【摘要】 为了提高碱金属盐修饰的MgO基CO₂吸附剂的吸附循环稳定性,采用添加CaCO₃的方法进行改性。分别以碱式碳酸镁和柠檬酸镁作为前驱体制备MgO,与采用尿素水解沉积法制备的CaCO₃混合,并浸渍碱金属盐制备一系列不同CaCO₃含量的改性MgO基吸附剂。通过热重分析仪（TGA）考察CO₂的吸附性能。结果表明,当吸附气体含40%CO₂、CaCO₃质量分数为5%时,吸附剂的初次吸附容量可达0.63 g·g^-1,且在20次循环后,吸附容量仍可达到0.50 g·g^-1。利用扫描电子显微镜（SEM）、X射线衍射仪（XRD）等方法对吸附剂进行表征分析发现,活性组分MgO的颗粒越小,吸附剂的吸附性能越好;且CaCO₃的添加能在一定程度上限制碱金属盐的高温下流动,从而提高吸附剂的吸附循环稳定性。更多还原

【Abstract】 In order to improve the adsorption cycle stability of alkali metal salt-modified MgO-based C02 adsorbents,CaCO₃ was used for its modification.MgO was prepared using basic magnesium carbonate and magnesium citrate as precursors,mixed with CaCO₃ from urea hydrolysis deposition,and impregnated with alkali metal salt to prepare a series of MgO-based adsorbents modified with CaCO₃.The adsorption performance of CO₂ was investigated by a thermo gravimetric analyzer（TGA）.The results show that when the gas contains 40% CO₂ and content 5% of CaCO₃ was added,the initial adsorption capacity of the adsorbent can reach 0.63 g·g^-1,and the adsorption capacity can still reach 0.50 g·g^-1 after 20 cycles.Scanning electron microscope（SEM） and X-ray diffractometer（XRD） were used to characterize the adsorbents.The adsorption performance was better with smaller particles of active component MgO.The addition of CaCO₃ can limit the flow of the alkali metal salt at a high temperature,thereby improving the adsorption cycle stability of the adsorbents.更多还原