Indian Institute of Technology Gandhinagar
Dalip Kumar has completed his Mtech (2015) in Chemical Engineering at the age of 25 years from Indian Institute of Technology, Gandhinagar India.
The influence of dry-coating over calcium carbonate (CaCO3) on decomposition is investigated by the help of non-isothermal study. Different percentage (%) of nano-silica (0.25%, 1% and 2%) was coated over calcium carbonate to see the effect of coating on kinetic parameters. The corresponding activation energy was calculated by model-free isoconversional technique using differential as well as integral methods. The results show that calcium carbonate with lower percentage of coating (0.25 and 1.0%) has low activation energy as compared to pure and 2% coated calcium carbonate. The results indicate that lower percentage of nano-silica acts as a heat receptor due to its higher thermal conductivity. Thus, the higher percentage of nano-silica increases the resistance to CO2 diffusion that increases the activation energy. The corresponding reaction model was predicted by Malek’s method. From this method, the experimental data was well fitted with the theoratical model proposed by Sestak Breggren (SB). The calculated parameters (m and n) in SB model and invariance of activation energy with conversion strongly signify that decomposition mechanism is single step in nature.