Partial oxidation of methane over Ni/Ce-ZrO2/θ-Al 2O3

Zhong Wen Liu, Hyun Seog Roh, Ki Won Jun, Sang Eon Park, Taek Yong Song

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15 Citations (Scopus)

Abstract

The catalytic behavior of Ni/Ce-ZrO2/θ-Al 2O3 has been investigated in the partial oxidation of methane (POM) toward synthesis gas. The catalyst showed high activity and selectivity due to the heat treatment of the support and the promotional effect of Ce-ZrO2. It is suggested that the support was stabilized through the heat treatment of γ- A12O3 and the precoating of Ce-ZrO2, on which a protective layer was formed. Moreover, sintering of the catalyst was greatly suppressed for 24 h test. Pulse experiments of CH4, O2 and/or CH4/O2 with a molar ratio of 2 were systematically performed over fresh, partially reduced and well reduced catalyst Results indicate that CH4 can be partially oxidized to CO and H2 by the reactive oxygen in complex NiOx species existing over the fresh catalyst. It is demonstrated that POM over Ni/Ce-ZrO2/θ-Al2O3 follows the pyrolysis mechanism, and both the carbonaceous materials from CH4 decomposition over metallic nickel and the reactive oxygen species present on NiOx and Ce-ZrO2 are intermediates for POM.

Original languageEnglish
Pages (from-to)742-748
Number of pages7
JournalKorean Journal of Chemical Engineering
Volume19
Issue number5
DOIs
Publication statusPublished - 2002 Sep

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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