ESR study of competition between Fe3+ and Cu2+ active sites for NOx selective catalytic reduction by NH3 in Cu-Fe-Beta catalyst

被引：20
|
作者：
Kucherov, Alexei V. [1 ]
Doronkin, Dmitry E. [1 ]
Stakheev, Alexandr Yu. [1 ]
Kustov, Arkady L. [2 ]
Grill, Marie [2 ]
机构：
[1] Russian Acad Sci, ND Zelinskii Organ Chem Inst, Moscow 119991, Russia
[2] Haldor Topsoe Res Labs, DK-2800 Lyngby, Denmark
来源：
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2010年 / 325卷 / 1-2期
关键词：
Cu-Fe-Beta; NOx-SCR; ESR; NITRIC-OXIDE; ALPHA-SITES; FE-ZSM-5; CUH-ZSM-5; N2O; STABILITY; ZEOLITE; BENZENE; FEZSM-5; COPPER;
D O I：
10.1016/j.molcata.2010.03.035
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A series of Fe-Beta catalysts modified with different amount of Cu was prepared and tested in NOx selective catalytic reduction by NH3. ESR study reveals that replacement of isolated tetrahedral Fe3+ ions by Cu2+ ions in cationic sites of the zeolite takes place upon Fe-Beta treatment by copper. This modification results in gain in deNO(x) activity in low-temperature region, due to formation of cationic Cu2+, and significant loss in activity at high temperatures, which is determined by substitution of active Fe3+ for less active Cu2+. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：73 / 78
页数：6
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