Abstract
Catalytic activity of a dinuclear manganese-based complex [Mn2IV(μ-O)3L2](PF6)2 (MnMeTACN) (L = 1,4,7-trimethyl-1,4,7-triazacyclononane), and its combination with a polyamine, 1,1,4,7,10,10-hexamethyltriethylenetetramine (HMTETA), was investigated on the oxidation of ethyl linoleate (EL). When MnMeTACN was molecularly mixed with EL in a co-solvent (methanol), MnMeTACN alone was found to be a very active catalyst for the oxidation of unpurifed EL (containing a small amount of hydroperoxides), similar to the catalytic activity of a Co-based catalyst. For purified EL (free of hydroperoxides), the addition of tert-butyl hydroperoxide was necessary to rapidly initiate the EL oxidation. A tentative catalytic cycle for MnMeTACN was proposed on the basis of electrospray ionization mass spectrometry (ESI-MS) investigation. The existence of HMTETA significantly accelerated the decomposition of the formed hydroperoxides into alkoxy free radicals, which in turn led to a high level of volatile aldehyde byproducts due to β-scission reactions.
Original language | English |
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Pages (from-to) | 191-196 |
Number of pages | 6 |
Journal | Applied Catalysis A: General |
Volume | 316 |
Issue number | 2 |
DOIs | |
State | Published - Jan 10 2007 |
Scopus Subject Areas
- Catalysis
- Process Chemistry and Technology
Keywords
- Alkyd coating
- Catalytic activity
- Hydroperoxide
- Mn-catalyst
- Oxidation