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化工学报  2015 

高岭土-硅酸锂的制备及其吸附CO2动力学

DOI: 10.11949/j.issn.0438-1157.20150896, PP. 3712-3718

Keywords: 高岭土,正硅酸锂,浸渍沉淀法,二氧化碳,动力学

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Abstract:

以煤系高岭土为硅源,采用浸渍沉淀法制备硅酸锂吸附剂。采用X射线衍射仪、扫描电子显微镜分别表征和分析了样品的结构特征和形貌特征,并使用差热-热重联用分析仪研究了硅酸锂吸附CO2的性能。实验结果表明,与以市售-SiO2为硅源制备的硅酸锂相比,高岭土-硅酸锂在较低温度下有明显的吸附CO2优势;采用浸渍沉淀法可成功制备出纯度较高的硅酸锂,最大吸附量为35.7%(704℃)(文中吸附量均为质量分数),高出固相法5.9%;采用双指数模型对硅酸锂吸附CO2进行动力学分析,温度低于600℃时,表面化学反应过程是整个反应过程的控制步骤。高于650℃,锂迁移成为控制步骤。在吸附CO2的过程中,浸渍沉淀法制备的样品锂迁移速率是固相法的1.5~2.2倍,低于650℃时的吸附,浸渍沉淀法的样品表面化学反应速率皆高于固相法。

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