NO Reduction By Propane Over Monolithic Cordierite-based Fe/Al2O3 Catalyst: Reaction Mechanism And Effect Of H2O/SO2

Author

Hao Zhou
Yaxin Su
Wenyu Liao, Missouri University of Science and TechnologyFollow
Wenyi Deng
Fangchuan Zhong

Abstract

The selective reduction of NO by C₃H₈and the sensitivity to H₂O and SO₂have been studied over monolithic cordierite-based Fe/Al₂O₃catalysts, which were prepared by the sol–gel and impregnation method. The catalysts were investigated by N₂ adsorption, X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) techniques. Results showed that NO reduction was more than 90% in the absence of oxygen at 500 °C and in the presence of oxygen at 600 °C respectively. In a continues test of 12 h at 600 °C, 0.02% of SO₂caused an irrecoverable decrease of NO conversion from 94% to 85% and 2.5% of H₂O caused a drop of NO conversion from 86% to 56%, while NO conversion totally recovered when H₂O was removed. The catalysts lost 15% of the initial activity after a hydrothermal treatment due to the agglomeration of iron oxide nanorods. Sulphidation treatment caused about a loss of 30% of the initial activity because of the deposited SO₄²⁻species. In situ study by DRIFTS indicated that coexisting H₂O influenced the formation NO₂ ad species and unidentate nitrate, while SO₂ slightly inhibited the formation of NO₂/NO₃⁻species but promoted the formation of acetate/formate species during NO reduction by C₃H₈. Based on the results, a preliminary mechanism was proposed and discussed. The results may help understand the fundamental performance of monolithic cordierite-based Fe/Al₂O₃catalysts and provide some reference for SCR-HC catalyst design.

Recommended Citation

H. Zhou et al., "NO Reduction By Propane Over Monolithic Cordierite-based Fe/Al2O3 Catalyst: Reaction Mechanism And Effect Of H2O/SO2," Fuel, vol. 182, pp. 352 - 360, Elsevier, Jan 2016.

The definitive version is available at https://doi.org/10.1016/j.fuel.2016.05.116

Department(s)

Civil, Architectural and Environmental Engineering

Comments

National Natural Science Foundation of China, Grant CJ20140008

Keywords and Phrases

C H 3 8; Fe/Al O 2 3; H O 2; SCR of NO; SO 2

International Standard Serial Number (ISSN)

0016-2361

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Elsevier, All rights reserved.

Publication Date

01 Jan 2016