Issue 24, 2022

Controlling the distribution of aluminum in a Cu–zeolite catalyst by seed-assisted synthesis to improve its NH3-SCR activity

Abstract

Modulating the Al sites in zeolites has been regarded as a promising but difficult strategy for designing high-performance catalysts for various reactions. To this end, a simple seed-assisted strategy was devised in this study to tune the Al distribution in a KFI-type zeolite for improving its activity for the selective catalytic reduction of NOx with NH3 (NH3-SCR). The seed-assisted approach aided in modifying the Al distribution, which increased the proportion of paired Al sites in the KFI zeolite. The resulting distribution of Al sites led to different coordination environments of the Cu ions and enhanced proximity among the Cu ions in the KFI cage due to weaker interactions with the framework. Regulating the cation–framework interactions by altering the Al distribution promoted the redox cycle of the Cu ions in the seed-added Cu-KFI catalysts, which enabled their superior intrinsic NH3-SCR activity compared to that of the Cu-KFI parent catalyst, especially at low temperatures (200–250 °C).

Graphical abstract: Controlling the distribution of aluminum in a Cu–zeolite catalyst by seed-assisted synthesis to improve its NH3-SCR activity

Supplementary files

Article information

Article type
Paper
Submitted
18 Apr 2022
Accepted
05 Nov 2022
First published
08 Nov 2022

Catal. Sci. Technol., 2022,12, 7470-7480

Controlling the distribution of aluminum in a Cu–zeolite catalyst by seed-assisted synthesis to improve its NH3-SCR activity

H. Lee, J. Kim, I. Song, S. W. Jeon, S. J. Cho and D. H. Kim, Catal. Sci. Technol., 2022, 12, 7470 DOI: 10.1039/D2CY00745B

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