Engineering HC-SCR:: Improved low temperature performance through a cascade concept

被引：19
作者：
Arve, K [1 ]
Klingstedt, F [1 ]
Eränen, K [1 ]
Lindfors, LE [1 ]
Murzin, DY [1 ]
机构：
[1] Abo Akad Univ, Lab Ind Chem, Proc Chem Ctr, SF-20500 Turku, Finland
来源：
CATALYSIS LETTERS | 2005年 / 105卷 / 3-4期
关键词：
engineering HC-SCR; Ag/alumina and Cu-ZSM-5 catalyst; catalyst cascade concept;
D O I：
10.1007/s10562-005-8682-9
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 catalytic after treatment system for lean HC-SCR was constructed of two different catalyst beds, e.g. of a Ag/alumina and Cu-ZSM-5 catalyst (cascade concept). The improved activity especially at low temperature range was found to be due to the synergetic effect of the two catalysts, which combines the transformation of the feed gas over Ag/alumina to such compounds that are highly reactive towards N-2 over Cu-ZSM-5. The effluent coming from the Ag/alumina bed was analysed by GC-MS along with the NO to N-2 conversion over the whole system by GC. The results obtained from the GC-MS measurements revealed that hydrocarbon used as a reducing agent is oxidised and that besides oxygenates also various N-containing hydrocarbons are formed over the Ag/Al2O3.
引用
收藏
页码：133 / 138
页数：6
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