The co-benefit of elemental mercury oxidation and slip ammonia abatement with SCR-Plus catalysts
The co-benefit of elemental mercury oxidation and slip ammonia abatement with SCR-Plus catalysts
复制标题
使用 SCR-Plus 催化剂实现元素汞氧化和逃逸氨减排的协同效益
DOI：
10.1016/j.fuel.2014.04.086
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发表时间：
2014-10-01
期刊：
影响因子：
7.4
通讯作者：
Jia, Jinping
中科院分区：
文献类型：
--
作者：
Chen, Wanmiao;Ma, Yongpeng;Jia, Jinping
为了提高单质汞（Hg-0）在选择性催化还原（NH3-SCR）单元间氧化的协同效益，并最大限度地减少烟气中的溜氨（未反应还原剂），提出了SCR-Plus的概念，并对催化剂进行了研究。采用钼（Mo）和钌（Ru）对常规SCR催化剂进行改性，在较高的空速下制备了SCR- plus催化剂。结果表明，Mo掺杂Ru/SCR催化剂可以显著降低Ru的需求含量，对Hg-0氧化表现出优异的催化活性，对SO2和氨的抑制能力更强。同时，Mo和Ru在SCR催化剂中的协同作用有利于减少滑脱氨。当模拟烟气中加入约5 ppm的HCl时，Mo/Ru-SCR催化剂的Hg-0去除率大于99%。同时，通过Deacon反应评价和原位漫反射红外傅里叶变换（DRIFT）技术对可能的反应机理进行了研究。(C) 2014 Elsevier Ltd.版权所有。
To enhance the co-benefits of elemental mercury (Hg-0) oxidation across the selective catalytic reduction (NH3-SCR) units and to minimize slip ammonia (unreacted reductant) from flue gases, the conception of SCR-Plus was put forwarded and the catalysts were investigated. The SCR-Plus catalysts were prepared by modifying the conventional SCR catalyst with molybdenum (Mo) and ruthenium (Ru) to meet such purposes at relatively high space velocity. It was found the doping of Mo to Ru/SCR catalyst could significantly reduce the demand content of Ru, and the catalyst exhibited outstanding catalytic activity for Hg-0 oxidation and more tolerant to the inhibition of SO2 and ammonia, respectively. Meanwhile, the cooperation of Mo and Ru in the SCR catalyst facilitated the abatement of slip ammonia. The Hg-0 removal efficiency of the Mo/Ru-SCR catalyst was greater than 99% when approximately 5 ppm of HCl was added to the simulated flue gas. Meanwhile, Deacon reaction evaluation and in situ diffuse reflectance infrared Fourier transform (DRIFT) technique were performed for the possible reaction mechanisms. (C) 2014 Elsevier Ltd. All rights reserved.