Promoting effect of Rh-impregnation on Ag/CeO2 catalyst for soot oxidation

Lee, Jae‐Hwan; Kim, Min June; Lee, Eun Jun; Lee, Dae Won; Kim, Chang Hwan; Lee, Kwan Young

doi:10.1016/j.apsusc.2021.151504

Cited by 21 publications

(5 citation statements)

References 36 publications

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“…The increase in mesopores originates from the voids formed between Ce–Zr solid solution nanoparticles, while the increase in ordered macropores is due to the pore structures left by the decomposition of PS spheres. It can directly promote the migration of soot particles into inner macropores (promote mass transport and reduce diffusion resistance), while mesopores limit the transfer of soot particles, thus enhancing the contact efficiency between the soot particles and the catalyst for efficient soot oxidation. , As demonstrated above, an orderly macroporous Ce 0.8 Zr 0.2 O 2 (OM CZO) catalyst integrated on a CDPF wall was successfully constructed.…”

Section: Resultsmentioning

confidence: 99%

“…It can directly promote the migration of soot particles into inner macropores (promote mass transport and reduce diffusion resistance), while mesopores limit the transfer of soot particles, thus enhancing the contact efficiency between the soot particles and the catalyst for efficient soot oxidation. 28,29 As demonstrated above, an orderly macroporous Ce 0.8 Zr 0.2 O 2 (OM CZO) catalyst integrated on a CDPF wall was successfully constructed.…”

Section: Fabrication Of the V O -Om Czo Integrated Cdfmentioning

confidence: 95%

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Highly Reactive Peroxide Species Promoted Soot Oxidation over an Ordered Macroporous Ce_0.8Zr_0.2O₂ Integrated Catalyzed Diesel Particulate Filter

Xiong,

Zhang,

Liang

et al. 2024

Environ. Sci. Technol.

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Particulate matter, represented by soot particles, poses a significant global environmental threat, necessitating efficient control technology. Here, we innovatively designed and elaborately fabricated ordered hierarchical macroporous catalysts of Ce 0.8 Zr 0.2 O 2 (OM CZO) integrated on a catalyzed diesel particulate filter (CDPF) using the self-assembly method. An oxygen-vacancy-enriched ordered macroporous Ce 0.8 Zr 0.2 O 2 catalyst (V O -OM CZO) integrated CDPF was synthesized by subsequent NaBH 4 reduction. The V O -OM CZO integrated CDPF exhibited a markedly enhanced soot oxidation activity compared to OM CZO and powder CZO coated CDPFs (T 50 : 430 vs 490 and 545 °C, respectively). The well-defined OM structure of the V O -OM CZO catalysts effectively improves the contact efficiency between soot and the catalysts. Meanwhile, oxygen vacancies trigger the formation of a large amount of highly reactive peroxide species (O 2 2− ) from molecular oxygen (O 2 ) through electron abstraction from the three adjacent Ce 3+ (3Ce 3+ + Vö+ O 2 → 3Ce 4+ + O 2 2− ), contributing to the efficient soot oxidation. This work demonstrates the fabrication of the ordered macroporous CZO integrated CDPF and reveals the importance of structure and surface engineering in soot oxidation, which sheds light on the design of highly efficient PM capture and removal devices.

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Section: Resultsmentioning

confidence: 99%

Section: Fabrication Of the V O -Om Czo Integrated Cdfmentioning

confidence: 95%

Highly Reactive Peroxide Species Promoted Soot Oxidation over an Ordered Macroporous Ce_0.8Zr_0.2O₂ Integrated Catalyzed Diesel Particulate Filter

Xiong,

Zhang,

Liang

et al. 2024

Environ. Sci. Technol.

