XRD/SEM/EDS Analysis of Iron Surface after NO Reduction with CH₄ in N₂ and SO₂ Atmosphere

Abstract:

NO reduction by iron was conducted in a one-dimensional ceramic tubular reactor at 300 - 1100 °C in N₂ and simulated flue gas atmosphere with 0.4% methane and 0.01%~0.04% SO₂. The evolution of metallic iron was investigated by X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and energy dispersive spectrum (EDS) methods. The results showed that SO₂ did not place negative effect on NO reduction by iron. XRD patterns showed that FeS was formed when there was SO₂ in the flue gas. The iron oxides were FeO and Fe₃O₄ when methane was not and was used as reducing agent respectively. Rough and raised surface making up of a series of round smooth juts was formed over the iron surface after reaction with NO in N₂ atmosphere when there was 0.04% SO₂. Porous surface consisting serried particles was formed when methane was used as reductant. White attachments were found locally on the iron surface when SO₂ existed in the flue gas, which was proved by EDS analysis to be FeS.

• Periodical: Advanced Materials Research (Volumes 955-959)
• Pages: 2392-2396
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.955-959.2392
• Online since: June 2014
• Authors: Yue Zhou Qi, Ya Xin Su*, Wen Yi Deng
• Keywords: CH₄, Iron, NO Reduction, SO₂, XRD/SEM

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