SYNTHESIS AND CHARACTERISATION OF HIGHLY POROUS LITHIUM HYDROXIDE PELLETS WITH NANOADDITIVES FOR CO2 ABSORPTION
Amy Magdalene Paul*, Krishnan Unni** A.G., Sakthivel* P.
*Bharathidasan University, Trichy
** SRM University Kattankulathur
Removal of carbon dioxide from closed atmospheres is essential to maintain healthful and safe conditions for those who breathe in such atmospheres. LiOH filled canisters are used for CO2 removal inside the crew cabin of the space shuttle. LiOH is commercially available as powder. If LiOH in the powder form is used inside the canister, there is a chance of escape from the canister, and since it is corrosive, it may be inhaled by the individual causing serious health effects. Hence, LiOH pellets are being used inside the canisters for manned space missions. Since LiOH pellets are being prepared using pelletizer machine at high pressure, the pellets lacks porosity and hence less surface area. The CO2 absorption by LiOH follows the pattern of surface adsorption and chemical reaction. The porosity and surface area of pellets strongly affects the CO2 absorption capacity. Pelletization results in very low CO2 absorption capacity of the pellets. The present study involves the method of preparation of highly porous LiOH pellets for CO2 removal from the crew cabin of manned space missions. The study involves the preparation of porous LiOH pellets using different concentrations of moisture, using nano metal hydroxide Ca(OH)2, Mg(OH)2, Al(OH)2 and evaluation of the physical, mechanical & CO2 absorption capacity of porous pellets.