-temperature reducibility, and strong interaction between Co3O4 and LSCO as well as high-quality 3DOM structure.
Scopus Subject Areas
- Process Chemistry and Technology
- Metal oxide-support interaction
- Perovskite-type oxide
- Supported CoO catalyst
- Three-dimensionally ordered macropore
- Toluene combustion