A Comparative Mini-Review on Transition Metal Oxides Applied for the Selective Catalytic Ammonia Oxidation (NH(3)-SCO)

The selective catalytic oxidation of NH(3) (NH(3)-SCO) into N(2) and H(2)O is an efficient technology for NH(3) abatement in diesel vehicles. However, the catalysts dedicated to NH(3)-SCO are still under development. One of the groups of such catalysts constituted transition metal-based catalysts, including hydrotalcite-derived mixed metal oxides. This class of materials is characterized by tailored composition, homogenously dispersed mixed metal oxides, exhibiting high specific surface area and thermal stability. Thus, firstly, we give a short introduction to the structure and composition of hydrotalcite-like materials and their applications in NH(3)-SCO. Secondly, an overview of other transition metal-based catalysts reported in the literature is given, following a comparison of both groups. The challenges in NH(3)-SCO applications are provided, while the reaction mechanisms are discussed for particular systems.