Controlled preparation and high catalytic performance of three-dimensionally ordered macroporous LaMnO 3 with nanovoid skeletons for the combustion of toluene

Yuxi Liu, Hongxing Dai*, Yucheng Du, Jiguang Deng, Lei Zhang, Zhenxuan Zhao, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

186 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)149-160
Number of pages12
JournalJournal of Catalysis
Volume287
DOIs
Publication statusPublished - Mar 2012

Scopus Subject Areas

  • Catalysis
  • Physical and Theoretical Chemistry

User-Defined Keywords

  • Lanthanum manganate
  • Nanovoid skeletons
  • Surfactant-assisted poly(methyl methacrylate)-templating strategy
  • Three-dimensionally ordered macroporous perovskite-type oxides
  • Toluene combustion

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