Performance of Mn-Ce-Fe/FA Catalysts on Selective Catalytic Reduction of NO X with CO under Different Atmospheres

Zheng Xia, Ruiping Zhang, Jixin Duan, Yanxing Liu, Zhengyuan Li and Xiang Gou ()
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Zheng Xia: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
Ruiping Zhang: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
Jixin Duan: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
Yanxing Liu: Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK
Zhengyuan Li: Department of Chemistry, University College London, Gower Street, London WC1E 6BT, UK
Xiang Gou: School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China

Energies, 2023, vol. 16, issue 9, 1-23

Abstract: Gas turbines produce a large amount of NO x and CO due to high temperatures and insufficient combustion. Through the selective catalytic reduction of NO with CO (CO-SCR) in a gas turbine, the activities of the Mn-Fe-Ce/FA catalyst using fly ash (FA) as a carrier under different atmospheres were studied. The catalysts prepared by calcining different active materials under different atmospheres were used to analyze their denitrification abilities and resistance to water vapor. The denitrification performance of the catalyst prepared under reducing atmosphere is about 30 percent higher than that of the catalyst prepared under air atmosphere, and the decarburization performance is about 40 percent higher. In the presence of oxygen, the denitrification rate and decarburization rate of the 1:1 ratio of the Mn-Ce catalyst reach 67.16% and 59.57%, respectively. In an oxygen-containing atmosphere, the catalyst prepared by replacing Ce with Fe shows better denitrification and decarburization performances, which are 78.56% and 78.39%, respectively. When the flue gas space velocity is 4000 h −1 and the carbon-nitrogen ratio is 1.6, the catalyst shows better performance. After the water vapor is introduced, the denitrification and decarbonization rates of the catalyst decrease by about 10% and 9%, respectively. After ceasing water vapor, it rebounds by about 8%, and the activity could not be fully restored. However, the catalyst still shows strong water resistance in general.

Keywords: CO-SCR; nitrogen oxides; fly ash; catalyst (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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