Pt-free sulphur resistant NOx traps

A thioresistant NOx trap based on CuO supported on sulphated zirconia mixed with a solid base is described. The rate of adsorption of NO at constant temperature and the amount of NO retained from a feed containing 750ppm NO, 10% O2 and 5% water in nitrogen were measured. On badly dispersed CuO, the...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2004-10, Vol.53 (1), p.21-27
Main Authors: Clacens, Jean-Marc, Montiel, Ramon, Kochkar, Hafedh, Figueras, François, Guyon, Marc, Beziat, Jean Christophe
Format: Article
Language:English
Subjects:
Catalysis
Chemical Sciences
Lean burn
NO adsorption
NOx trap
SO2 adsorption
Supported alkaline oxides
Thioresistance
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Summary:A thioresistant NOx trap based on CuO supported on sulphated zirconia mixed with a solid base is described. The rate of adsorption of NO at constant temperature and the amount of NO retained from a feed containing 750ppm NO, 10% O2 and 5% water in nitrogen were measured. On badly dispersed CuO, the capacity for NOx adsorption does not decrease but slightly increases in the presence of 25ppm SO2 in the feed. By contrast, a well dispersed Cu catalyst is irreversibly poisoned. The surface nitrates can be decomposed in air at 623K. In a mixture, Ar + 1% H2, the nitrate is partly reduced to N2 at about 630K, even after operation in the presence of SO2. The catalyst does not lose adsorption capacity after 10 cycles of adsorption–desorption and can be used in the temperature range 473–773K. The resistance to SO2 depends also in part of the properties of the solid base.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2004.04.014