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Influences of water vapor and fly ash on elemental mercury removal over cerium-oxide-modified semi-coke.
- Source :
-
Fuel . Apr2018, Vol. 217, p211-217. 7p. - Publication Year :
- 2018
-
Abstract
- A bench-scale fixed bed reactor was used to study the influences of water vapor and fly ash on Hg 0 removal efficiency over CeO 2 -modified semi-coke adsorbent (Ce/SC). Adsorption results showed that the mercury removal efficiency of Ce/SC decreased by 30% in the presence of 10% water vapor, and the introduction of 0.5 g fly ash had no significant effect on the Hg 0 removal efficiency of Ce/SC. In the condition of water vapor and fly ash coexisted, the Hg 0 removal efficiency of Ce/SC decreased by only 15%, indicated that the fly ash slowed down the inhibitory effects of water vapor on Hg 0 removal efficiency over Ce/SC, which is mainly due to the interaction between water vapor and Fe 2 O 3 in the fly ash to form Fe-OH groups, furthermore, γ-Fe 2 O 3 exhibited higher Hg 0 removal performance than α-Fe 2 O 3 . Hydrogen temperature-programmed reduction (H 2 -TPR) revealed that the oxidation activity and capacity of α-Fe 2 O 3 and γ-Fe 2 O 3 increased significantly after water vapor treatment. X-ray photoelectron spectroscopy (XPS) results showed that the Fe-OH content of α-Fe 2 O 3 and γ-Fe 2 O 3 increased from 37.97% and 15.99% to 44.56% and 43.39%, while the lattice oxygen content decreased from 26.53% and 82.46% to 19.08% and 46.49%, respectively. Density functional theory (DFT) calculations revealed that H 2 O molecules can be dissociated on both α-Fe 2 O 3 (1 0 4) and γ-Fe 2 O 3 (2 2 0) surfaces to form H atoms and OH fragments, the H atoms bound with O atoms in Fe-O groups of both α-Fe 2 O 3 (1 0 4) and γ-Fe 2 O 3 (2 2 0) surfaces, and the OH fragments associated with the adjacent iron atoms of α-Fe 2 O 3 (1 0 4) surface or Fe-O groups of γ-Fe 2 O 3 (2 2 0) surface to form Fe-OH. The formation of Fe-OH groups increased the oxidation activity and Hg 0 removal efficiency of Fe 2 O 3 . [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00162361
- Volume :
- 217
- Database :
- Academic Search Index
- Journal :
- Fuel
- Publication Type :
- Academic Journal
- Accession number :
- 128127742
- Full Text :
- https://doi.org/10.1016/j.fuel.2017.12.097