Mixed spinel ferrites as novel sorbents for CO{sub 2} and other contaminants from coal-derived flue gases
- Univ. of Nevada, Reno, NV (United States)
This paper discusses a novel process currently being developed at the University of Nevada-Reno. The process uses a novel class of sorbents [mixed spinel ferrites Cu{sub x}Mg{sub y}Zn{sub z}Fe{sub (3{minus}x+y+z)}O{sub 4}] prepared from heavy metal contaminated Berkeley Pit water (Butte, Montana) by a proprietary process. Preliminary analysis indicates that these sorbents yield greater sulfur capturing kinetics and capacity as compared to simple zinc ferrite. Also, the same mixed spinel ferrites when used in activated form (cation-excess mixed spinel ferrite) can yield almost complete decomposition of CO{sub 2} into C. Furthermore, the thermodynamic analysis is presented which establishes them as potential decomposers for NO{sub x}. this analysis establishes the fact that simultaneous cleanup of CO{sub 2}/SO{sub 2}/NO{sub x}/H{sub 2}S is possible using these simple and inexpensive sorbents. Finally, a conceptual integrated cleanup system for coal-derived flue gases is presented. In the first stage, SO{sub 2}/NO{sub x}/H{sub 2}S could be treated by mixed spinel ferrites. In the second stage, after regeneration, the same mixed spinel ferrites in activated form can be successfully used for CO{sub 2} capture. Possible applications of carbon loaded spinel ferrites are discussed, such as their use in synthesis of CH{sub 4} gas and as catalyst for H{sub 2} generation.
- OSTI ID:
- 52043
- Report Number(s):
- CONF-940930--
- Country of Publication:
- United States
- Language:
- English
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