Evaluation of Mn and Sn-Modified Pd-Ce-Based Catalysts for Low-Temperature Diesel Exhaust Oxidation

Chao Wang; Andrew J. Binder; Todd J. Toops; Jochen Lauterbach; Erdem Sasmaz

doi:10.1007/s40825-016-0056-9

Evaluation of Mn and Sn-Modified Pd-Ce-Based Catalysts for Low-Temperature Diesel Exhaust Oxidation

Chao Wang, Andrew J. Binder, Todd J. Toops, Jochen Lauterbach, Erdem Sasmaz

Applied Catalysis&Emissions Res. Group

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

10 Scopus citations

Abstract

Pd-impregnated Ce-based catalysts were tested for carbon monoxide (CO) and hydrocarbon (HC) oxidation under challenging low-temperature diesel combustion conditions. The results indicate that the light-off temperatures for CO over Pd/CeO₂, Pd/MnO_x-CeO₂ (Pd/MC), and Pd/SnO₂-MnO_x-CeO₂ (Pd/SMC) catalysts shift to higher temperatures in the presence of simulated diesel exhaust gas. The lowest T₅₀ for CO is observed over Pd/MC at 173 °C, whereas Pd/CeO₂ is shown to oxidize most of the HCs at temperatures below 400 °C. In all catalysts, the oxidation of HCs starts right after the onset of CO oxidation, revealing that the competitive adsorption of CO, NO, and alkenes controls the catalytic activity. Further evaluation of the catalytic activity in the presence of only CO and C₃H₆ reveals the immediate inhibiting effect of C₃H₆ at catalyst temperatures below 150 °C. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments performed over Pd/CeO₂, Pd/MC, and Pd/SMC show that C₃H₆ inhibits the formation of carbonyl species on Pdⁿ⁺ sites, which limits the catalytic activity for CO. Such inhibition is observed on all supports, implying that the activity is independent of oxygen storage capacity (OSC) or lattice oxygen reducibility of the supports in the presence of C₃H₆.

Original language	English
Pages (from-to)	37-46
Number of pages	10
Journal	Emission Control Science and Technology
Volume	3
Issue number	1
DOIs	https://doi.org/10.1007/s40825-016-0056-9
State	Published - Mar 1 2017

Funding

This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the US Department of Energy. The US Government retains and the publisher, by accepting the article for publication, acknowledges that the US Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

Funders	Funder number
South Carolina Smartstate Center for Strategic Approaches
US Department of Energy
UT-Battelle, LLC
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
University of South Carolina

Keywords

Hydrocarbon inhibition
Low-temperature diesel oxidation
Pd
Solid solution

Access to Document

10.1007/s40825-016-0056-9

Cite this

@article{1b8c8c6bfb8a455b9ab3a2e68b72b971,

title = "Evaluation of Mn and Sn-Modified Pd-Ce-Based Catalysts for Low-Temperature Diesel Exhaust Oxidation",

abstract = "Pd-impregnated Ce-based catalysts were tested for carbon monoxide (CO) and hydrocarbon (HC) oxidation under challenging low-temperature diesel combustion conditions. The results indicate that the light-off temperatures for CO over Pd/CeO2, Pd/MnOx-CeO2 (Pd/MC), and Pd/SnO2-MnOx-CeO2 (Pd/SMC) catalysts shift to higher temperatures in the presence of simulated diesel exhaust gas. The lowest T50 for CO is observed over Pd/MC at 173 °C, whereas Pd/CeO2 is shown to oxidize most of the HCs at temperatures below 400 °C. In all catalysts, the oxidation of HCs starts right after the onset of CO oxidation, revealing that the competitive adsorption of CO, NO, and alkenes controls the catalytic activity. Further evaluation of the catalytic activity in the presence of only CO and C3H6 reveals the immediate inhibiting effect of C3H6 at catalyst temperatures below 150 °C. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments performed over Pd/CeO2, Pd/MC, and Pd/SMC show that C3H6 inhibits the formation of carbonyl species on Pdn+ sites, which limits the catalytic activity for CO. Such inhibition is observed on all supports, implying that the activity is independent of oxygen storage capacity (OSC) or lattice oxygen reducibility of the supports in the presence of C3H6.",

