Abstract
Four spinel-type catalysts AB 2O 4 (CoCr 2O 4, MnCr 2O 4, MgFe 2O 4 and CoFe 2O 4) were prepared and characterized by XRD, BET, TEM and FESEM techniques. The activity of these catalysts towards the combustion of methane was evaluated in a temperature-programmed combustion (TPC) apparatus. Spinel-type-oxides containing Cr at the B site were found to provide the best results. The half-conversion temperature of methane over the CoCr 2O 4 catalyst was 376 °C with a W/ F = 0.12 g s/cm −3. On the basis of temperature-programmed oxygen desorption (TPD) analysis as well as of catalytic combustion runs, the prevalent activity of the CoCr 2O 4 catalyst could be explained by its higher capability to deliver suprafacial, weakly chemisorbed oxygen species. This catalyst, promoted by the presence of 1 wt% of palladium deposited by wet impregnation, was lined on cordierite monoliths and then tested in a lab-scale test rig. The combination of Pd and CoCr 2O 4 catalysts enables half methane conversion at 330 °C (GHSV = 10,000 h −1), a performance similar to that of conventional 4 wt% Pd-γ-Al 2O 3 catalysts but enabled with just a four-fold lower amount of noble metal.
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