2. Catalyst preparation
Collected egg shells were washed thoroughly and dried at 120 °C for
1 h. It is then grinded and allowed to pass through a 0.8 mm sieve mesh.
As reported previously, CaO is formed when the egg shells are calcined
at 800 °C [14–16], we have calcined the collected waste shells for 2 h at
800 °C. It is then stored in a dessicator for further use. A series of Li
doped egg shell derived CaO catalyst in the range of 1–5% was prepared
by wet impregnation as reported by Kumar et al. [17].