Mn/Fe synergy enables wide-temperature NH3-SCR activity over MnFeCe/SSZ-13: insights into the structure–activity relationship
4 affiliations
- 1Faculty of Materials Science and Engineering, Kunming University of Science and Technology Kunming 650093 PR China
- 2Kunming Sino-Platinum Metals Catalyst Co., Ltd. Kunming 650106 PR China
- 3Digital Industry Research Institute, Zhejiang Wanli University Ningbo 315100 PR China
- 4Research Center for Analysis and Measurement, Kunming University of Science and Technology Kunming 650093 PR China
Abstract
The selective catalytic reduction of NOx with ammonia (NH3-SCR) is a key technology for abating NOx emissions. Single-metal-loaded zeolite catalysts typically exhibit inferior low-temperature activity and a narrow effective temperature window, and the unclear synergistic mechanisms among multiple metal components further hinder their practical application. Herein, we synthesized a series of MnFeCe/SSZ-13 catalysts with varying Mn/Fe mass ratios using a wet chemical ion-exchange method to enhance low-temperature activity and expand the active temperature range. The optimal Mn(6 wt%)Fe(2 wt%)Ce-13 catalyst achieved >90% NO conversion over a temperature range of 185–475 °C, representing a 160 °C shift toward lower temperatures compared with the Fe(8 wt%)Ce-13. Systematic characterization revealed that a suitable Mn/Fe ratio facilitated the formation of abundant surface Mn4+/Fe2+ species and a high content of surface-adsorbed oxygen. In this synergistic system, Mn4+ promotes NO oxidation to NO2, contributing to the fast SCR pathway; Fe2+ inhibits NH3 over-oxidation at high temperatures; and Ce4+ may acts as an oxygen buffer to stabilize the catalytic cycle. In situ DRIFTS further provided evidence for the coexistence of Langmuir–Hinshelwood (L–H) and Eley–Rideal (E–R) mechanisms along with fast selective catalytic reduction (fast SCR) reaction. This work unravels the Mn–Fe synergistic mechanism that addresses the issues of insufficient low-temperature activity and restricted temperature range, offering experimental validation and mechanistic guidance for developing high-performance NH3-SCR catalysts with extended temperature applicability.
Related
- Carltonine B derivatives: Synthesis and structure-activity relationship insights for selective butyrylcholinesterase inhibition
- Structure-activity relationship of Cu(II) and Pd(II) thiosemicarbazone complexes with anticancer and antibacterial properties
- Rationally Designed Phenyl- and Phenanthryl-Based Imidazole Hybrids for the Treatment of Breast Cancer—A Structure–Activity Relationship Study
- Design and synthesis of novel benzimidazole-based hydrazones as potential gastroprotective agents: Antioxidant, histopathological, and structure–activity relationship studies in an ethanol-induced gastric ulcer rat model
- From Promotion to Poisoning: Temperature- and Coverage-Dependent Effects of Trace Fe on the Hydrogen Evolution Activity of Pt
BibTeX
@article{xu2026mnfe,
title = {{Mn/Fe synergy enables wide-temperature NH3-SCR activity over MnFeCe/SSZ-13: insights into the structure–activity relationship}},
author = {ChenXiao Xu and Yin Liang and Hongyuan Song and Chen Zhang and Haorong Wu and Daiwei Zhang and Jianlin Dong and Kun Dong and Lan Yu},
journal = {RSC Advances},
year = {2026},
month = oct,
doi = {10.1039/d6ra07769b},
url = {https://doi.org/10.1039/d6ra07769b},
note = {CC BY-NC 3.0},
}
RIS
TY - JOUR
TI - Mn/Fe synergy enables wide-temperature NH3-SCR activity over MnFeCe/SSZ-13: insights into the structure–activity relationship
AU - ChenXiao Xu
AU - Yin Liang
AU - Hongyuan Song
AU - Chen Zhang
AU - Haorong Wu
AU - Daiwei Zhang
AU - Jianlin Dong
AU - Kun Dong
AU - Lan Yu
PY - 2026
DA - 2026/10/08
JO - RSC Advances
DO - 10.1039/d6ra07769b
UR - https://doi.org/10.1039/d6ra07769b
AB - The selective catalytic reduction of NOx with ammonia (NH3-SCR) is a key technology for abating NOx emissions. Single-metal-loaded zeolite catalysts typically exhibit inferior low-temperature activity and a narrow effective temperature window, and the unclear synergistic mechanisms among multiple metal components further hinder their practical application. Herein, we synthesized a series of MnFeCe/SSZ-13 catalysts with varying Mn/Fe mass ratios using a wet chemical ion-exchange method to enhance low-temperature activity and expand the active temperature range. The optimal Mn(6 wt%)Fe(2 wt%)Ce-13 catalyst achieved >90% NO conversion over a temperature range of 185–475 °C, representing a 160 °C shift toward lower temperatures compared with the Fe(8 wt%)Ce-13. Systematic characterization revealed that a suitable Mn/Fe ratio facilitated the formation of abundant surface Mn4+/Fe2+ species and a high content of surface-adsorbed oxygen. In this synergistic system, Mn4+ promotes NO oxidation to NO2, contributing to the fast SCR pathway; Fe2+ inhibits NH3 over-oxidation at high temperatures; and Ce4+ may acts as an oxygen buffer to stabilize the catalytic cycle. In situ DRIFTS further provided evidence for the coexistence of Langmuir–Hinshelwood (L–H) and Eley–Rideal (E–R) mechanisms along with fast selective catalytic reduction (fast SCR) reaction. This work unravels the Mn–Fe synergistic mechanism that addresses the issues of insufficient low-temperature activity and restricted temperature range, offering experimental validation and mechanistic guidance for developing high-performance NH3-SCR catalysts with extended temperature applicability.
SN - 2046-2069
ER -