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 language | English |
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Pages (from-to) | 283-291 |
Number of pages | 9 |
Journal | Applied Catalysis A: General |
Volume | 171 |
Issue number | 2 |
DOIs | |
Publication status | Published - 13 Jul 1998 |
Scopus Subject Areas
- Catalysis
- Process Chemistry and Technology
User-Defined Keywords
- BaX promoter
- Catalyst
- GdO
- Methane
- Oxidative coupling