Mercury Oxidation over the V2O5(WO3)/TiO2 Commercial SCR Catalyst

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• 作者：Hiroyuki Kamata ; Shun-ichiro Ueno ; Toshiyuki Naito ; Akinori Yukimura
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2008
• 出版时间：November 5, 2008
• 年：2008
• 卷：47
• 期：21
• 页码：8136-8141
• 全文大小：241K
• 年卷期：v.47,no.21(November 5, 2008)
• ISSN：1520-5045

文摘

Mercury oxidation by hydrochloric acid over the V₂O₅(WO₃)/TiO₂ commercial SCR catalyst was investigated. Both fresh and aged catalysts with honeycomb structure, which were exposed to a coal combustion flue gas in a coal-fired boiler for over 71 000 h, were examined. The aged catalysts were characterized by X-ray and SEM-EDX analysis to examine the presence of ash deposition on the surface. The mercury oxidation rate was enhanced by increasing HCl concentrations and inhibited strongly by the presence of NH₃. This behavior could be explained by a kinetic model assuming that HCl competes for the catalyst active sites against NH₃. As the catalyst operation time increased, the mercury oxidation rate was observed to decrease considerably in the presence of NH₃ while NO reduction rate was apparently nearly unchanged. By examining aged catalysts, deposits stemming from fly ash and SO₂/SO₃ were observed to accumulate continuously on the catalyst surface. The ash deposited on the surface may partially block the active catalyst sites and decrease their number. The decrease of the number of active sites on the catalyst surface caused NH₃ to remain unreacted in the honeycomb catalyst. The decrease of the Hg⁰ oxidation rate was caused by the inhibition effect of NH₃ remaining in the catalyst.