A Comparison of the Redox Properties of Bulk Vanadium Mixed Oxide Catalysts

Wang, Nai-liang; Qiu, Jian-e; Wu, Jian; You, Kuiyi; Luo, He’an

doi:10.1007/s10562-015-1584-6

Cited by 11 publications

(3 citation statements)

References 27 publications

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“…Raman spectra collected at room temperature is shown in Figure 4. The Raman spectra of BiVO 4 , CrVO 4 , FeVO 4 , and Co 2 V 2 O 7 were in agreement with literature [10,20,22,23] and the spectra did not show the characteristic bands of V 2 O 5 . Hence, no effort was taken to consider the product selectivity in this work.…”

Section: Thermal Expansion Propertysupporting

confidence: 88%

The Structure, Vibrational Spectra, and Thermal Expansion Study of AVO4 (A=Bi, Fe, Cr) and Co2V2O7

Zhang

Tian

2020

Materials

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Vanadate is an important functional material. It has been widely studied and applied in luminescence and photocatalysis. Vanadium compounds have been synthesized to investigate the thermal expansion properties and structure. Both BiVO4 and Co2V2O7 are monoclinic at room temperature, FeVO4’s crystal structure is triclinic, and CrVO4 is orthorhombic. The relatively linear, thermal-expansion, and temperature-dependent Raman spectroscopy results showed that the phase transition of BiVO4 occurred at 200 to 300 °C. The coefficient of thermal expansion (CTE) of Co2V2O7 was larger than that of the monoclinic structure BiVO4. The CTE of the tetragonal structure of BiVO4 was 15.27 × 10−6 °C−1 which was the largest CTE in our measurement results, and the CTE of anorthic structure FeVO4 was 2.84 × 10−6 °C−1 and was the smallest.

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Section: Thermal Expansion Propertysupporting

confidence: 88%

The Structure, Vibrational Spectra, and Thermal Expansion Study of AVO4 (A=Bi, Fe, Cr) and Co2V2O7

Zhang

Tian

2020

Materials

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“…The formation of the two characteristic peaks at 214 and 319 cm −1 can be caused by the elastic vibrations of the nonequivalent O─Fe bond. [23] 88 and 135 cm −1 can be devoted to the bending vibrations of the FeVO 4 polyhedra. It can also be seen that there are no characteristic peaks at 1000-1024 cm −1 , so the FeVO 4 samples synthesized at pH of 2 and 3 can be excluded from containing V 2 O 5 impurities, and there are no obvious 𝛼-Fe 2 O 3 phase characteristic peaks formed, indicating that the prepared samples are pure.…”

Section: Morphology and Structure Of Fevo 4 Samplesmentioning

confidence: 99%

Synthesis of FeVO₄ Nanoparticles and Sensing Performance for Ethanol Gas under Different Solution pH

Che

Feng

Guo

et al. 2021

Crystal Research and Technology

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FeVO 4 nanoparticles are synthesized by the hydrothermal method. The effect of micromorphology under different pH conditions is investigated. Their microstructure, morphology, and chemical composition are analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and N 2 adsorption-desorption. The results showed that an increase in pH leads to agglomeration of the material. The effect of different pH conditions on the gas-sensitive performance of FeVO 4 is subsequently investigated, and the best response performance of the FeVO 4 sensor is achieved at a pH of 3. The consequences showed that the FeVO 4 sensor has a response of 3.383 to 100 ppm ethanol gas, with the response and recovery time of 1 and 7 s. The response cycle test has proved that FeVO 4 has good stability. Analyzed in conjunction with the characterization results, the oxygen vacancies on the surface of the nanoparticles not only improve the electronic conductivity but also provide active sites for the adsorption of gases, which helps to improve the sensitivity of the material to gases.

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“…Several metal oxides, including supported vanadium oxides catalysts, have been studied for methanol oxidation [4,[36][37][38][39]. In addition, a comparison between catalytic performance for oxidation of methanol [39][40][41][42][43] or ethanol [44] and propane ODH has been reported in the last years. More recently, it has been reported that the use of methanol adsorption/desorption followed by in situ DRIFTS could be of interest in order to determine the concentration of active sites in Nb-doped nickel oxide catalysts, which are very selective in the ethane ODH [29].…”

Section: Introductionmentioning

confidence: 99%

Vanadium Supported on Alumina and/or Zirconia Catalysts for the Selective Transformation of Ethane and Methanol

et al. 2018

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Vanadium supported on pure (Al 2 O 3 , ZrO 2 ) or mixed zirconia-alumina (with Al/(Al + Zr) ratio of 0.75 or 0.25) catalysts have been prepared by wet impregnation, using homemade prepared supports. The catalysts have been characterized and tested in the oxidative dehydrogenation (ODH) of ethane and in the methanol aerobic transformation. The catalytic performance strongly depends on the nature of the metal oxide support. Thus, activity decreases in the order: VOx/ZrO 2 > VOx/(Al,Zr-oxides) > VOx/Al 2 O 3 . On the other hand, at low and medium ethane conversions, the selectivity to ethylene presents an opposite trend: VOx/Al 2 O 3 > VOx/(Al,Zr-oxides) > VOx/ZrO 2 . The different selectivity to ethylene at high conversion is due to the lower/higher initial ethylene formation and to the extent of the ethylene decomposition. Interestingly, VOx/(Al,Zr-oxides) with low Zr-loading present the lowest ethylene decomposition. The catalytic results obtained mainly depend on the nature of the supports whereas the role of the dispersion of vanadium species is unclear. In methanol oxidation, the catalysts tested present similar catalytic activity regardless of the support (Al 2 O 3 , ZrO 2 or mixed Al 2 O 3 -ZrO 2 ) but strong differences in the selectivity to the reaction products. Thus, dimethyl ether was mainly observed on alumina-supported vanadium oxide catalysts (which is associated to the presence of acidic sites on the surface of the catalyst, as determined by TPD-NH 3 ). Formaldehyde was the main reaction product on catalysts supported on Zr-containing oxides (which can be related to a low presence of acid sites). In this article, the importance of the presence of acid sites in ethane ODH, which can be estimated using the methanol transformation reaction, is also discussed.

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A Comparison of the Redox Properties of Bulk Vanadium Mixed Oxide Catalysts

Cited by 11 publications

References 27 publications

The Structure, Vibrational Spectra, and Thermal Expansion Study of AVO4 (A=Bi, Fe, Cr) and Co2V2O7

The Structure, Vibrational Spectra, and Thermal Expansion Study of AVO4 (A=Bi, Fe, Cr) and Co2V2O7

Synthesis of FeVO₄ Nanoparticles and Sensing Performance for Ethanol Gas under Different Solution pH

Vanadium Supported on Alumina and/or Zirconia Catalysts for the Selective Transformation of Ethane and Methanol

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A Comparison of the Redox Properties of Bulk Vanadium Mixed Oxide Catalysts

Cited by 11 publications

References 27 publications

The Structure, Vibrational Spectra, and Thermal Expansion Study of AVO4 (A=Bi, Fe, Cr) and Co2V2O7

The Structure, Vibrational Spectra, and Thermal Expansion Study of AVO4 (A=Bi, Fe, Cr) and Co2V2O7

Synthesis of FeVO4 Nanoparticles and Sensing Performance for Ethanol Gas under Different Solution pH

Vanadium Supported on Alumina and/or Zirconia Catalysts for the Selective Transformation of Ethane and Methanol

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Synthesis of FeVO₄ Nanoparticles and Sensing Performance for Ethanol Gas under Different Solution pH