Study of the Co-Pt synergism for the selective catalytic reduction of NOx with CH4

被引:32
作者
Gutierrez, LB
Boix, AV
Lombardo, EA
Fierro, JLG
机构
[1] UNL, CONICET, FIQ, INCAPE, RA-3000 Santa Fe, Argentina
[2] Inst Catalisis & Petroleoquim, Madrid 28049, Spain
关键词
NOx reduction; PtCo-mordenite; SCR; Pt-Co synergism;
D O I
10.1006/jcat.2000.3143
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
The selective catalytic reduction of NOx with CH4 in excess oxygen with or without added water was conducted over a series of ion-exchanged mordenites. The fresh catalysts contained both Pt and Co cations in varying proportions. Different treatments of the solid either after or between exchanges were performed in order to learn about the beneficial effect of Pt added to Co-mordenite. Temperature-programmed reduction of the solids together with photoelectron spectroscopy provided information concerning the interaction, migration, and oxidation states of Co and Pt. These studies were performed over the fresh, reduced, and used catalysts. The best formulations have Co/Pt atomic ratios between 15 and 24 and they exhibit better water resistance than Co-mordenites. (C) 2001 Academic Press.
引用
收藏
页码:60 / 72
页数:13
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