Insight into the mechanisms of activity promotion and SO2 resistance over Fe-doped Ce-W oxide catalyst for NOx reduction

• Published in: Journal of colloid and interface science Vol. 652; no. Pt A; pp. 923 - 935
• Main Authors: Zhang, Hui, Lian, Zhihua, Lin, Chunxi, Zhu, Ying, Shan, Wenpo, He, Hong
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 15.12.2023
• Subjects: active oxygen species; adsorption; ammonium bisulfate; catalysts; Ce-based catalysts; coprecipitation; durability; electron transfer; Low-temperature; oxidation; Selective catalytic reduction; species; sulfates; sulfur; Sulfur resistance; Ce-based catalysts; Selective catalytic reduction; Low-temperature; Sulfur resistance; Fe
• ISSN: 0021-9797; 1095-7103; 1095-7103
• DOI: 10.1016/j.jcis.2023.08.129

[Display omitted] •Fe doping improved the low-temperature activity and SO2 durability of Ce-W oxides.•Doping Fe facilitated the “fast SCR” reaction, thereby improving the SCR activity.•Introducing Fe species could effectively prevent sulfate deposition.•Doping Fe accelerated the decomposition of ammonium bisulfate. Ceria-based catalysts for the selective catalytic reduction of NOx with NH3 (NH3-SCR) are always subject to deactivation by sulfur poisoning. In this study, Fe-doped Ce-W mixed oxides, which were synthesized by the co-precipitation method, improved the SCR activity and SO2 durability at low temperatures of undoped Ce-W oxides. The improved low-temperature activity was mainly due to the enhancement of redox properties at low temperatures and more active oxygen species, together with the adsorption and activation of more abundant NOx species, facilitating the “fast SCR” reaction. In the presence of SO2, doping with Fe species effectively prevented sulfate deposition on the CeW catalyst, due to the interaction between Fe, Ce, and W species inducing electron transfer among different metal sites and altering the electron distribution. The competitive adsorption behavior between NO and SO2 was changed by Fe doping, in which the adsorption and oxidation of SO2 were restrained. Besides, the elevated NO oxidation accelerated the decomposition of ammonium bisulfate, causing the SCR reaction to not be greatly suppressed. Hence, Fe-doped Ce-W oxides catalysts showed excellent sulfur resistance. This study provides an in-depth understanding of efficient Ce-based catalysts for SO2-tolerance strategies.