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Cu–Mn and Co–Mn catalysts synthesized from hydrotalcites and their use in the oxidation of VOCs

Paper ID Volume ID Publish Year Pages File Format Full-Text
46837 46450 2011 7 PDF Available
Title
Cu–Mn and Co–Mn catalysts synthesized from hydrotalcites and their use in the oxidation of VOCs
Abstract

Mixed oxides of the Cu/Mn/Mg/Al and Co/Mn/Mg/Al type were obtained by means of the thermal decomposition of hydrotalcites, with manganese as the main active phase and with variations in their content by means of the addition of Cu or Co (molar ratio Cu/Mn or Co/Mn between 0.05 and 0.5). The effect of a second active phase on the material was evaluated in the total oxidation of three volatile organic compounds, VOCs (toluene, ethanol and butanol). The catalysts were characterized by means of X-ray fluorescence (XRF), X-ray diffraction (XRD), temperature-programmed reduction with hydrogen (TPR-H2) and physisorption of nitrogen at 77 K. All the solids were active in the oxidation reaction of the VOCs, where the scale of difficulty to oxidize the different organic compounds evaluated was: butanol < ethanol < toluene. The use of mixed active phases optimized the physicochemical and catalytic properties compared with the system derived exclusively from manganese. The Co–Mn catalysts being the most active; this behavior is associated to the generation of amorphous phases and redox cycles as a consequence of the cooperative effect among the metals.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► The solids were evaluated in the total oxidation of three different VOCs. ► The structural composition play a determining role in the catalytic behavior. ► The transition metals avoid the formation of intermediaries (more selective to CO2). ► Cu or Co with Mn promotes low crystalline phases and optimizes the redox properties.

Keywords
Hydrotalcites; Mixed oxides; Catalytic oxidation; VOCs
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Cu–Mn and Co–Mn catalysts synthesized from hydrotalcites and their use in the oxidation of VOCs
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 104, Issues 1–2, 27 April 2011, Pages 144–150
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us