Visualizing the mobility of silver during catalytic soot oxidation

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Abstract

The catalytic activity and mobility of silver nanoparticles used as catalysts in temperature programmed oxidation of soot:silver (1:5 wt:wt) mixtures have been investigated by means of flow reactor experiments and in situ environmental transmission electron microscopy (ETEM). The carbon oxidation temperature was significantly lower compared to uncatalyzed soot oxidation with soot and silver loosely stirred together (loose contact) and lowered further with the two components crushed together (tight contact). The in situ TEM investigations revealed that the silver particles exhibited significant mobility during the soot oxidation, and this mobility, which increases the soot/catalyst contact, is expected to be an important factor for the lower oxidation temperature. In the intimate tight contact mixture the initial dispersion of the silver particles is greater,,and the onset of mobility occurs at a lower temperature which is consistent with the lower oxidation temperature of the tight contact mixture. (C) 2015 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalApplied Catalysis B: Environmental
Volume183
Pages (from-to)28-36
ISSN0926-3373
DOIs
Publication statusPublished - 2016

Keywords

  • Silver mobility
  • Environmental TEM
  • Soot oxidation

Cite this

@article{139099884ad94a62b958ac85024d55fc,
title = "Visualizing the mobility of silver during catalytic soot oxidation",
abstract = "The catalytic activity and mobility of silver nanoparticles used as catalysts in temperature programmed oxidation of soot:silver (1:5 wt:wt) mixtures have been investigated by means of flow reactor experiments and in situ environmental transmission electron microscopy (ETEM). The carbon oxidation temperature was significantly lower compared to uncatalyzed soot oxidation with soot and silver loosely stirred together (loose contact) and lowered further with the two components crushed together (tight contact). The in situ TEM investigations revealed that the silver particles exhibited significant mobility during the soot oxidation, and this mobility, which increases the soot/catalyst contact, is expected to be an important factor for the lower oxidation temperature. In the intimate tight contact mixture the initial dispersion of the silver particles is greater,,and the onset of mobility occurs at a lower temperature which is consistent with the lower oxidation temperature of the tight contact mixture. (C) 2015 Elsevier B.V. All rights reserved.",
keywords = "Silver mobility, Environmental TEM, Soot oxidation",
author = "Diego Gardini and Christensen, {Jakob M.} and Damsgaard, {Christian Danvad} and Jensen, {Anker D.} and Wagner, {Jakob B.}",
year = "2016",
doi = "10.1016/j.apcatb.2015.10.029",
language = "English",
volume = "183",
pages = "28--36",
journal = "Applied Catalysis B: Environmental",
issn = "0926-3373",
publisher = "Elsevier",

}

Visualizing the mobility of silver during catalytic soot oxidation. / Gardini, Diego; Christensen, Jakob M.; Damsgaard, Christian Danvad; Jensen, Anker D.; Wagner, Jakob B.

In: Applied Catalysis B: Environmental, Vol. 183, 2016, p. 28-36.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Visualizing the mobility of silver during catalytic soot oxidation

AU - Gardini, Diego

AU - Christensen, Jakob M.

AU - Damsgaard, Christian Danvad

AU - Jensen, Anker D.

AU - Wagner, Jakob B.

PY - 2016

Y1 - 2016

N2 - The catalytic activity and mobility of silver nanoparticles used as catalysts in temperature programmed oxidation of soot:silver (1:5 wt:wt) mixtures have been investigated by means of flow reactor experiments and in situ environmental transmission electron microscopy (ETEM). The carbon oxidation temperature was significantly lower compared to uncatalyzed soot oxidation with soot and silver loosely stirred together (loose contact) and lowered further with the two components crushed together (tight contact). The in situ TEM investigations revealed that the silver particles exhibited significant mobility during the soot oxidation, and this mobility, which increases the soot/catalyst contact, is expected to be an important factor for the lower oxidation temperature. In the intimate tight contact mixture the initial dispersion of the silver particles is greater,,and the onset of mobility occurs at a lower temperature which is consistent with the lower oxidation temperature of the tight contact mixture. (C) 2015 Elsevier B.V. All rights reserved.

AB - The catalytic activity and mobility of silver nanoparticles used as catalysts in temperature programmed oxidation of soot:silver (1:5 wt:wt) mixtures have been investigated by means of flow reactor experiments and in situ environmental transmission electron microscopy (ETEM). The carbon oxidation temperature was significantly lower compared to uncatalyzed soot oxidation with soot and silver loosely stirred together (loose contact) and lowered further with the two components crushed together (tight contact). The in situ TEM investigations revealed that the silver particles exhibited significant mobility during the soot oxidation, and this mobility, which increases the soot/catalyst contact, is expected to be an important factor for the lower oxidation temperature. In the intimate tight contact mixture the initial dispersion of the silver particles is greater,,and the onset of mobility occurs at a lower temperature which is consistent with the lower oxidation temperature of the tight contact mixture. (C) 2015 Elsevier B.V. All rights reserved.

KW - Silver mobility

KW - Environmental TEM

KW - Soot oxidation

U2 - 10.1016/j.apcatb.2015.10.029

DO - 10.1016/j.apcatb.2015.10.029

M3 - Journal article

VL - 183

SP - 28

EP - 36

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

SN - 0926-3373

ER -