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

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

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Various Co3 O4 catalysts were investigated for the water gas shift (WGS) reaction for hydrogen production. Although the catalyst supporting only palladium (Pd/Co3 O4) showed low catalytic activity and higher selectivity to methanation, Pd/K/Co3 O4catalyst, 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/Co3 O4 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/Co3 O4 catalyst. These effects gave the Pd/K/Co3 O4 catalyst high catalytic activity for the WGS reaction. That reaction over Pd/K/Co3 O4 proceeds via surface cobalt carbonyl and then formate intermediates, as revealed by the TG and isotope exchange measurements using H218O and DRIFT.

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalApplied Catalysis A: General
Volume489
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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