Deactivation of Three-Way Catalysts Coated within Gasoline Particulate Filters by Engine-Oil-Derived Chemicals

Heeje Seong; Seungmok Choi; Sungsik Lee; Nestor J. Zaluzec; Todd J. Toops; Michael J. Lance; Daekun Kim; Ke Nguyen

doi:10.1021/acs.iecr.9b00342

Deactivation of Three-Way Catalysts Coated within Gasoline Particulate Filters by Engine-Oil-Derived Chemicals

Heeje Seong, Seungmok Choi, Sungsik Lee, Nestor J. Zaluzec, Todd J. Toops, Michael J. Lance, Daekun Kim, Ke Nguyen

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Three-way catalysts (TWC) coated within gasoline particulate filter (GPF) walls (TWC/GPF) were tested in a gasoline direct injection (GDI) engine to investigate the impact of engine oil-derived chemicals on TWC performance and possible deactivation factors. Catalyst performance of the lab-aged TWC/GPFs was retarded with ash loading, especially NOx conversions under 300 °C. Characterization results from the lab-aging condition show that while the disruption of oxygen storage capacity (OSC) materials was found to be minor or negligible, Pd particle growth and weakened Pd-OSC interaction were observed. In comparison, the field-aged TWC/GPF showed more apparent degradation of TWC components due to engine-oil-derived chemicals; the formation of CePO₄ and Ce₂(SO₄)₄ results in decreasing OSC that lowers oxygen release capability, in addition to more noticeable Pd particle growth and weakened Pd-OSC interaction. Different from the lab-aged TWC/GPF, the degree of deactivation in the field-aged TWC/GPF appeared to increase along the direction of the flow path in the order of outlet > mid > inlet, proposing that engine-oil-derived chemicals accelerated TWC deactivation when combined with increased exhaust temperatures.

Original language	English
Pages (from-to)	10724-10736
Number of pages	13
Journal	Industrial and Engineering Chemistry Research
Volume	58
Issue number	25
DOIs	https://doi.org/10.1021/acs.iecr.9b00342
State	Published - Jun 26 2019

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title = "Deactivation of Three-Way Catalysts Coated within Gasoline Particulate Filters by Engine-Oil-Derived Chemicals",

abstract = "Three-way catalysts (TWC) coated within gasoline particulate filter (GPF) walls (TWC/GPF) were tested in a gasoline direct injection (GDI) engine to investigate the impact of engine oil-derived chemicals on TWC performance and possible deactivation factors. Catalyst performance of the lab-aged TWC/GPFs was retarded with ash loading, especially NOx conversions under 300 °C. Characterization results from the lab-aging condition show that while the disruption of oxygen storage capacity (OSC) materials was found to be minor or negligible, Pd particle growth and weakened Pd-OSC interaction were observed. In comparison, the field-aged TWC/GPF showed more apparent degradation of TWC components due to engine-oil-derived chemicals; the formation of CePO4 and Ce2(SO4)4 results in decreasing OSC that lowers oxygen release capability, in addition to more noticeable Pd particle growth and weakened Pd-OSC interaction. Different from the lab-aged TWC/GPF, the degree of deactivation in the field-aged TWC/GPF appeared to increase along the direction of the flow path in the order of outlet > mid > inlet, proposing that engine-oil-derived chemicals accelerated TWC deactivation when combined with increased exhaust temperatures.",

author = "Heeje Seong and Seungmok Choi and Sungsik Lee and Zaluzec, {Nestor J.} and Toops, {Todd J.} and Lance, {Michael J.} and Daekun Kim and Ke Nguyen",

note = "Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",

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doi = "10.1021/acs.iecr.9b00342",

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AU - Seong, Heeje

AU - Choi, Seungmok

AU - Lee, Sungsik

AU - Zaluzec, Nestor J.

AU - Toops, Todd J.

AU - Lance, Michael J.

AU - Kim, Daekun

AU - Nguyen, Ke

PY - 2019/6/26

Y1 - 2019/6/26

N2 - Three-way catalysts (TWC) coated within gasoline particulate filter (GPF) walls (TWC/GPF) were tested in a gasoline direct injection (GDI) engine to investigate the impact of engine oil-derived chemicals on TWC performance and possible deactivation factors. Catalyst performance of the lab-aged TWC/GPFs was retarded with ash loading, especially NOx conversions under 300 °C. Characterization results from the lab-aging condition show that while the disruption of oxygen storage capacity (OSC) materials was found to be minor or negligible, Pd particle growth and weakened Pd-OSC interaction were observed. In comparison, the field-aged TWC/GPF showed more apparent degradation of TWC components due to engine-oil-derived chemicals; the formation of CePO4 and Ce2(SO4)4 results in decreasing OSC that lowers oxygen release capability, in addition to more noticeable Pd particle growth and weakened Pd-OSC interaction. Different from the lab-aged TWC/GPF, the degree of deactivation in the field-aged TWC/GPF appeared to increase along the direction of the flow path in the order of outlet > mid > inlet, proposing that engine-oil-derived chemicals accelerated TWC deactivation when combined with increased exhaust temperatures.

AB - Three-way catalysts (TWC) coated within gasoline particulate filter (GPF) walls (TWC/GPF) were tested in a gasoline direct injection (GDI) engine to investigate the impact of engine oil-derived chemicals on TWC performance and possible deactivation factors. Catalyst performance of the lab-aged TWC/GPFs was retarded with ash loading, especially NOx conversions under 300 °C. Characterization results from the lab-aging condition show that while the disruption of oxygen storage capacity (OSC) materials was found to be minor or negligible, Pd particle growth and weakened Pd-OSC interaction were observed. In comparison, the field-aged TWC/GPF showed more apparent degradation of TWC components due to engine-oil-derived chemicals; the formation of CePO4 and Ce2(SO4)4 results in decreasing OSC that lowers oxygen release capability, in addition to more noticeable Pd particle growth and weakened Pd-OSC interaction. Different from the lab-aged TWC/GPF, the degree of deactivation in the field-aged TWC/GPF appeared to increase along the direction of the flow path in the order of outlet > mid > inlet, proposing that engine-oil-derived chemicals accelerated TWC deactivation when combined with increased exhaust temperatures.

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Deactivation of Three-Way Catalysts Coated within Gasoline Particulate Filters by Engine-Oil-Derived Chemicals

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