Structure–activity relationships of Pt/Al2O3 catalysts for CO and NO oxidation at diesel exhaust conditions

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Structure–activity relationships of Pt/Al2O3 catalysts for CO and NO oxidation at diesel exhaust conditions. / Boubnov, Alexey; Dahl, Søren; Johnson, Erik; Molina, Anna Puig; Simonsen, Søren Bredmose; Cano, Fernando Morales; Helveg, Stig; Lemus-Yegres, Lived J.; Grunwaldt, Jan-Dierk.

In: Applied Catalysis B: Environmental, Vol. 126, 2012, p. 315-325.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Author

Boubnov, Alexey; Dahl, Søren; Johnson, Erik; Molina, Anna Puig; Simonsen, Søren Bredmose; Cano, Fernando Morales; Helveg, Stig; Lemus-Yegres, Lived J.; Grunwaldt, Jan-Dierk / Structure–activity relationships of Pt/Al2O3 catalysts for CO and NO oxidation at diesel exhaust conditions.

In: Applied Catalysis B: Environmental, Vol. 126, 2012, p. 315-325.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Bibtex

@article{549ed8af8dd44291b1fe494475643ca9,
title = "Structure–activity relationships of Pt/Al<sub>2</sub>O<sub>3</sub> catalysts for CO and NO oxidation at diesel exhaust conditions",
publisher = "Elsevier BV",
author = "Alexey Boubnov and Søren Dahl and Erik Johnson and Molina, {Anna Puig} and Simonsen, {Søren Bredmose} and Cano, {Fernando Morales} and Stig Helveg and Lemus-Yegres, {Lived J.} and Jan-Dierk Grunwaldt",
year = "2012",
doi = "10.1016/j.apcatb.2012.07.029",
volume = "126",
pages = "315--325",
journal = "Applied Catalysis B: Environmental",
issn = "0926-3373",

}

RIS

TY - JOUR

T1 - Structure–activity relationships of Pt/Al<sub>2</sub>O<sub>3</sub> catalysts for CO and NO oxidation at diesel exhaust conditions

A1 - Boubnov,Alexey

A1 - Dahl,Søren

A1 - Johnson,Erik

A1 - Molina,Anna Puig

A1 - Simonsen,Søren Bredmose

A1 - Cano,Fernando Morales

A1 - Helveg,Stig

A1 - Lemus-Yegres,Lived J.

A1 - Grunwaldt,Jan-Dierk

AU - Boubnov,Alexey

AU - Dahl,Søren

AU - Johnson,Erik

AU - Molina,Anna Puig

AU - Simonsen,Søren Bredmose

AU - Cano,Fernando Morales

AU - Helveg,Stig

AU - Lemus-Yegres,Lived J.

AU - Grunwaldt,Jan-Dierk

PB - Elsevier BV

PY - 2012

Y1 - 2012

N2 - <p>Structure–performance relationships for Pt/Al<sub>2</sub>O<sub>3</sub> catalysts with mean Pt particle sizes of 1, 2, 3, 5 and 10nm are investigated for the catalytic oxidation of CO and NO under lean-burning diesel exhaust conditions. The most active catalysts for CO oxidation exhibit Pt particles of 2–3nm, having a large fraction of low-coordinated and reactive surface Pt atoms. Exploiting in situ XAFS, we find that a reversible Pt surface oxidation is connected to high CO conversion. NO oxidation is most efficient over the catalysts with the largest Pt particles mainly exhibiting surface Pt atoms on planar facets. An irreversible Pt oxide formation observed during NO oxidation is a possible deactivation route and we suggest that the most active sites for NO oxidation are the ones least prone to surface oxidation. When both CO and NO are present in the reaction mixture, activity is increased for both reactions, suggesting that CO oxidation actively regenerates the Pt surface for NO oxidation and vice versa. The effect is strongest for the NO oxidation activity.</p>

AB - <p>Structure–performance relationships for Pt/Al<sub>2</sub>O<sub>3</sub> catalysts with mean Pt particle sizes of 1, 2, 3, 5 and 10nm are investigated for the catalytic oxidation of CO and NO under lean-burning diesel exhaust conditions. The most active catalysts for CO oxidation exhibit Pt particles of 2–3nm, having a large fraction of low-coordinated and reactive surface Pt atoms. Exploiting in situ XAFS, we find that a reversible Pt surface oxidation is connected to high CO conversion. NO oxidation is most efficient over the catalysts with the largest Pt particles mainly exhibiting surface Pt atoms on planar facets. An irreversible Pt oxide formation observed during NO oxidation is a possible deactivation route and we suggest that the most active sites for NO oxidation are the ones least prone to surface oxidation. When both CO and NO are present in the reaction mixture, activity is increased for both reactions, suggesting that CO oxidation actively regenerates the Pt surface for NO oxidation and vice versa. The effect is strongest for the NO oxidation activity.</p>

KW - Platinum

KW - Alumina

KW - Particle size

KW - CO oxidation

KW - NO oxidation

KW - Lean burn

KW - Surface oxide

KW - TEM

KW - Chemisorption

KW - In situ XAFS

U2 - 10.1016/j.apcatb.2012.07.029

DO - 10.1016/j.apcatb.2012.07.029

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

SN - 0926-3373

VL - 126

SP - 315

EP - 325

ER -