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- W2061090240 abstract "Intercalation of boehmite species has been carried out in different media for the preparation of alumina pillared montmorillonite (PILC — pillared clays). The effect of different media such as water, water-isopropanol and water-butanol on the intercalation and thermal stability of the resulting pillared montmorillonite is discussed. Montmorillonite intercalated from different media was characterised by chemical analysis, XRD, BET, TGA and DTA. The d-spacing of the basal planes increased from the initial value of 13 Å in montmorillonite to 20–21 Å irrespective of the specific medium, whereas upon heating to 700 °C the d-spacing decreased to 17–15 Å. The minimum reduction of d-spacing is recorded in PILC prepared in water medium. Specific surface area for PILC (water) heated to 300 °C is 220 m2/g and is retained at 175 m2/g even after heating to 700 °C. In the case of PILC (methanol) the specific surface area is 225 m2/g and 117 m2/g after heating to 300 and 700 °C respectively. Further, the surface areas in PILC (isopropanol) and PILC (butanol) are 79 m2/g and 94 m2/g respectively on samples heated at 700 °C. These results suggest the influence of different media of intercalation on the thermal stability of the PILC. The solvent present in the interlayer region influences the reorientation of pillars during the dehydroxylation process. The high surface tension of the water-air interface at the interlayer region compared to other solvent-air interfaces in the present study may be able to orient the boehmite species in between the montmorillonite layers to get a homogeneous distribution of pillars and hence high surface area and porosity at higher temperature." @default.
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- W2061090240 date "1997-05-01" @default.
- W2061090240 modified "2023-09-27" @default.
- W2061090240 title "Influence of medium on the properties of boehmite intercalated montmorillonite" @default.
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- W2061090240 doi "https://doi.org/10.1016/s0167-577x(96)00250-9" @default.
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