NO decomposition over La-doped Cu-ZSM5 monolith under adsorption-reaction conditions

Authors:  Gianluca Landi, Luciana Lisi, Raffaele Pirone, Miriam Tortorelli, Gennaro Russo

Abstract:
The decomposition of nitrogen oxide has been studied under non steady state reaction conditions over a La-stabilised Cu-ZSM5 structured catalyst after adsorbing NO on the zeolite. The three main steps of the experiments are the following: (i) NO adsorption at 50^◦C until zeolite saturation, (ii) reactor isolation and heating up to the reaction temperature (480 or 520^◦C), (iii) cooling down back to 50^◦C re-opening the reactor once the adsorption temperature has been reached. No NOx are emitted during all steps. TPD tests have been performed after one or more cycles (i)–(iii) to check the mass balance. A very high NO conversion, much higher than those obtained under flowing (steady state) reaction conditions, is reached in all cycles. The unreacted NO is readsorbed on the zeolite in the step (iii). After two/three cycles (steps i–iii) the experiments a re repeatable.
      The effect of O₂ (2.5 vol.%) co-feeding during adsorption step has been also studied; the adsorption capacity during the first cycle is higher than that obtained under O2-free reaction conditions, while NO conversion decreased. After few cycles, adsorption capacity and NO conversion appeared unaffected by O₂ feed.

Keywords:
NOx abatement
Cu-ZSM5
Decomposition
Batch reaction
NO adsorption

Published in: Applied catalysis A: General  (Volumes 464–465, Pages 1-384, 15 August 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

NO decomposition over La-doped Cu-ZSM5 monolith under adsorption-reaction conditions

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