Study of the catalytic performance, surface properties and active oxygen species of the fluoride-containing rare earth alkaline earth oxide based catalysts for the oxidative coupling of methane
- 化学化工－已发表论文 
Addition of SrF2 and BaF2 to Ln(2)O(3) and LaOF improved their catalytic performances for the OCM reaction. The promotion effect of the fluorides in the catalysts may be principally related to the extent of phase-phase interaction between fluoride and oxide. Comparing with the corresponding alkaline earth oxide promoted Ln(2)O(3) catalyst system, an alkaline earth fluoride promoted Ln(2)O(3) catalyst system is less basic and will therefore be favorable to prevent the CO2 inhibition. However, there is no simple correlation between the acidity/basicity of an OCM catalyst and its catalytic performance. The results of in situ FTIR characterization show that O-2(-) is the active oxygen species or one of the active species for OCM reaction over LaOF and BaF2/LaOF catalysts.