Transition Metal Oxide Pillared Clay: 1. A Comparative Study of Textural and Acidic Properties of Fe(III) Pillared Montmorillonite and Pillared Acid Activated Montmorillonite
✍ Scribed by T. Mishra; K.M. Parida; S.B. Rao
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 138 KB
- Volume
- 183
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
clays, iron oxide pillared clay has gained considerable impor-Fe(III) pillared montmorillonite samples have been prepared tance as it can be used in demetalization ( 12), reduction of NO by intercalating trinuclear acetato hydroxy-iron (III) nitrate by NH 3 (13), and Fischer-Tropsch (14) reactions. Further, it [Fe(COOCH 3 ) 7 OH 2H 2 O] / NO 0 3 between the layers of both Nawas reported that iron oxide pillars can be converted to stable exchanged and acid-activated montmorillonite, followed by sulfide pillars without any structural change (15).
calcination and characterized by various techniques. The multistep
Iron oxide pillared clays have been prepared by many ion exchange process gave better complex loading than the single methods (12, 16). However, the use of trinuclear iron (III) step process. FTIR and Mo ¨ssbauer spectral analysis showed the acetato cation as a pillaring agent has been proved to be presence of the complex inside the silicate layers. Materials prehelpful in obtaining thermally stable pillared clay (8,17).
pared from the two starting materials are thermally stable up to 500ЊC, having basal spacings of 18.0 and 17.6 A ˚and high surface To date, most attempts at improving and controlling the areas of 284 and 276 m 2 /g, respectively. The acid-activated pilacidity of pillared clays have concentrated on changing the lared montmorillonite shows somewhat low complex intake, but type of host matrix (19). By changing the host matrix, has high acidity in comparison to the Na-exchanged material. Brønsted acidity cannot be increased substantially, as most