Investigation of the nature of silver species on different Ag-containing NO x reduction catalysts: On the effect of the support. - Bartolomeu, Rui; Azambre, Bruno; Westermann, Alexandre; Fernandes, Auguste; Bértolo, Raquel; Hamoud, Houeida Issa; Henriques, Carlos; Da Costa, Patrick; Ribeiro, Filipa (Applied Catalysis B: Environment & Energy, 2014)