Alumina supported cobalt-palladium catalysts for the reduction of NO by methane in stationary sources

被引:20
作者
Marques, Rui
El Kabouss, Kaoutar
Da Costa, Patrick
Da Costa, Stephanie
Delacroix, Franck
Djega-Mariadassou, Gerald
机构
[1] Gaz France, Direct Rech, F-93211 La Plaine St Denis, France
[2] Univ Paris 06, CNRS, UMR 7609, Lab React Surface, F-75252 Paris 05, France
[3] Univ Paris 07, CNRS, UMR 7086, ITODYS,Grp LCMDC, F-75251 Paris 05, France
[4] ADEME, F-49004 Angers, France
关键词
stationary sources; methane; deNO(x); three-function model;
D O I
10.1016/j.cattod.2006.08.019
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
In order to improve a "Three Function Catalysts Model", the present paper deals with alumina based catalysts containing cobalt and palladium for the NO reduction by methane. The deNO(x) temperature window was estimated by adsorption and subsequent desorption of NO in lean conditions. Two NO, desorption peaks were detected for both catalysts. For Pd(0.63)Co(0.58)/Al2O3, the two desorption peaks appeared at 205 and 423 degrees C, whereas for Pd(0.14)Co(0.57)/Al2O3, the maxima desorption temperature peaks were at 205 and 487 degrees C. In addition, NO oxidation was also studied to evaluate the catalyst first function. It was found that, the oxidation begins on Co-Pd/Al2O3 around 250 degrees C. On Pd(0.63)Co(0.8)/Al2O3, 8% of deNO(x) were found in the range of the second NO, desorption peak temperature (410 degrees C). During TPSR, CxHyOz species such as formaldehyde were detected. These oxygenate species are the reactive intermediate for deNO(x) by methane. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:166 / 174
页数:9
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