期刊
FUEL
卷 329, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.125390
关键词
Nb doping; Citric acid method; Surface acidity; Mechanism; Dual redox cycle
资金
- National Key R & D Pro- gram of China [2018YFB0605002]
CuCeNbOx-0.4 catalyst prepared by the citric acid method exhibited excellent activity and selectivity in NH3-SCR process, with outstanding SO2 and H2O resistance as well as thermal stability. It had a large specific surface area, strong surface acidity, and effectively carried out SCR reaction at low temperatures, following the L-H and E-R mechanisms.
CuCeOx and CuCeNbOx-k with different Nb doping ratios were obtained by the citric acid method and applied in NH3-SCR process. The activity test results elucidated that the addition of Nb effectively ameliorated the low-temperature SCR performance. Among them, CuCeNbOx-0.4 catalyst had the finest SCR activity (more than 90% in 185-370 degrees C), highest N-2 selectivity, excellent SO2&H2O resistance and thermal stability. Numerous characterization analysis demonstrated that CuCeNbOx-0.4 had the largest specific surface area, the strongest surface acidity and the most excellent redox properties. The conclusions of in situ DRIFT manifested the Nb modification generated more activated species, enhanced the reactivity of ad-NH3 and ad-NOx species, and the SCR reaction on CuCeNbOx-0.4 mainly followed the Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms. Furthermore, the Nb doping also formed the dual redox cycle (Cu2+ + Nb4+ <-> Cu+ + Nb5+, Cu2+ + Ce3+ <-> Cu+ + Ce4+), which facilitated the low-temperature SCR reaction.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据