Chemical poison and regeneration of SCR catalysts for NO_x removal from stationary sources

Abstract

Selective catalytic reduction (SCR) of NO_x with NH₃ is an effective technique to remove NO_x 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.

Keywords

flue gas / DeNO_x / SCR catalyst / poison and regeneration

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (Grant Nos. 21325731, 51478241 and 21407088), and National High-Tech Research and the Development (863) Program of China (No. 2013AA065401) and the International Postdoctoral Exchange Fellowship Program of China (No. 20130032).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg