Characteristics and Regeneration Properties of Manganese Oxide Sorbent under O₂ Atmosphere

Abstract:

The regeneration behavior of manganese oxide sorbent under O₂ atmosphere was investigated in a fixed bed micro-reactor under the influence of different temperatures and O₂ concentrations. The change in phase of the sulfided and the regenerated sorbents was analyzed by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques. MnS, Mn₃O₄ and MnSO₄ were found in regenerated sorbent at 400 °C, which indicated that the regeneration of the sulfided sorbent was not complete, however, MnS was converted to Mn₃O₄, Mn₂O₃ and few MnSO₄ at 800 °C. The manganese sulfate formed during the regeneration but decomposed to Mn₂O₃ at 800 °C. MnS reacts with O₂ to form Mn₃O₄ and MnSO₄, and then MnSO₄ was decomposed at 800 °C. The results show that the optimum regeneration temperature and O₂ concentration obtained from this experiment are 800 °C and 2.2 vol %, respectively, and the regeneration conversion ratio was about 95%.

• Periodical: Materials Science Forum (Volume 859)
• Pages: 134-139
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.859.134
• Online since: May 2016
• Authors: Li Ping Liu, Shang Guan Ju*, Hui Qing Wang, Xiao Wei Zhao, Jie Mi
• Keywords: Manganese Oxide Sorbent, O₂ Atmosphere, Regeneration Properties

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