Samarium doping boosts catalytic oxidation of airborne benzene over todorokite-type MnO2

Liu, Yang; Yan, Lei; Gao, Wei; Zhu, Si-Rui; Zhan, Jingjing; Cao, Ranran

doi:10.1016/j.apsusc.2019.144043

Cited by 34 publications

(20 citation statements)

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“…It is generally accepted that the redox behaviors, structure defects, and surface acidity of metal oxides catalysts play significant roles for dominating their VOCs oxidation performances. − Based on the characterization results of XRD, it can be noted that the niobium introduction into MnO x triggered the crystalline formation of Mn 2 O 3 from Mn 3 O 4 , demonstrating the strong intrinsic interaction between manganese and niobium cations. Furthermore, the absence of XRD patterns corresponding to niobium oxide over the MnNbO x composite oxides evidenced the homogeneous insertion of niobium into the MnO x lattice in the form of Mn–Nb solid solution.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Combustion of Propane over MnNbO_x Composite Oxides: The Promotional Role of Niobium

Zeng

Wang

Huang

et al. 2021

Ind. Eng. Chem. Res.

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Metal-doping is an efficient strategy to develop high-activity composite metal oxides catalysts for VOCs abatement. Herein, MnNbO x composite oxides were prepared using niobium element as a modification additive, finding that niobium addition presented a promotional effect on boosting the catalytic activity of MnO x for propane combustion. It was demonstrated that niobium insertion into manganese oxides was in favor of the formation of Mn3O4 crystalline phase and concurrently caused higher redox ability, more abundant surface oxygen species, and acid sites. All these properties were considered to be crucial parameters for catalytic activity enhancement. Among all, the catalyst of Mn0.85Nb0.15O x (simply designated as M0.85N0.15) showed the highest propane conversion efficiency and relatively good catalytic durability under CO2-containing atmospheres. Moreover, the in situ DRIFTs analysis highlighted the important role of surface acidity in the surface catalytic pathways of propane adsorption, activation, and oxidation.

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Section: Resultsmentioning

confidence: 99%

Catalytic Combustion of Propane over MnNbO_x Composite Oxides: The Promotional Role of Niobium

Zeng

Wang

Huang

et al. 2021

Ind. Eng. Chem. Res.

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“…14 Figure 2A illustrates the XPS spectrum of CENMO ceramics at room temperature, where we observed only Ca, Eu, Nb, Mo, and O. The positions of the individual characteristic peaks were assigned to the elements 39,40 The peak centered at 530.08 eV is attributed to the Eu-O bond in CENMO, which indicates that the oxygen ion in the ceramic is bound to the europium ion; the peak located around 531.68 eV is the chemical state of the sample with adsorbed oxygen.…”

Section: Resultsmentioning

confidence: 98%

“…Figure 2B displays the XPS high‐resolution scanning spectra of O 1 s . The fitted spectrum was divided into two peaks at 530.08 eV and 531.68 eV, which are lattice oxygen and chemical state oxygen 39,40 . The peak centered at 530.08 eV is attributed to the Eu‐O bond in CENMO, which indicates that the oxygen ion in the ceramic is bound to the europium ion; the peak located around 531.68 eV is the chemical state of the sample with adsorbed oxygen.…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

et al. 2022

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Solid‐solution ceramics show a potential in the field of electronic devices. In particular, it is necessary to investigate the photoluminescence and conductive properties of CaEuNbMoO8 (CENMO) solid solution ceramics. It is demonstrated that the sintered ceramics appear as CaMoO4 phase with scheelite structure. The results of X‐ray photoelectron spectroscopy show that the abnormal reduction of Eu3+→Eu2+ occurs in the ceramics, which is due to the formation of VCa′′$V_{Ca}^{^{\prime\prime}}$ vacancy caused by the substitution of Ca2+ by Eu3+, making it act as electron donors. The change of local symmetry of Eu3+ ions in ceramics results in a strong red fluorescence, and the charge transition between Eu, Nb, and Mo ions and O ions in the host lattice results in the near‐ultraviolet (near‐UV) excitation. As a result, CaEuNbMoO8 ceramic materials have promising applications in both near‐ultraviolet excited light‐emitting diodes and thermistors.

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“…However, how to inhibit the tendency of aggregation of the single noble atoms during the synthesis and in the catalytic process is still a big challenge . Rare-earth elements are also usually doped into the transition metal oxides to improve the catalytic activity. ,, The doping of rare-earth elements has many potential advantages such as tuning the crystal structure, increasing the active sites, providing additional active oxygen, improving the structure stability of catalysts, and so on . Thus, it is interesting to know whether the doping of rare-earth elements in the form of single atoms can achieve catalytic activity higher than that by doping noble metals.…”

Section: Introductionmentioning

confidence: 99%

Atomically Dispersed Y or La on Birnessite-Type MnO₂ for the Catalytic Decomposition of Low-Concentration Toluene at Room Temperature

Zhang

Zheng

et al. 2021

ACS Appl. Mater. Interfaces

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Room-temperature catalytic decomposition of low-concentration volatile organic compounds (VOCs) in indoor air is an exciting dream to solve their pollution. Herein, two kinds of rare-earth elements (Y and La) were separately doped into birnessitetype MnO 2 nanosheets in the form of single atoms by the hydrothermal method. As-synthesized La/MnO 2 achieved 100% removal of 10 ppm toluene at 40 °C under the gas hourly space velocity of 60 L g −1 h −1 , which was even somewhat better than the single Pt atom-doped MnO 2 . In addition, La/MnO 2 showed the good durability at room temperature for 0.5 ppm toluene removal under the GHSV of 300 L g −1 h −1 and could be effectively regenerated at 105 °C. GC/FID, online-MS and TD-GC/MS analysis demonstrated that only ignorable trace benzene (∼3.4 ppb, < one thousandth of inlet toluene) was generated in the gas phase during catalytic decomposition of 10 ppm toluene at room temperature. This research sheds light on the development of low cost and high activity catalysts for low-concentration VOC oxidation at room temperature.

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Samarium doping boosts catalytic oxidation of airborne benzene over todorokite-type MnO2

Cited by 34 publications

References 50 publications

Catalytic Combustion of Propane over MnNbO_x Composite Oxides: The Promotional Role of Niobium

Catalytic Combustion of Propane over MnNbO_x Composite Oxides: The Promotional Role of Niobium

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

Atomically Dispersed Y or La on Birnessite-Type MnO₂ for the Catalytic Decomposition of Low-Concentration Toluene at Room Temperature

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Samarium doping boosts catalytic oxidation of airborne benzene over todorokite-type MnO2

Cited by 34 publications

References 50 publications

Catalytic Combustion of Propane over MnNbOx Composite Oxides: The Promotional Role of Niobium

Catalytic Combustion of Propane over MnNbOx Composite Oxides: The Promotional Role of Niobium

Photoluminescence and conductive properties of CaEuNbMoO8 solid‐solution ceramics

Atomically Dispersed Y or La on Birnessite-Type MnO2 for the Catalytic Decomposition of Low-Concentration Toluene at Room Temperature

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Catalytic Combustion of Propane over MnNbO_x Composite Oxides: The Promotional Role of Niobium

Catalytic Combustion of Propane over MnNbO_x Composite Oxides: The Promotional Role of Niobium

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

Atomically Dispersed Y or La on Birnessite-Type MnO₂ for the Catalytic Decomposition of Low-Concentration Toluene at Room Temperature