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Oxidation of nitrogen oxide in hybrid plasma-catalytic reactors based on DBD and Fe2O3*

Published online by Cambridge University Press:  15 February 2013

Indrek Jõgi ,
Kalev Erme ,
Ants Haljaste  and
Matti Laan
Indrek Jõgi*
Affiliation:
Institute of Physics, University of Tartu, Tähe 4, 51010 Tartu, Estonia
Kalev Erme
Affiliation:
Institute of Physics, University of Tartu, Tähe 4, 51010 Tartu, Estonia
Ants Haljaste
Affiliation:
Institute of Physics, University of Tartu, Tähe 4, 51010 Tartu, Estonia
Matti Laan
Affiliation:
Institute of Physics, University of Tartu, Tähe 4, 51010 Tartu, Estonia
*
ae-mail: [email protected]
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Abstract

In the present study, Fe2O3 was used as catalyst for the removal of NO in a hybrid plasma- catalytic reactor. The catalyst was located either directly inside the hybrid plasma-catalytic reactor or in a separate catalytic reactor, which followed ozone producing and injecting plasma reactor. Ozone production in such a reactor was dependent on the state of the electrode surface. The fresh catalyst ensured an order of magnitude smaller ozone concentration in the outlet of the hybrid reactor. After a short treatment of the catalyst with NO2, its ability to destroy ozone diminished but was regained after heating of the reactor up to 100 °C. Similarly to earlier results obtained with TiO2, the removal of NO in the hybrid reactor with Fe2O3 was enhanced compared to that in an ordinary plasma reactor. In the ozone injection reactor, oxidation of NO to NO2 took place with considerably higher efficiency compared to the hybrid reactor. The use of catalyst in the ozonation stage further improved the oxidation of NO2 to N2O5. The time-dependence effects of NO removal during plasma and ozone oxidation were explained by reactions between NO2 adsorbed on surface, with surface-bound NO3 and gas phase NO as the reaction product.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 61 , Issue 2: Topical issue: 13th International Symposium on High Pressure Low Temperature Plasma Chemistry (Hakone XIII). Edited by Nicolas Gherardi, Henryca Danuta Stryczewska and Yvan Ségui , February 2013 , 24305
Copyright
© EDP Sciences, 2013

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Footnotes

*

Contribution to the Topical Issue “13th International Symposium on High Pressure Low Temperature Plasma Chemistry (Hakone XIII)”, Edited by Nicolas Gherardi, Henryca Danuta Stryczewska and Yvan Ségui.

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