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类水滑石是250~450℃下用于CO_2燃烧前捕集的一类重要吸附剂。本文通过替代普通碳酸根镁铝水滑石(MG70)中的CO_3~(2-),制备了正辛酸根柱撑水滑石(LDH-8C)和硬脂酸根柱撑水滑石(LDH-8C),并通过XRD谱图表征水滑石层板间距。热重分析(TGA)实验结果表明,正辛酸根柱撑的钾修饰水滑石吸附量可达1.36 mmol/g,硬脂酸根柱撑的钾修饰水滑石吸附量可达1.93 mmol/g。但考虑到硬脂酸根离子常温下溶解度较低,制备工艺复杂等因素,正辛酸柱撑钾修饰水滑石更具应用潜力。
Hydrotalcite-like hydrotalcite is a kind of important adsorbent for CO2 capture before 250 ~ 450 ℃. In this paper, n-octanoate hydrotalcite (LDH-8C) and stearic acid pillared hydrotalcite (LDH-8C) were prepared by replacing CO_3 ~ (2-) in common MgCO3 hydrotalcite. The interlayer spacing of hydrotalcite was characterized by XRD. Thermogravimetric analysis (TGA) showed that the adsorption capacity of potassium octanoate on the octanoate column was 1.36 mmol / g, and that on the stearate column was 1.93 mmol / g. However, taking into account the low solubility of stearic acid at room temperature, the preparation process is complicated and other factors, n-octanoate P-modified hydrotalcite more potential applications.