Abstract
The chrome-containing spinels, MgCr2O4 and CoCr2O4, were prepared via sol–gel method using glucose as a complexing agent after calcination at 1400°C and investigated as catalysts for catalytic combustion of methane. XRD indicated that single phase spinel oxides of MgCr2O4 and CoCr2O4 had formed. XPS analysis exhibited that Cr3+ was present in both catalysts, whereas a small amount of Cr6+ was only detected in MgCr2O4. The spinel MgCr2O4 proved to be very active and its catalytic activity reached T10=400°C and T90=684°C for methane combustion, which was much superior to that of CoCr2O4 (T10=480°C and T90=750°C). Larger surface area (1.1m2/g), more flexible reactive surface oxygen species, and appropriate surface and bulk structure of MgCr2O4 may contribute to its excellent catalytic activity toward methane combustion.
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