Amine-Modified Silica NH2-(CH2)x-SiO2 (x = 0, 2, 3) as Support for Cobalt-Substituted Polyoxometalate TBA4HPW11CoO39: Effect of the Nature of the Support on the Oxidation Activity Full article
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Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169 |
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| Output data | Year: 2010, Volume: 319, Number: 1-2, Pages: 119-125 Pages count : 7 DOI: 10.1016/j.molcata.2009.12.010 | ||||
| Tags | Amino-groups, Immobilization, Oxidation, Polyoxometalates | ||||
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Funding (1)
| 1 | National Research, Development and Innovation Office | HAS-RAS/2008-2010 (No. 32) |
Abstract:
Acidic tetra-n-butylammonium (TBA) salts of Keggin type transition-metal-monosubstituted polyoxometalate TBA4HPW11CoO39 (Co-POM) have been chemically anchored to the amino-modified silica (NH2–(CH2)x–SiO2, x = 0, 2, 3) containing 40–710 μmol NH2-groups per 1 g of support. The interaction of Co-POM with NH2–(CH2)x–SiO2 was studied by DR-UV–vis spectroscopy. Spectroscopic data revealed that the type of interaction between Co-POM and support depends on the amount of anchored functional NH2-groups. It was found that Co-POM was attached to NH2–(CH2)x–SiO2 support both by the electrostatic NH3+⋯Co-POM− and dative (Si–OH⋯Co-POM) bonding. Both the amount of anchored NH2-groups and the distance between NH2-group and surface of silica affect the nature of the interaction between Co-POM and surface functional groups. The increase of the amount of anchored NH2–(CH2)3-groups leads to decrease in the contribution of dative bonding Si–OH⋯Co-POM and an increase in the contribution of electrostatic bonding NH3+⋯Co-POM−. The activity of the immobilized Co-POM was tested in benzyl alcohol oxidation with oxygen in CH3CN medium. It was found that catalytic activity and stability of Co-POM depend on the nature of interaction between Co-POM and surface groups of support that is adjustable both by the amount of anchored functional NH2-groups on silica support and the distance between NH2-group and surface of silica.
Cite:
Panchenko V.N.
, Borbáth I.
, Timofeeva M.N.
, Gőbölös S.
Amine-Modified Silica NH2-(CH2)x-SiO2 (x = 0, 2, 3) as Support for Cobalt-Substituted Polyoxometalate TBA4HPW11CoO39: Effect of the Nature of the Support on the Oxidation Activity
Journal of Molecular Catalysis A: Chemical. 2010. V.319. N1-2. P.119-125. DOI: 10.1016/j.molcata.2009.12.010 WOS Scopus РИНЦ ANCAN OpenAlex
Amine-Modified Silica NH2-(CH2)x-SiO2 (x = 0, 2, 3) as Support for Cobalt-Substituted Polyoxometalate TBA4HPW11CoO39: Effect of the Nature of the Support on the Oxidation Activity
Journal of Molecular Catalysis A: Chemical. 2010. V.319. N1-2. P.119-125. DOI: 10.1016/j.molcata.2009.12.010 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Jun 27, 2009 |
| Accepted: | Dec 21, 2009 |
| Published online: | Dec 29, 2009 |
| Published print: | Mar 17, 2010 |
Identifiers:
| Web of science: | WOS:000275244800015 |
| Scopus: | 2-s2.0-75149115649 |
| Elibrary: | 15315032 |
| Chemical Abstracts: | 2010:134841 |
| Chemical Abstracts (print): | 152:571042 |
| OpenAlex: | W2080649912 |