1 shows the SEM image of the CaO catalyst obtained
from the calcination–hydration–dehydration treatment of egg
shells (i.e.) Egg shell-CaO-900-600. It indicates a honey comb
like porous surface as observed by Hu et al. [7] for the treated
mussel shell. However in the case of the Egg shell-CaO-900,
regular micro morphology of rod like particles with size ranging
from 1.29 to 2.0 lm of width was observed