Synthesis and CO2 sorption kinetics of lithium zirconate

• Effect of calcination temperature on CO 2 sorption of Li 2 ZrO 3 was investigated. • Li 2 ZrO 3 calcined at 600 °C shows maximum CO 2 sorption. • Transition metal oxide additives are detrimental to CO 2 absorption by Li 2 ZrO 3 . • CO 2 desorption kinetics was evaluated using multiple heating rate method. Lithium zirconates are materials known for its regenerable CO 2 sorption at high temperatures. Lithium zirconate (Li 2 ZrO 3 ) was synthesized from lithium hydroxide and zirconyl nitrate using a precipitation method followed by calcination. The effect of calcination temperature on the CO 2 sorption capacity of Li 2 ZrO 3 was investigated using thermogravimetry. Lithium zirconate synthesized at 600 °C showed the highest CO 2 sorption capacity of 22.2%, which was retained even after 10 cycles. The mechanism of CO 2 sorption by Li 2 ZrO 3 is discussed in detail. The CO 2 sorption kinetics was evaluated using Avrami–Erofeev method and the desorption kinetics was studied using Kissinger method.