Low temperature CO oxidation over Pd catalysts supported on highly ordered mesoporous metal oxides

Mingshi Jin, Jung Nam Park, Jeong Kuk Shon, Jin Hoe Kim, Zhenghua Li, Young Kwon Park, Ji Man Kim

Research output: Contribution to journalArticlepeer-review

126 Scopus citations


Highly ordered mesoporous metal oxides (meso-MO x) such as CeO 2, Co 3O 4, Mn 2O 3, SnO 2, and TiO 2 were successfully synthesized by using nano-replication method, and Pd-loaded meso-MO x (Pd/meso-MO x) catalysts for CO oxidation were investigated. The catalysts were characterized by X-ray diffraction, N 2 adsorption-desorption, electron microscopy, CO-temperature programmed desorption (CO-TPD), and H 2-temperature programmed reduction (H 2-TPR). All of the catalysts exhibited highly ordered mesostructure and a high surface area (>100 m 2 g -1). The Pd-loading on meso-MO x supports enhanced catalytic activities compared with those of MO x supports only. Among the catalysts, Pd/meso-Co 3O 4 showed a high catalytic activity. The activities of Pd/meso-Co 3O 4 and Pd/meso-Mn 2O 3 were only slightly increased compared to the corresponding meso-MO x materials, whereas Pd/meso-CeO 2, Pd/meso-SnO 2 and Pd/meso-TiO 2 exhibited significant increases in the catalytic activities. XPS spectra showed that Pd species had strong interactions with meso-CeO 2, meso-SnO 2 and meso-TiO 2, and less interaction with meso-Co 3O 4 and meso-Mn 2O 3. These results suggest a synergistic effect between metal and the supports and the catalytic behaviours and activities are highly dependent on the nature of supports. The catalytic activities of Pd/meso-MO x can be further improved by a pre-reduction treatment. After H 2 pretreatment, all of the catalytic activities were increased. Especially, the Pd/meso-CeO 2 exhibited highest activity after the H 2 pretreatment. Because the pretreatment enhances metal-support interaction and the formation of oxygen vacancies and hydroxyl groups around Pd or the surface interaction phase, which is participated by influencing electronic state of the surface active sites.

Original languageEnglish
Pages (from-to)183-190
Number of pages8
JournalCatalysis Today
Issue number1
StatePublished - 20 May 2012


  • CO oxidation
  • Mesoporous metal oxides
  • Metal-support interaction
  • Pd


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