Effect of CO2/O2 on Catalytic Reduction of NO by Iron

A Long Su; Ya Xin Su; Hao Cheng

doi:10.4028/www.scientific.net/AMR.616-618.1849

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 616-618Effect of CO2/O2 on Catalytic Reduction of NO by...

Effect of CO₂/O₂ on Catalytic Reduction of NO by Iron

Abstract:

This paper presents the results of the reaction between metallic iron mesh rolls and NO in the presence of CO₂/O₂ at different temperatures. All experiments were carried out in a ceramic tube controlled by the temperature programmed electrical furnace. About 99% NO reduction was achieved when temperature was above 700°C in the absence of CO₂/O₂. Results showed that CO₂ in the flue gas had little effect on the NO reduction. NO reduction efficiencies were observed to exceed 95% for all CO₂ concentrations at above 700°C. The addition of O₂, however, caused a sudden drop by about 76% in NO reduction efficiency. Scanning electron microscope (SEM) results showed that the oxidation of iron in O₂ atmosphere led to a more continuous and impervious oxide layer than that in CO₂ atmosphere. Results using X-ray diffraction (XRD) to detect the iron samples after reactions revealed that FeO, Fe₃O₄, Fe and Fe₂O₃ were formed in CO₂ atmosphere, but Fe₃O₄ and Fe₂O₃ were formed when O₂ was added.

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Periodical:

Advanced Materials Research (Volumes 616-618)

Pages:

1849-1852

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.616-618.1849

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Online since:

December 2012

Authors:

A Long Su, Ya Xin Su, Hao Cheng

Keywords:

CO₂/O₂ Atmosphere, Iron, NO Reduction

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