1. Poisoning mechanism of KCl, K2O and SO2 on Mn-Ce/CuX catalyst for low-temperature SCR of NO with NH3.
- Author
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Chen, Lin, Ren, Shan, Xing, Xiangdong, Yang, Jie, Li, Xiaodi, Wang, Mingming, Chen, Zhichao, and Liu, Qingcai
- Subjects
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COEXISTENCE of species , *CATALYST poisoning , *CATALYTIC reduction , *CATALYSTS , *POISONING , *SULFUR dioxide - Abstract
In this study, a series of K species or/and SO 2 poisoned Mn-Ce doped CuX (MCCX) catalysts were prepared from waste blast furnace slag (BFS), and the influence mechanism of K species or/and SO 2 poisoning on the catalysts in low-temperature NH 3 -SCR process was investigated. The results demonstrated that MCCX-KCl catalyst had poorer NO conversion than MCCX-K 2 O below 200 °C, and the co-existence of K species and SO 2 considerably inhibited NO conversion. Aggregation of the Cu active component might also be facilitated by co-poisoning with K species and SO 2. Furthermore, K species and SO 2 co-poisoned catalysts showed fewer isolated Cu2+ species and Mn4+ species than that of K-poisoned catalysts, indicating a decrease in active sites after the addition of SO 2. The co-effect of K 2 O/KCl and SO 2 species impaired the redox capacity and decreased the surface acidity than K-poisoned catalysts to a greater extent. Nevertheless, K-poisoning had little effect on the surface intermediates during SCR reaction process, and K-poisoned catalysts followed both Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanism. However, MCCX-KCl-SO 2 and MCCX-K 2 O-SO 2 catalysts contained fewer nitrate species, indicating that the co-effect of K species and SO 2 impeded the reaction between NO + O 2 species and pre-NH 3 species, thereby resulting in poor low-temperature NH 3 -SCR activity. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2022
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