Low Temperature deNOx Catalytic Activity with C 2 H 4 as a Reductant Using Mixed Metal Fe-Mn Oxides Supported on Activated Carbon

Fang Liu, Li Yang, Jie Cheng, Xin Wu, Wenbin Quan and Kozo Saito
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Fang Liu: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
Li Yang: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
Jie Cheng: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
Xin Wu: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
Wenbin Quan: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
Kozo Saito: Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40503, USA

Energies, 2019, vol. 12, issue 22, 1-14

Abstract: The selective catalytic reduction of NO x (deNOx) at temperatures less than or at 200 °C was investigated while using C 2 H 4 as the reductant and mixed oxides of Fe and Mn supported on activated carbon; their activity was compared to that of MnOx and FeOx separately supported on activated carbon. The bimetallic oxide compositions maintained high NO conversion of greater than 80–98% for periods that were three times greater than those of the supported monometallic oxides. To examine potential reasons for the significant increases in activity maintenance, and subsequent deactivation, the catalysts were examined by using bulk and surface sensitive analytical techniques before and after catalyst testing. No significant changes in Brunauer-Emmett-Teller (BET) surface areas or porosities were observed between freshly-prepared and tested catalysts whereas segregation of FeOx and MnOx species was readily observed in the mono-oxide catalysts after reaction testing that was not detected in the mixed oxide catalysts. Furthermore, x-ray diffraction and Raman spectroscopy data detected cubic Fe 3 Mn 3 O 8 in both the freshly-prepared and reaction-tested mixed oxide catalysts that were more crystalline after testing. The presence of this compound, which is known to stabilize multivalent Fe species and to enhance oxygen transfer reactions, may be the reason for the high and relatively stable NO conversion activity, and its increased crystallinity during longer-term testing may also decrease surface availability of the active sites responsible for NO conversion. These results point to a potential of further enhancing catalyst stability and activity for low temperature deNOx that is applicable to advanced SCR processing with lower costs and less deleterious side effects to processing equipment.

Keywords: synergistic effects; transition-metal oxides; deactivation; selective catalytic reduction; catalytic activity enhancement (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: 2019
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