The Role of Fe in Ni-Fe/TiO 2 Catalysts for the Dry Reforming of Methane.

A series of nickel- and iron-modified titanium dioxide (Ni-Fe/TiO 2 ) are studied for the dry reforming of methane (DRM) at 550 °C. Temperature-programmed surface reactions using CH 4 and CO 2 as probe molecules, as well as activity results, confirmed that both CO 2 and CH 4 conversion decreased with the addition of Fe. The XPS results obtained from reduced and used catalysts suggested changes in the surface nickel and iron species. Characterizations, particularly thermogravimetric analysis (TGA) and Raman spectroscopy over used catalysts, revealed that the addition of Fe can greatly inhibit the coke formation. In situ DRIFTS further identified that the addition of Fe favored the formation of carbonate species, which can facilitate the removal of coke deposited on the surface. [ABSTRACT FROM AUTHOR]

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