Exceptional activity for NOx reduction at low temperatures using combinations of hydrogen and higher hydrocarbons on Ag/Al2O3 catalysts

被引：119

作者：

Burch, R

Breen, JP

Hill, CJ

Krutzsch, B

Konrad, B

Jobson, E

Cider, L

Eränen, K

Klingstedt, F

Lindfors, LE

机构：

[1] Queens Univ Belfast, Sch Chem, Belfast BT9 5AG, Antrim, North Ireland

[2] DaimlerChrysler AG, Res Body & Powertrain, Combustion Engines Exhaust Gas Aftertreatment, D-70546 Stuttgart, Germany

[3] Volvo Technol Corp AB, Dept 06130, SE-41288 Gothenburg, Sweden

[4] Abo Akad Univ, Lab Ind Chem, Proc Chem Grp, SF-20500 Turku, Finland

来源：

TOPICS IN CATALYSIS | 2004年 / 30-1卷 / 1-4期

关键词：

SCR of NOx; deNO(x); silver; alumina; Ag/Al2O3; hydrogen; hydrocarbon; mechanism;

D O I：

10.1023/B:TOCA.0000029722.12588.1f

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The effect of the addition of hydrogen on the SCR of NOx with a hydrocarbon reaction was investigated. It was found that hydrogen had a remarkable effect on the temperature range over which NO,. could be reduced during the SCR reaction with octane. Reduction of NOx was initiated at as low a temperature as 100 degreesC and > 95% NOx conversion was achieved over a temperature range of 200-450 degreesC. Hydrogen has the effect of activating octane at lower temperatures and also promotes the oxidation of NO to NO2 in the absence of hydrocarbon. Transient kinetic and in situ DRIFTS measurements indicated that hydrogen has a direct role in the reaction mechanism by either promoting the formation and storage of an organic C=N species which can then readily reduce NOx and/or removing a species which acts as a poison to the SCR reaction at low temperatures.

引用

页码：19 / 25

页数：7

共 11 条

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