Excellent low-temperature activity and resistance to K-poisoning in NH3-SCR de-NOx reaction over CeSnOx with phosphorylation treatment catalyst

被引：7
作者：
Wang, Ziting [1 ]
Yao, Mihang [1 ]
Niu, Xiaoyu [1 ]
Zhu, Yujun [1 ]
机构：
[1] Heilongjiang Univ, Key Lab Funct Inorgan Mat Chem, Sch Chem & Mat, Minist Educ, Harbin 150080, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2024年 / 359卷
基金：
中国国家自然科学基金;
关键词：
Selective catalytic reduction with NH3; NOx elimination; Phosphorylation; Ce-Sn oxides catalyst; Resistance to K poisoning; MIXED-OXIDE CATALYST; CE-TI CATALYST; CE/TIO2; CATALYST; ENHANCED ACTIVITY; REDUCTION; SO2; SN; DEACTIVATION; MECHANISM; PERFORMANCE;
D O I：
10.1016/j.apcatb.2024.124464
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Resistance to alkali metal poisoning remains a challenge for Ce-based denitration (de-NOx) catalysts. In this paper, improved low-temperature performance and resistance to K poisoning were achieved by phosphorylating CeSnOx. The activity tests revealed that the phosphorylated CeSnOx (3 wt%P/CeSn) exhibited over 90 % NO conversion at 190-450 degrees C and >90 % NO conversion at 240-400 degrees C even after K poisoning. The mechanism of phosphorylation treatment against K poisoning was investigated by many characterizations and DFT calculation. The results showed that the phosphorylation treatment facilitated the interaction between Ce and Sn, and K interacts more preferentially with PO43- species. This prevents K from destroying the Ce-O-Sn structure to form a Ce-O-K structure, which in turn maintained the catalyst's redox properties. Moreover, the phosphorylation treatment supplemented the acidity of 3 wt%P/CeSn compared with CeSnOx. This effectively mitigated the reduction of acidity caused by K and ensured the adsorption and activation of NH3 on the catalyst surface.
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页数：16
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