Introduce oxygen vacancies into CeO2 catalyst for enhanced coke resistance during photothermocatalytic oxidation of typical VOCs

Kong, Jiejing; Xiang, Zhongzheng; Li, Guiying; An, Taicheng

doi:10.1016/j.apcatb.2020.118755

Cited by 239 publications

(94 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…the high reactivity of its oxygens was strictly connected with its redox properties: the Ce 4+ → Ce 3+ reduction releases oxygens (that will oxidize the VOC) with a consequent formation of oxygen vacancies in the ceria lattice. These vacancies will be successively filled by oxygens in the gas phase, thus exploiting the redox properties of cerium oxide [23,72] (Figure 11a). In the photocatalytic oxidation of VOCs with semiconductor catalysts.…”

Section: Photothermo-catalytic Mechanismsmentioning

confidence: 99%

Exploring the Photothermo-Catalytic Performance of Brookite TiO2-CeO2 Composites

et al. 2020

View full text Add to dashboard Cite

The thermocatalytic, photocatalytic and photothermo-catalytic oxidation of some volatile organic compounds (VOCs), 2-propanol, ethanol and toluene, was investigated over brookite TiO2-CeO2 composites. The multi-catalytic approach based on the synergistic effect between solar photocatalysis and thermocatalysis led to the considerable decrease in the conversion temperatures of the organic compounds. In particular, in the photothermo-catalytic runs, for the most active samples (TiO2-3 wt% CeO2 and TiO2-5 wt% CeO2), the temperature at which 90% of VOC conversion occurred was about 60 °C, 40 °C and 20 °C lower than in the thermocatalytic tests for 2-propanol, ethanol and toluene, respectively. Furthermore, the addition of cerium oxide to brookite TiO2 favored the total oxidation to CO2 already in the photocatalytic tests at room temperature. The presence of small amounts of cerium oxide allowed to obtain efficient brookite-based composites facilitating the space charge separation and increasing the lifetime of the photogenerated holes and electrons as confirmed by the characterization measurements. The possibility to concurrently utilize the photocatalytic properties of brookite and the redox properties of CeO2, both activated in the photothermal tests, is an attractive approach easily applicable to purify air from VOCs.

show abstract

Section: Photothermo-catalytic Mechanismsmentioning

confidence: 99%

Exploring the Photothermo-Catalytic Performance of Brookite TiO2-CeO2 Composites

et al. 2020

View full text Add to dashboard Cite

show abstract

“…As Pt and Ce precursors were uniformly deposited on graphene oxides, the sample was annealed at 450°C to remove the graphene oxides and form the Pt-doped CeO 2 nanosheets (denoted as Pt s -CeO 2 ) (see Figure S2 ). X-ray diffraction patterns show only diffraction peaks of CeO 2 , and no peak assigned to metallic Pt on Pt s -CeO 2 (see Figure S3 A) ( Kong et al., 2020 ). Energy-dispersive X-ray spectroscope (EDS) shows that the molar content of Pt was 7.4 at% (see Figure S3 B).…”

Section: Resultsmentioning

confidence: 99%

Ambient sunlight-driven photothermal methanol dehydrogenation for syngas production with 32.9 % solar-to-hydrogen conversion efficiency

Bai

Yuan

et al. 2021

iScience

View full text Add to dashboard Cite

Summary Methanol dehydrogenation is an efficient way to produce syngas with high quality. The current efficiency of sunlight-driven methanol dehydrogenation is poor, which is limited by the lack of excellent catalysts and effective methods to convert sunlight into chemicals. Here, we show that atomically substitutional Pt-doped in CeO 2 nanosheets (Pt s -CeO 2 ) exhibit excellent methanol dehydrogenation activity with 500-hr level catalytic stability, 11 times higher than that of Pt nanoparticles/CeO 2 . Further, we introduce a photothermal conversion device to heat Pt s -CeO 2 up to 299°C under 1 sun irradiation owning to efficient full sunlight absorption and low heat dissipation, thus achieving an extraordinarily high methanol dehydrogenation performance with a 481.1 mmol g −1 h −1 of H 2 production rate and a high solar-to-hydrogen (STH) efficiency of 32.9%. Our method represents another progress for ambient sunlight-driven stable and active methanol dehydrogenation technology.

show abstract

“…58,59 The peak intensity of O ads in 7:3 Mn-Ce is higher than pure CeO 2 , indicating the increased concentrations or number of oxygen vacancies. 50,[60][61][62] According to the fitting information in XPS peak software, the concentrations of Ce 3+ in 7:3 Mn-Ce and pure CeO 2 were calculated to be 14.4% and 8.2%, respectively. The O ads in 7:3 Mn-Ce and pure CeO 2 were calculated to be 40.2% and 28.9%, respectively.…”

Section: Morphological and Structural Propertiesmentioning

confidence: 99%

Fabrication of Mn-Ce Bimetallic Oxides as Electrode Material for Supercapacitors with High Performance

Zhou

Han

et al. 2021

Journal of Elec Materi

View full text Add to dashboard Cite

Manganese and cerium (Mn-Ce) oxides were prepared under nitrogen and high-temperature oxidation via a bath precipitation method as materials for electrode assemblies in supercapacitors. The prepared Mn-Ce oxide composite was demonstrated to have a high specific capacitance of 163.7 F g À1 with 78.4% cyclic stability after 3000 cycles at a current density of 1 A g À1 . Electrochemical impedance spectroscopy confirms that MnO 2 improves the conductivity of CeO 2 . Results from XPS analysis suggest that the introduction of MnO 2 enhances the concentrations of oxygen vacancies. Finally, band structure, density of states and Mulliken population were calculated using density functional theory, and the findings are consistent with the experimental and characterization results. Because of their excellent performances, Mn-Ce bimetallic oxides are promising electrode materials for supercapacitors.

show abstract

Introduce oxygen vacancies into CeO2 catalyst for enhanced coke resistance during photothermocatalytic oxidation of typical VOCs

Cited by 239 publications

References 49 publications

Exploring the Photothermo-Catalytic Performance of Brookite TiO2-CeO2 Composites

Exploring the Photothermo-Catalytic Performance of Brookite TiO2-CeO2 Composites

Ambient sunlight-driven photothermal methanol dehydrogenation for syngas production with 32.9 % solar-to-hydrogen conversion efficiency

Fabrication of Mn-Ce Bimetallic Oxides as Electrode Material for Supercapacitors with High Performance

Contact Info

Product

Resources

About