镍铝基柱撑蒙脱石的制备及孔道结构研究

PREPARATION AND RESEARCH ON THE CHANNEL STRUCTURE OF Ni-Al-PILLARED MONTMORILLONITE

以钠基蒙脱石为原料,采用共聚法合成镍铝柱化剂,利用离子交换法制备镍铝基柱撑蒙脱石。通过研究不同镍铝物质的量比例和不同NaOH的量对柱撑蒙脱石制备的影响,并对其孔道结构进行探讨。XRD结果表明,当镍铝物质的量比为1∶6、加入75mlNaOH时,可得到(001)面网层间距达1.8940nm的镍铝基柱撑蒙脱石。FT-IR显示,镍铝基聚合羟基阳离子进入蒙脱石层间,柱撑蒙脱石的基本结构并未发生改变。对柱撑前后蒙脱石的比表面积和孔径结构进行分析,发现镍铝基柱撑蒙脱石比表面积为169.68m2/g,平均孔径为4.120nm,说明镍铝基柱撑蒙脱石具有较大的比表面积,较小且均匀的孔径分布,是一种合适的催化和吸附材料。

Ni/Al-pillared montmorillonite was prepared by using Na-montmorillonites as starting materials.Ni/Al-pillared agent was synthesized by copolymerization and Ni/Al pillared-montmorillonite was prepared by ion-exchange method.The effect of Ni/Al molar ratio and measurement of NaOH on Ni/Al pillared montmorillonite was investigated.Characterization by XRD indicated that when the molar ratio of Ni2＋ and Al3＋ was 1∶6 and the volume of 0.4 mol/L NaOH was 75 ml,the d（001）value of the pillared montmorillonite reached its maximum.The FT-IR results of Ni/Al-montmorillonite showed that the Ni/Al polyoxocations had already inserted into the montmorillonite and the basic structure of montmorillonite remained unchanged.BET analysis indicated that Ni/Al-montmorillonite had larger specific area and smaller pore distribution.It was a useful catalysis and absorbent adsorbent materials