Ir基催化剂用于CO选择性催化还原NO的研究进展  

Review of the Ir-based catalyst in selective catalytic reduction of NO with CO

作　　者：孟婧轩 高凤雨 唐晓龙 易红宏 周远松 MENG Jingxuan;GAO Fengyu;TANG Xiaolong;YI Honghong;ZHOU Yuansong(School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants,Beijing 100083,China)

机构地区：[1]北京科技大学能源与环境工程学院,北京100083 [2]工业典型污染物资源化处理北京市重点实验室,北京100083

出　　处：《化工进展》2019年第6期2746-2755,共10页Chemical Industry and Engineering Progress

基　　金：国家重点研发计划重点专项(2017YFC0210303);国家自然科学基金面上项目(21677010);国家自然科学基金(U1660109,21806009);中国博士后基金(2018M631344);中央高校基本科研业务费专项资金项目(FRF-TP-18-019A1)

摘　　要：针对具有烟温低、氧含量高和CO浓度大等特征的固定源烟气(钢铁烧结/球团烟气和焦化烟气等)脱硝领域,CO选择性催化还原NOx (CO-SCR)技术具有良好的发展前景。Ir基贵金属催化剂因其在CO-SCR反应体系中表现出了良好的抗氧能力和较高的催化活性成为催化脱硝领域研究的热点之一。本文重点总结了单一载体、复合载体与复合活性组分三类Ir基催化剂在CO-SCR脱除NOx中的催化性能,同时从制备条件和反应条件两大方面归纳了其对Ir基催化剂的CO-SCR脱硝性能的影响,简要阐述了Ir基催化剂表面反应机理,并对未来研究工作进行了展望,指出采用多种手段对催化剂进行改性,并通过降低Ir负载量、反应温度窗口以及提升其催化活性等方式来降低成本,为实现Ir基催化剂CO-SCR工业化应用提供借鉴。The CO selective catalytic reduction of NO_x(CO-SCR) technique has attracted considerable attentions in reduction denitration for flue gas from stationary source such as steel sintering/pellet emissions and coking flue gas, and the most outstanding characteristics of these emissions are low temperature, high oxygen content and high CO concentration. Ir-based catalysts, one class of precious metal catalysts, have become one of the hotspots in catalytic reduction denitration due to their excellent antioxidant capacity and high catalytic activity in the CO-SCR reaction system. This review was devoted to the catalytic performance of three types of Ir-based catalysts in CO-SCR removal of NO_x, including single carrier, composite carrier and composite active component. The effects of the preparation conditions and reaction conditions on the CO-SCR denitration performance of the Ir-based catalysts were also summarized. Finally, the reaction mechanism of NOxon the surface of the Ir-based catalysts was briefly described. The paper points out that the catalyst can be modified by various methods, and the cost can be reduced by reducing the Ir loading and the reaction temperature window or improving the catalytic activity, which provides reference for the industrial application of the Ir-based catalyst CO-SCR.

关 键 词：选择催化还原 一氧化碳 铱 催化剂 

分 类 号：O643.36[理学—物理化学]