The reversibility of the reaction CaCO3 ⇄ CaO+CO2
The reversibility of the reaction CaCO3 ⇄ CaO+CO2
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DOI：
10.1002/jctb.5020231005
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发表时间：
2007-04
期刊：
影响因子：
--
通讯作者：
R. Barker
中科院分区：
文献类型：
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作者：
R. Barker
反应CaCO3 → CaO+CO2的可逆性已经通过大量的循环（最多40次）进行了研究，主要是在866 °C下。氧化物的分解率总是100%，但如此形成的氧化物对二氧化碳的反应性在快速的初始反应后明显下降福尔斯。从无孔碳酸钙到氧化物，表面积有很大的增加，这是由于形成了孔，大多数非常小（< 4 nm）。逆反应的快速组分是表面反应，随后的缓慢反应由二氧化碳通过新形成的碳酸盐层的缓慢扩散控制。反应的可逆性随着循环次数的增加而降低，首先迅速，然后更缓慢：第一种效果可能是由于氧化物中孔体积的损失，第二种是由于碳酸盐的烧结。
The reversibility of the reaction CaCO3 ⇌ CaO+CO2 has been examined through a large number of cycles (up to 40), mainly at 866 °C. The decomposition to the oxide is always 100% but the reactivity of the oxide so formed to carbon dioxide falls off markedly after a rapid initial reaction. There is a large increase in surface area on going from the non-porous calcium carbonate to the oxide and this is due to the formation of pores, mostly very small (< 4 nm). The fast component of the back reaction is a surface reaction and the subsequent slow reaction is controlled by the slow diffusion of carbon dioxide through the newly formed carbonate layer. The reversibility of the reaction decreases with the number of cycles, rapidly at first and then more slowly: the first effect is probably due to loss of pore volume in the oxide and the second to sintering of the carbonate.