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Catalytic oxidation of 1,2-dichlorobenzene over CaCO3/α-Fe2O3 nanocomposite catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
40596 45859 2013 9 PDF Available
Title
Catalytic oxidation of 1,2-dichlorobenzene over CaCO3/α-Fe2O3 nanocomposite catalysts
Abstract

CaCO3/α-Fe2O3 nanocomposites were synthesized by one-pot method to develop a low-cost and environmentally friendly technology for the catalytic oxidation of 1,2-dichlorobenzene (o-DCB), a model of chlorinated volatile organic compounds. The nanocomposites were characterized by FAAS, XRD, N2 adsorption/desorption, TEM and XPS. Activity measurements were conducted in the range of 200–500 °C, in both the presence and absence of water. Among the tested catalysts, the nanocomposite with 9.5 mol% Ca showed the highest catalytic activity, which could be attributed to the promoting effect of CaCO3 on α-Fe2O3 with smaller crystallite size. Experimental results in the presence of water indicated that, due to the competitive adsorption of water on the active sites, there was a local minimum of catalytic activity at 350 °C. In situ FTIR experimental results revealed the presence of phenolate, catecholate, o-benzoquinone, carboxylate and anhydride type species on the surfaces of the catalysts during the oxidation of o-DCB. Spectral evidence discovered that the formate species were more prone to being formed on the surface of nanocomposite with 9.5 mol% Ca and then were further oxidized to CO, which directly lead to high activity of the catalyst. A mechanism involving dissociative adsorption of o-DCB on the surface of catalyst was proposed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (142 K)Download as PowerPoint slideHighlights► Low-cost and environmentally friendly CaCO3/α-Fe2O3 nanocomposites were synthesized. ► Catalytic oxidation of 1,2-dichlorobenzene was carried out as a model reaction. ► Nanocomposite with 9.5 mol% Ca showed the highest catalytic activity. ► In situ FTIR studies were performed simulating the conditions of reactivity test. ► A two-step redox mechanism of decomposition of 1,2-dichlorobenzene was proposed.

Keywords
Chlorinated volatile organic compounds; 1,2-Dichlorobenzene; Catalytic oxidation; CaCO3; Fe2O3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 450, 15 January 2013, Pages 143–151
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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
Online Support
Any Questions? feel free to contact us