Origins of catalysis for CO oxidation on porous Ag fabricated by leaching of intermetallic compound Mg3Ag

Min Horng Liu, Satoshi Kameoka, Kazue Nishimoto, Shigenori Ueda, An Pang Tsai

Research output: Contribution to journalArticlepeer-review

Abstract

In order to investigate origins of catalysis for CO oxidation on a bulk-type Ag catalyst, porous Ag catalysts were prepared by the leaching of Mg from an intermetallic compound, Mg3Ag. Compared with a commercial Ag powder, the porous Ag catalyst exhibited significantly high catalytic activity for CO oxidation. Although the Ag powder showed low catalytic activity for CO oxidation without hysteresis, the catalytic activity of the porous Ag catalyst was significantly increased after the heating process, even though the surface area was decreased. From different structural characterizations, it was found that structural defects introduced during leaching effectively improve the catalytic activity by increasing the number of active sites. Therefore, it is concluded that the dominant factors for catalysis on porous Ag are not only the surface area of the material, but also twin boundary defects, structural strain and residual Mg species (e.g., MgOx).

Original languageEnglish
Article number117216
JournalApplied Catalysis A: General
Volume586
DOIs
Publication statusPublished - 2019 Sep 25

Keywords

  • CO oxidation
  • Leaching
  • MgOx
  • Porous Ag
  • Strain
  • Twin boundary defects

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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