Fig. 3: TEM images and UV − Vis spectra of prepared samples.

TEM images of the calcined NiO_x/ITQ-2 (a) and NiO_x/ITQ-2-co (b); UV − Vis spectra of the uncalcined Ni/ITQ-2 and Ni/ITQ-2-co showed with solid lines (c) and the calcined Ni/ITQ-2 and Ni/ITQ-2-co showed with dotted lines (d).