Issue 31, 2017, Issue in Progress

Modulating Cu+ distribution on the surface of Ce-doped CuO composite oxides for SO2-resistant NH3-selective catalytic reduction of NO

Abstract

A series of (CeOx)mCuO composite oxides with different Ce/Cu molar ratios (m) were prepared by co-precipitation for ammonia-selective catalytic reduction of NO (NH3-SCR-NO) in the absence and presence of SO2. Through X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2-temperature programmed reduction (H2-TPR), and NH3-temperature programmed desorption (NH3-TPD) characterization, it was demonstrated that the prepared samples were featured by distinguished Cu+ distributions on the surface of the Ce-doped CuO composite structure, indicating a special interaction or synergistic effect present in the samples. The modulated distributions of Cu+ achieved by adjusting the Ce/Cu molar ratio were found to be crucial for optimizing the redox ability and acid feature among the samples. The outstanding SO2-resistant NH3-SCR-NO performance (NO conversion close to 100% in temperature window of 250–350 °C under 200 ppm SO2-presence) was observed on (CeOx)0.25CuO which possessing the highest Cu+ distribution, indicating the significant dependence of Cu+ distribution in Cu-based catalysts on enhancing catalytic performance for NH3-SCR-NO. These results also suggested that the distinguished synergistic effect among binary component Cu-based catalysts should be considered as an important factor to govern the performance of NH3-SCR-NOx, which could be inferred as important clues to innovate more efficient catalysts for NH3-SCR-NOx, as well as other heterogeneous catalysis applications based on Cu-catalysts.

Graphical abstract: Modulating Cu+ distribution on the surface of Ce-doped CuO composite oxides for SO2-resistant NH3-selective catalytic reduction of NO

Article information

Article type
Paper
Submitted
14 Jan 2017
Accepted
14 Mar 2017
First published
28 Mar 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 18830-18837

Modulating Cu+ distribution on the surface of Ce-doped CuO composite oxides for SO2-resistant NH3-selective catalytic reduction of NO

M. Xing, Q. Sun, C. Zeng, H. Wang, D. Zhao, N. Zhang and S. Hong, RSC Adv., 2017, 7, 18830 DOI: 10.1039/C7RA00581D

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements