Shielding ceria based catalysts from SO2 poisoning in NH3-SCR reaction: Modification effect of acid metal oxides

被引：23
|
作者：
Cai, Yandi [1 ,2 ,3 ]
Zhang, Bifeng [1 ,2 ,3 ]
Yu, Haowei [1 ,2 ,3 ]
Ji, Xiaoyu [1 ,2 ,3 ]
Sun, Jingfang [1 ,2 ,3 ]
Wang, Xizhang [4 ,5 ]
Qian, Qiuhui [6 ]
Li, Lulu [7 ]
Liu, Annai [8 ]
Tan, Wei [1 ,2 ,3 ]
Gao, Fei [1 ,2 ,3 ]
Dong, Lin [1 ,2 ,3 ]
机构：
[1] Nanjing Univ, Sch Chem & Chem Engn, Key Lab Mesoscop Chem MOE, Nanjing 210023, Peoples R China
[2] Ctr Modern Anal, Jiangsu Key Lab Vehicle Emiss Control, Nanjing, Peoples R China
[3] Nanjing Univ, Sch Environm, Sch Chem & Chem Engn, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Peoples R China
[4] Nanjing Univ, Sch Chem & Chem Engn, Key Lab Mesoscop Chem MOE, Nanjing 210023, Peoples R China
[5] Nanjing Univ, Sch Chem & Chem Engn, Jiangsu Prov Lab Nanotechnol, Nanjing 210023, Peoples R China
[6] Suzhou Univ Sci & Technol, Sch Environm Sci & Engn, Natl & Local Joint Engn Lab Municipal Sewage Resou, Suzhou 215009, Peoples R China
[7] Jiangsu Univ Sci & Technol, Sch Environm & Chem Engn, Zhenjiang 212003, Peoples R China
[8] Sinopec Catalyst Co Ltd, Sinopec Grp, Beijing 100029, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2024年 / 342卷
基金：
中国国家自然科学基金;
关键词：
NH3-SCR; CeO2; Acid metal oxides; Shielding effect; SO2; resistance; IN-SITU DRIFTS; NOX REDUCTION; ACTIVE-SITES; SCR REACTION; SURFACE-STRUCTURE; MIXED-OXIDE; NH3; CEO2; PERFORMANCE; MECHANISM;
D O I：
10.1016/j.apcatb.2023.123424
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：
Modifying CeO2 with acid sites is a common strategy for designing efficient catalysts for the selective catalytic reduction of NOx by NH3 (NH3-SCR of NOx). However, the effect of acid metal oxide modification on the SO2 resistance of CeO2 has not been well revealed. In this work, it was found that the SO2 resistance of CeO2 modified with several acid metal oxides (i.e., MoO3, WO3 and Nb2O5), followed an order of Mo/CeO2 >= W/CeO2 > Nb/CeO2. Further systematic characterizations revealed that Mo-OH and W-OH on CeO2 as Br & oslash;nsted acid sites could better inhibit the SO2 adsorption and the sulfation of active sites than highly dispersed NbOx mainly as Lewis acid sites because NH4+ coordinated to Br & oslash;nsted acid sites could help trap SO2 to form ammonium sulfates rather than metal sulfates. The findings in this work provided important guidance for the design of efficient catalysts with superior SO2 resistance performance.
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页数：12
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