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Sol-gel hydrothermal synthesis of microstructured CaO-based adsorbents for CO2 capture

机译：溶胶-凝胶水热法合成用于捕获CO2的微结构CaO基吸附剂

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摘要

In this study, microstructured CaO-based adsorbents were synthesized by a sol-gel hydrothermal method using calcium nitrate tetrahydrate, citric acid and sodium hydroxide as precursors. Experiments with different NaOH concentrations (2, 6 and 10 M) were carried out to investigate the effects on the morphologies and CO2 adsorption activities of the synthesized adsorbents. X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) results showed that different NaOH concentrations resulted in different crystal phases and morphologies. A novel three-dimensional (3D) hierarchical calcite (CaCO3) hollow microspherical adsorbent composed of one-dimensional (1D) spike-shaped nanorods was obtained with 2 M NaOH. XRD analyses confirmed that the hierarchical CaCO3 hollow microspheres were characteristic of the calcite phase. The FESEM image revealed that the microspheres were composed of 1D spike-shaped nanorods with an average length of 500 nm. The cross-sectional FESEM image showed that the microspheres had hollow structures with an average inner cavity of 2 mu m and a shell thickness of approximately 0.5 mu m. The CO2 adsorption performance of the synthesized adsorbents was investigated using thermogravimetry-differential thermal analysis (TG-DTA) apparatus. The results indicated that the novel hierarchical calcite (CaCO3) hollow microspherical adsorbent composed of one-dimensional (1D) spike-shaped nanorods possessed higher carbonation conversion of 45% after 15 cycles, which was about 22% higher than that of other adsorbents synthesized with 6 and 10 M NaOH concentration and limestone. This property could be attributed to the 3D hierarchical hollow microsphere structure, 1D spike-shaped nanorod structure, trimodal pore size distribution and large BET surface area (44.85 m(2) g(-1)) of the novel adsorbent.
机译：在这项研究中，以四水硝酸钙，柠檬酸和氢氧化钠为前体，通过溶胶-凝胶水热法合成了微结构化的CaO基吸附剂。进行了不同浓度NaOH（2、6和10 M）的实验，以研究其对合成吸附剂的形态和CO2吸附活性的影响。 X射线衍射（XRD）和场发射扫描电子显微镜（FESEM）结果表明，不同的NaOH浓度导致不同的晶相和形貌。使用2 M NaOH，获得了由一维（1D）钉状纳米棒组成的新型三维（3D）分层方解石（CaCO3）中空微球吸附剂。 XRD分析证实，分层的CaCO3空心微球是方解石相的特征。 FESEM图像显示，微球由一维尖峰形纳米棒组成，平均长度为500 nm。截面FESEM图像显示，微球具有空心结构，平均内部空腔为2μm，壳厚度为约0.5μm。使用热重-差热分析（​​TG-DTA）装置研究了合成吸附剂的CO2吸附性能。结果表明，由一维（1D）穗状纳米棒组成的新型方解石（CaCO3）中空微球形吸附剂在15个循环后具有更高的碳酸化转化率，达到45％，这比用该方法合成的其他吸附剂高约22％。 6和10 M NaOH浓度和石灰石。此属性可以归因于新型吸附剂的3D分层空心微球结构，1D穗状纳米棒结构，三峰孔径分布和较大的BET表面积（44.85 m（2）g（-1））。

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