Steam reforming of ethanol over K promoted Co catalyst

Shuhei Ogo, Takuya Shimizu, Yusaku Nakazawa, Kei Mukawa, Daiki Mukai, Yasushi Sekine

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22 Citations (Scopus)

Abstract

We investigated the catalytic activity of Co/K/α-Al2O3 with various potassium (K) loadings for ethanol steam reforming. The promotion effect of K loading and the role of K in Co/K/α-Al2O3 were investigated using TEM-EDX, H2-TPR, XAFS, XPS, and IR measurements. Results show that loading of 1-2 wt% K on Co/α-Al2O3 was effective for improving catalytic activity, selectivity to hydrogen and suppressing by-product (CH4, C2H4, and coke) formations. Measurements by H2-TPR and XAFS showed that the reducibility of the supported Co species decreased by K loading. TEM measurements revealed that the Co0-CoO core-shell structure was formed over Co/K/α-Al2O3 during ethanol steam reforming at 823 K, suggesting that the oxidized Co species (CoO) is a highly active species in ethanol steam reforming. In situ IR measurements revealed that the adsorbed ethanol forms stable acetate species by K loading, which improves hydrogen selectivity.

Original languageEnglish
Pages (from-to)30-38
Number of pages9
JournalApplied Catalysis A: General
Volume495
Publication statusPublished - 2015

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Keywords

  • Core-shell structure
  • Ethanol steam reforming
  • Hydrogen production
  • In situ IR
  • K loading

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Ogo, S., Shimizu, T., Nakazawa, Y., Mukawa, K., Mukai, D., & Sekine, Y. (2015). Steam reforming of ethanol over K promoted Co catalyst. Applied Catalysis A: General, 495, 30-38.