Study of the effect of the acid-base surface properties of ZnO, Fe2O3 and ZnFe2O4 oxides on their gas sensitivity to ethanol vapor

Karpova, S. S.; Мошников, В. А.; Maksimov, A. I.; Mjakin, S. V.

doi:10.1134/s1063782613080095

Cited by 55 publications

(21 citation statements)

References 16 publications

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“…4). In general, the obtained ZnO nanostructures adsorption sites distribution is typical for most oxides [19]. Analyzing zinc oxide, it should be noticed that Zn 2+ atoms in ZnO lattice correspond to acid Lewis sites and О 2atoms with filled electronic shell, capable to attach proton or Lewis acid correspond to basic Lewis sites.…”

Section: Resultsmentioning

confidence: 82%

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Cys-modified zinc oxide 1D-nanostructures formation for gas sensors application

Semenova¹,

Yukhnovets²,

Maximov³

et al. 2018

EAI Endorsed Transactions on Energy Web

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In this work, the ZnO-based materials were synthesized for gas sensors applications. The nanostructures formation was carried out by mild hydrothermal synthesis with the variations in surfactant concentration. The qualitative and quantitative analysis of the surface states in ZnO nanocrystals was performed. The effect of surfactant (cysteine) adsorption on ZnO 1D-nanostructures growth and the distribution of acid-bade adsorption sites on nanostructures surface were investigated. The control of the nanorods aspect ratio (about 0.4 at cystein concentration of 5 mM/l) leads to the changes in the Zn 2+ /O 2ions proportion, emerging on the surface. High cysteine concentrations resulted in the formation of Brönsted acid and Lewis base adsorption sites.

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Section: Resultsmentioning

confidence: 82%

“…After calculating the concentration of the sites for all indicators, the distribution curve q = f (pKa) was plotted. A detailed description of the experimental and calculation methods is given in [19,20].…”

Section: Methodsmentioning

confidence: 99%

Cys-modified zinc oxide 1D-nanostructures formation for gas sensors application

Semenova¹,

Yukhnovets²,

Maximov³

et al. 2018

EAI Endorsed Transactions on Energy Web

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“…The deacidification rate was 97.6% by using the composite catalyst with a Fe 2 O 3 -doped amount of 0.5%. Fe 2 O 3 addition could help to improve the esterification rate, because there are more surface weak acid sites on Fe 2 O 3 than that of ZnO (in Table 2), which is a benefit for the esterification reaction [23][24][25], so the Fe 2 O 3 -doped catalyst resulted in a higher deacidification rate. Then, the deacidification rate changed little in spite of more Fe 2 O 3 , and the maximum rate was 98.4%.…”

Section: Effect Of Fe 2 O 3 Doped Amountmentioning

confidence: 99%

Catalytic Deacidification of Vacuum Gas Oil by ZnO/Al2O3 and Its Modification with Fe2O3

Bai

Lian

et al. 2019

Catalysts

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High acidic vacuum gas oil (VGO) decreases product quality and causes corrosions. To overcome these problems, catalytic esterification was utilized for the deacidification of VGO. A series of Al2O3-supported ZnO catalysts, undoped and doped with Fe2O3, were prepared and characterized. The results showed that both the ZnO/Al2O3 and the ZnO/Al2O3 doped with Fe2O3 had good deacidification effects with glycol for the 4th VGO. The deacidification rate reached 95.1% and 97.6%, respectively, under mild conditions (catalysts 2.5 wt%, glycol dosage 4.0 wt%, 250 °C and 1 h). The naphthenic acids were transferred into ester, which was proved by the Fourier Transform Infrared (FT-IR) and 1H nuclear magnetic resonance (NMR).Reusability of the catalyst for the esterification reaction was also studied. It was found that the deacidification rate was still over 90% after six reruns.

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“…The additional peaks of O 1s in ETY-FCZ are detected at 533.2 and 531.8 eV. The O 1s peak at 533.2 eV is attributed to chemisorbed or dissociated oxygen, -CO 3 , or OH species on the surface of ETY-FCZ[24,25]. The medium binding energy of O 1s peak at 531.8 eV is consistent with O 2-ions located in oxygen-deficient regions of ETY-FCZ, which are produced by the variations of the oxygen vacancy concentrations[26].3.5 Optical propertiesThe UV-Vis-NIR diffuse reflectance spectra of CZ and ETY-FCZ are shown inFig.…”

mentioning

confidence: 92%