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Synthesis and CO_2 sorption properties of pure and modified lithium zirconate

机译：纯净和改性锆酸锂的合成及CO_2吸附性能

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Optimum conditions for synthesis of lithium zirconate by the solid state reaction were studied experimentally.The monoclinic phase lithium zirconate can be formed from a lithium carbonate,zirconia and potassium carbonate mixtures of a certain composition in the temperature range of 850-1200 degC.The equilibrium and kinetics of CO_2 sorption on pure lithium zirconate,potassium doped lithium zirconate and potassium doped lithium yttrium-zirconate were studied experimentally by TGA and modeled by gas-solid reaction equilibrium and a simple diffusion model based on the double shell CO_2 sorption mechanism.Both experimental results and thermodynamics analysis show a step function for the isotherms of CO_2 sorption on these materials.The rate of the CO_2 sorption on pure lithium zirconate is controlled by the diffusion of CO_2 in the solid lithium carbonate shell.For potassium doped lithium zirconate or lithium yttrium-zirconate the rate limiting step for CO_2 sorption is shifted to diffusion of oxygen ions in the zirconia shell.
机译：实验研究了固相反应合成锆酸锂的最佳条件。单斜晶相锆酸锂可以在850-1200℃的温度范围内由一定组成的碳酸锂，氧化锆和碳酸钾混合物形成。通过TGA实验研究了纯锆酸锂，掺杂钾的锆酸锂和掺杂钾的锆钛酸锂中的CO_2吸附动力学，并利用气固反应平衡和基于双壳CO_2吸附机理的简单扩散模型对CO_2的吸附动力学进行了建模。结果和热力学分析显示了这些材料上CO_2吸附等温线的阶跃函数。纯Zirconate上的CO_2吸附速率受CO_2在固体碳酸锂壳中的扩散控制。对于掺杂钾的Zirconate锂或Y钇-锆酸盐将CO_2吸附的限速步骤转移到扩散氧化锆壳中的n个氧离子。

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