Enhanced NO, CO and C3H6 conversion on Pt/Pd catalysts: Impact of oxygen storage material and catalyst architecture

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

doi:10.1016/j.cattod.2020.01.026

Title: Enhanced NO, CO and C₃H₆ conversion on Pt/Pd catalysts: Impact of oxygen storage material and catalyst architecture

Journal Article · Mon Jan 20 00:00:00 UTC 2020 · Catalysis Today

DOI: https://doi.org/10.1016/j.cattod.2020.01.026 · OSTI ID:1848742

Zhou, Zhiyu ^[1];

^[2]; Luss, Dan ^[2]

Univ. of Houston, TX (United States). Dept. of Chemical and Biomolecular Engineering; Univ. of Houston, TX (United States)
Univ. of Houston, TX (United States). Dept. of Chemical and Biomolecular Engineering

Simultaneous conversion of NO, CO and C₃H₆ under stoichiometric conditions was carried out on washcoated monoliths containing oxygen storage material (OSM)-promoted mixed Platinum group metals (PGM: Pt(95 %)/Pd(5 %)), to evaluate OSM promotion and to identify the best architecture. The studied OSMs include ceria-zirconia (Ce_0.3Zr_0.7O₂; CZO) and mixed metal oxide spinel (Mn_0.5Fe_2.5O₄; MFO). PGM supported directly on the OSM was found to be the best design for CZO, leading to a ~70 °C simultaneous decrease in the light-off temperature (T₈₀; feed temperature giving 80 % conversion) for NO, CO and C₃H₆ conversion compared to the alumina-supported PGM. Close coupling between the PGM and CZO is responsible for the activity promotion. In contrast, a dual-layer architecture (top PGM layer, bottom MFO layer) outperformed the MFO-supported PGM catalyst. The dual-layer PGM-MFO catalyst decreased the T₈₀ by ~50 °C for NO, CO and C₃H₆ conversion compared to the PGM-only catalyst. Enhancement obtained with the dual-layer PGM-MFO architecture relies on a direct catalytic contribution from the spinel. During lean/rich modulation the addition of CZO or spinel helps to mitigate the detrimental impact of modulation on NO, CO and C₃H₆ conversion above 400 °C. The data suggest that both CZO and MFO can buffer lean/rich modulation but exhibit preference to different reductants; CZO-supported PGM and dual-layer PGM-MFO show no conversion decrease during modulation for CO or C₃H₆ modulation, respectively. Dynamic oxygen storage capacity (DOSC) measurements show that the spinel exhibits ~10 times higher DOSC than CZO for both CO and C₃H₆ reductants. Both CO and C₃H₆ are equally effective reductants for the MFO but CO is better for CZO and PGM-deposited CZO. The study provides useful insight into benefits of OSM and provides guidance for optimization of the multi-component PGM + OSM catalyst composition and architecture.

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

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0008332

OSTI ID:: 1848742

Journal Information:: Catalysis Today, Journal Name: Catalysis Today Journal Issue: C Vol. 360; ISSN 0920-5861

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
42 ENGINEERING
Ceria
Chemistry
Engineering
Manganese
Oxygen storage capacity
Platinum
Spinel
Three-way catalyst

Title: Enhanced NO, CO and C3H6 conversion on Pt/Pd catalysts: Impact of oxygen storage material and catalyst architecture

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References (45)

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Title: Enhanced NO, CO and C₃H₆ conversion on Pt/Pd catalysts: Impact of oxygen storage material and catalyst architecture