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Regenerable cobalt oxide loaded magnetosphere catalyst from fly ash for mercury removal in coal combustion flue gas.
- Source :
-
Environmental science & technology [Environ Sci Technol] 2014 Dec 16; Vol. 48 (24), pp. 14837-43. Date of Electronic Publication: 2014 Dec 02. - Publication Year :
- 2014
-
Abstract
- To remove Hg(0) in coal combustion flue gas and eliminate secondary mercury pollution of the spent catalyst, a new regenerable magnetic catalyst based on cobalt oxide loaded magnetospheres from fly ash (Co-MF) was developed. The catalyst, with an optimal loading of 5.8% cobalt species, attained approximately 95% Hg(0) removal efficiency at 150 °C under simulated flue gas atmosphere. O2 could enhance the Hg(0) removal activity of magnetospheres catalyst via the Mars-Maessen mechanism. SO2 displayed an inhibitive effect on Hg(0) removal capacity. NO with lower concentration could promote the Hg(0) removal efficiency. However, when increasing the NO concentration to 300 ppm, a slightly inhibitive effect of NO was observed. In the presence of 10 ppm of HCl, greater than 95.5% Hg(0) removal efficiency was attained, which was attributed to the formation of active chlorine species on the surface. H2O presented a seriously inhibitive effect on Hg(0) removal efficiency. Repeated oxidation-regeneration cycles demonstrated that the spent Co-MF catalyst could be regenerated effectively via thermally treated at 400 °C for 2 h.
- Subjects :
- Air Pollution prevention & control
Catalysis
Coal
Coal Ash chemistry
Hydrochloric Acid chemistry
Magnetic Phenomena
Nitric Oxide chemistry
Oxidation-Reduction
Oxygen chemistry
Power Plants
Recycling
Sulfur Dioxide chemistry
Air Pollutants chemistry
Cobalt chemistry
Mercury chemistry
Oxides chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1520-5851
- Volume :
- 48
- Issue :
- 24
- Database :
- MEDLINE
- Journal :
- Environmental science & technology
- Publication Type :
- Academic Journal
- Accession number :
- 25403026
- Full Text :
- https://doi.org/10.1021/es504419v