The effect of M (Li+, K+, Mg2+, Al3+) ions on the quantum efficiency of YBO3:Eu3+ phosphors

Wang, Longcheng; Zhang, Wenjun; Li, Qun; Wu, Guangjie; Zhang, Yongfei; Jin, Dalai

doi:10.1016/j.ijleo.2019.163787

Cited by 6 publications

(4 citation statements)

References 37 publications

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“…The substituting degree of the MnO 2 framework is determined by the ionic radius and coordination. The ionic radius of Mn 4+ (0.053 nm) is close to that of Al 3+ (0.0535 nm). − These results illustrate that part of Al 3+ cations substitute the Mn 4+ that forms Al-substituted α-MnO 2 in the Mn–Al oxides. , …”

Section: Resultsmentioning

confidence: 57%

Accelerating the Low-Temperature Catalytic Oxidation of Acetone over Al-Substituted Mn–Al Oxides by Rate-Limiting Step Modulation

Lǐ

Zhang

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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In order to enhance the catalytic activity and improve the stability of Mn–Al oxides in acetone oxidation, it is interesting to have found that modulating and accelerating the rate-limiting step by Al substitution rather than just mixing of Mn and Al is crucial for hydrocarbon efficient catalytic destruction. Here, a series of Mn–Al oxides with different Al substitution ratios were prepared by a scalable and facile hydrothermal-redox strategy. The reaction rate, selectivity, and stability of the representative α-MnO2 catalyst in acetone oxidation can be remarkably promoted by simple replacing of the partial framework Mn with Al, which changes the rate-limiting step from acetic acid dissociation to ethanol decomposition accelerated by H2O molecules. Among them, MnAl0.5 displays the best catalytic performance with 90% of acetone converted at just 165 °C and a remarkable CO2 yield. DFT results suggest that the p y and p x orbitals of the O element take part in the formation of the carbonyl group when the intermediate of removing H* from ethanol reacts with the hydroxyl group of H2O. The d xz orbital of Mn with p-electron of Al plays a vital role in the rate-limiting step. The work provides new insights into engineering catalysts for industrial VOC efficient and economical mineralization.

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Section: Resultsmentioning

confidence: 57%

Accelerating the Low-Temperature Catalytic Oxidation of Acetone over Al-Substituted Mn–Al Oxides by Rate-Limiting Step Modulation

Lǐ

Zhang

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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“…It is apparent that the PL emission peak pattern of the samples remained largely unchanged, apart from the red-shift that occurred in response to the replacement of Sr 2+ ( R = 1.26 Å, CN = 8) or Ba 2+ ( R = 1.42 Å, CN = 8) with Ca 2+ ( R = 1.12 Å, CN = 8) with a smaller radius, as illustrated in Fig. 3(c) and (d). 26 Significantly, the utilization of Ge vacancy induction and Ca solid solution in (Sr/Ba)Ge 4 O 9 :Mn 2+ results in the manifestation of not only PL properties but also PersL emissions in the material, as evidenced by Fig. 3(e)–(f).…”

Section: Resultsmentioning

confidence: 86%

“…3(c) and (d). 26 Significantly, the utilization of Ge vacancy induction and Ca solid solution in (Sr/Ba)Ge 4 O 9 :Mn 2+ results in the manifestation of not only PL properties but also PersL emissions in the material, as evidenced by Fig. 3(e)-(f ).…”

Section: Papermentioning

confidence: 87%

Probing into the conduction band and type of carriers/traps on red/orange persistent phosphors in vacancy & solid-solution induced (Sr/Ba)_1−xCa_xGe_4−yO₉:Mn²⁺

Peng

Wang

2023

Dalton Trans.

