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Synthesis, characterization of cobalt(II) complex nanoparticles encapsulated within nanoreactors of zeolite-Y and their catalytic activities

✍ Scribed by Masoud Salavati-Niasari

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
477 KB
Volume
310
Category
Article
ISSN
1381-1169

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✦ Synopsis

Cobalt(II) complex nanoparticles of [14]aneN 4 : 1,5,8,12-tetraaza-2,9-dioxo-4,11-diphenylcyclotetradecane; [16]aneN 4 : 1,5,9,13-tetraaza-2,10-dioxo-4,12-diphenylcyclohexadecane; Bzo 2 [14]aneN 4 : dibenzo-1,5,8,12-tetraaza-2,9-dioxo-4,11-diphenylcyclotetradecane and Bzo 2 [16]aneN 4 : dibenzo-1,5,9,13-tetraaza-2,10-dioxo-4,12-diphenylcyclohexadecane have been encapsulated in the nanopores of zeolite-Y by a two-step process in the liquid phase: 2+ -NaY; in the nanopores of the zeolite-Y, and (ii) in situ condensation of the cobalt(II) precursor complex with ethylcinnamate. The new complex nanoparticles entrapped in the nanoreactor of zeolite-Y were characterized by several techniques: BET, chemical analysis and spectroscopic methods (FT-IR, UV-vis, XRD, and DRS). These complexes (neat and encapsulated) were used for epoxidation of styrene with O 2 as oxidant in different solvents. Electronic spectra of the reaction mixture indicated that the oxidation proceeds through a free radical mechanism.

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