Chemical poison and regeneration of SCR catalysts for NOx removal from stationary sources |
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| Authors: | Junhua LI Yue PENG Huazhen CHANG Xiang LI John C CRITTENDEN Jiming HAO |
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| Institution: | 1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China2. School of Civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems, Georgia Institute of Technology, 800 West Peachtree Street, Suite 400 F-H, Atlanta, GA 30332-0595, United States3. School of Environment and Natural Resource, Renmin University of China, Beijing 100872, China |
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| Abstract: | Selective catalytic reduction (SCR) of NOx with NH3 is an effective technique to remove NOx from stationary sources, such as coal-fired power plant and industrial boilers. Some of elements in the fly ash deactivate the catalyst due to strong chemisorptions on the active sites. The poisons may act by simply blocking active sites or alter the adsorption behaviors of reactants and products by an electronic interaction. This review is mainly focused on the chemical poisoning on V2O5-based catalysts, environmental-benign catalysts and low temperature catalysts. Several common poisons including alkali/alkaline earth metals, SO2 and heavy metals etc. are referred and their poisoning mechanisms on catalysts are discussed. The regeneration methods of poisoned catalysts and the development of poison-resistance catalysts are also compared and analyzed. Finally, future research directions in developing poisoning resistance catalysts and facile efficient regeneration methods for SCR catalysts are proposed. |
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| Keywords: | flue gas DeNOx SCR catalyst poison and regeneration |
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