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http://hdl.handle.net/10773/19684
Title: | Catalytic oxidation of formaldehyde by ruthenium multisubstituted tungstosilicic polyoxometalate supported on cellulose/silica hybrid |
Author: | Gamelas, J. A. F. Oliveira, F. Evtyugina, M. G. Portugal, I. Evtuguin, D. V. |
Keywords: | AEROBIC OXIDATION ENVIRONMENTAL APPLICATIONS MOLECULAR-OXYGEN SILICA CLUSTERS CHEMISTRY |
Issue Date: | 2016 |
Publisher: | ELSEVIER SCIENCE BV |
Abstract: | Cellulose/silica hybrid material produced by a sol-gel method from cellulosic fibres and silica precursors (tetraethoxysilane and 3-aminopropyltriethoxysilane) was functionalized with alpha-[SiW9O37Ru3III(H2O)(x)Cl3-x]((10-x)-) (Ru-POM), and thoroughly characterised by C-13 and Si-29 solid state NMR, FTIR spectroscopy, UV-vis reflectance spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy (SEM), and chemical analysis. The supported Ru-POM exhibited catalytic activity for the gas phase heterogeneous aerobic oxidation of formaldehyde (ca. 830 ppm in polluted air) at room temperature, in a packed-bed reactor operating at a linear velocity ca. 0.33 m/s and ca. 0.5 s residence time. Maximum formaldehyde uptake was 1.10 g/min per kg of hybrid material doped with Ru-POM (ca. 1.4% w/w). More than 400 turnovers were achieved without significant loss of catalytic activity and the only detected oxidation products of formaldehyde were carbon dioxide and water. A plausible mechanism for the catalytic oxidation of formaldehyde by supported Ru-POM has been proposed and includes formaldehyde oxidation in oxygenated ruthenium complex. (C) 2015 Elsevier B.V. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19684 |
DOI: | 10.1016/j.apcata.2015.10.003 |
ISSN: | 0926-860X |
Publisher Version: | 10.1016/j.apcata.2015.10.003 |
Appears in Collections: | CICECO - Artigos |
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Catalytic oxidation of formaldehyde by ruthenium multisubstituted tungstosilicic polyoxometalate supported on cellulosesilica hybrid_10.1016j.apcata.2015.10.003.pdf | 797.92 kB | Adobe PDF |
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