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NO adsorption during lean-rich cycles on Pt–Ba/γ-Al2O3 traps in a gas stream simulating the exhaust of gasoline engines

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Abstract

The NO adsorption–desorption from traps composed of 8 wt% of Ba and 2 wt% of Pt deposited on γ-Al2O3 was studied. It was found that there was an important effect of the barium salt used (nitrate or acetate) on the trap performance. The exposition of the traps to NO presence at room temperature led to the formation of barium nitrites and nitrates, species that decomposed between 80 and 230 °C, and 400–580 °C, respectively. Furthermore, the NO adsorption capacity showed a complex dependence upon the O2 and SO2 content in the reaction feed stream, whereas the H2O presence had no observable effects. The NOx adsorption capacity on the tested traps increased with the content of oxygen in the feed stream, and decreased irreversibly with the SO2 presence.

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Acknowledgments

The authors acknowledge the financial support of the Consejo Nacional de Ciencia y Tecnología (Grants 400200-5-29272U and 400200-5–38049U) and the Universidad Autónoma Metropolitana-Iztapalapa for the infrastructure provided. Also, Ariadna A. Morales-Pérez acknowledges the graduate scholarship (130389) provided by the Consejo Nacional de Ciencia y Tecnología (CONACYT).

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Authors and Affiliations

  1. Departamento de Ingeniería de Procesos e Hidráulica, Universidad Autónoma Metropolitana-Iztapalapa, A. P. 55-534, C.P. 09340, Mexico, D. F., Mexico

    Ariadna A. Morales-Pérez & Gustavo A. Fuentes

  2. Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, UANL, Av. Universidad S/N, Ciudad Universitaria, C.P. 66451, San Nicolás de los Garza, N. L., Mexico

    A. Martínez-Hernández

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  1. Ariadna A. Morales-Pérez
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  2. A. Martínez-Hernández
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  3. Gustavo A. Fuentes
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Correspondence to A. Martínez-Hernández.

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Morales-Pérez, A.A., Martínez-Hernández, A. & Fuentes, G.A. NO adsorption during lean-rich cycles on Pt–Ba/γ-Al2O3 traps in a gas stream simulating the exhaust of gasoline engines. Adsorption 21, 677–686 (2015). https://doi.org/10.1007/s10450-015-9718-0

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  • DOI: https://doi.org/10.1007/s10450-015-9718-0

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