Study on Modification of NaX Zeolites: The Cobalt (II)-Exchange Kinetics and Surface Property Changes under Thermal Treatment

Figure 5

SEM images of NaX and 0.1-NaCoX thermally treated zeolites: NaX sample (a) and the samples treated at 400°C for 3 h (b), 600°C for 3 h (c), and 700°C for 3 h (d).

(a)

(b)

(c)

(d)