Nitrates and fast SCR reaction in NOx removal from Diesel engine exhausts

被引：0
|
作者：
Nova, Isabella [1 ]
Grossale, Antonio [1 ]
Tronconi, Enrico [1 ]
机构：
[1] Politecn Milan, Dipartimento Energia, Lab Catalysis & Catalyt Proc, I-20133 Milan, Italy
来源：
CHIMICA OGGI-CHEMISTRY TODAY | 2009年 / 27卷 / 03期
关键词：
SELECTIVE CATALYTIC-REDUCTION; V-BASED CATALYST; LOW-TEMPERATURES; MECHANISM; NH3-SCR; AMMONIA; CHEMISTRY; FE-ZSM5; NH3;
D O I：
暂无
中图分类号：
Q81 [生物工程学（生物技术）]; Q93 [微生物学];
学科分类号：
071005 ; 0836 ; 090102 ; 100705 ;
摘要：
We review in the present paper the key mechanistic features of the NH(3)-NO/NO(2) Fast SCR reaction over vanadium and Fe-zeolite commercial catalysts: this is the main reaction occurring in the urea-SCR technology, that is currently considered the best technique for the abatement of NOx in the exhausts of Diesel engines. A detailed investigation by means of dynamic reactive experiments led to the proposal of an original scheme which accounts for stoichiometry, selectivity and intrinsic kinetics of the global SCR process: NO(2) forms surface nitrites and nitrates via dimerization and disproportionation/heterolytic chemisorption, NO reduces nitrates to nitrites, and NH(3) enables the rapid and selective decomposition of nitrites to nitrogen via formation of unstable ammonium nitrite.
引用
收藏
页码：17 / 19
页数：3
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