Department of Chemistry
Controlled preparation and high catalytic performance of three-dimensionally ordered macroporous LaMnO3 with nanovoid skeletons for the combustion of toluene
Three-dimensionally ordered macroporous (3DOM) single-phase rhombohedral perovskite-type oxide LaMnO 3 materials with nanovoid skeletons were prepared using the poly(methyl methacrylate)-templating methods with the assistance of surfactant (poly(ethylene glycol) (PEG) or triblock copolymer (Pluronic P123)). The nature of surfactant influenced the pore structure of the LaMnO 3 sample. The use of PEG400 alone led to a 3DOM-structured LaMnO 3 without nanovoid skeletons; with the addition of PEG400 and P123, however, one could prepare LaMnO 3 samples with high-quality 3DOM structures, nanovoid skeletons, and high surface areas (37-39 m 2/g). Under the conditions of toluene concentration = 1000 ppm, toluene/O 2 molar ratio = 1:400, and space velocity = 20,000 mL/(g h), the porous LaMnO 3 samples were superior to the bulk counterpart in catalytic performance, with the nanovoid-containing 3DOM-structured LaMnO 3 catalyst performing the best (the temperatures for toluene conversions of 50% and 90% were 222-232 and 243-253 °C, respectively). The apparent activation energies (57-62 kJ/mol) over the 3DOM-structured LaMnO 3 catalysts were much lower than that (97 kJ/mol) over the bulk LaMnO 3 catalyst. We believe that the excellent performance of the 3D macroporous LaMnO 3 materials in catalyzing the combustion of toluene might be due to factors such as large surface area, high oxygen adspecies concentration, good low-temperature reducibility, and unique nanovoid-containing 3DOM structure of the materials. © 2011 Elsevier Inc. All rights reserved.
Lanthanum manganate, Nanovoid skeletons, Surfactant-assisted poly(methyl methacrylate)-templating strategy, Three-dimensionally ordered macroporous perovskite-type oxides, Toluene combustion
Source Publication Title
Journal of Catalysis
Liu, Yuxi, Hongxing Dai, Yucheng Du, Jiguang Deng, Lei Zhang, Zhenxuan Zhao, and Chak Tong Au. "Controlled preparation and high catalytic performance of three-dimensionally ordered macroporous LaMnO3 with nanovoid skeletons for the combustion of toluene." Journal of Catalysis 287 (2012): 149-160.