Issue 2, 2017

Design strategies for SCR catalysts with improved N2 selectivity: the significance of nano-confining effects by titanate nanotubes

Abstract

Copper has been investigated as a promising alternative for SCR reactions. However, most Cu-based catalysts supported on zeolites, alumina or titania produced a certain amount of undesired N2O by-product. Herein, we report a strategy to tune the redox properties of copper oxides via confinement within titanate nanotubes (Cu/TNTs) and investigate their SCR activity as well as the N2 selectivity. The Cu/TNT catalyst showed an excellent NO reduction performance (above 90%) in the temperature window of 300–450 °C and the N2 selectivity could exceed 98% among the whole reaction temperature range of 150–470 °C, with a negligibly low concentration of N2O being detected. After systematic characterizations, the tuning of the chemical state of copper and oxygen, the remarkable adsorption capability, the accelerated oxidation of Cu+ to Cu2+, the lower level of NH3 oxidation and ultimately the tuning of redox properties were discovered. This work could provide a new approach to design SCR catalysts with superior catalytic reduction performance as well as excellent N2 selectivity.

Graphical abstract: Design strategies for SCR catalysts with improved N2 selectivity: the significance of nano-confining effects by titanate nanotubes

Article information

Article type
Paper
Submitted
01 Dec 2016
Accepted
07 Dec 2016
First published
07 Dec 2016

Environ. Sci.: Nano, 2017,4, 437-447

Design strategies for SCR catalysts with improved N2 selectivity: the significance of nano-confining effects by titanate nanotubes

X. Chen, P. Wang, P. Fang, H. Wang, C. Cen, W. Zeng and Z. Wu, Environ. Sci.: Nano, 2017, 4, 437 DOI: 10.1039/C6EN00627B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements