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

被引：32
|
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
收藏
页码：20 / 28
页数：9
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