期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 51, 期 15, 页码 8530-8536出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.7b00224
关键词
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资金
- National Natural Science Foundation of China [51476189]
- Environmental Research Funds of Hunan Province
- Research Grants Council of Hong Kong [17257616, C7044-14G, T21-771/16R]
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.
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