Ru/Ni/MgAl 2O 4 catalysts for steam reforming of methane

Effects of Ru content on self-activation property

Seung Chan Baek, Ki Won Jun, Yun Jo Lee, Jae Dong Kim, Dal Young Park, Kwan Young Lee

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The effects of Ru on the self-reducibility of Ru-doped Ni/MgAl 2O 4 catalysts, which do not need pre-reduction treatment with H 2, were investigated in the steam reforming of methane (SRM). The Ru-promoted Ni/MgAl 2O 4 catalysts with various amounts of Ru (0-0.5 wt%) were prepared by stepwise impregnation and co-impregnation methods using hydrotalcite-like MgAl 2O 4 support. For comparison, Ru/MgAl 2O 4 catalysts with the same amount of Ru were also prepared by the impregnation method. The catalysts were characterized by the N 2-sorption, XRD, H 2-TPR, H 2-chemisorption, and XPS methods. Ni/MgAl 2O 4 catalyst in the presence of even the trace amount of Ru (Ru content ≥0.05 wt%) showed higher conversion without pre-reduction as compared to Ru/MgAl 2O 4 catalysts in SRM under the same conditions. The self-activation of Ru-Ni/MgAl 2O 4 catalysts is mainly attributed to the spillover of hydrogen, which is produced on Ru at first and then reduces NiO species under reaction conditions. Besides, Ru doping makes the reduction of NiO easier. The stepwise impregnated Ru/Ni/MgAl 2O 4 catalyst produced superior performance as compared to co-impregnated Ru-Ni/MgAl 2O 4 catalyst for SRM.

Original languageEnglish
Pages (from-to)1225-1236
Number of pages12
JournalResearch on Chemical Intermediates
Volume38
Issue number6
DOIs
Publication statusPublished - 2012 Apr 1

Fingerprint

Steam reforming
Methane
Chemical activation
Catalysts
Impregnation
hydrotalcite
Chemisorption
Catalyst supports
Sorption
Hydrogen
X ray photoelectron spectroscopy
Doping (additives)

Keywords

  • H production
  • Ru/MgAl O4
  • Ru/Ni/MgAl O
  • Self-activation
  • Steam reforming of methane

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Ru/Ni/MgAl 2O 4 catalysts for steam reforming of methane : Effects of Ru content on self-activation property. / Baek, Seung Chan; Jun, Ki Won; Lee, Yun Jo; Kim, Jae Dong; Park, Dal Young; Lee, Kwan Young.

In: Research on Chemical Intermediates, Vol. 38, No. 6, 01.04.2012, p. 1225-1236.

Research output: Contribution to journalArticle

Baek, Seung Chan ; Jun, Ki Won ; Lee, Yun Jo ; Kim, Jae Dong ; Park, Dal Young ; Lee, Kwan Young. / Ru/Ni/MgAl 2O 4 catalysts for steam reforming of methane : Effects of Ru content on self-activation property. In: Research on Chemical Intermediates. 2012 ; Vol. 38, No. 6. pp. 1225-1236.
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AB - The effects of Ru on the self-reducibility of Ru-doped Ni/MgAl 2O 4 catalysts, which do not need pre-reduction treatment with H 2, were investigated in the steam reforming of methane (SRM). The Ru-promoted Ni/MgAl 2O 4 catalysts with various amounts of Ru (0-0.5 wt%) were prepared by stepwise impregnation and co-impregnation methods using hydrotalcite-like MgAl 2O 4 support. For comparison, Ru/MgAl 2O 4 catalysts with the same amount of Ru were also prepared by the impregnation method. The catalysts were characterized by the N 2-sorption, XRD, H 2-TPR, H 2-chemisorption, and XPS methods. Ni/MgAl 2O 4 catalyst in the presence of even the trace amount of Ru (Ru content ≥0.05 wt%) showed higher conversion without pre-reduction as compared to Ru/MgAl 2O 4 catalysts in SRM under the same conditions. The self-activation of Ru-Ni/MgAl 2O 4 catalysts is mainly attributed to the spillover of hydrogen, which is produced on Ru at first and then reduces NiO species under reaction conditions. Besides, Ru doping makes the reduction of NiO easier. The stepwise impregnated Ru/Ni/MgAl 2O 4 catalyst produced superior performance as compared to co-impregnated Ru-Ni/MgAl 2O 4 catalyst for SRM.

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