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Highly active spinel type CoCr2O4 catalysts for dichloromethane oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
45578 46416 2015 10 PDF Available
Title
Highly active spinel type CoCr2O4 catalysts for dichloromethane oxidation
Abstract

•Spinel type CoCr2O4 oxides were very active for dichloromethane oxidation.•Catalytic performance was dependent on surface acidity and reducibility of the catalyst.•Kinetic study implied similar reaction pathways on these catalysts.•In situ FTIR results revealed the formate species as the main reaction intermediates.

A series of spinel type CoCr2O4 catalysts calcined at different temperatures were prepared and tested for oxidation of dichloromethane (CH2Cl2). These catalysts were active for this reaction. The final products in the reaction were COx, HCl and Cl2, without the formation of Cl-containing organics. The best performance was obtained on a catalyst calcined at 400 °C (CoCr2O4-4), with a T50 of 218 °C and a T90 of 257 °C, which was mainly due to the highest surface area of this catalyst (91.3 m2 g−1). Detailed quantitative analyses revealed that the catalytic behavior was synergistically governed by surface acidity and reducibility of the catalyst, as evidenced by ammonia temperature-programmed desorption and hydrogen temperature-programmed reduction results, respectively. Kinetic studies revealed similar activation energies (124.5–155.5 kJ mol−1) on these catalysts, implying the reaction might follow the same pathways on these catalysts. More importantly, in situ Fourier transform infrared spectroscopic investigation of the reaction revealed that formate species were the main reaction intermediates, which could be further oxidized to CO and CO2.

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Keywords
Dichloromethane oxidation; Spinel type oxide; CoCr2O4 catalysts; Formate species.
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Highly active spinel type CoCr2O4 catalysts for dichloromethane oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 165, April 2015, Pages 477–486
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