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CuH-ZSM-5 as hydrocarbon trap under cold start conditions

AuthorsNavlani-García, Miriam; Puértolas Lacambra, Begoña; Lozano-Castelló, D.; Cazorla-Amorós, D.; Navarro López, María Victoria ; García Martínez, Tomás
Issue Date22-May-2013
PublisherAmerican Chemical Society
CitationEnvironmental Science and Technology 47(11): 5851-5857 (2013)
AbstractCold start tests are carried out to evaluate the performance of copper-exchanged zeolites as hydrocarbon traps under simulated gasoline car exhaust gases, paying special attention to the role of copper in the performance of these zeolites. It is concluded that the partial substitution of the protons in the parent H-ZSM-5 zeolite is highly beneficial for hydrocarbon trapping due to the formation of selective adsorption sites with specific affinity for the different exhaust components. However, it is also observed that uncontrolled exchanging process conditions could lead to the presence of CuO nanoparticles in the zeolite surface, which seem to block the pore structure of the zeolite, decreasing the hydrocarbon trap efficiency. Among all the zeolites studied, the results point out that a CuH-ZSM-5 with a partial substitution of extra-framework protons by copper cations and without any detectable surface CuO nanoparticles is the zeolite that showed the best performance under simulated cold start conditions due to both the high stability and the hydrocarbon retaining capacity of this sample during the consecutive cycles.
Description4 figures, 1 table.-- This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science and Technology, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/es304880b.
Publisher version (URL)http://dx.doi.org/10.1021/es304880b
Identifiersdoi: 10.1021/es304880b
issn: 0013-936X
e-issn: 1520-5851
Appears in Collections:(ICB) Artículos
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