Effect of Pr/Ce addition on the catalytic performance and SO2 resistance of highly dispersed MnOx/SAPO-34 catalyst for NH3-SCR at low temperature

被引：114

作者：

Yu, Chenglong ^{[1
]}

Huang, Bichun ^{[1
,2
]}

Dong, Lifu ^{[1
]}

Chen, Feng ^{[1
]}

Yang, Yue ^{[3
]}

Fan, Yinming ^{[1
]}

Yang, Yingxin ^{[1
]}

Liu, Xiaoqing ^{[1
]}

Wang, Xinnan ^{[1
]}

机构：

[1] South China Univ Technol, Guangzhou Higher Educ Mega Ctr, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China

[2] South China Univ Technol, Guangzhou Higher Educ Mega Ctr, Guangdong Prov Key Lab Atmospher Environm & Pollu, Guangzhou 510006, Guangdong, Peoples R China

[3] Yangjiang Polytech, Dept Life Food Sci & Technol Environm Engn, Yangjiang 529500, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2017年 / 316卷

基金：

中国国家自然科学基金;

关键词：

Ionic polarization; Low temperature SCR; PrOx-MnOx/SAPO-34; SO2; resistance; CARBON NANOTUBES; OXIDE CATALYSTS; SUPPORTED CATALYSTS; SCR ACTIVITY; REDUCTION; NO; NH3; TOLERANCE; MECHANISM; AMMONIA;

D O I：

10.1016/j.cej.2017.02.024

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Based on ionic polarization, a series of MeOx-MnOx/SAPo-34 (Me = Pr or Ce) catalysts were prepared by a simple solvent dispersion method and their low temperature ammonia-selective catalytic reduction (SCR) performance were tested with and without SO2. The highly dispersed MnOx/SAPO-34 catalyst was doped with Pr and showed better low temperature catalytic activity (140-280 degrees C) than that of the Ce-modified MnOx/SAPO-34. Also, the PrOx-MnOx/SAPO-34 presented good SO2 resistance performance with 100 ppm SO2 at 200 degrees C. Additionally, the fresh and SO2-poisoned catalysts were characterized by FE-SEM, BET, XRD, XPS, H-2-TPR, NH3-TPD and TG analysis. The results indicated that there was no obvious change in the crystal structure of the PrOx-MnOx/SAPO-34 sample. The MnOx/SAPO-34 catalyst was doped with Pr, which prevented the catalyst from being sulfated and inhibited the formation of ammonia sulfate on the catalyst surface. The SO2 may favor combination with PrOx over MnOx, which could form praseodymium sulfate and protect the manganese active sites to some extent, in accordance with the theory of ionic polarization. More than 80% NOx, conversion was provided by PrOx-MnOx/SAPO-34 catalysts in the presence of 100 ppm SO2 at 200 degrees C. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：1059 / 1068

页数：10

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