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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Competition of Sulphation and Carbonation Reactions during Looping Cycles for CO2 Capture by CaO-Based Sorbents
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Competition of Sulphation and Carbonation Reactions during Looping Cycles for CO2 Capture by CaO-Based Sorbents

机译：CaO基吸附剂在循环循环中的硫酸盐化反应和碳酸化反应竞争

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Two types of sorbents are investigated here (natural limestone and highly reactive calcium aluminate pellets) to elucidate their reactivity in terms of sulphation and carbonation and determine the resulting effect on looping cycles for CO2 capture. The sorbents are tested in a thermogravimetric analyzer (TGA) apparatus using typical synthetic flue gas mixtures containing 15% CO2 and various concentrations of SO2. The sulphation and carbonation conversions were determined during sulphation/carbonation/calcination cycles. The sorbent morphology and its changes were determined by means of a scanning electron microscope (SEM). The results showed that sulphation, that is, the formation of CaSO4 at the sorbent surface, is a cumulative process with increasing numbers of reaction cycles, which hinders sorbent ability to capture CO2. In the case of high sorbent reactivity, as determined by its morphology, the unfavorable effect of sulphation is more pronounced. Unfortunately, any increase in the temperature in the carbonation stage accelerates sulphation more than carbonation as a result of higher activation energy for the sulphation reaction. The SEM analyses showed that although sulphation and carbonation occur during cycles involving calcination, an unreacted core/partially sulphated shell sorbent particle pattern is formed. The main outcomes of this research indicate that special attention should be paid to the sulphation when more reactive and more expensive, synthetic CaO-based sorbents are used for CO2 capture looping cycles. Desulphurization of flue gas before CO2 capture appears to be essential because CO2 looping cycles are so strongly affected by the presence of SO2.
机译：本文研究了两种类型的吸附剂（天然石灰石和高反应性铝酸钙颗粒），以阐明它们在硫酸盐和碳酸化方面的反应性，并确定了对循环捕集CO2的影响。吸附剂在热重分析仪（TGA）中使用典型的含有15％CO2和各种浓度SO2的合成烟气混合物进行测试。在硫酸化/碳酸化/煅烧循环中确定硫酸化和碳酸化转化率。吸附剂形态及其变化通过扫描电子显微镜（SEM）确定。结果表明，硫酸化（即在吸附剂表面形成CaSO4）是一个累积过程，其反应循环数增加，这阻碍了吸附剂捕获CO2的能力。在通过其形态确定的高吸附剂反应性的情况下，硫酸化的不利作用更加明显。不幸的是，由于用于硫酸化反应的活化能更高，因此在碳酸化阶段中温度的任何升高都比硫酸化促进了硫酸化。 SEM分析表明，尽管在涉及煅烧的循环中发生硫酸化和碳酸化，但形成了未反应的核/部分硫酸化的壳吸附剂颗粒图案。这项研究的主要结果表明，当将更具反应性和更昂贵的合成基于CaO的吸附剂用于CO2捕集循环时，应特别注意硫酸化。捕获CO2之前对烟道气进行脱硫似乎至关重要，因为SO2的存在对CO2循环循环的影响如此之大。

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