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Structure And Catalysis Of Symmetrical And Asymmetrical Metal-complexes In Molecular Sieves

Posted on:2007-09-01Degree:DoctorType:Dissertation
Country:ChinaCandidate:C JinFull Text:PDF
GTID:1101360185476345Subject:Chemical processes
Abstract/Summary:PDF Full Text Request
Cytochrome P-450, a monooxygenase, found in almost all living organisms, is an efficient catalyst for the selective oxidation of organic compounds. This remarkable activity of cytochrome P-450 arises from the highly activated transition metal complexes. Many model systems based on transition metal complexes of porphyrins, phthalocyanines and Schiff bases that can mimic monooxygenase enzymes have been widely investigated. The catalytic activity of the model complexes in homogeneous medium decreases with time due to ligand oxidation or formation of dimeric oxo- and peroxo-bridge complexes. The immobilization of metal complexes on different supports is a good method to isolate the metal complexes to prevent their dimerization and to obtain catalysts which can easily be recovered. In this paper, we describe the immobilization of quasi-porphyrin complexes on Zeolite Y or mesoporous molecular sieve MCM-41 by using different methods. Prepared catalysts are characterized by various physicochemical techniques and catalytic reactions.1. Synthesis, characterization of zeolite Y-encapsulated transition metal...
Keywords/Search Tags:transition metal complexes, molecular sieve, encapsulation, immobilization, oxidation reactions
PDF Full Text Request
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