Comparison of Pt-BaO/Al2O3 and Pt-CeO2/Al2O3 for NOx storage and reduction: Impact of cycling frequency

Zhou, Zhiyu; Harold, Michael P.; Luss, Dan

doi:10.1016/j.apcatb.2019.05.044

Comparison of Pt-BaO/Al₂O₃ and Pt-CeO₂/Al₂O₃ for NOx storage and reduction: Impact of cycling frequency

Journal Article · Tue May 14 00:00:00 EDT 2019 · Applied Catalysis B: Environmental

DOI:https://doi.org/10.1016/j.apcatb.2019.05.044· OSTI ID:1799465

Zhou, Zhiyu ^[1]; ^[2]; Luss, Dan ^[2]

Univ. of Houston, TX (United States); OSTI
Univ. of Houston, TX (United States)

NOx reduction under net lean and near-stoichiometric conditions was carried out on Pt/Al₂O₃, Pt/CeO₂/Al₂O₃ and Pt/BaO/Al₂O₃ washcoated monoliths to compare performance features and identify reaction pathways. The impact of the storage components (BaO, CeO₂) on the NOx conversion and byproduct (NH₃ and N₂O) yields was quantified for a range of feed temperatures, reductant types (H₂, and C₃H₆), O₂ feed concentrations, and cycle times. The NOx storage functionality is essential for NOx reduction under net lean conditions while the oxygen storage functionality promotes NOx reduction for near-stoichiometric conditions. NOx conversion by H₂ under lean conditions is dependent on the NOx storage capacity of the catalyst, with Pt/CeO₂/Al₂O₃ and Pt/BaO/Al₂O₃ exhibiting the highest NOx conversion below and above 300 °C, respectively. High NOx conversion is achieved over Pt/CeO₂/Al₂O₃ for anaerobic rich feeds at temperatures above 400 °C. Increasing the O₂ feed concentration enhances NOx conversion over Pt/CeO₂/Al₂O₃ below 400 °C but inhibits NOx conversion above 400 °C. The former is attributed to promotion of NO oxidation leading to NOx storage while the latter is attributed to O₂ inhibition of NO decomposition/reduction. Shorter cycle times increase the NOx conversion with C₃H₆ as reductant over Pt/BaO/Al₂O₃ under lean conditions and over PCA for the near-stoichiometric feed. The findings confirm that improved NOx storage utilization is mainly responsible for NOx conversion enhancement. A ceria redox pathway has only a secondary effect on NOx conversion under excess O₂.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Houston, TX (United States)

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

Grant/Contract Number:: EE0008233

OSTI ID:: 1799465

Journal Information:: Applied Catalysis B: Environmental, Journal Name: Applied Catalysis B: Environmental Vol. 255; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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