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J Environ Sci (China) ; 30: 55-64, 2015 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-25872709

RESUMO

A novel ferruginous active absorbent, prepared by fly ash, industrial lime and the additive Fe(VI), was introduced for synchronous abatement of binary mixtures of SO2-NOx from simulated coal-fired flue gas. The synergistic action of various factors on the absorption of SO2 and NOx was investigated. The results show that a strong synergistic effect exists between Fe(VI) dose and reaction temperature for the desulfurization. It was observed that in the denitration process, the synergy of Fe(VI) dose and Ca/(S+N) had the most significant impact on the removal of NO, followed by the synergy of Fe(VI) and reaction temperature, and then the synergy of reaction temperature and flue gas humidity. A scanning electron microscope (SEM) and an accessory X-ray energy spectrometer (EDS) were used to observe the surface characteristics of the raw and spent absorbent as well as fly ash. A reaction mechanism was proposed based on chemical analysis of sulfur and nitrogen species concentrations in the spent absorbent. The Gibbs free energy, equilibrium constants and partial pressures of the SO2-NOx binary system were determined by thermodynamics.


Assuntos
Poluentes Atmosféricos/química , Poluição do Ar/prevenção & controle , Compostos de Ferro/química , Óxidos de Nitrogênio/química , Dióxido de Enxofre/química , Absorção Fisico-Química , Adsorção , Gases , Microscopia Eletrônica de Varredura , Espectrometria por Raios X , Difração de Raios X
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