A MnOx@Eu-CeOx nanorod catalyst with multiple protective effects: Strong SO2-tolerance for low temperature DeNOx processes

Chenglong Yu; Dan Hou; Bichun Huang; Meijuan Lu; Ruosi Peng; Zhiyong Zhong

doi:10.1016/j.jhazmat.2020.123011

A MnO_x@Eu-CeO_x nanorod catalyst with multiple protective effects: Strong SO₂-tolerance for low temperature DeNO_x processes

J Hazard Mater. 2020 Nov 15:399:123011. doi: 10.1016/j.jhazmat.2020.123011. Epub 2020 May 29.

Authors

Chenglong Yu¹, Dan Hou², Bichun Huang³, Meijuan Lu⁴, Ruosi Peng⁵, Zhiyong Zhong⁴

Affiliations

¹ School of Land Resources and Environment, Key Laboratory of Agricultural Resource and Ecology in the Poyang Lake Basin of Jiangxi Province, Jiangxi Agricultural University, Nanchang 330045, China. Electronic address: chenglongyu888@163.com.
² Key Laboratory of Chemical Utilization of Plant Resources of Nanchang, College of Science, Jiangxi Agricultural University, Nanchang 330045, China.
³ School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China.
⁴ School of Land Resources and Environment, Key Laboratory of Agricultural Resource and Ecology in the Poyang Lake Basin of Jiangxi Province, Jiangxi Agricultural University, Nanchang 330045, China.
⁵ School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China.

PMID: 32535516
DOI: 10.1016/j.jhazmat.2020.123011

Abstract

A novel MnO_x@Eu-CeO_x catalyst with multiple protective attributes was designed and fabricated using a chemical precipitation method and tested for its low temperature SCR activity. The subject MnO_x@Eu-CeO_x nanorod catalyst exhibited superior SCR performance and strong SO₂-tolerance. The formation of the composite-shell structure enhanced the catalysts' surface acidity and redox performance, which resulted in excellent SCR performance. Moreover, the TG results suggested that the protective effect of the EuO_x-CeO_x composite-shell effectively reduced the deposition of the surface sulphates. The XPS, XRD analysis results of the subject catalyst together with theoretical calculations provided strong evidence that there was a strong interaction between Mn and Ce in the MnO_x@Eu-CeO_x. This significant interaction could provide maximum protection to the core from the effect of SO₂, which also contributed to the high SO₂ resistance of the catalyst. In situ FT-IR results also indicated that the chemisorbed species on MnO_x@Eu-CeO_x were much more stable in the presence of SO₂ compared to Eu-CeO_x/MnO_x, which resulted in the deposition of significantly less sulphates. This low temperature SCR catalyst with multiple protective attributes, including composite shell, strong interaction and core-shell structure, is the key to long-term resistance to SO₂.

Keywords: Composite-shell; DeNO(x) catalyst; Low temperature SCR; SO(2) resistance.