脱硝触媒による水銀の酸化・吸収・脱離機構

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  • Oxidation, Absorption and Desorption Mechanisms of Mercury by the De-NOx Catalyst

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The Minamata Convention on Mercury was adopted in 2013, and regulations on mercury emissions are becoming stricter all over the world. Coal combustion is one of the major mercury emission sources. The majority of mercury emissions from coal combustion is in elemental mercury. This is because elemental mercury is water-insoluble, although oxidized mercury is water-soluble and easily captured by wet scrubbing systems. In this study, we expected the De-NOx catalyst to have a mercury oxidation/capture performance and conducted mercury oxidation/capture experiment using the De-NOx catalyst as a sorbent. In the result, when HCl existed in the atmosphere, the De-NOx catalyst oxidized all of vapor mercury. On the other hand, when HCl existed in the atmosphere, the De-NOx catalyst showed high mercury capture performance. Furthermore, De-NOx catalyst maintained high mercury capture performance at a high temperature (743 K)

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