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化工学报  2015 

Al-MCM-41介孔分子筛吸附喹啉的性能

DOI: 10.11949/j.issn.0438-1157.20150817, PP. 3597-3604

Keywords: MCM-41介孔分子筛,表征,喹啉,吸附,热力学,动力学

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Abstract:

在碱性条件下,采用水热晶化法,以偏硅酸钠为硅源,铝酸钠为铝源,CTAB为结构模板剂,成功合成出了含铝介孔分子筛Al-MCM-41。采用XRD、BET等手段对合成的Al-MCM-41进行表征,对柴油中的氮化物喹啉进行了吸附实验,考察了Al-MCM-41介孔分子筛对氮化物喹啉的吸附能力,探究了硅铝比为60的Al-MCM-41分子筛对喹啉溶液吸附的热力学和动力学行为,测得353.15~393.15K温度范围内的吸附等温线数据,用Langmuir、Freundlich方程对此进行拟合,并根据热力学原理计算得到吸附过程中的ΔH、ΔG、ΔS值和吸附表观活化能。结果表明,硅铝比为60的Al-MCM-41具有较大的孔容、比表面积和较窄的孔径分布,结晶度和有序性高。等温吸附平衡符合Freundlich等温线模型,其ΔH-0.7682kJ·mol-1,ΔG-28.1215kJ·mol-1,ΔS73.2434J·mol-1·K-1,吸附动力学符合Pseudo拟二级方程,Ea为2.8575kJ·mol-1。

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