Journal
APPLIED SURFACE SCIENCE
Volume 255, Issue 17, Pages 7610-7617Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2009.04.037
Keywords
Multi-wall carbon nanotubes; Copper(II) salen complex; Heterogeneous catalyst; Oxidation; Ethylbenzene
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Funding
- Council of University of Kashan
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Hydroxyl functionalized copper(II) Schiff-base, N, N'-bis(4-hydroxysalicylidene)-ethylene-1,2-diamine-copper(II), [Cu((OH)(2)-salen)], has been covalently anchored on modified MWCNTs. The new modified MWCNTs ([Cu((OH)(2)-salen)]-MWCNTs) have been characterized by TEM, thermal analysis, XRD, XPS, UV-vis, DRS, FT-IR spectroscopy and elemental analysis. The modified copper(II) MWCNTs solid was used to affect the catalytic oxidation of ethylbenzene with tert-butylhydroperoxide as the oxidant at 333 K. The system is truly heterogeneous (no leaching observed) and reusable (no decrease in activity) in three consecutive runs. Acetophenone was the major product though small amounts of o- and p-hydroxyacetophenones were also formed revealing that C-H bond activation takes place both at benzylic and aromatic ring carbon atoms. Ring hydroxylation was more over the neat'' complexes than over the encapsulated complexes. (C) 2009 Elsevier B.V. All rights reserved.
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