Ozone-assisted catalysis of CO: In situ Fourier transform IR evidence of the cooperative effect of a bimetallic Ag-Pd catalyst

Akihiro Tou, Hyun Ha Kim, Hisahiro Einaga, Yoshiyuki Teramoto, Atsushi Ogata

Research output: Contribution to journalArticle

Abstract

The room-temperature oxidation of CO using ozone-assisted catalysis (OAC) over monometallic or bimetallic catalysts supported on γ-Al2O3 is presented. Within the tested particle size range, ozone decomposition was insensitive to the size of the Ag particles (6.6–11.9 nm) at weight hourly space velocities of up to 360 L·g−1·h−1. Among the tested monometallic catalysts (Ag Pd, Fe, Mn, and Cu), Ag showed the highest activity for CO oxidation. Bimetallic catalysts (Ag-M or Pd-M where M = Cu, La, Ru, and Fe) were also considered by adding a second metal or perovskite oxide (LaFeO3) to Ag. A cooperative effect was observed with the bimetallic Ag-Pd catalyst for the OAC of CO oxidation at room temperature, whereas the other bimetallic catalysts showed slightly lower performance compared to the monometallic catalyst. A high ozone utilization efficiency of 0.94 was achieved with the bimetallic Ag-Pd/γ-Al2O3 catalyst. High-angle annular dark-field scanning tunneling electron microscopy (HAADF) and energy dispersive X-ray (EDX) spectroscopy measurements confirmed the proximity of the two components, which is essential for their interaction. The in situ FTIR measurements revealed that the cooperative effect in the bimetallic Ag-Pd catalyst involved modification of CO adsorption and the suppression of product accumulation. Two typical IR absorption bands of linear- (2090 cm−1) and bridge-CO (1918 cm−1) on Pd disappeared in the presence of Ag nanoparticles. Thus, the presence of Ag in contact with Pd inhibited the accumulation of carbonates, which led to enhanced catalytic performance. Adsorption site-dependent CO oxidation on Pd was also confirmed by the in situ Fourier transform IR measurement.

LanguageEnglish
Pages380-389
Number of pages10
JournalChemical Engineering Journal
Volume355
DOIs
Publication statusPublished - Jan 1 2019

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Lanthanum compounds
Iron Compounds
Copper compounds
Aluminum Oxide
Ozone
Binary alloys
Infrared imaging
Carbon Monoxide
Catalyst supports
Catalysis
Fourier transforms
Particle size
Oxidation
Scanning electron microscopy
Catalysts
Adsorption
Carbonates
Scanning tunneling microscopy
perovskite
Oxides

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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Ozone-assisted catalysis of CO : In situ Fourier transform IR evidence of the cooperative effect of a bimetallic Ag-Pd catalyst. / Tou, Akihiro; Kim, Hyun Ha; Einaga, Hisahiro; Teramoto, Yoshiyuki; Ogata, Atsushi.

In: Chemical Engineering Journal, Vol. 355, 01.01.2019, p. 380-389.

Research output: Contribution to journalArticle

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