Issue 9, 2024

Copper-exchanged SUZ-4 zeolite catalysts for selective catalytic reduction of NOx

Abstract

Copper-based SSZ-13 (Cu-SSZ-13, CHA topology) zeolite catalysts have been commercialized towards the selective catalytic reduction of NOx with NH3 (NH3-SCR), but the applications of Cu-SSZ-13 catalysts are still limited by the great challenge of high-cost organic templates. To this end, zeolite catalysts with other topologies have been attempted to substitute SSZ-13 to achieve the target of low cost and high performance. Herein, a series of SUZ-4 zeolites (SZR topology), structurally related to the FER topology, are successfully synthesized by using tetraethylammonium hydroxide (TEAOH) as the organic template. Compared to SSZ-13 zeolites synthesized by the addition of N,N,N-trimethyl-1-adamantylammonium hydroxide (TMAdaOH), the obtained SUZ-4 zeolites show higher economic benefits. Moreover, copper-exchanged SUZ-4 (Cu-SUZ-4) zeolites exhibit comparable NH3-SCR performance to commercial Cu-SSZ-13. Particularly, the NO conversion of the Cu-SUZ-4-2 zeolite with optimal Cu loading is above 90% in the temperature range of 250–550 °C at high gaseous hourly space velocity (200 000 h−1). After hydrothermal ageing (HTA), the NO conversion of Cu-SUZ-4-2-HTA is close to 90% in the temperature range of 300–550 °C, indicating its high hydrothermal stability. The present work provides an alternative catalyst that can potentially substitute SSZ-13 with high NH3-SCR catalytic properties and low cost.

Graphical abstract: Copper-exchanged SUZ-4 zeolite catalysts for selective catalytic reduction of NOx

Supplementary files

Article information

Article type
Research Article
Submitted
20 Jul 2023
Accepted
06 Sep 2023
First published
08 Sep 2023

Mater. Chem. Front., 2024,8, 2142-2148

Copper-exchanged SUZ-4 zeolite catalysts for selective catalytic reduction of NOx

Y. Bai, D. Hao, Y. Wei, J. Han, D. Li, M. Chen and J. Yu, Mater. Chem. Front., 2024, 8, 2142 DOI: 10.1039/D3QM00813D

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