Study on the improvement of ultra-low temperature performance and adsorption mechanism of Mn and Ce based denitrification catalysts by “NO2 SCR”

Q3 Energy

燃料化学学报 Pub Date : 2025-01-01 DOI:10.1016/S1872-5813(24)60487-1

Yupeng WANG , Youkang MA , Yonggang ZHAO , Peng CAO

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引用次数: 0

Abstract

The catalysts supported by Mn₇Fe₄Ce₉O_x/AlO_x and Mn₃Fe₁Ce₆O_x/AlO_x prepared by co-precipitation method were first evaluated by standard SCR mechanism reaction under 7777 h^–1 intake condition. The catalytic activity of the two catalysts was only about 10% at 60 °C. Then, the concentration ratio of NO₂/NO_x in intake air was increased under the same conditions, and the concentration ratio of NO₂/NO_x in intake air was 0, 14.3%, 28.6%, 42.8%, 57%, 71.4%, 85.7% and 100%. The results show that the denitrification efficiency of Mn₃Fe₁Ce₆O_x/AlO_x catalyst can be 64% at 60 °C, which is about 58% higher than that of the first evaluation. Experimental and theoretical calculations show that Mn₃Fe₁Ce₆O_x/AlO_x catalyst has larger specific surface area and stronger adsorption and activation of NO₂, which improves the efficiency of NO₂ fast SCR mechanism reaction. At the same time, the in-situ infrared test found that the adsorption mode of Mn₃Fe₁Ce₆O_x/AlO_x catalyst changed significantly when the concentration ratio of NO₂/NO_x increased, and the E-R and L-H mechanism mainly adsorbed by NH₃ changed to the E-R and L-H mechanism mainly adsorbed by NO₂. The change of adsorption mechanism may be the key factor to improve the performance of catalyst at ultra-low temperature. This work provides a promising strategy for exploring efficient and economical denitrification of NH₃-SCR, as well as experience for ultra-low temperature flue gas treatment and guidance for new flue gas treatment processes.

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.