Nanooxides Derived from Hydrotalcites as Catalysts for Dry Methane Reforming Reaction - Effect of [Ni(EDTA)]<sup>2-</sup> Adsorption Time

Abstract

Mg/Al hydrotalcite-like materials containing ceria were synthesized as catalysts precursors for the reaction of dry methane reforming. The nickel species were introduced into the catalytic systems via adsorption from aqueous solution of [Ni (EDTA)]2- complexes for 4 and 24h and the effect of adsorption time on the catalytic properties of obtained materials was evaluated. The mixed nanooxides were obtained by thermal decomposition of hydrotalcite-like materials at 550°C for 4h and the catalysts were subsequently characterized by XRD, elemental analysis, H2-TPR and low temperature N2 sorption techniques. The adsorption duration of [Ni (EDTA)]2- influenced the properties of the prepared materials, such as textural properties, nickel crystallite size, and thus their catalytic activity in the reaction of dry reforming of methane. The sample which underwent adsorption for 24h turned out to be the most active in DRM reaction. However, over this catalyst RWGS reaction was well developed, which caused the excess of CO in the products of the reaction and faster deactivation of the catalyst.