Xavier, K O; Dr.Mohammed Yusuff,K K(Cochin University of Science & Technology, June , 2000)
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Abstract:
Zeolite encapsulated transition metal complexes have received wide attention as an
effective heterogenized system that combines the tremendous activity of the metal
complexes and the attractive features of the zeolite structure. Zeolite encapsulated
complexes offer a bright future for attempts to replace homogeneous systems retaining
its catalytic activity and minimizing the technical problems. especially for the partial
oxidation of organic compounds. Studies on some zeolite encapsulated transition metal
complexes are presented in this thesis. The ligands selected are technically important in a
bio-mimetic or structural perspective. Attempts have been made in this study to
investigate the composition, structure and stability of encapsulated complexes using
available techniques. The catalytic activity of encapsulated complexes was evaluated for
the oxidation of some organic compounds. The recycling ability of the catalyst as a
result of the encapsulation was also studied.Our studies on Cu-Cr/Al2O3, a typical metal oxide catalyst. illustrate the use of
design techniques to modify the properties of such conventional catalysts. The catalytic
activity of this catalyst for the oxidation of carbon monoxide was measured. The effect
of additives like Ce02 or Ti02 on the activity and stability of this system was also
investigated. The additive is potent to improve the activity and stability ofthe catalyst so
as to be more effective in commercial usage.
Description:
Department of Chemical Oceanography,
Cochin University of Science
and Technology