Water-gas shift reaction over supported Pt-CeOx catalysts

Yong Tae Kim, Eun Duck Park, Hyun Chul Lee, Doohwan Lee, Kang Hee Lee

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37 Scopus citations


We conducted a comparative study for the water-gas shift (WGS) reaction over ceria-promoted Pt catalysts supported on various supports such as γ-Al2O3, SiO2, TiO2 (P-25), CeO2, SiO2-Al2O3, yttria-stabilized zirconia (YSZ) and ZrO2 in a rather severe reaction condition such as 6.7 vol.% CO, 6.7 vol.% CO2, and 33.2 vol.% H2O in H2. Among them, Pt-Ce/TiO2 showed the highest WGS activity especially at low temperatures. The effect of preparation sequences on the catalytic activity was also examined for ceria-promoted Pt supported on TiO2 and Pt-Ce/TiO2 prepared with a single-step co-impregnation method showed the highest water-gas shift activity. The CO chemisorptions, the temperature-programmed reduction (TPR), an inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and a transmission electron microscopy (TEM) with an energy dispersive X-ray spectroscopy (EDX) were conducted to characterize catalysts. The close correlation between the low-temperature water-gas shift activity and the amounts of chemisorbed CO as well as the degree of interaction between Pt and ceria has been observed. This Pt-Ce/TiO2 showed the more stable catalytic activity in the cyclic operation and the start-up/shut-down operation compared with the conventional Pt-Ce/CeO2.

Original languageEnglish
Pages (from-to)45-54
Number of pages10
JournalApplied Catalysis B: Environmental
Issue number1-2
StatePublished - 25 Jul 2009


  • Ceria
  • Fuel cell
  • Pt
  • Support
  • TiO
  • Water-gas shift


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