The cover picture illustrates how the form of the copper species deposited on the surface of MCM-41 nanospheres influences the catalytic activity of the obtained catalysts. The original SEM image of silica spheres was used as the background. In the upper left part, a drawing of the MCM-41 channels containing an organic template is presented. On the right side of the figure, an enlargement of MCM-41 channel is shown and also illustrated the procedure of template ion-exchange (TIE). Deposition of various copper phases using TIE was possible. Cu²⁺ are more active in the NO_x conversion, while CuO effectively oxidizes NH₃ - bottom of the picture. More information can be found in the Research Article by Aleksandra Jankowska, and Lucjan Chmielarz et al.