Recently, CaO nanoparticles have received considerable attentions
due to enormous development in the field of nanoscience
and nanotechnology. Some researchers showed that CaO catalyst
in nano-dimension will render amazing level of performance in
terms of product selectivity and catalytic reactivity. This includes
the transesterification reaction of triglyceride with methanol
[13,14], and reacted as chemisorbents for toxic gases, chlorinated
or phosphorus-containing compounds and pollutant in water
[15,16]. CaO is capable of providing high surface area-to volume
ratio in nano-crystalline structure, which is five times more in
the number of active sites per unit area [17], thus offering higher
basicity of catalyst which shall have positive effects on various
reactions. Interestingly, several studies have reported that the
chemical properties of Ca(OH)2 catalyst derived from CaO
possessed better and enhanced properties such as basicity and
textural properties (surface area, pore volume, pore diameter)
[18–20]. Yoosuk’s study showed that basicity of Ca(OH)2
(hydration treatment of CaO) was increased as compared to CaO
catalyst. The surface area of water treated CaO was higher
(25 m2 g1
) than CaCO3derived CaO (12.4 m2 g1
) [19].