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XPS Study on the Stability and Transformation of Hydrate and Carbonate Phases within MgO Systems

机译：XPS研究MgO系统中水合物和碳酸盐相的稳定性和转变

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MgO cements have great potential for carbon sequestration as they have the ability to carbonate and gain strength over time. The hydration of reactive MgO occurs at a similar rate as ordinary Portland cement (PC) and forms brucite (Mg(OH) 2 , magnesium hydroxide), which reacts with CO 2 to form a range of hydrated magnesium carbonates (HMCs). However, the formation of HMCs within the MgO–CO 2 –H 2 O system depends on many factors, such as the temperature and CO 2 concentration, among others, which play an important role in determining the rate and degree of carbonation, the type and stability of the produced HMCs and the associated strength development. It is critical to understand the stability and transformation pathway of HMCs, which are assessed here through the use of X-ray photoelectron spectroscopy (XPS). The effects of the CO 2 concentration (in air or 10% CO 2 ), exposure to high temperatures (up to 300 °C) and curing period (one or seven days) are reported. Observed changes in the binding energy (BE) indicate the formation of different components and the transformation of the hydrated carbonates from one form to another, which will influence the final performance of the carbonated blends.
机译：MgO水泥具有固碳的潜力，因为它们具有随时间推移而碳化和增加强度的能力。反应性MgO的水合速率与普通波特兰水泥（PC）相似，并形成水镁石（Mg（OH）2，氢氧化镁），其与CO 2反应形成一系列水合碳酸镁（HMCs）。但是，MgO–CO 2 –H 2 O系统中HMC的形成取决于许多因素，例如温度和CO 2浓度等，它们在确定碳酸化的速率和程度，类型方面起着重要作用。生产的HMC的稳定性，稳定性以及相关的强度发展。了解HMC的稳定性和转化途径至关重要，在此可通过使用X射线光电子能谱（XPS）对其进行评估。报告了CO 2浓度（空气中或10％CO 2中），暴露于高温（最高300°C）和固化时间（一或七天）的影响。观察到的结合能（BE）的变化表明形成了不同的组分，并且水合碳酸盐从一种形式转变为另一种形式，这将影响碳酸盐混合物的最终性能。

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