Issue 1, 2016

Nitrogen oxide removal over hydrotalcite-derived mixed metal oxides

Abstract

Rigorous regulations of nitrogen oxide emissions require the development of technologies for their removal from exhaust gases. Implementation of appropriate catalysts can potentially promote NOx (NO, NO2) or N2O removal in shorter reaction time and under milder operation conditions. However, several challenges have to be faced upon trying to address nitrogen oxide pollution with catalytic systems such as sufficient catalytic performance, suitable operational temperatures and catalyst poisoning. The flexible structure of hydrotalcite-like compounds offers the opportunity to introduce various metals into the materials to provide active and selective catalysts for NOx and N2O removal. This minireview summarizes the abatement of nitrogen oxides by using hydrotalcite-derived mixed metal oxides. At first, a brief overview on the general features of hydrotalcite-originated mixed metal oxides and their applications in catalysis is provided. Later on, the application of mixed metal oxides as SCR catalysts with both ammonia (NH3-SCR) and hydrocarbons (HC-SCR) as reducing agents is discussed. An overview of the mixed metal oxides applied as catalysts for NOx storage/reduction (NSR) and further in the simultaneous removal of NOx and soot particles is provided. Additionally, this review discusses mixed metal oxides as efficient catalysts for catalytic decomposition (deN2O) and selective catalytic reduction of N2O (N2O-SCR). Finally, the remaining challenges and future trends are highlighted.

Graphical abstract: Nitrogen oxide removal over hydrotalcite-derived mixed metal oxides

Article information

Article type
Minireview
Submitted
05 May 2015
Accepted
19 Jul 2015
First published
07 Aug 2015
This article is Open Access
Creative Commons BY-NC license

Catal. Sci. Technol., 2016,6, 49-72

Nitrogen oxide removal over hydrotalcite-derived mixed metal oxides

M. Jabłońska and R. Palkovits, Catal. Sci. Technol., 2016, 6, 49 DOI: 10.1039/C5CY00646E

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, 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 commercial 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