keywords = "Hydrocarbon inhibition, Low-temperature diesel oxidation, Pd, Solid solution",

author = "Chao Wang and Binder, {Andrew J.} and Toops, {Todd J.} and Jochen Lauterbach and Erdem Sasmaz",

note = "Publisher Copyright: {\textcopyright} 2016, Springer International Publishing Switzerland.",

year = "2017",

month = mar,

day = "1",

doi = "10.1007/s40825-016-0056-9",

language = "English",

volume = "3",

pages = "37--46",

journal = "Emission Control Science and Technology",

issn = "2199-3629",

publisher = "Springer",

number = "1",

}

TY - JOUR

T1 - Evaluation of Mn and Sn-Modified Pd-Ce-Based Catalysts for Low-Temperature Diesel Exhaust Oxidation

AU - Wang, Chao

AU - Binder, Andrew J.

AU - Toops, Todd J.

AU - Lauterbach, Jochen

AU - Sasmaz, Erdem

PY - 2017/3/1

Y1 - 2017/3/1

N2 - Pd-impregnated Ce-based catalysts were tested for carbon monoxide (CO) and hydrocarbon (HC) oxidation under challenging low-temperature diesel combustion conditions. The results indicate that the light-off temperatures for CO over Pd/CeO2, Pd/MnOx-CeO2 (Pd/MC), and Pd/SnO2-MnOx-CeO2 (Pd/SMC) catalysts shift to higher temperatures in the presence of simulated diesel exhaust gas. The lowest T50 for CO is observed over Pd/MC at 173 °C, whereas Pd/CeO2 is shown to oxidize most of the HCs at temperatures below 400 °C. In all catalysts, the oxidation of HCs starts right after the onset of CO oxidation, revealing that the competitive adsorption of CO, NO, and alkenes controls the catalytic activity. Further evaluation of the catalytic activity in the presence of only CO and C3H6 reveals the immediate inhibiting effect of C3H6 at catalyst temperatures below 150 °C. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments performed over Pd/CeO2, Pd/MC, and Pd/SMC show that C3H6 inhibits the formation of carbonyl species on Pdn+ sites, which limits the catalytic activity for CO. Such inhibition is observed on all supports, implying that the activity is independent of oxygen storage capacity (OSC) or lattice oxygen reducibility of the supports in the presence of C3H6.

AB - Pd-impregnated Ce-based catalysts were tested for carbon monoxide (CO) and hydrocarbon (HC) oxidation under challenging low-temperature diesel combustion conditions. The results indicate that the light-off temperatures for CO over Pd/CeO2, Pd/MnOx-CeO2 (Pd/MC), and Pd/SnO2-MnOx-CeO2 (Pd/SMC) catalysts shift to higher temperatures in the presence of simulated diesel exhaust gas. The lowest T50 for CO is observed over Pd/MC at 173 °C, whereas Pd/CeO2 is shown to oxidize most of the HCs at temperatures below 400 °C. In all catalysts, the oxidation of HCs starts right after the onset of CO oxidation, revealing that the competitive adsorption of CO, NO, and alkenes controls the catalytic activity. Further evaluation of the catalytic activity in the presence of only CO and C3H6 reveals the immediate inhibiting effect of C3H6 at catalyst temperatures below 150 °C. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments performed over Pd/CeO2, Pd/MC, and Pd/SMC show that C3H6 inhibits the formation of carbonyl species on Pdn+ sites, which limits the catalytic activity for CO. Such inhibition is observed on all supports, implying that the activity is independent of oxygen storage capacity (OSC) or lattice oxygen reducibility of the supports in the presence of C3H6.

KW - Hydrocarbon inhibition

KW - Low-temperature diesel oxidation

KW - Pd

KW - Solid solution

UR - http://www.scopus.com/inward/record.url?scp=85021651675&partnerID=8YFLogxK

U2 - 10.1007/s40825-016-0056-9

DO - 10.1007/s40825-016-0056-9

M3 - Article

AN - SCOPUS:85021651675

SN - 2199-3629

VL - 3

SP - 37

EP - 46

JO - Emission Control Science and Technology

JF - Emission Control Science and Technology

IS - 1

ER -

Evaluation of Mn and Sn-Modified Pd-Ce-Based Catalysts for Low-Temperature Diesel Exhaust Oxidation

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this