In this study, nanocomposites of Calcium hydroxide (Ca(OH)2) and Silica (SiO2) were developed using tetraethylorthosilicate precursor, and the impact of ammonia concentration on the reaction kinetics of Ca(OH)2 to CaO conversion were studied. The Ca(OH)2 nanoparticles were synthesized by the sol-gel method. The formation of Ca(OH)2 particles was confirmed through X-ray diffraction. Transmission electron microscopy (TEM) and Scanning electron microscopy (SEM) provided evidence for the presence of a SiO2 layer on Ca(OH)2. Thermogravimetric analyses were carried out under N2 atmosphere to study the dehydration efficiency of the Ca(OH)2 system in the presence of SiO2. The results were found to be consistent with the findings from XRD and Raman analysis. Differential Scanning Calorimetry (DSC) was done to determine the impact of ammonia and silica on the endothermic peak of Ca(OH)2 and CaCO3. TG results were used to determine the weight loss, activation energy (Ea), entropy (ΔS), enthalpy (ΔH), and Gibbs free energy (ΔG).