Regeneration Kinetics Study of Fe₂O₃ Desulfurization Sorbents in SO₂ Atmosphere

Abstract:

The influences of the regeneration temperature and SO₂volume fraction on regeneration kinetics behavior of Fe₂O₃ sorbent as a high-temperature desulfurization sorbent were researched by TGA (Thermos gravimetric analyzer) in this work. The main regeneration product of iron oxide desulfurization sorbent was Fe₂O₃ and sulfur in SO₂ atmosphere which has an important practical significance for pollution control of H₂Sandrecycleofsulfur. The results indicate that Fe₂O₃ desulfurization sorbent was completely regenerated at temperature of 725-775 °C and the higher regeneration temperature and volume fraction of SO₂ is benefit to improve regeneration reaction rate. The regeneration reaction of Fe₂O₃ sorbent in SO₂ atmosphere can be first order reaction obtained by the equivalent grain model, and the controlling process of regeneration reaction is change from the chemical reaction control to the diffusion control in the whole regeneration process. The chemical reaction apparent activation energy and the corresponding frequency factor of chemical reaction are 145.31 kJ/mol and 0.0063 m/s, respectively. And that of diffusion are 50.73 kJ/mol and 4.38×10^-3 m²/s, respectively.

• Periodical: Materials Science Forum (Volume 859)
• Pages: 146-152
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.859.146
• Online since: May 2016
• Authors: Xiao Wei Zhao, Shang Guan Ju*, Hui Qing Wang, Li Ping Liu, Jie Mi
• Keywords: Kinetics, Regeneration, Sulfur Dioxide

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