From a naturally occurring-clay mineral to the production of porous ceramic membranes
From a naturally occurring-clay mineral to the production of porous ceramic membranes
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DOI：
10.1016/j.micromeso.2018.05.030
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发表时间：
2018-11-15
影响因子：
5.2
通讯作者：
Tijani, Najib
中科院分区：
文献类型：
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作者：
Elgamouz, Abdelaziz;Tijani, Najib
以正硅酸乙酯（TEOS）为硅源，四正丙基溴化铵（TPABr）为模板剂，KOH为矿化剂，采用水热沉积法制备了硅质岩/粘土复合膜。硅质岩沉积在中孔和多孔陶瓷膜载体的表面上，所述多孔陶瓷膜载体由在摩洛哥（梅克内）中部地区大量发现的天然可获得的粘土矿物制成。以纯粘土粉（AS）、粘土与活性炭（5%w/w）的混合物（AC）和粘土与淀粉（20%w/w）的混合物（AA）为原料，通过单轴加压制备了3种平板膜支撑体。研究了膜载体的孔隙率随最终煅烧温度的变化。结果发现，中孔对孔隙率的贡献为25%，然而它们对比表面积的贡献大于90%。研究了介孔结构。XRD证实在粘土平板载体的中孔内形成结晶硅沸石层。通过SEM证实了典型的MFI型沸石形态。的范围和限制的膜之间的SF6和N-2的选择性，进行了讨论。
A silicalite clay composite membrane was produced by hydrothermal deposition using tetraethyl orthosilicate (TEOS) as silica source, tetra-n-propylammonium bromide (TPABr) as template and KOH as mineralizing agent. Silicalite was deposited in the mesopores and on the surface of porous ceramic membrane supports made from a naturally available clay mineral abundantly found in the central region of Morocco (Meknes). Three flat-disc membrane supports were prepared by uniaxial pressure on pure clay powder (AS), mixture of clay and activated carbon (5%, w/w) (AC) and mixture of clay and starch (20% w/w) (AA). The porosity of membrane supports was studied as function of the final calcination temperature. It was found that the mesopores contribution to porosity was 25%, however their contribution to the specific surface area is more than 90%. The mesopores structure was investigated. XRD confirms the formation of crystalline silicalite layers inside the mesopores of the clay flat-disc support. Typical MFI-type zeolite morphology was confirmed by SEM. The scope and limitations of the membranes in terms of selectivity between SF6 and N-2, is discussed.