Pd-promoted WO3-ZrO2 for low temperature NOx storage

Ji, Yaying; Bai, Shuli; Xu, Dongyan; Qian, Dali; Wu, Zili; Song, Yang; Pace, Robert; Crocker, Mark; Wilson, Karen; Lee, Adam; Harris, Deb; Scapens, Dave

doi:10.1016/j.apcatb.2019.118499

Title: Pd-promoted WO₃-ZrO₂ for low temperature NOx storage

Journal Article · 30 November 2019 · Applied Catalysis B: Environmental

DOI: https://doi.org/10.1016/j.apcatb.2019.118499 · OSTI ID:1615187

Ji, Yaying ^[1]; Bai, Shuli ^[1];

^[2]; Qian, Dali ^[1];

^[3]; Song, Yang ^[1]; Pace, Robert ^[1]; Crocker, Mark ^[1];

^[4];

^[4]; Harris, Deb ^[5]; Scapens, Dave ^[5]

Univ. of Kentucky, Lexington, KY (United States)
Univ. of Kentucky, Lexington, KY (United States); Qingdao Univ. of Science and Technology (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
RMIT Univ., Melbourne, VIC (Australia)
Luxfer MEL Technologies, Manchester (United Kingdom)

Pd-promoted ZrO₂ and WO₃-ZrO₂ (W-Zr) were investigated for low temperature NOx adsorption and release. Pd-promoted W-Zr exhibited high NOx storage efficiency at short storage times, subsequently releasing ~95% of the stored NOx upon thermal ramping to 350 °C. DRIFTS studies demonstrated that Pd increased nitrate formation relative to nitrite during NOx storage on both Pd-Zr and Pd-W-Zr. Moreover, Pd sites on Pd-W-Zr played a major role in NOx storage, the ad-species being readily removed by 350 °C. From NO- and CO-DRIFTS data, it is inferred that Pd on the acidic W-Zr support was present as mainly cationic species, and was therefore able to adsorb NO, whereas on ZrO₂ Pd was not able to directly store NOx. Co-feeding CO with NO resulted in increased NOx storage capacity for Pd-W-Zr, which on the basis of DRIFTS measurements is attributed to the formation of Pd²⁺(CO)(NO) complexes.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Understanding and Control of Acid Gas-induced Evolution of Materials for Energy (UNCAGE-ME); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1615187

Alternate ID(s):: OSTI ID: 1702836

Journal Information:: Applied Catalysis B: Environmental, Vol. 264, Issue C; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Passive NOx adsorber
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Title: Pd-promoted WO3-ZrO2 for low temperature NOx storage

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Title: Pd-promoted WO₃-ZrO₂ for low temperature NOx storage