Comparison of desulfurization kinetics of copper oxide sorbent

Abstract

Desulfurization experiments of CuO, γ-Al₂O₃ and CuO/γ-Al₂O₃ were made in simulated flue gas by means of thermogravimetric analysis. It is found that reaction activities of CuO supported on γ-Al₂O₃ could be highly improved. Desulfurization kinetics of CuO/γ-Al₂O₃ was studied in the temperature range of 250 °C-400 °C and SO2 concentration of 0.1%-0.9%. The experimental data were tested and compared with kinetics models of volume reaction model (VRM), grain size model (GSM), random pore model (RPM) and pore-blocking model (PBM). Correlation analysis shows that VRM and RPM models do not fit experimental data well. GSM contradicts with the changes in the physical and chemical properties of CuO/γ-Al₂O₃ as the desulfurization proceeds. It is found that PBM is consistent with the change of pore structure of CuO/γ-Al₂O₃ sorbent during desulfurization process and predicts the conversion-time curves of the sorbent well. Meanwhile, kinetics parameters are obtained and discussed.

Keywords

copper oxide / desulfurization / kinetics / γ-Al₂O₃

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