Catalytic oxidation of formaldehyde by ruthenium multisubstituted tungstosilicic polyoxometalate supported on cellulose/silica hybrid

authors	Gamelas, JAF; Oliveira, F; Evtyugina, MG; Portugal, I; Evtuguin, DV
nationality	International
journal	APPLIED CATALYSIS A-GENERAL
author keywords	Cellulose/silica hybrids (CSH); Ruthenium-substituted polyoxometalate; Formaldehyde oxidation; Heterogeneous catalysis; Air purification
keywords	AEROBIC OXIDATION; ENVIRONMENTAL APPLICATIONS; MOLECULAR-OXYGEN; SILICA; CLUSTERS; CHEMISTRY
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.
publisher	ELSEVIER SCIENCE BV
issn	0926-860X
year published	2016
volume	509
beginning page	8
ending page	16
digital object identifier (doi)	10.1016/j.apcata.2015.10.003
web of science category	Chemistry, Physical; Environmental Sciences
subject category	Chemistry; Environmental Sciences & Ecology
unique article identifier	WOS:000367767900002