燃料化学学报Issue(6)：743-750,8.
Cu交换量对Cu-SAPO-34催化剂上NH3选择性催化还原NOx 反应的影响
Effects of copper content in Cu-SAPO-34 on its catalytic performance in NH3-SCR of NOx
闫春迪 1程昊 2王树东1
作者信息
- 1. 中国科学院大连化学物理研究所 洁净能源国家实验室，辽宁 大连 116023
- 2. 中国科学院大学，北京 100049
- 折叠
摘要
Abstract
A series of Cu-SAPO-34 catalysts with various Cu contents were prepared by using different kinds of ammonium salts and adjusting Cu2+ ion exchange time; their catalytic performance and hydrothermal stability in selectively catalytic reduction of NOx with NH3( NH3-SCR) were investigated. The results showed that Cu2+ions are the predominant active sites in Cu-SAPO-34 for the NH3-SCR of NOx . With the increase of Cu content, the activity of Cu-SAPO-34 at low temperature is increased at first and then decreased. With a Cu content of 2. 37%, the Cu-SAPO-34 catalyst exhibits the best low temperature activity; over it, the conversion of NOx is higher than 80. 0% at 185℃ and may even reach 98. 7%. ICP, H2-TPR, FT-IR and NH3-TPD results illustrated that the introduction of Cu into SAPO-34 leads to an addition of new adsorption sites for ammonia, an increase of Lewis acid sites and a decrease of the adsorption strength of NH3 on SAPO-34. However, a further increase of Cu loading (e. g. 2. 90%) results in a decrease of Cu-SAPO-34 activity in SCR, which may be ascribed to the replacement of H in Si-OH-Al by Cu2+that hinders the adsorption, storage and migration of NH3 in NH3-SCR. In addition, excessive loading of Cu is probably detrimental to the hydrothermal stability of the Cu-SAPO-34 catalyst.关键词
Cu-SAPO-34/氨选择性催化还原/铜交换量/酸性位/水热稳定性Key words
Cu-SAPO-34/NH3-SCR/Cu content/acid site/hydrothermal stability分类
化学化工引用本文复制引用
闫春迪,程昊,王树东..Cu交换量对Cu-SAPO-34催化剂上NH3选择性催化还原NOx 反应的影响[J].燃料化学学报,2014,(6):743-750,8.
