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

Paper ID Volume ID Publish Year Pages File Format Full-Text
40106 45844 2013 7 PDF Available
Title
NO decomposition over La-doped Cu-ZSM5 monolith under adsorption-reaction conditions
Abstract

•NO decomposition can be performed under adsorption/reaction conditions on LaCu-ZSM5.•No NO emission occurs due to temperature swing between adsorption and reaction.•The adsorption/decomposition is effective even in the presence of 2.5 vol.% O2.•100% NO conversion is attained during cyclic operation.•No sign of deactivation is detected after several adsorption/reaction cycles.

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 re-adsorbed on the zeolite in the step (iii). After two/three cycles (steps i–iii) the experiments are 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.

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Keywords
NOx abatement; Cu-ZSM5; Decomposition; Batch reaction; NO adsorption
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NO decomposition over La-doped Cu-ZSM5 monolith under adsorption-reaction conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 464–465, 15 August 2013, Pages 61–67
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us