Rahna,K Shamsudeen; Dr.Sugunan, S(Cochin University of Science & Technology, December , 2001)
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Abstract:
In the present study, we have prepared and evaluated the physical and
chemical properties and catalytic activities of various single, mixed and modified
pillared montmorillonites. The single oxide pillared clays include AI-, Fe- and Cr-pillared
montmorillonites. The mixed oxide pillared montmorillonites such as Fe-AI
and Cr-AI pillared systems with various Fe(Cr)/Al ratios are also prepared.
Modification of iron-pillared system is done by vanadia impregnation.
Characterisation using various physico-chemical techniques and a detailed study of
acidic properties are also carried out. Major part of our work is oriented to evaluate
the catalytic activity of the pillared systems towards certain important catalytic
reactions. Our samples are found to be excellent catalysts for the reactions namely
Friedel-Crafts benzylation and benzoylation, methylation of aniline and catalytic wet
peroxide oxidation of phenol.
Description:
Department of Applied Chemistry,
Cochin University of Science and Technology
Joseph, Lyjo K; Dr. Radhakrishnan, P; Dr.Nampoori,V P N(Cochin University of Science & Technology, November , 2009)
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Abstract:
Nondestructive photothermal methods as well as optical absorption and fluorescence spectroscopy are utilized to characterise three different materials, both thermally and optically. The possibility of using montmorillonite clay minerals, after textile waste-water treatment, is investigated for further applications. The laser induced luminescence studies and thermal characterisation of certain rare earth titanates prepared by self propagating high temperature synthesis method are also presented. Moreover, effort is made to characterise rare earth doped sol gel silica glasses with the help of these nondestructive techniques.
Description:
International School of Photonics, Cochin University of Science and Technology