CIESC Journal ›› 2013, Vol. 64 ›› Issue (7): 2580-2586.doi: 10.3969/j.issn.0438-1157.2013.07.037

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Preparation and characterization of manganese-based regenerable sorbents for high temperature H2S removal

GUO Jing, WANG Ju, LIANG Bin   

  1. College of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China
  • Received:2012-11-11 Revised:2013-01-26 Online:2013-07-05
  • Supported by:

    supported by the National Natural Science Foundation of China (50876121).

Abstract: High temperature desulfurization of coal gas is a key step of integrated gasification combined cycle (IGCC)and direct reduced iron (DRI)production,which directly influences the global thermal efficiency.Manganese-based sorbents with different Mn-contents were prepared by coprecipitation method for the high temperature sulfur removal.Precipitation was conducted by neutralizing the mixed solution of manganese nitrate and alumina nitrate with 10% NH3·H2O at 50℃.And the pH value in precipitation was kept around 9.The sorbents prepared were tested in a fixed-bed reactor by sulfidation-regeneration cycles.XRD,SEM and BET were used to characterise the structural change of the sorbents during the cycles.The sorbents made by coprecipitation method have good Mn/Al dispersibility.The desulfurization reaction at 850℃ was rapid and quantitative.The sulfur capacity increased linearly with increase of manganese content in the sorbents.The S/Mn atomic ratio was within 0.90—0.95 after sulfurization.The sulfur capacity was not influenced by space velocity and H2S content in feed gas.The sulfided sorbent was regenerated using diluted air containing 3% O2 at 850℃.The sulfur capacity was stable after many cycles.So,the sorbents could be used as regenerable sulfur sorbents for high temperature H2S removal.

Key words: high temperature H2S removal, manganese-based regenerable sorbents, coprecipitation

CLC Number: 

  • TQ546.5
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