Comparison of the poisoning mechanism of different zinc species on Nb-Doped Ce-Ti SCR catalysts

被引：7
|
作者：
Jiang, Ye [1 ,2 ]
Sun, Xin [1 ,2 ]
Zhang, Guomeng [1 ,2 ]
Xu, Yichao [1 ,2 ]
Dou, Xiao [1 ,2 ]
Liu, Yanan [1 ,2 ]
Han, Da [1 ,2 ]
Yang, Zhengda [1 ,2 ]
机构：
[1] China Univ Petr East China, Coll New Energy, 66 West Changjiang Rd, Qingdao 66580, Peoples R China
[2] Qingdao Engn Res Ctr Efficient & Clean Utilizat Fo, Qingdao 66580, Peoples R China
来源：
FUEL | 2024年 / 357卷
基金：
中国国家自然科学基金;
关键词：
Ceria-based catalyst; Deactivation; Zinc species; NH3-SCR; DFT calculation; MSWI FLY-ASH; SIMULTANEOUS REMOVAL; MN/TIO2; CATALYST; NH3-SCR REACTION; FLUE-GAS; NO; REDUCTION; SO2; PERFORMANCE; RESISTANCE;
D O I：
10.1016/j.fuel.2023.129820
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
The effect of different Zn species (ZnSO4, ZnCl2, and ZnO) on Nb-doped Ce-Ti catalyst (CNT) was explored with XRD, N-2 physisorption, NH3-TPD, H-2-TPR, XPS, in situ DRIFTS and DFT calculation. The experimental results show that the deactivation rate of CNT by different Zn species was in the order: CNT-ZC > CNT-ZO > CNT-ZS. Nb doping enhanced the acidity of Ce-Ti catalyst and protected Ce active sites from different Zn species. After different Zn species were loaded on CNT, its specific surface area decreased, and the acid sites were occupied. The results from in situ DRIFTS demonstrated that, after anion poisoning, anions (SO42-, O2-, and Cl-) would create new NH3 adsorption sites while theoretical calculations also indicated that NH3 adsorption was enhanced by the poisoning of anions, but the activation of adsorbed NH3 was more difficult. Finally, in situ DRIFTS reveals that the SCR reaction on CNT is still under both E-R and L-H mechanisms.
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页数：12
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