Characterization of BaX2/Gd2O3 (X=F, Cl, Br) catalysts for the oxidative coupling of methane

Chak Tong AU*, K. D. Chen, C. F. Ng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The reactivities of the BaX2/Gd2O3 (X=F, Cl, Br) catalysts in the oxidative coupling of methane (OCM) reaction have been investigated. It has been observed that BaF2, BaCl2, or BaBr2 can significantly improve the catalytic performance of Gd2O3. The X-ray diffraction (XRD) results indicated that ionic substitutions between the BaX2 and Gd2O3 phases occurred during the preparation of the BaX2/Gd2O3 catalysts as well as in the course of the OCM reaction. O2-TPD, O2-pulse, and Raman results showed that such ionic substitutions could lead to the increase in the amount of oxygen adsorbed on the BaX2/Gd2O3 catalysts, resulting in the promotion of catalytic performance. Based on the results of XPS and halide content analyses, we realized that the halides in the BaX2/Gd2O3 catalysts behaved rather differently in the OCM reaction. The catalytic performance of the BaX2/Gd2O3 catalysts as related to reaction time can be correlated to the behaviours of the halides in the catalysts.

Original languageEnglish
Pages (from-to)283-291
Number of pages9
JournalApplied Catalysis A: General
Volume171
Issue number2
DOIs
Publication statusPublished - 13 Jul 1998

Scopus Subject Areas

  • Catalysis
  • Process Chemistry and Technology

User-Defined Keywords

  • BaX promoter
  • Catalyst
  • GdO
  • Methane
  • Oxidative coupling

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