摘要
在实现碳中和目标的关键时期,燃煤电厂经常面临低负荷运行带来的烟气中CO污染问题,这对CO与NO_(x)协同脱除技术提出了新的挑战。以低温浸渍法制备的Fe/ZSM-5(x)系列催化剂为研究对象,通过改变催化剂中的硅铝比(Si/Al质量比),研究其对CO选择性催化还原(CO-SCR)活性的影响。所制备的催化剂Fe/ZSM-5(x)(x=25、46、70、81)经过X射线衍射(XRD)、比表面积和孔径分析(BET)、H_(2)温度程序还原(H_(2)-TPR)、NO温度程序脱附(NO-TPD)和NH3温度程序脱附(NH3-TPD)等多种表征手段的分析。研究结果揭示了Fe/ZSM-5(70)因较大的比表面积、出色的氧化还原性能及NO优异吸脱附特性,600℃时NO转化率达76.6%,具有优异的CO-SCR脱硝性能。研究结果对于理解硅铝比对Fe/ZSM-5系列催化剂活性的影响具有重要意义,为提高燃煤电厂在低负荷条件下的污染物脱除效率提供科学依据。
In the context of achieving carbon neutrality,coal-fired power plants are increasingly confronted with the challenge of CO pollution during low-load operations,posing newtechnical challenges for the synergistic removal of CO and NO_(x).This study focused on the preparation of Fe/ZSM-5(x)catalysts(x=25,46,70,81)via a low-temperature impregnation method and investigated the effect of the Si/Al ratio on the CO selective catalytic reduction(CO-SCR)activity of these catalysts.Characterization techniques including X-ray diffraction(XRD),Brunauer-Emmett-Teller(BET)surface area analysis,H_(2) temperature-programmed reduction(H_(2)-TPR),NO temperatureprogrammed desorption(NO-TPD),and NH3 temperature-programmed desorption(NH3-TPD)were utilized to evaluate the catalysts’properties.The results show that the Fe/ZSM-5(70)catalyst,with a higher Si/Al ratio,exhibited a larger surface area,superior redox capabilities,and better NO adsorption-desorption properties.This leads to a high conversion rate of NO at 76.6%at 600℃,indicating its enhanced CO-SCR de NO_(x) performance.These findings significantly contribute to understanding the impact of the Si/Al ratio on the activity of the Fe/ZSM-5 series catalysts and offer a scientific basis for improving the efficiency of pollutant removal under low-load conditions in coal-fired power plants.
作者
姚卫强
刘子林
刘晓刚
步晓波
马少丹
金卫
杨兴隆
王剑雄
刘文韬
林德海
王虹
Weiqiang;LIU Zilin;LIU Xiaogang;BU Xiaobo;MA Shaodan;JIN Wei;YANG Xinglong;WANG Jianxiong;LIU Wentao;LIN Dehai;WANG Hong(China Energy Dawukou Thermal Power Co.,Ltd.,Shizuishan 753000,China;National Institute of Clean-and-Low-Carbon Energy,Beijing 102211,China;Beijing Institute of Petrochemical Technology,Beijing 102627,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2024年第S01期204-209,共6页
Clean Coal Technology
作者简介
姚卫强(1986—),男,安徽运城人,副高级工程师。E-mail:yaoweiqiang006@163.com
