Improving the fluidization behavior of Ca(OH)2 adsorbent by SiO2 nanoparticles and its role on CO2 adsorption in fluidized bed

CO2 adsorption as the most important greenhouse gas and the main cause of global warming has recently become as one of the major issues in the world. In this research, modification of Ca(OH)2 sorbent by adding hydrophilic and hydrophobic silica nanoparticles to improve the CO2 adsorption process is investigated. The experiments which are carried out in a gas–solid fluidized bed show that using the vapor of methanol and and 2-propanol alcohols have the most significant effect on fluidization behavior of Ca(OH)2-hydrophilic silica adsorbent. CO2 adsorption experiments by monitoring pH of pure water shows that modification increases the adsorption period to 3 times. In addition, the adsorbent modified by hydrophilic silica in the presence of alcohol shows more CO2 adsorption in comparison with adsorbent modified by hydrophobic silica. For more investigations SEM analysis and also Richardson-Zaki equation are used.