Investigation of NO adsorption and desorption phenomena on a Pd/ZSM-5 passive NOx adsorber

Gu, Yuntao; Sinha Majumdar, Sreshtha; Pihl, Josh A.; Epling, William S.

doi:10.1016/j.apcatb.2021.120561

Title: Investigation of NO adsorption and desorption phenomena on a Pd/ZSM-5 passive NO_x adsorber

Journal Article · 28 July 2021 · Applied Catalysis B: Environmental

DOI: https://doi.org/10.1016/j.apcatb.2021.120561 · OSTI ID:1814373

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Univ. of Virginia, Charlottesville, VA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Transportation Research Center (NTRC)

Pd-based zeolite materials have gained significant attention as passive NO_x adsorbers (PNAs) for diesel-engine cold-start NO_x mitigation due to their ability to store NO_x at low temperatures. Pd/ZSM-5 is a promising PNA candidate, however, the NO adsorption mechanism over this material is not well understood. This study combines flow reactor experiments and surface spectroscopy to investigate NO adsorption under a variety of conditions. Furthermore, the state of hydration of the Pd cations played an important role in determining the impact of H₂O and CO concentration on the PNA performance. Below 150 °C, the inhibition effect of H₂O on NO adsorption was mitigated by CO. Due to dehydration, neither H₂O nor CO had an impact on NO uptake at 150 °C, where maximum NO storage capacity of the PNA was also observed. The observed gas composition and temperature effects on NO adsorption and formation of surface intermediates ultimately inform a proposed mechanism.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1814373

Journal Information:: Applied Catalysis B: Environmental, Journal Name: Applied Catalysis B: Environmental Journal Issue: X Vol. 298; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Investigation of NO adsorption and desorption phenomena on a Pd/ZSM-5 passive NOx adsorber

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Title: Investigation of NO adsorption and desorption phenomena on a Pd/ZSM-5 passive NO_x adsorber