Effects of Na+ on Cu/SAPO-34 for ammonia selective catalytic reduction

被引：33

作者：

Wang, Can ^{[1
]}

Wang, Chen ^{[2
]}

Wang, Jun ^{[1
]}

Wang, Jianqiang ^{[1
]}

Shen, Meiqing ^{[1
,3
,4
]}

Li, Wei ^{[5
]}

机构：

[1] Tianjin Univ, Sch Chem Engn & Technol, State Educ Minist, Key Lab Green Chem Technol, Tianjin 300350, Peoples R China

[2] North Univ China, Sch Environm & Safety Engn, Taiyuan 030051, Shanxi, Peoples R China

[3] Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300350, Peoples R China

[4] Tianjin Univ, State Key Lab Engines, Tianjin 300350, Peoples R China

[5] Gen Motors Global Res & Dev, Chem Sci & Mat Syst Lab, 30500 Mound Rd, Warren, MI 48090 USA

来源：

JOURNAL OF ENVIRONMENTAL SCIENCES | 2018年 / 70卷

基金：

中国国家自然科学基金;

关键词：

Cu/SAPO-34; Ammonia selective catalytic reduction (NH3-SCR); Na effects; Ion-exchange; HYDROTHERMAL STABILITY; MOLECULAR-SIEVES; LOW-TEMPERATURE; ZSM-5; ZEOLITES; NH3-SCR; NOX; NH3; ALKALI; SCR; POTASSIUM;

D O I：

10.1016/j.jes.2017.11.002

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Copper-exchanged chabazite (Cu/CHA) catalysts have been found to be affected by alkalimetal and alkaline earth ions. However, the effects of Na+ ions on Cu/SAPO-34 for ammonia selective catalytic reduction (NH3-SCR) are still unclear. In order to investigate the mechanism, five sampleswith variousNa contents were synthesized and characterized. It was observed that the introduced Na+ ion-exchanges with H+ and Cu2+ of Cu/SAPO-34. The exchange of H+ is easier than that of isolated Cu2+. The exchanged Cu2+ ions aggregate and form "CuAl2O4-like" species. The NH3-SCR activity of Cu/SAPO-34 decreases with increasing Na content, and the loss of isolated Cu2+ and acid sites is responsible for the activity loss. (C) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

引用

页码：20 / 28

页数：9

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