Poisoning effect of K with respect to Cu/ZSM-5 used for NO reduction

被引：24

作者：

Xue, Hongyan ^{[1
,2
]}

Guo, Xiaoming ^{[2
]}

Meng, Tao ^{[2
]}

Mao, Dongsen ^{[2
]}

Ma, Zhen ^{[1
,3
]}

机构：

[1] Fudan Univ, Shanghai Key Lab Atmospher Particle Pollut & Prev, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China

[2] Shanghai Inst Technol, Res Inst Appl Catalysis, Sch Chem & Environm Engn, Shanghai 201418, Peoples R China

[3] Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

来源：

COLLOID AND INTERFACE SCIENCE COMMUNICATIONS | 2021年 / 44卷

关键词：

NH3-SCR; NOx; K poisoning; Cu/ZSM-5; Reaction mechanisms; SELECTIVE CATALYTIC-REDUCTION; IN-SITU DRIFTS; V2O5/WO3-TIO2 SCR CATALYSTS; LOW-TEMPERATURE NH3-SCR; CHEMICAL DEACTIVATION; ENHANCED RESISTANCE; LUBRICATION OILS; OXIDE CATALYST; UREA SOLUTION; NITRIC-OXIDE;

D O I：

10.1016/j.colcom.2021.100465

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：

Cu/ZSM-5 is able to catalyze the reduction of NOx to N-2 (NH3-SCR), but the poisoning effect of K in this regard has been barely studied. Herein, the poisoning effect of K with respect to Cu/ZSM-5 in NH3-SCR was established via catalytic testing, and both Cu/ZSM-5 and K-poisoned Cu/ZSM-5 were probed by using XRD, N-2 sorption, TEM, H-2-TPR, XPS, NH3-TPD, and NO-TPD. In addition to these characterization tools, in-situ DRIFTS was employed to probe the adsorbed species and reaction intermediates, thus giving important information about the possible reaction mechanisms. In all, the presence of K led to decreased exposure of active CuO dispersed on ZSM-5, inhibited the adsorption of NH3 and NOx to some extent, minimized the formation of active bridged nitrate, and facilitated the formation of inactive bidentate nitrate.

引用

页数：9

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