398230.fig.002a
(a)
398230.fig.002b
(b)
398230.fig.002c
(c)
398230.fig.002d
(d)
Figure 2: SEM micrographs of synthesized catalysts: (a) CaO-0.5, (b) CaO-2, (c) CaO-5, and (d) NiO-CaO (magnification: 10,000x).