TY - JOUR
T1 - Development of iron oxide sorbents for Hg0 removal from coal derived fuel gas
T2 - Sulfidation characteristics of iron oxide sorbents and activity for COS formation during Hg0 removal
AU - Wu, Shengji
AU - Oya, Naoki
AU - Ozaki, Masaki
AU - Kawakami, Junichi
AU - Uddin, Md Azhar
AU - Sasaoka, Eiji
N1 - Funding Information:
This work was partly supported by the Steel Industrial Foundation for Advancement of Environmental Protection Technology, 21th COE program of Okayama University, and a Grant-in-Aid for Scientific Research on Priority Areas (B) from Ministry of Education, Science, Sports and Culture, Japan (No. 18310056). The JSPS is gratefully acknowledged for the financial support and postgraduate scholarship for Shengji Wu in this project.
PY - 2007/12
Y1 - 2007/12
N2 - The aim of this study is to develop a process for the removal of Hg0 using H2S over iron oxides sorbents, which will be located just before the wet desulfurization unit and catalytic COS converter of a coal gasification system. It is necessary to understand the reactions between the iron oxide sorbent and other components of the fuel gas such as H2S, CO, H2, H2O, etc. In this study, the sulfidation behavior and activity for COS formation during Hg0 removal from coal derived fuel gas over iron oxides prepared by precipitation and supported iron oxide (1 wt% Fe2O3/TiO2) prepared by conventional impregnation were investigated. The iron oxide samples were dried at 110 °C (designated as Fe2O3-110) and calcined at 300 and 550 °C (Fe2O3-300 and Fe2O3-550). The sulfidation behavior of iron oxide sorbents in coal derived fuel gas was investigated by thermo-gravimetric analysis (TGA). COS formation during Hg0 removal over iron oxide sorbents was also investigated using a laboratory-scale fixed-bed reactor. It was seen that the Hg0 removal activity of the sorbents increased with the decrease of calcinations temperature of iron oxide and extent of sulfidation of the sorbents also increased with the decrease of calcination temperature. The presence of CO suppressed the weight gain of iron oxide due to sulfidation. COS was formed during the Hg0 removal experiments over Fe2O3-110. However, in the cases of calcined iron oxides (Fe2O3-300, Fe2O3-550) and 1 wt% Fe2O3/TiO2, formation of COS was not observed but the Hg0 removal activity of 1 wt% Fe2O3/TiO2 was high. Both FeS and FeS2 were active for Hg0 removal in coal derived fuel gas without forming any COS.
AB - The aim of this study is to develop a process for the removal of Hg0 using H2S over iron oxides sorbents, which will be located just before the wet desulfurization unit and catalytic COS converter of a coal gasification system. It is necessary to understand the reactions between the iron oxide sorbent and other components of the fuel gas such as H2S, CO, H2, H2O, etc. In this study, the sulfidation behavior and activity for COS formation during Hg0 removal from coal derived fuel gas over iron oxides prepared by precipitation and supported iron oxide (1 wt% Fe2O3/TiO2) prepared by conventional impregnation were investigated. The iron oxide samples were dried at 110 °C (designated as Fe2O3-110) and calcined at 300 and 550 °C (Fe2O3-300 and Fe2O3-550). The sulfidation behavior of iron oxide sorbents in coal derived fuel gas was investigated by thermo-gravimetric analysis (TGA). COS formation during Hg0 removal over iron oxide sorbents was also investigated using a laboratory-scale fixed-bed reactor. It was seen that the Hg0 removal activity of the sorbents increased with the decrease of calcinations temperature of iron oxide and extent of sulfidation of the sorbents also increased with the decrease of calcination temperature. The presence of CO suppressed the weight gain of iron oxide due to sulfidation. COS was formed during the Hg0 removal experiments over Fe2O3-110. However, in the cases of calcined iron oxides (Fe2O3-300, Fe2O3-550) and 1 wt% Fe2O3/TiO2, formation of COS was not observed but the Hg0 removal activity of 1 wt% Fe2O3/TiO2 was high. Both FeS and FeS2 were active for Hg0 removal in coal derived fuel gas without forming any COS.
KW - COS formation
KW - Coal derived fuel gas
KW - Hg removal
KW - Iron oxide
KW - Sulfidation
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U2 - 10.1016/j.fuel.2007.03.004
DO - 10.1016/j.fuel.2007.03.004
M3 - Article
AN - SCOPUS:35548977495
VL - 86
SP - 2857
EP - 2863
JO - Fuel
JF - Fuel
SN - 0016-2361
IS - 17-18
ER -