Facile synthesis of WOx/ZrO2 catalysts using WO3·H2O precipitate as synthetic precursor of active tungsten species

Piva, D.H.; Piva, Roger Honorato; Pereira, Cristiane Aparecida; Silva, D.S.A.; Montedo, Oscar Rubem Klegues; Morelli, M. R.; Urquieta‐González, Ernesto A.

doi:10.1016/j.mtchem.2020.100367

Cited by 7 publications

(5 citation statements)

References 81 publications

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“…The interplanar spacing is estimated to be 0.295 nm. These values are aligned with the XRD results and correspond to the d -spacing of the (111) plane of t-ZrO 2 . The chemical elemental mapping by EDS analysis indicates the coexistence of W, O, and Zr, as shown in Figure c,e,f also reveals their uniform distribution throughout the sample. , …”

Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 79%

“…34 The chemical elemental mapping by EDS analysis indicates the coexistence of W, O, and Zr, as shown in Figure 2c,e,f also reveals their uniform distribution throughout the sample. 34,35 XPS was used to detect the surface chemical states and composition of elements of the WZ-22-650. The survey spectrum reveals the presence of W, O, C, and Zr in the WZ-22-650 (Figure 3a).…”

Section: Resultsmentioning

confidence: 80%

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Surface Electroactive Sites of Tungstated Zirconia Catalysts for Vanadium Redox Flow Batteries

Demeku,

Kabtamu,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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Surface electroactive sites for tungstate zirconia (WZ) were created by utilizing tungstate-immobilized UiO-66 as precursors via a double-solvent impregnation method under a mild calcination temperature. The WZ-22-650 catalyst, containing a moderate W content (22%), demonstrated a high density of surface electroactive sites. Proper heat treatment facilitated the binding of oligomeric tungsten clusters to stabilized tetragonal ZrO 2 , resulting in improved catalytic performance toward the VO 2+ /VO 2 + redox couples compared to other tested samples. The substantial surface area, mesoporous structure, and establishment of new W−O−Zr bonds affirm the firm anchoring of WO x to ZrO 2 . This robust attachment enhances surface electroactive sites, elevating the electrochemical performance of vanadium redox flow batteries (VRFBs). Charge−discharge tests further demonstrate that the superior voltage efficiency (VE) and energy efficiency (EE) for VRFBs using the WZ-22-650 catalyst are 87.76 and 83.94% at 80 mA cm −2 , which are 13.42% VE and 10.88% EE better than heat-treated graphite felt, respectively. Even at a higher current density of 160 mA cm −2 , VRFBs utilizing the WZ-22-650 catalyst maintained considerable efficiency, recording VE and EE values of 76.76 and 74.86%, respectively. This facile synthesis method resulted in WZ catalysts displaying superior catalytic activity and excellent cyclability, offering a promising avenue for the development of metal-oxide-based catalysts.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 80%

See 1 more Smart Citation

Surface Electroactive Sites of Tungstated Zirconia Catalysts for Vanadium Redox Flow Batteries

Demeku,

Kabtamu,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

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“…Similar to what was reported in literature (Jing et al 2009), the pyridine infrared adsorption of ZrO2 was only composed of the band at about 1450 cm -1 , indicating that the introduction of WO3 introduced the Brönsted acid sites to ZrO2. The number of Brönsted acid sites depends directly on the WO3 content (Piva et al 2020). Table 2 shows the detailed characterization data for the quantification.…”

Section: Py-ir Analysismentioning

confidence: 99%

Solid acid catalyst WO3-ZrO2 for the catalytic deoxygenation of jatropha oil for the preparation of aviation paraffin

Lin

Zhou

et al. 2022

BioRes

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WO3-ZrO2 solid acid catalysts were prepared by the impregnation method and characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), Brunauer-Emmett-Teller (BET), and pyridine adsorbed IR spectroscopy (Py-IR). The catalysts were used for catalytic deoxygenation of Jatropha curcas oil. The optimal conditions for the deoxygenation of the generated oil were obtained by response surface methodology based on Box-Behnken four-factor experiments. Response surface methodology (RSM) was applied while determining the optimal conditions for the Jatropha oil deoxygenation percentage. The rate was calculated based on Box-Behnken four-factor experiments, with reaction temperature, catalyst amount, reaction time, and reaction pressure as independent variables and the deoxygenation of Jatropha curcas oil as response values. The optimal reaction conditions obtained were a temperature of 370 °C, pressure of 2 MPa, time of 7 h, and catalyst amount of 0.22 g. The deoxygenation percentage of the generated oil under the optimal conditions was 95.1%, which was close to the theoretical value, indicating that the model was reliable. The generated oil contained more jet fuel components, with 68.1% C8-C16, 12.0% isoalkanes, 14.2% cycloalkanes, and 8.9% aromatic compounds under the optimum conditions. This study provides an effective and simple method for preparation of bio-aviation fuel.

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“…There is a general agreement on the differentiation between four tungsten surface species. 3,[7][8][9][10][11] In sub-monolayer concentrations octahedral isolated mono-oxo WO species grow with increasing W surface density to polymeric monooxo WO species. After reaching monolayer surface coverage, crystalline, monoclinic WO 3 nanoparticles start to form.…”

Section: Introductionmentioning

confidence: 99%

Dehydration of fatty alcohols on zirconia supported tungstate catalysts

Milaković

Liu

Baráth

et al. 2022

Catal. Sci. Technol.

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Facile synthesis of WOx/ZrO2 catalysts using WO3·H2O precipitate as synthetic precursor of active tungsten species

Cited by 7 publications

References 81 publications

Surface Electroactive Sites of Tungstated Zirconia Catalysts for Vanadium Redox Flow Batteries

Surface Electroactive Sites of Tungstated Zirconia Catalysts for Vanadium Redox Flow Batteries

Solid acid catalyst WO3-ZrO2 for the catalytic deoxygenation of jatropha oil for the preparation of aviation paraffin

Dehydration of fatty alcohols on zirconia supported tungstate catalysts

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