Isotopic studies of Sn-Cr binary oxide catalysts for methane total oxidation

Yue Xiang Zhu*, Irmina K. Murwani, Chang Jun Zhou, Erhard Kemnitz, You Chang Xie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

A series of Sn-Cr binary oxide catalysts were prepared by a co-current co-precipitation method and tested for methane total oxidation. The binary oxide catalysts have much higher surface areas and catalytic activities for methane oxidation than pure SnO2. CrOx/SnO2: with a Cr/Sn atomic ratio of 3:7 displays the highest activity. Selected samples were subjected to temperature-programmed 18O isotope-exchange measurements. Both complete and partial heteromolecular 18O isotope exchange, as well as oxygen release, was observed for all catalysts. Reaction between CH4 and 18O2 under static conditions was performed to investigate the reaction mechanism and it was found that the total oxidation of methane over Sn-Cr binary oxide catalysts occurs via a redox cycle with the chromium ion in a high oxidation state as the active center. Oxygen mobility of the catalyst plays an important role in the total oxidation of methane, but too high a mobility leads to very high oxygen release and a reduction of the surface reoxidability. This causes a decrease in the catalytic oxidation activity.

Original languageEnglish
Pages (from-to)205-211
Number of pages7
JournalCatalysis Letters
Volume85
Issue number3-4
DOIs
Publication statusPublished - Feb 2003
Externally publishedYes

Keywords

  • Methane total oxidation
  • O isotope exchange
  • Sn-Cr binary oxide

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