Effects of four-mode hydrothermal aging on three-way catalysts for passive selective catalytic reduction to control emissions from lean-burn gasoline engine

Thomas, Calvin R.; Pihl, Josh A.; Lance, Michael J.; Toops, Todd J.; Parks, II, James E.; Lauterbach, Jochen

doi:10.1016/j.apcatb.2018.11.051

Effects of four-mode hydrothermal aging on three-way catalysts for passive selective catalytic reduction to control emissions from lean-burn gasoline engine

Journal Article · Mon Nov 19 00:00:00 EST 2018 · Applied Catalysis B: Environmental

DOI:https://doi.org/10.1016/j.apcatb.2018.11.051· OSTI ID:1494010

Thomas, Calvin R. ^[1]; ^[2]; ^[2]; ^[2]; ^[2]; Lauterbach, Jochen ^[1]

Univ. of South Carolina, Columbia, SC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Passive selective catalytic reduction (SCR) is a promising approach for the control of NOX emissions in lean burn gasoline exhausts. It requires ammonia (NH₃) to be produced over a three-way catalyst (TWC) during periods of fuel-rich operation for the reduction of NO_X during periods of fuel-lean operation. Previous research has shown the viability of this system but has not examined the effects of hydrothermal degradation. This work is focused on evaluating the effects of hydrothermal aging on the TWC in a passive SCR system. Two catalysts were studied: a Pd-TWC, and a NO_X storage and reduction (NSR) TWC. Samples were aged at 920 °C for 100 h using a four-mode hydrothermal aging procedure. This causes the catalyst to be oxidized and reduced, as it would in a real system. The effects of aging were evaluated using simulated exhaust under both steady state and lean-rich cycling conditions. Hydrothermal aging caused significant changes in catalyst activity, leading to a decrease in low temperature conversion of carbon monoxide (CO) and propane (C₃H₈) on both catalysts, and degradation of oxygen storage and NO_X storage components. Furthermore, the catalysts maintained their activity for NO_X conversion and NH₃ production, showing sufficient activity for the operation of a passive SCR with an optimum projected fuel consumption of 92–98% compared to stoichiometric operation.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1494010

Journal Information:: Applied Catalysis B: Environmental, Journal Name: Applied Catalysis B: Environmental Journal Issue: C Vol. 244; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Hydrothermal aging
Passive selective catalytic reduction
Three-way catalyst

Effects of four-mode hydrothermal aging on three-way catalysts for passive selective catalytic reduction to control emissions from lean-burn gasoline engine

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