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Catalytic NO Reduction by CO over Ca–Fe Oxides in the Presence of O2 with Sintering Flue Gas Circulation
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2020-10-25 , DOI: 10.1021/acs.iecr.0c03843
Chaoqun Li 1, 2 , Qingzhen Han 1 , Tingyu Zhu 1, 3 , Wenqing Xu 1, 3
Affiliation  

Flue gas circulation is an important method to reduce NOx emission in the iron ore sintering process. In flue gas circulation, NOx is eliminated mainly through the reduction reaction with C or CO, in which CaFe2O4 plays an important role as the catalyst. In this paper, CaFe2O4 was synthesized by the ceramic route, and the catalytic performance was investigated. The experimental results show that the reduced calcium ferrite (RCF) was superior to unreduced samples in catalytic activity and oxygen tolerance. The results of density functional theory (DFT) calculation and characterization showed that the RCF was in an electron-deficient state, which led to its higher catalytic activity. The electron-deficient state is more conducive to the complexation between the sample and oxygen under an oxygen-containing atmosphere, improving the O2 tolerance in the CO–NO reaction. The results suggest that decreasing the O2 content in the circulating flue gas will enhance the reducing atmosphere in the sintering bed and facilitate the catalytic reaction between CO and NO, which is beneficial for NOx removal.

中文翻译:

烧结烟气循环下O 2存在下Ca-Fe氧化物上CO催化的NO还原

烟气循环是减少铁矿石烧结过程中NOx排放的重要方法。在烟气循环中,主要通过与C或CO的还原反应消除NOx,其中CaFe 2 O 4作为催化剂起着重要的作用。在本文中,CaFe 2 O 4通过陶瓷路线合成了其,并研究了其催化性能。实验结果表明,还原的铁酸钙(RCF)在催化活性和耐氧性方面优于未还原的样品。密度泛函理论(DFT)的计算和表征结果表明,RCF处于电子缺陷状态,从而使其催化活性更高。缺电子状态更有利于样品和氧气在含氧气氛下的络合,从而提高了CO-NO反应中的O 2耐受性。结果表明降低O 2 循环烟道气中的氮含量将增强烧结床中的还原气氛,并促进CO和NO之间的催化反应,这对于NOx的去除是有利的。
更新日期:2020-11-25
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