Mass transfer towards a reactive particle in a fluid flow: Numerical simulations and modeling

Sulaiman, Mostafa; Climent, Éric; Hammouti, Abdelkader; Wachs, Anthony

doi:10.1016/j.ces.2018.12.051

Cited by 14 publications

(6 citation statements)

References 28 publications

(27 reference statements)

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“…The dotted line in Figure 5b depicts a simulated concentration overpotential curve corresponding to the expected HOR behaviour of a catalyst whose reaction rate constant is much larger than the mass transfer coefficient (i.e., external mass transfer controlled). [44][45][46] Notably, the predicted external mass transfer limited current density-which is described by the Levich equation and does not depend on the catalyst composition-was 2.6 mA/cm 2 at 1600 rpm in 0.1 M KOH, in close agreement with the data collected for a Pt/C catalyst. The fact that Ni-Mo/oC catalysts did not reach 2.6 mA/cm 2 suggests that a different type of mass transfer limitation may negatively impact the observed activity.…”

Section: (B)supporting

confidence: 82%

Reversible Alkaline Hydrogen Evolution and Oxidation Reactions Using Ni–Mo Catalysts Supported on Carbon

Patil

Kaur

House

et al. 2022

Preprint

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Unitized regenerative fuel cells based on hydroxide exchange membranes are attractive for long duration energy storage. This mode of operation depends on the ability to catalyze hydrogen evolution and oxidation reversibly, and ideally using nonprecious catalyst materials. Here we report the synthesis of Ni–Mo catalyst composites supported on oxidized Vulcan carbon (Ni–Mo/oC) and demonstrate their performance for reversible hydrogen evolution and oxidation. For the hydrogen evolution reaction, we observed mass-specific activities exceeding 80 mA/mg at 100 mV overpotential, and additional measurements using hydroxide exchange membrane electrode assemblies yielded full cell voltages that were only ~100 mV larger for Ni–Mo/oC cathodes compared to Pt–Ru/C at current densities exceeding 1 A/cm2. For hydrogen oxidation, Ni–Mo/oC films required <50 mV overpotential to achieve half the maximum anodic current density, but activity was limited by internal mass transfer and oxidative instability. Nonetheless, estimates of the mass-specific exchange current for Ni–Mo/oC from micropolarization measurements showed its hydrogen evolution/oxidation activity is within 1 order of magnitude of commercial Pt/C. Density functional theory calculations helped shed light on the high activity of Ni–Mo composites, where the addition of Mo leads to surface sites with weaker H-binding energies than pure Ni. These calculations further suggest that increasing the Mo content in the subsurface of the catalyst would result in still higher activity, but oxidative instability remains a significant impediment to high performance for hydrogen oxidation.

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Section: (B)supporting

confidence: 82%

Reversible Alkaline Hydrogen Evolution and Oxidation Reactions Using Ni–Mo Catalysts Supported on Carbon

Patil

Kaur

House

et al. 2022

Preprint

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“…Sh is the mass transfer coefficient. 59,60 Like many other fluid mechanic parameters, it is possible to avoid complex computation thanks to an approximating formula. 61 Losses due to impaction and inertia forces.…”

Section: Sampling Efficiencymentioning

confidence: 99%

Representativeness of airborne brake wear emission for the automotive industry: A review

Philippe

Morgeneyer

Xiang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Brake wear gives 16%–55% by mass to total non-exhaust traffic related PM10 emissions in urban environments. While engines have become cleaner in the past decades, few improvements were made to lower non-exhaust emission until recently. Researchers have developed several experimental methods over the past years to assess brake emissions. However, observations tend to differ from a method to another with respect to many disciplines, ranging from particle system characterization to brake cycles, and it remains difficult to compare results of different research groups. It is so crucial to get a consensus on the standard experimental method. The following article lists limits which influence measurements and has to be taken into account when comparing works from different laboratories. This article also discusses how to design tests to get a relevant braking particle system characterization.

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“…The present study is a part of a series of consecutive compu tational studies of reactive particulate flows. We investigated the problem of a single fixed particle where we used a boundary fitted method in Sulaiman et al (2018), now examine in this paper the problem of multiple aligned particles with a non boundary fitted method, and then will use this non boundary fitted method in future works to examine a random array of fixed particles and freely moving particles in a fluidized bed. The 3D simulation results supplied by this computational method in a flow configura tion representative of dilute particle laden flows are used to assess the validity of a reactive Sherwood number correlation that we already suggested for the case of a single sphere in an unbounded domain in Sulaiman et al 2018and that we revisit later in this work.…”

Section: Introductionmentioning

confidence: 99%

“…Then, any appropriate empirical correlation available in the literature for Sh can be used. For instance in (Sulaiman et al, 2018), we used for a single sphere the correlation defined by Feng and Michaelides (2000):…”

mentioning

confidence: 99%

Coupling the fictitious domain and sharp interface methods for the simulation of convective mass transfer around reactive particles: Towards a reactive Sherwood number correlation for dilute systems

Sulaiman

Hammouti

Climent

et al. 2019

Chemical Engineering Science

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Mass transfer towards a reactive particle in a fluid flow: Numerical simulations and modeling

Cited by 14 publications

References 28 publications

Reversible Alkaline Hydrogen Evolution and Oxidation Reactions Using Ni–Mo Catalysts Supported on Carbon

Reversible Alkaline Hydrogen Evolution and Oxidation Reactions Using Ni–Mo Catalysts Supported on Carbon

Representativeness of airborne brake wear emission for the automotive industry: A review

Coupling the fictitious domain and sharp interface methods for the simulation of convective mass transfer around reactive particles: Towards a reactive Sherwood number correlation for dilute systems

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