A highly active catalyst, Ni/Ce-ZrO2/θ-Al2O3, for on-site H2 generation by steam methane reforming: Pretreatment effect

Young Sam Oh, Hyun Seog Roh, Ki Won Jun, Young Soon Baek

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

The steam treatment effect has been investigated over the doubly impregnated catalyst, Ni/Ce-ZrO2/θ-Al2O3, in steam methane reforming (SMR). The catalyst was remarkably deactivated by steam treatment but reversibly regenerated by H2-reduction. XRD results showed that the steam treatment resulted in the formation of NiAl2O4 which is inactive for SMR but it was reversibly converted to Ni by the reduction. The reversible oxidation-reduction of Ni state was also evidenced by XPS and it was observed that the formation of NiAl2O4 is more favorable at higher temperature. It is most likely that the alumina support is only partially covered with Ce-ZrO2 and most Ni directly interacts with θ-Al2O3 which would probably make easy formation of NiAl2O4 in the presence of steam alone. The results imply that, during the start-up procedure in SMR, too high concentration of steam could deactivate seriously Al2O3 supported Ni catalysts.

Original languageEnglish
Pages (from-to)1387-1392
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume28
Issue number12
DOIs
Publication statusPublished - 2003 Dec 1

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Steam reforming
steam
pretreatment
Steam
methane
catalysts
Catalysts
Alumina
X ray photoelectron spectroscopy
aluminum oxides
oxidation
Temperature

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

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title = "A highly active catalyst, Ni/Ce-ZrO2/θ-Al2O3, for on-site H2 generation by steam methane reforming: Pretreatment effect",
abstract = "The steam treatment effect has been investigated over the doubly impregnated catalyst, Ni/Ce-ZrO2/θ-Al2O3, in steam methane reforming (SMR). The catalyst was remarkably deactivated by steam treatment but reversibly regenerated by H2-reduction. XRD results showed that the steam treatment resulted in the formation of NiAl2O4 which is inactive for SMR but it was reversibly converted to Ni by the reduction. The reversible oxidation-reduction of Ni state was also evidenced by XPS and it was observed that the formation of NiAl2O4 is more favorable at higher temperature. It is most likely that the alumina support is only partially covered with Ce-ZrO2 and most Ni directly interacts with θ-Al2O3 which would probably make easy formation of NiAl2O4 in the presence of steam alone. The results imply that, during the start-up procedure in SMR, too high concentration of steam could deactivate seriously Al2O3 supported Ni catalysts.",
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A highly active catalyst, Ni/Ce-ZrO2/θ-Al2O3, for on-site H2 generation by steam methane reforming : Pretreatment effect. / Oh, Young Sam; Roh, Hyun Seog; Jun, Ki Won; Baek, Young Soon.

In: International Journal of Hydrogen Energy, Vol. 28, No. 12, 01.12.2003, p. 1387-1392.

Research output: Contribution to journalArticle

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AU - Oh, Young Sam

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AU - Jun, Ki Won

AU - Baek, Young Soon

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AB - The steam treatment effect has been investigated over the doubly impregnated catalyst, Ni/Ce-ZrO2/θ-Al2O3, in steam methane reforming (SMR). The catalyst was remarkably deactivated by steam treatment but reversibly regenerated by H2-reduction. XRD results showed that the steam treatment resulted in the formation of NiAl2O4 which is inactive for SMR but it was reversibly converted to Ni by the reduction. The reversible oxidation-reduction of Ni state was also evidenced by XPS and it was observed that the formation of NiAl2O4 is more favorable at higher temperature. It is most likely that the alumina support is only partially covered with Ce-ZrO2 and most Ni directly interacts with θ-Al2O3 which would probably make easy formation of NiAl2O4 in the presence of steam alone. The results imply that, during the start-up procedure in SMR, too high concentration of steam could deactivate seriously Al2O3 supported Ni catalysts.

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