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Ultrafast Carbon Dioxide Sorption Kinetics Using Morphology-Controllable Lithium Zirconate.

It was reported that the main obstacle of Li2ZrO3 as high-temperature CO2 adsorbents is the very slow CO2 sorption kinetics, which are ascribed to the formation of solid zirconia and carbonate layers along with unreacted lithium zirconate phase; accordingly, the Li+ and O2- have to travel long distance through the solid layers by diffusion, resulting in "sticky" ions which undergo frequent trapping and detrapping. We report here that three dimensional (3D) interconnected nanoporous Li2ZrO3 is promising for CO2 capture with ultrafast kinetics. Specifically, the nanoporous Li2ZrO3 (LZ-NP) exhibited an uptake of 27 wt % of CO2 at an ultrafast adsorption rate of 10.28 wt % min-1. Typically, LZ-NP exhibited an order of magnitude higher k1 values(kinetic parameters extracted from sorption kinetics)than those previously reported conventional Li2ZrO3 reaction system. The adsorption capacity of 25 wt % within a time scale of ~4 min are two orders magnitude faster compared to those obtained using spherical Li2ZrO3 powders and aggregates. Furthermore, nanoporous Li2ZrO3 exhibited good stability over 60 adsorption-desorption cycles, showing their suitability for practical CO2 capture applications. CO2 adsorption isotherms for Li2ZrO3 adsorbents were successfully modeled using a double-exponential equation at various CO2 partial pressures.

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