NOx-assisted soot oxidation based on Ag/MnOx-CeO2 mixed oxides

Eun Jun Lee; Min June Kim; Jin Woo Choung; Chang Hwan Kim; Kwan Young Lee

doi:10.1016/j.apcata.2021.118396

NOx-assisted soot oxidation based on Ag/MnO_x-CeO₂ mixed oxides

Eun Jun Lee, Min June Kim, Jin Woo Choung, Chang Hwan Kim, Kwan Young Lee

Department of Chemical and Biological Engineering

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

8 Citations (Scopus)

Abstract

In previous studies, Ag/CeO₂ catalyst showed the high activity on NOx-free soot oxidation. For additional improvement of oxidation activity, Mn was introduced in Ag/CeO₂ and NOx-assisted soot oxidation was performed. NOx-assisted soot oxidation activities showed the large difference between the catalysts. Especially, Ag/2MnO_x-1CeO₂ catalysts showed remarkably improved T₂₀ at 349 °C compared with T₂₀ of Ag/CeO₂ at 464 °C (each T₅₀ is 391 °C and 400 °C, and each T_max is 514 °C and 509 °C). NO oxidation activity was increased as the mole ratio of Mn increased, while amount of NO adsorption was increased in Ag/MnO_x-CeO₂ mixed oxide compared to other catalysts. Especially, Ag/2MnO_x-1CeO₂ catalysts showed NO oxidation activity at low-temperature and NO desorption at appropriate temperature. As a result, it was confirmed that not only the NO oxidation activity but also the NOx adsorption characteristics are the most important factors in NOx-assisted soot oxidation. Accordingly, Ag/2MnO_x-1CeO₂ catalysts were proposed as optimal catalysts.

Original language	English
Article number	118396
Journal	Applied Catalysis A: General
Volume	627
DOIs	https://doi.org/10.1016/j.apcata.2021.118396
Publication status	Published - 2021 Oct 25

Keywords

Adsorbed NOx
Ag/MnO-CeO
NO oxidation
Soot oxidation

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

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10.1016/j.apcata.2021.118396

Cite this

@article{718fd6e974ee4908b5a37f6eff4b029b,

title = "NOx-assisted soot oxidation based on Ag/MnOx-CeO2 mixed oxides",

abstract = "In previous studies, Ag/CeO2 catalyst showed the high activity on NOx-free soot oxidation. For additional improvement of oxidation activity, Mn was introduced in Ag/CeO2 and NOx-assisted soot oxidation was performed. NOx-assisted soot oxidation activities showed the large difference between the catalysts. Especially, Ag/2MnOx-1CeO2 catalysts showed remarkably improved T20 at 349 °C compared with T20 of Ag/CeO2 at 464 °C (each T50 is 391 °C and 400 °C, and each Tmax is 514 °C and 509 °C). NO oxidation activity was increased as the mole ratio of Mn increased, while amount of NO adsorption was increased in Ag/MnOx-CeO2 mixed oxide compared to other catalysts. Especially, Ag/2MnOx-1CeO2 catalysts showed NO oxidation activity at low-temperature and NO desorption at appropriate temperature. As a result, it was confirmed that not only the NO oxidation activity but also the NOx adsorption characteristics are the most important factors in NOx-assisted soot oxidation. Accordingly, Ag/2MnOx-1CeO2 catalysts were proposed as optimal catalysts.",

keywords = "Adsorbed NOx, Ag/MnO-CeO, NO oxidation, Soot oxidation",

author = "Lee, {Eun Jun} and Kim, {Min June} and Choung, {Jin Woo} and Kim, {Chang Hwan} and Lee, {Kwan Young}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) ( NRF-2016R1A5A1009592 ). Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = oct,

day = "25",

doi = "10.1016/j.apcata.2021.118396",

language = "English",

volume = "627",

journal = "Applied Catalysis A: General",

issn = "0926-860X",

publisher = "Elsevier",

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TY - JOUR

T1 - NOx-assisted soot oxidation based on Ag/MnOx-CeO2 mixed oxides

AU - Lee, Eun Jun

AU - Kim, Min June

AU - Choung, Jin Woo

AU - Kim, Chang Hwan

AU - Lee, Kwan Young

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) ( NRF-2016R1A5A1009592 ). Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/10/25

Y1 - 2021/10/25

N2 - In previous studies, Ag/CeO2 catalyst showed the high activity on NOx-free soot oxidation. For additional improvement of oxidation activity, Mn was introduced in Ag/CeO2 and NOx-assisted soot oxidation was performed. NOx-assisted soot oxidation activities showed the large difference between the catalysts. Especially, Ag/2MnOx-1CeO2 catalysts showed remarkably improved T20 at 349 °C compared with T20 of Ag/CeO2 at 464 °C (each T50 is 391 °C and 400 °C, and each Tmax is 514 °C and 509 °C). NO oxidation activity was increased as the mole ratio of Mn increased, while amount of NO adsorption was increased in Ag/MnOx-CeO2 mixed oxide compared to other catalysts. Especially, Ag/2MnOx-1CeO2 catalysts showed NO oxidation activity at low-temperature and NO desorption at appropriate temperature. As a result, it was confirmed that not only the NO oxidation activity but also the NOx adsorption characteristics are the most important factors in NOx-assisted soot oxidation. Accordingly, Ag/2MnOx-1CeO2 catalysts were proposed as optimal catalysts.

AB - In previous studies, Ag/CeO2 catalyst showed the high activity on NOx-free soot oxidation. For additional improvement of oxidation activity, Mn was introduced in Ag/CeO2 and NOx-assisted soot oxidation was performed. NOx-assisted soot oxidation activities showed the large difference between the catalysts. Especially, Ag/2MnOx-1CeO2 catalysts showed remarkably improved T20 at 349 °C compared with T20 of Ag/CeO2 at 464 °C (each T50 is 391 °C and 400 °C, and each Tmax is 514 °C and 509 °C). NO oxidation activity was increased as the mole ratio of Mn increased, while amount of NO adsorption was increased in Ag/MnOx-CeO2 mixed oxide compared to other catalysts. Especially, Ag/2MnOx-1CeO2 catalysts showed NO oxidation activity at low-temperature and NO desorption at appropriate temperature. As a result, it was confirmed that not only the NO oxidation activity but also the NOx adsorption characteristics are the most important factors in NOx-assisted soot oxidation. Accordingly, Ag/2MnOx-1CeO2 catalysts were proposed as optimal catalysts.

KW - Adsorbed NOx

KW - Ag/MnO-CeO

KW - NO oxidation

KW - Soot oxidation

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