水热法制备条件对层状钙镁铝氧化物二氧化碳吸附性能的影响

Effect of hydrothermal preparation conditions on carbon dioxide adsorption properties of layered Ca-Mg-Al oxides

以硝酸盐为前驱体,采用水热法通过改变尿素用量、反应时间、反应温度等合成层状钙镁铝水滑石,再经高温焙烧获得钙镁铝氧化物,探究制备条件对层状钙镁铝氧化物二氧化碳吸附性能的影响。采用X射线衍射、扫描电镜以及热重分析等对样品的结构形貌及二氧化碳吸附性能进行分析。结果表明,尿素用量、反应时间、反应温度对所合成层状钙镁铝氧化物的吸附性能呈倒U型关系,且当尿素用量为72 mmol、反应时间为12 h、反应温度为120℃时,所合成的钙镁铝氧化物具有优异的二氧化碳吸附容量。

Layered Ca-Mg-Al oxides were prepared by calcination of Ca-Mg-Al hydrotalcite at high tempera-ture through changing the preparation conditions,such as urea dosage,reaction time and reaction temperature,to obtain the effect of preparation conditions on carbon dioxide adsorption properties of Ca-Mg-Al oxides.The structure,morphology and adsorption performance of the samples were characterized by X-ray diffraction,scan-ning electron microscope and thermogravimetric analysis,respectively.The results showed that preparation con-ditions had an inverted U-shaped relationship with the adsorption properties of Ca-Mg-Al oxides,and the ad-sorbent prepared using urea of 72 mmol for 12 h at 120℃had an excellent carbon dioxide adsorption capacity.