The weight loss obtained for these catalysts can be broadly divided into three regions: (a) weight loss up to 250 ◦C corresponds to desorption of physically adsorbed water and crystalline water; (b) weight loss in the region of 350–475 ◦C corresponds to the decomposition of Ca(OH)2; and (c) weight loss at about 480–625 ◦C was due to the decomposition of calcium salts and finally producing CaO.