High-temperature CO2 adsorption by one-step fabricated Nd-doped Li4SiO4 pellets

Abstract High-temperature CO2 capture by using Li4SiO4-based adsorbent has been considered as an efficient approach to alleviate the global warming problem. However, the relatively low conversion and lake of suitable pelletization approach still limit the applications of Li4SiO4 in practical looping system. In this work, high-performance Nd-doped Li4SiO4-based adsorbent pellets were one-step fabricated conveniently by combining the synthesis, the pelletization and the doping processes. The physico-chemical properties as well as the CO2 capture performance of doped pellets were systematically investigated. Especially, the modification effects and mechanisms of Nd-doping were also studied in depth. The results show that triple positive effects including the pore-forming, the formation of inert sintering-resistant frameworks and the occurrence of Li4SiO4 lattice defects were introduced by Nd-doping. All of above effects lead to a stable capacity of Nd-doped pellet as high as ~0.2 g/g within 20 ad-desorption cycles, which is promising for its future applications.