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| Abstract: | The pillared montmorillonite has been prepared by exchanging Na+ in the interlayer of montmorillonite with Al hydroxy cation followed by calcination. Pillared clays are also prepared after exchanging Na' ions with Ce, La, Sm-ions and then pillarcd with aluminium oxides, The surface characterisation of the prepared catalysts has been done using XRD and surface area measurements. To probe the acidic property of the system, temperature programmed desorption (TPD) of NH, has been done. Toluene alkylation by benzyl chloride has been carried out for the evaluation of catalytic activity. The most active system is found to be mixed Al/Zr pillarcd montrnorillonite. |
| URI: | http://dyuthi.cusat.ac.in/purl/2161 |
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| Dyuthi-P0006.pdf | (270.4Kb) |
| Abstract: | The title compound, C21H19N3O2S, exists in the thione form. The configuration about the C N bond is E. The hydrazinecarbothioamide unit adopts an almost planar arrangement, with maximum deviations of 0.016 (3) and 0.016 (2) A ° for the two thiourea N atoms. An intramolecular O—H N hydrogen bond occurs. Weak intermolecular N— H S, C—H O and C—H interactions are observed in the crystal structure |
| Description: | Acta Cryst. (2011). E67, o3420 |
| URI: | http://dyuthi.cusat.ac.in/purl/4701 |
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| (E)-2-(4-Benzyl ... xybenzylidene)-idene)-.pdf | (394.6Kb) |
| Abstract: | Iron pillared Montmorillonite has been synthesised and it is then wet impregnated with vanadia with different vanadia composition. These catalysts are characterised using conventional techniques such as XRD analysis,FTIR analysis and surface area and pore volume measurements. Acidity is measured using spectrophotometric monitoring of adsorption of perylene, thermogravimetric desorption of 2.6 dimethylpyridine and temperature programmed desorption of ammonia. Activity studies are done in the liquid phase. It has been concluded that Lewis acidic sites are responsible for the benzylation of toluene when the benzylating agent is benzyl chloride while Bronsted acidic sites are responsible when the reagent is benzyl alcohol. |
| URI: | http://dyuthi.cusat.ac.in/purl/2215 |
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| Dyuthi-SS18.pdf | (676.6Kb) |
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