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首页> 外文期刊>Journal of CO2 Utilization >Elucidating the accelerated carbonation products of calcium silicates using multi-technique approach
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Elucidating the accelerated carbonation products of calcium silicates using multi-technique approach

机译：使用多技术方法阐明钙硅胶的加速碳酸化产物

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This article features an investigation of the accelerated carbonation products of four calcium silicate phases, namely monoclinic-tricalcium silicate (3CaO center dot SiO2 or C3S), gamma-dicalcium silicate (2CaO center dot SiO2 or gamma-C2S), tricalcium disilicate (3CaO center dot 2SiO(2) or C3S2, rankinite), and monocalcium silicate (CaO center dot SiO2 or CS, wollastonite). During the carbonation reaction, the calcium silicate minerals form calcium carbonate and Ca-modified silica gel. These reaction products were examined using thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), Si-29 magic angle spining (MAS) nuclear magnetic resonance (NMR), C-13 {H-1} cross polarized (CP)/MAS NMR, and dynamic vapor sorption (DVS) techniques. Along with the crystalline forms of CaCO3 (i.e., calcite, vaterite, and aragonite), amorphous calcium carbonate (ACC) was also found to be present in the carbonated calcium silicate systems. Based on the experimental results, it is proposed that the ACC particles were stabilized by the deposition of silica layers on their surfaces. Presence of ACC also affected the pore size distribution of the matrixes, which eventually influenced the diffusion based carbonation rate of the matrixes. Moreover, the degree of carbonation of CS was found to be most effective compared to other calcium silicates in terms of the percentage of the phase reacted for the experimental conditions used in this study.
机译：本文特征调查四个硅酸钙阶段的加速碳酸化产物，即单斜硅酸钙（3CaO中心点SiO2或C3s），γ-二丙酸硅（2CaO中心点SiO2或γ-C2s），三钙（3Cao Center）点2sio（2）或C3S2，杀戮）和单钙（Cao中心点SiO2或Cs，Wollastonite）。在碳酸化反应期间，硅酸钙矿物形成碳酸钙和Ca-修饰的硅胶。使用热重分析（TGA），X射线粉末衍射（XRD），Si-29魔角灌注（MAS）核磁共振（NMR），C-13 {H-1}交叉极化（CP）检查这些反应产物。 / MAS NMR，动态蒸汽吸附（DVS）技术。除了CaCO 3（即，方解石，Vaterite和Aragonite）的结晶形式，还发现非晶碳酸钙（ACC）存在于碳酸钙硅酸钙系统中。基于实验结果，提出通过沉积二氧化硅层在其表面上稳定ACC颗粒。 ACC的存在还影响了基质的孔径分布，最终影响了基质的扩散碳化率。此外，发现Cs的碳酸化程度与其他钙硅酸钙相比，与该研究中使用的实验条件的相比百分比相比，与其他钙硅酸盐相比。

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