Investigations of soot combustion on yttria-stabilized zirconia by environmental transmission electron microscopy (ETEM)

Serve, A.; Épicier, Thierry; Aouine, M.; Aires, F.J. Cadete Santos; Obeid, Emil; Tsampas, Mihalis N.; Pajot, K.; Vernoux, P.

doi:10.1016/j.apcata.2015.02.030

Cited by 28 publications

(21 citation statements)

References 19 publications

(32 reference statements)

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“…The temperature of the sample was raised up to 550°C to investigate the reactivity of these big soot particles. From 500°C (Figure 2 (d-f) and video 3), soot grapes start to be slowly oxidized mainly at the contact points with CZ80 crystallites in good agreement with previous similar ETEM observations 11,12 . The soot oxidation rate at the catalyst interface is much higher at 550°C (video 3) in excellent agreement with TPO profiles (Figure 1) that show a maximum at 550°C.…”

supporting

confidence: 91%

In situ environmental HRTEM discloses low temperature carbon soot oxidation by ceria–zirconia at the nanoscale

et al. 2019

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supporting

confidence: 91%

In situ environmental HRTEM discloses low temperature carbon soot oxidation by ceria–zirconia at the nanoscale

et al. 2019

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“…Printex-U carbon black powder with an average particle size of 25 nm was used as a model of carbon nanoparticles, which is common for research on carbon PM oxidation 25,35–37 . The catalyst used was a 10% iron doped ceria catalyst (10%Fe/CeO 2 ) with a size around 20 nanometers after grinding for 10 minutes, synthesized by means of the solution combustion synthesis method 38 .…”

Section: Methodsmentioning

confidence: 99%

“…reported the similar motion of carbon black particles (around 10–20 nm) towards an aggregated catalyst cluster made of Ag/CeO 2 and Cu/BaO/La 2 O 3 cluster (around 200–300 nm) 5 . Others reported the motion of carbon particles of around 20 nm that were approaching an agglomerate of yttria-stabilized zirconia catalysts during the catalytic oxidation 35 . Interestingly there has been no report in the literature on observing the nano-sized ceria based catalyst moving towards the carbon particles, which could provide insight on particle-particle interaction and subsequently the reaction mechanism of catalyzed oxidation of particulate matters.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Observation of Carbon Oxidation by Driven Motion of Catalytic Ceria Nanoparticles within Low Pressure Oxygen

Sediako

Zhao

et al. 2019

Sci Rep

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Carbon particulate matter (PM) is an undesirable aerosol pollutant formed from combustors such as power plants, refineries, and engines. The most common and effective method of mitigating PM emission is the capture of particulates using a filter, before particles are released into the atmosphere. In order to develop and improve advanced filtering materials, a better understanding is required of their chemical and mechanical behavior. We report on a novel phenomenon on the mobility and oxidation behavior of catalytic iron doped ceria nanoparticles in contact with mobile carbon black nanoparticles. The process is recorded by real time imaging within an environmental transmission electron microscope. In contrast to observations in previous studies, the separated ceria nanoparticles are found to actively move on the substrate and consume the connecting carbon particles one-by-one. The velocity of particle motion is correlated to the reaction temperature and oxygen pressure, both determining the reaction rate. Modeling using the Density Functional Theory suggests this motion is driven by the chemical bonding between the surface oxygen of the catalyst and the graphite layers of carbon black, initiated through the Van der Waals force between two types of nanoparticles.

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“…On the other hand, E-TEM is also a powerful tool for direct observation in more applicativeinclined studies, devoted to test and observe the performance and limits of materials with more immediate practical repercussions. Such is the case of the study on yttria-stabilized zirconia (YSZ) NPs as a treatment device for soot exhaust products by their oxygen channeling capability [90]. In situ E-TEM experiments, conducted under high temperature conditions with a 3 mbar pressure of O 2 on a tight mix of YSZ and soot, offered direct evidence of the role of YSZ.…”

Section: The Differentially Pumped Systemmentioning

confidence: 99%

The New Youth of the In Situ Transmission Electron Microscopy

Casu¹,

Sogne²,

Genovese³

et al. 2016

Microscopy and Analysis

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The idea of iσ situ transmission electron microscopy TEM and its possible ramifications were proposed at the very dawn of electron microscopy, but the translation from theory to practice encountered many technological setbacks, which hindered the feasibility of the most elaborated approaches until recent times. However, the several technological improvements achieved in the last years filled this gap, allowing the direct observation of the dynamic response of materials to external stimuli under a vast range of conditions going from vacuum to gaseous or liquid environment. This resulted in a blossoming of the iσ situ TEM and scanning TEM STEM techniques to a new youth for a vast, growing range of applications, which cannot be rightfully detailed in a short span therefore, this chapter should be intended as a guide highlighting a selection of the most inspiring, recently achieved results.

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Investigations of soot combustion on yttria-stabilized zirconia by environmental transmission electron microscopy (ETEM)

Cited by 28 publications

References 19 publications

In situ environmental HRTEM discloses low temperature carbon soot oxidation by ceria–zirconia at the nanoscale

In situ environmental HRTEM discloses low temperature carbon soot oxidation by ceria–zirconia at the nanoscale

Real-Time Observation of Carbon Oxidation by Driven Motion of Catalytic Ceria Nanoparticles within Low Pressure Oxygen

The New Youth of the In Situ Transmission Electron Microscopy

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