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Title: Effect of nitrogen oxides on elemental mercury removal by nanosized mineral sulfide
Authors: Li, HL
Zhu, L
Wang, J
Li, LQ
Lee, PH 
Feng, Y
Shih, KM
Issue Date: 2017
Publisher: American Chemical Society
Source: Environmental science & technology, 2017, v. 51, no. 15, p. 8530-8536 How to cite?
Journal: Environmental science & technology 
Abstract: Because of its large surface area, nanosized zinc sulfide (Nano-ZnS) has been demonstrated in a previous study to be efficient for removal of elemental mercury (Hg-0) from coal combustion flue gas. The excellent mercury adsorption performance of Nano-ZnS was found to be insusceptible to water vapor, sulfur dioxide, and hydrogen chloride. However, nitrogen oxides (NOx) apparently inhibited mercury removal by Nano-ZnS; this finding was unlike those of many studies on the promotional effect of NOx on Hg-0 removal by other sorbents. The negative effect of NOx on Hg adsorption over Nano-ZnS was systematically investigated in this study. Two mechanisms were identified as primarily responsible for the inhibitive effect of NOx on Hg adsorption over Nano-ZnS: (1) active sulfur sites on Nano-ZnS were oxidized to inactive sulfate by NOx; and (2) the chemisorbed mercury, i.e., HgS, was reduced to Hg by NOx. This new insight into the role of NOx in Hg adsorption over Nano-ZnS can help to optimize operating conditions, maximize Hg adsorption, and facilitate the application of Nano-ZnS as a superior alternative to activated carbon for Hg removal using existing particulate matter control devices in power plants.
ISSN: 0013-936X
EISSN: 1520-5851
DOI: 10.1021/acs.est.7b00224
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