Performance of C 2 H 4 Reductant in Activated-Carbon- Supported MnOx-based SCR Catalyst at Low Temperatures

Guangli Liu, Dongtai Han, Jie Cheng, Yongshi Feng, Wenbin Quan, Li Yang and Kozo Saito
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Guangli Liu: Lanzhou Petrochemical Research Center, PetroChina, Lanzhou 730060, Gansu, China
Dongtai Han: 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
Yongshi Feng: 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
Li Yang: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
Kozo Saito: Department of Mechanical Engineering, College of Engineering, University of Kentucky, Lexington, KY 40506, USA

Energies, 2018, vol. 12, issue 1, 1-15

Abstract: Hydrocarbons as reductants show promising results for replacing NH 3 in SCR technology. Therefore, considerable interest exists for developing low-temperature (<200 °C) and environmentally friendly HC-SCR catalysts. Hence, C 2 H 4 was examined as a reductant using activated-carbon-supported MnOx-based catalyst in low-temperature SCR operation. Its sensitivity to Mn concentration and operating temperature was parametrically studied, the results of which showed that the catalyst activity followed the order of 130 °C > 150 °C > 180 °C with an optimized Mn concentration near 3.0 wt.%. However, rapid deactivation of catalytic activity also occurred when using C 2 H 4 as the reductant. The mechanism of deactivation was explored and is discussed herein in which deactivation is attributed to two factors. The manganese oxide was reduced to Mn 3 O 4 during reaction testing, which contained relatively low activity compared to Mn 2 O 3 . Also, increased crystallinity of the reduced manganese and the formation of carbon black occurred during SCR reaction testing, and these constituents on the catalyst’s surface blocked pores and active sites from participating in catalytic activity.

Keywords: NOx reduction; selective catalytic reduction; manganese oxides; activated carbon; deactivation mechanism (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: 2018
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