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“…The higher activities of Rh/CeO 2 and Ag/CeO 2 were ascribed to enhanced oxygen vacancy formation, oxygen adsorption, and electron transfer. Subsequently, the same group 185 also prepared a Rh–Ag/CeO 2 catalyst with a rhodium loading of 2 wt% and a silver loading of 5 wt%. The interaction between rhodium and silver led to an increase in the Ag + /Ag 0 ratio and a decrease in the Rh 3+ /Rh 0 ratio, which avoided the reduction of the oxygen species on the catalyst surface.…”

Section: Application Of Cerium-based Oxide Catalysts To Catalytic Eli...mentioning

confidence: 99%

Construction of cerium-based oxide catalysts with abundant defects/vacancies and their application to catalytic elimination of air pollutants

Gao,

Yu,

Zhou

et al. 2023

J. Mater. Chem. A

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“…Soot catalysts mainly include precious metal catalysts, alkali metal catalysts, and transition-metal oxide catalysts . The active components of precious metals mainly include Pt, − Pd, Rh, etc. And they are loaded on metal oxide supports such as aluminum to form commonly used supported-type precious metal catalysts.…”

Section: Introductionmentioning

confidence: 99%

Study on the Catalytic Characteristics of Precious Metal Catalysts with Different Pt/Pd Ratios for Soot Combustion

et al. 2023

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Soot particles in engine exhaust seriously pollute the atmosphere and endanger human health. For soot oxidation, Pt and Pd precious metal catalysts are widely used and are effective. In this paper, the catalytic characteristics of catalysts with different Pt/Pd mass ratios for soot combustion were studied through X-ray diffraction, X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller analysis, scanning electron microscopy, transmission electron microscopy, the temperature-programmed oxidation reaction, and thermogravimetry. Besides, the adsorption characteristics of soot and O2 on the catalyst surface were explored by density functional theory (DFT) calculations. The research results showed that the activity of catalysts for soot oxidation from strong to weak is Pt/Pd = 10:1, Pt/Pd = 5:1, Pt/Pd = 1:0, and Pt/Pd = 1:1. XPS results showed that the concentration of oxygen vacancies in the catalyst is the highest when the Pt/Pd ratio is 10:1. The specific surface area of the catalyst increases first and then decreases with the increase of Pd content. When the Pt/Pd ratio is 10:1, the specific surface area and pore volume of the catalyst reach the maximum. The following are the DFT calculation results. With the increase of Pd content, the adsorption energy of particles on the catalyst surface decreases first and then increases. When the Pt/Pd ratio is 10:1, the adsorption of C on the catalyst surface is the strongest, and the adsorption of O2 is also strong. In addition, this surface has a strong ability to donate electrons. The theoretical simulation results are consistent with the activity test results. The research results have a guiding significance for optimizing the Pt/Pd ratio and improving the soot oxidation performance of the catalyst.

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Promoting effect of Rh-impregnation on Ag/CeO2 catalyst for soot oxidation

Cited by 21 publications

References 36 publications

Highly Reactive Peroxide Species Promoted Soot Oxidation over an Ordered Macroporous Ce_0.8Zr_0.2O₂ Integrated Catalyzed Diesel Particulate Filter

Highly Reactive Peroxide Species Promoted Soot Oxidation over an Ordered Macroporous Ce_0.8Zr_0.2O₂ Integrated Catalyzed Diesel Particulate Filter

Construction of cerium-based oxide catalysts with abundant defects/vacancies and their application to catalytic elimination of air pollutants

Study on the Catalytic Characteristics of Precious Metal Catalysts with Different Pt/Pd Ratios for Soot Combustion

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Promoting effect of Rh-impregnation on Ag/CeO2 catalyst for soot oxidation

Cited by 21 publications

References 36 publications

Highly Reactive Peroxide Species Promoted Soot Oxidation over an Ordered Macroporous Ce0.8Zr0.2O2 Integrated Catalyzed Diesel Particulate Filter

Highly Reactive Peroxide Species Promoted Soot Oxidation over an Ordered Macroporous Ce0.8Zr0.2O2 Integrated Catalyzed Diesel Particulate Filter

Construction of cerium-based oxide catalysts with abundant defects/vacancies and their application to catalytic elimination of air pollutants

Study on the Catalytic Characteristics of Precious Metal Catalysts with Different Pt/Pd Ratios for Soot Combustion

Contact Info

Product

Resources

About

Highly Reactive Peroxide Species Promoted Soot Oxidation over an Ordered Macroporous Ce_0.8Zr_0.2O₂ Integrated Catalyzed Diesel Particulate Filter

Highly Reactive Peroxide Species Promoted Soot Oxidation over an Ordered Macroporous Ce_0.8Zr_0.2O₂ Integrated Catalyzed Diesel Particulate Filter