Pd/K/Co-oxide catalyst for water gas shift

Eugene Kono, Sakurako Tamura, Keisuke Yamamuro, Shuhei Ogo, Yasushi Sekine

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Various Co3O4 catalysts were investigated for the water gas shift (WGS) reaction for hydrogen production. Although the catalyst supporting only palladium (Pd/Co3O4) showed low catalytic activity and higher selectivity to methanation, Pd/K/Co3O4 catalyst, with loading of potassium exceeding 0.78 wt%, showed high catalytic activity for the WGS reaction. Catalysts on which Pd and K exist closely showed high activity, as confirmed using various preparation methods. Results of XPS measurements for Pd/K/Co3O4 revealed that supported potassium donated electrons to Pd and Co. The state of CO adsorption species was affected by the potassium loading, resulting in high catalytic activity for the Pd/K/Co3O4 catalyst. These effects gave the Pd/K/Co3O4 catalyst high catalytic activity for the WGS reaction. That reaction over Pd/K/Co3O4 proceeds via surface cobalt carbonyl and then formate intermediates, as revealed by the TG and isotope exchange measurements using H2 18O and DRIFT.

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalApplied Catalysis A: General
Volume489
DOIs
Publication statusPublished - 2014

Fingerprint

Water gas shift
Oxides
Catalysts
Catalyst activity
Potassium
formic acid
Methanation
Catalyst selectivity
Palladium
Carbon Monoxide
Hydrogen production
Cobalt
Isotopes
X ray photoelectron spectroscopy
Adsorption
Electrons

Keywords

  • Cobalt catalyst
  • In situ IR
  • Potassium addition
  • Water gas shift

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Pd/K/Co-oxide catalyst for water gas shift. / Kono, Eugene; Tamura, Sakurako; Yamamuro, Keisuke; Ogo, Shuhei; Sekine, Yasushi.

In: Applied Catalysis A: General, Vol. 489, 2014, p. 247-254.

Research output: Contribution to journalArticle

Kono, Eugene ; Tamura, Sakurako ; Yamamuro, Keisuke ; Ogo, Shuhei ; Sekine, Yasushi. / Pd/K/Co-oxide catalyst for water gas shift. In: Applied Catalysis A: General. 2014 ; Vol. 489. pp. 247-254.
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AU - Sekine, Yasushi

PY - 2014

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N2 - Various Co3O4 catalysts were investigated for the water gas shift (WGS) reaction for hydrogen production. Although the catalyst supporting only palladium (Pd/Co3O4) showed low catalytic activity and higher selectivity to methanation, Pd/K/Co3O4 catalyst, with loading of potassium exceeding 0.78 wt%, showed high catalytic activity for the WGS reaction. Catalysts on which Pd and K exist closely showed high activity, as confirmed using various preparation methods. Results of XPS measurements for Pd/K/Co3O4 revealed that supported potassium donated electrons to Pd and Co. The state of CO adsorption species was affected by the potassium loading, resulting in high catalytic activity for the Pd/K/Co3O4 catalyst. These effects gave the Pd/K/Co3O4 catalyst high catalytic activity for the WGS reaction. That reaction over Pd/K/Co3O4 proceeds via surface cobalt carbonyl and then formate intermediates, as revealed by the TG and isotope exchange measurements using H2 18O and DRIFT.

AB - Various Co3O4 catalysts were investigated for the water gas shift (WGS) reaction for hydrogen production. Although the catalyst supporting only palladium (Pd/Co3O4) showed low catalytic activity and higher selectivity to methanation, Pd/K/Co3O4 catalyst, with loading of potassium exceeding 0.78 wt%, showed high catalytic activity for the WGS reaction. Catalysts on which Pd and K exist closely showed high activity, as confirmed using various preparation methods. Results of XPS measurements for Pd/K/Co3O4 revealed that supported potassium donated electrons to Pd and Co. The state of CO adsorption species was affected by the potassium loading, resulting in high catalytic activity for the Pd/K/Co3O4 catalyst. These effects gave the Pd/K/Co3O4 catalyst high catalytic activity for the WGS reaction. That reaction over Pd/K/Co3O4 proceeds via surface cobalt carbonyl and then formate intermediates, as revealed by the TG and isotope exchange measurements using H2 18O and DRIFT.

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