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Water-resistant Fe–Ca–Ox/TiO2 catalysts for low temperature 1,2-dichlorobenzene oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
40292 45849 2013 9 PDF Available
Title
Water-resistant Fe–Ca–Ox/TiO2 catalysts for low temperature 1,2-dichlorobenzene oxidation
Abstract

•Low-temperature and water-resistant Fe–Ca–Ox/TiO2 catalysts were synthesized.•The catalyst with 7 wt% Fe–Ca–Ox loading showed the highest catalytic activity.•Ca in the catalyst has dual roles: enhancing the activity and water-resistance.•A mechanism of decomposition of 1,2-dichlorobenzene was proposed.

Fe–Ca–Ox/TiO2 composite catalysts were synthesized to develop a low-temperature and water-resistant technology for the catalytic oxidation of 1,2-dichlorobenzene (o-DCB), as a model of chlorinated volatile organic compounds. The composite catalysts were characterized by XRD, TEM, N2 adsorption/desorption and H2-TPR. Activity measurements were conducted in the range of 200–500 °C, in both the presence and absence of water. It was found that the incorporation of FeOx on TiO2 could significantly improve the catalytic activity, but the activity was remarkably inhibited over a broad temperature range centered at 300 °C due to the existence of water. Simultaneous incorporation of Fe and Ca oxide (Fe–Ca–Ox) on TiO2 could not only further improve the catalytic activity but also enhance the performance of water-resistance in the wet reaction. Among the tested catalysts, the catalyst with Fe–Ca–Ox loading of 7 wt% showed the highest catalytic activity. The total conversion of o-DCB could be obtained at 350 °C, in both the dry and wet reaction. The catalytic oxidation of o-DCB over TiFeCa-7 followed first-order kinetics with an apparent activation energy of 32 kJ/mol. The surface acidity of the catalyst and the intermediate species in the reaction were investigated by in situ FTIR spectroscopy. It is proposed that o-DCB molecule should be preferentially adsorbed on the Lewis acid sites, forming partial oxidation products, which could be subsequently oxidized to form final products.

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Keywords
Chlorinated volatile organic compounds; 1,2-Dichlorobenzene; Catalytic oxidation; Water-resistance; Fe–Ca–Ox/TiO2
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Water-resistant Fe–Ca–Ox/TiO2 catalysts for low temperature 1,2-dichlorobenzene oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 466, 10 September 2013, Pages 68–76
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