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Currently, there is a lack of detailed knowledge about methane (CH 4 ) reactions on metal oxide surfaces. This reaction involves in different processes such as chemical looping combustion and catalytic carbon dioxide (CO 2 ) reforming of CH 4 . In this study,  in situ  diffuse reflectance infrared Fourier transform spectroscopy was used to investigate CH 4  reaction on three transition metal oxides (CoO, CuO, and α-Fe 2 O 3 ) which are commonly used in these processes at temperatures ranging from 100 °C to 700 °C. The results show that CH 4  is adsorbed on the metal oxide surfaces as methoxy and formate, and then the methoxy group reacts with the metal oxide lattice oxygen forming bicarbonate. Under the effect of the used reaction temperature, the bicarbonate decomposes to CO 2  and water vapor.

Methane activation on metal oxide nanoparticles: spectroscopic identification of reaction mechanism