Investigating anomalous growth of platinum particles during accelerated aging of diesel oxidation catalysts

Kunwar, Deepak; Carrillo, Cristhian; Xiong, Haifeng; Peterson, Eric; DeLaRiva, Andrew; Ghosh, Arnab; Qi, Gongshin; Yang, Ming; Wiebenga, Michelle; Oh, Se; Li, Wei; Datye, Abhaya K.

doi:10.1016/j.apcatb.2020.118598

Title: Investigating anomalous growth of platinum particles during accelerated aging of diesel oxidation catalysts

Journal Article · 06 January 2020 · Applied Catalysis B: Environmental

DOI: https://doi.org/10.1016/j.apcatb.2020.118598 · OSTI ID:1800254

Kunwar, Deepak ^[1]; Carrillo, Cristhian ^[2];

^[2]; Peterson, Eric ^[2]; DeLaRiva, Andrew ^[2]; Ghosh, Arnab ^[2]; Qi, Gongshin ^[3]; Yang, Ming ^[3]; Wiebenga, Michelle ^[3]; Oh, Se ^[3]; Li, Wei ^[3];

^[2]

Univ. of New Mexico, Albuquerque, NM (United States); OSTI
Univ. of New Mexico, Albuquerque, NM (United States)
General Motors LLC, Warren, MI (United States). Chemical and Materials Systems Lab

When Pt catalysts are aged in air at 800 °C, one sees significant growth of Pt particle sizes. The particle size distributions in the aged catalysts are usually bimodal, with some very large particles coexisting with smaller particles. Here we investigate the origins of these anomalous particle size distributions and relate them to the vapor phase transport of PtO₂ under oxidizing conditions. Our results suggest that the emission of PtO₂ from the catalyst into vapor phase could be a cause for the anomalous growth of Pt particles observed during high temperature aging. We show that supports such as ceria that can trap Pt ions cause a suppression of vapor phase transport, while the alumina and the MgAl₂O₄ spinel supports are unable to trap the Pt ions leading to the formation of abnormally large Pt particles.

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Research Organization:: University of New Mexico, Albuquerque, NM (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER15712

OSTI ID:: 1800254

Journal Information:: Applied Catalysis B: Environmental, Journal Name: Applied Catalysis B: Environmental Journal Issue: C Vol. 266; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CO oxidation
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Title: Investigating anomalous growth of platinum particles during accelerated aging of diesel oxidation catalysts

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