Catalytic diesel soot oxidation by hydrothermally stable glass catalysts

Zokoe, James; McGinn, Paul J.

doi:10.1016/j.cej.2014.09.075

Cited by 21 publications

(35 citation statements)

References 21 publications

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“…On the other hand, the loaded DPF can cause a backpressure potentially decreasing the engine efficiency. Hence, a regeneration step at above 600 • C is mandatory to thermally remove the soot deposits from the filter, while the diesel exhaust gas is typically at 180-400 • C [4,5].…”

Section: Introductionmentioning

confidence: 99%

Synergetic effects of plasma and metal oxide catalysts on diesel soot oxidation

Ranji‐Burachaloo

Masoomi‐Godarzi

Khodadadi

et al. 2016

Applied Catalysis B: Environmental

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Section: Introductionmentioning

confidence: 99%

Synergetic effects of plasma and metal oxide catalysts on diesel soot oxidation

Ranji‐Burachaloo

Masoomi‐Godarzi

Khodadadi

et al. 2016

Applied Catalysis B: Environmental

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“…Small additions of Zr to the KCS-1 glass composition could improve the chemical durability of a K-Ca-Si-O glass in a hydrothermal environment by strengthening the surface against restructuring. However, the Ca in the glass can still leach to the surface and lower the catalyst activity by forming inactive precipitates [31]. By replacing the Ca in the glass with Ce and a small amount of Zr, all three KCeSZ compositions provide nearly equivalent soot oxidation performance compared to the KCS-1 composition without the catalytically inactive Ca element.…”

Section: Catalytic Activity Characterization By Hr-tgamentioning

confidence: 99%

“…In an earlier study the degradation of a K-Ca-Si-O glass in a hydrothermal environment analogous to that encountered in diesel exhaust was documented [31]. In that work partial catalytic deactivation was determined to be caused by CaCO3 formation on the surface after prolonged exposure to humid gas.…”

Section: Introductionmentioning

confidence: 99%

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Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts

Zokoe

Feng

et al. 2019

Catalysts

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The hydrothermal stability of K-Ca-Si-O glass soot oxidation catalysts has been improved by substitution of Ce and Zr for Ca. This work demonstrates that glasses can be tailored to withstand the challenging diesel exhaust hydrothermal environment by considering the field strengths and partial molar free energies of the hydration reactions (ΔGi) of the cation species in the glass. The result is a glass that shows less formation of precipitates after 2 h hydrothermal exposure in air with 7% H2O at temperatures ranging from 300–700 °C. A K-Ca-Si-O glass with a soot T50 (the temperature when 50% of the soot is oxidized) of 394 °C was found to degrade to 468 °C after a 2 h, 700 °C hydrothermal exposure, whereas the improved K-Ce-Zr-Si-O glass only changed from 407 °C to 427 °C after the same treatment.

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“…This comparably realistic "loose" contact condition achieved by flame soot deposit (Flame Contact) was utilized in our previous work for performance studies [5,25,26], durability studies (e.g., Sulphur exposure, aging exposure etc.) [26,28], as well as extended continuous soot oxidation (ECSO) investigations [33]. Particularly, differing from the previous TGA cycling method, the ECSO unit was designed to accelerate the durability assessment of studied soot oxidation catalysts which enables exposing the catalyst for an extended period of time at a constant temperature and soot loading rate.…”

Section: Implications Of This Studymentioning

confidence: 99%

Simulating Real World Soot-Catalyst Contact Conditions for Lab-Scale Catalytic Soot Oxidation Studies

Wang

Kumar

et al. 2018

Catalysts

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In diesel soot oxidation studies, both well-defined model soot and a reliable means to simulate realistic contact conditions with catalysts are crucial. This study is the first attempt in the field to establish a lab-scale continuous flame soot deposition method in simulating the “contact condition” of soot and a structured diesel particulate filter (DPF) catalyst. The properties of this flame soot were examined by means of X-ray diffraction (XRD) and transmission electron microscopy (TEM) for structure analysis, Brunauer-Emmett-Teller (BET) for surface area analysis, and thermogravimetric analysis (TGA) for reactivity and kinetics analysis. For validation purposes, catalytic oxidation of Tiki® soot using the simulated contact condition was conducted to compare with the diesel particulates collected from a real diesel engine exhaust system. It was found that the flame soot is more uniform and controllable than similar samples of collected diesel particulates. The change in T50 due to the presence of the catalyst is very similar in both cases, implying that the flame deposit method is able to produce comparably realistic contact conditions to that resulting from the real exhaust system. Comparing against the expensive engine testing, this novel method allows researchers to quickly set up a procedure in the laboratory scale to reveal the catalytic soot oxidation properties in a comparable loose contact condition.

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Catalytic diesel soot oxidation by hydrothermally stable glass catalysts

Cited by 21 publications

References 21 publications

Synergetic effects of plasma and metal oxide catalysts on diesel soot oxidation

Synergetic effects of plasma and metal oxide catalysts on diesel soot oxidation

Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts

Simulating Real World Soot-Catalyst Contact Conditions for Lab-Scale Catalytic Soot Oxidation Studies

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