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中文摘要：
选取天然石灰石和贝壳作为钙基材料，进行CaCO3／CaO循环煅烧／碳酸化反应，原料成本低并且资源丰富。该文在热重分析仪上对不同原料的煅烧动力学特性和CO2循环吸收特性进行研究，对循环前后产物的扫描电镜（scanning electron microscopy，SEM）形貌及其孔径分布进行分析。结果表明，随着循环次数的增加，二者活性都有所降低，通过多次循环后样品的孔径分布和扫描电镜形貌观察到，石灰石微孔减少，烧结现象严重，而贝壳分布在中孔和大孔之间，钙利用率较低，形貌未发生明显变化。由于二者组分和结构上的差异，使得天然石灰石在CO2循环吸收性能上优于贝壳，而贝壳则具有较好的循环稳定性。
英文摘要：
In the paper, natural limestone and shell were chosen as calcium-based materials for calcination/carbonation cyclic reactions due to their low cost and rich resources. The calcinations kinetic characteristics and CO/ adsorption characteristics of both materials were studied using thermo- gravimetric analysis （TGA）. Simultaneously, product was used to investigate the particle size distribution and scanning electron microscopy （SEM） of products pre and post the cycle. The results show that the adsorption activities of both materials decreases as the cycle number increases. From the particle size distribution and SEM of samples after multiple cycles, it is obtained that the number of micro-pore decreases and the sintering degree is serious for limestone, while the particle sizes of shell distributed between medium and large. Shell also had a relatively low rate of calcium utilization and its appearance hadn＇t changed significantly. For the difference in component and structure, natural limestone has a better cyclic adsorption activity than shell. However, shell exhibites the better cyclic stability.
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