Ozone activated Ag/CeO2 catalysts for soot combustion: The surface and structural influences

Zhang, Meisheng; Jin, Baofang; Liu, Yan; Liu, Wei; Weng, Duan; Wu, Xiaodong; Liu, Shuang

doi:10.1016/j.cej.2019.121961

Cited by 36 publications

(14 citation statements)

References 46 publications

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“…However, the relationship between the crystal facets of catalysts and the catalytic performances for soot combustion is still unknown. The exposed facets of CeO 2 can tune the physicochemical properties of supported metal NPs, which results in the enhanced activity, selectivity, and stability. − The various nanoshapes (rod, cube, and polyhedron) of CeO 2 with exposed facets of {110}, {100}, and {111} have the potential to investigate the crystal facet-dependent activity of supported Au catalysts for soot combustion . Thus, the fabrication of Au NPs on CeO 2 oxides with optimal surface facets is not only an efficient strategy to boost the catalytic purification of soot particles but also offers one way to investigate the relationship between surface crystal facets of supports and catalytic activity. − …”

Section: Introductionmentioning

confidence: 99%

Boosting the Removal of Diesel Soot Particles by the Optimal Exposed Crystal Facet of CeO₂ in Au/CeO₂ Catalysts

Wei

Zhang

et al. 2019

Environ. Sci. Technol.

126

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Optimized surface facet of the catalysts is an efficient strategy to boost catalytic purification of diesel soot as important components of atmospheric fine particles. Herein, we have elaborately constructed the nanocatalysts of Au nanoparticles supported on the well-defined CeO 2 (rod, cube, and polyhedron) with predominantly exposed facets of {110}, {100}, and {111}, respectively. The strong interaction between Au and CeO 2 with the optimal crystal facet is crucial to adjust the active site density for activated O 2 , and the synergy effect of Au and the CeO 2 {110} facet possesses the largest density of active sites compared with other crystal facets of {100} and {111}. The catalytic activity for soot combustion was tuned by exposed crystal facets of CeO 2 . The Au/CeO 2 -rod catalyst exhibits the highest catalytic activity (T 50 = 350 °C, TOF = 0.18 h −1 ) and the lowest apparent activation energy (72 kJ mol −1 ) during soot combustion. Based on the results of in situ Raman spectra, the formation and stability of oxygen vacancy located at the interface of the Au−O−Ce bond, boosting the key step of NO oxidation to NO 2 , are dependent on the exposed crystal facets of CeO 2 . It highlights a new strategy for the fabrication of high-efficient CeO 2 -based catalysts for the removal of soot particles or other pollution.

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Section: Introductionmentioning

confidence: 99%

Boosting the Removal of Diesel Soot Particles by the Optimal Exposed Crystal Facet of CeO₂ in Au/CeO₂ Catalysts

Wei

Zhang

et al. 2019

Environ. Sci. Technol.

126

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“…Figure a depicts the O 1s XPS spectra of the MnCo 2 O 4 and M 0.1 Mn 0.9 Co 2 O 4 (M= Sm, Ce, or La) catalysts. The O 1s XPS spectra of the samples could be fitted into two components corresponding to the surface-adsorbed oxygen (O α ) at 531.2 eV and the lattice oxygen (O β ) at 530 eV. ,, The molar ratios of O α /(O α + O β ) on the surface of different samples varied in the order of Sm 0.1 Mn 0.9 Co 2 O 4 (51.94%) > La 0.1 MnCo 2 O 4 (48.86%) > Ce 0.1 MnCo 2 O 4 (44.76%) > MnCo 2 O 4 (41.27%), which is consistent with the sequence of activity. Combined with the H 2 -TPR and O 2 -TPD results, it could be concluded that the surface-adsorbed oxygen species were enriched after doping.…”

Section: Resultsmentioning

confidence: 99%

Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo₂O₄ Spinel Catalysts

Zhang

Shan

et al. 2021

J. Phys. Chem. C

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“…Compared to the 10%Ag/AlOOH-900 catalyst, 10%Ag/nano-Al 2 O 3 had less oxidized Ag and a lower reduction temperature. The AgO x species on 10%Ag/nano-Al 2 O 3 were not detected by XRD or HRTEM, possibly due to their highly dispersed or ultrathin amorphous outer layers over the surface of silver nanoparticles, and they did not form AgO x particles like that on 10%Ag/AlOOH-900. , …”

Section: Resultsmentioning

confidence: 99%

Terminal Hydroxyl Groups on Al₂O₃ Supports Influence the Valence State and Dispersity of Ag Nanoparticles: Implications for Ozone Decomposition

Shao

et al. 2021

ACS Omega

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Ozone is a poisonous gas, so it is necessary to remove excessive ozone in the environment. Catalytic decomposition is an effective way to remove ozone at room temperature. In this work, 10%Ag/nano-Al 2 O 3 and 10%Ag/AlOOH-900 catalysts were synthesized by the impregnation method. The 10%Ag/nano-Al 2 O 3 catalyst showed 89% ozone conversion for 40 ppm O 3 for 6 h under a space velocity of 840 000 h –1 and a relative humidity of 65%, which is superior to 10%Ag/AlOOH-900 (45% conversion). The characterization results showed Ag nanoparticles to be the active sites for ozone decomposition, which were more highly dispersed on nano-Al 2 O 3 as a result of the greater density of terminal hydroxyl groups. The understanding of the dispersion and valence of silver species gained in this study will be beneficial to the design of more efficient supported silver catalysts for ozone decomposition in the future.

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Ozone activated Ag/CeO2 catalysts for soot combustion: The surface and structural influences

Cited by 36 publications

References 46 publications

Boosting the Removal of Diesel Soot Particles by the Optimal Exposed Crystal Facet of CeO₂ in Au/CeO₂ Catalysts

Boosting the Removal of Diesel Soot Particles by the Optimal Exposed Crystal Facet of CeO₂ in Au/CeO₂ Catalysts

Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo₂O₄ Spinel Catalysts

Terminal Hydroxyl Groups on Al₂O₃ Supports Influence the Valence State and Dispersity of Ag Nanoparticles: Implications for Ozone Decomposition

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Ozone activated Ag/CeO2 catalysts for soot combustion: The surface and structural influences

Cited by 36 publications

References 46 publications

Boosting the Removal of Diesel Soot Particles by the Optimal Exposed Crystal Facet of CeO2 in Au/CeO2 Catalysts

Boosting the Removal of Diesel Soot Particles by the Optimal Exposed Crystal Facet of CeO2 in Au/CeO2 Catalysts

Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo2O4 Spinel Catalysts

Terminal Hydroxyl Groups on Al2O3 Supports Influence the Valence State and Dispersity of Ag Nanoparticles: Implications for Ozone Decomposition

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Boosting the Removal of Diesel Soot Particles by the Optimal Exposed Crystal Facet of CeO₂ in Au/CeO₂ Catalysts

Boosting the Removal of Diesel Soot Particles by the Optimal Exposed Crystal Facet of CeO₂ in Au/CeO₂ Catalysts

Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo₂O₄ Spinel Catalysts

Terminal Hydroxyl Groups on Al₂O₃ Supports Influence the Valence State and Dispersity of Ag Nanoparticles: Implications for Ozone Decomposition