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“…[26] In addition, emulsion is a kind of dynamically unstable system, and there are many unstable factors of the emulsion developed by emulsification on the ground, so how to prolong the stability time of emulsion system has become a new research direction in the preparation of emulsion system. [27] In article, in order to obtain a more stable emulsion system, zwitterionic surfactants sulfonated fluorinated betaine (SFN) and anionic surfactant sodium alkylbenzene sulfonate (SDBS) were compounded firstly in a certain proportion, and then mixed with monodispersed partially hydrophobic silanized SiO 2 solution (particle diameter of 25 nm) proportionately, after that the interfacial film formed by the irreversible adsorption on the interface between SiO 2 particles and emulsion drops could inhibit the coalescence between the droplets, the compound emulsifier was obtained finally. The method of emulsifying in core was used to simulate the underground emulsification process, and pore-throat emulsion was developed.…”

Section: Introductionmentioning

confidence: 99%

Research on Oil Displaced Effect of Multi‐Component Pore‐Throat Emulsion System

2018

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The core displacement experiment is designed to simulate the emulsification process of crude oil in reservoir, and a multi‐component pore‐throat emulsion system (0.8% hexadecane fluorinated betaine (CFN) + 0.4% sodium dodecylbenzenesulfonate (SDBS) + 1.2% monodisperse partially hydrophobic silanized SiO2 solution (particle diameter of 25 nm) + 0.9% sodium chloride (NaCl)), system 1, was developed. By comparing this system with the other emulsion systems, the stability and comprehensive performance of this system were evaluated. The results showed that the water evolution rate of emulsion system 1 was the smallest, 46.3%, which indicated that the stability of system 1 was the best, and the synergistic ability of emulsifiers CFN and SDBS was effective. After alkylation, nano‐sized SiO2 particles are turned into a special structure of hemispheric hydrophobic and hemispheric hydrophilic. They are closely adsorbed on oil‐water interface, which can inhibit the aggregation between emulsion drops and enhance the stability of emulsion. The micro particle size of emulsion was observed using inverted biological microscope, and it was found that the range of system 1 was the smallest. And microscopically or macroscopically, the properties such as the average diameter of the droplet, separation coefficient, effective share of the droplet, emulsion strength and stability comprehensive coefficient, were dominant. Therefore, the performance of system 1 was well. The displacement effect of emulsion flooding and change of fluid production in each layer under different permeability contrast were researched by three‐tube parallel core displacement experiment. It was found that oil displacement effect of system 1 was the best, the greater the coefficient of permeability variation, the greater decline of liquid production in the high permeability reservoir, and the greater increase of liquid production in the middle and low permeability reservoir. The new emulsion flooding system provides a new idea for the development of heterogeneous reservoirs.

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The effect of M (Li+, K+, Mg2+, Al3+) ions on the quantum efficiency of YBO3:Eu3+ phosphors

Cited by 6 publications

References 37 publications

Accelerating the Low-Temperature Catalytic Oxidation of Acetone over Al-Substituted Mn–Al Oxides by Rate-Limiting Step Modulation

Accelerating the Low-Temperature Catalytic Oxidation of Acetone over Al-Substituted Mn–Al Oxides by Rate-Limiting Step Modulation

Probing into the conduction band and type of carriers/traps on red/orange persistent phosphors in vacancy & solid-solution induced (Sr/Ba)_1−xCa_xGe_4−yO₉:Mn²⁺

Research on Oil Displaced Effect of Multi‐Component Pore‐Throat Emulsion System

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The effect of M (Li+, K+, Mg2+, Al3+) ions on the quantum efficiency of YBO3:Eu3+ phosphors

Cited by 6 publications

References 37 publications

Accelerating the Low-Temperature Catalytic Oxidation of Acetone over Al-Substituted Mn–Al Oxides by Rate-Limiting Step Modulation

Accelerating the Low-Temperature Catalytic Oxidation of Acetone over Al-Substituted Mn–Al Oxides by Rate-Limiting Step Modulation

Probing into the conduction band and type of carriers/traps on red/orange persistent phosphors in vacancy & solid-solution induced (Sr/Ba)1−xCaxGe4−yO9:Mn2+

Research on Oil Displaced Effect of Multi‐Component Pore‐Throat Emulsion System

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Probing into the conduction band and type of carriers/traps on red/orange persistent phosphors in vacancy & solid-solution induced (Sr/Ba)_1−xCa_xGe_4−yO₉:Mn²⁺