Study of the Acid Site Structure on the WO<sub>3</sub>/ZrO<sub>2</sub> Surface

Brei, V. V.; Melezhyk, O.V.; Prudius, S.V.; Tel’biz, G. M.; Oranska, O.I.

doi:10.1260/0263617054037754

Cited by 6 publications

(15 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason for the appearance of strong acidity in tungstate-containing ZrO 2 remains unclear in many cases and continues to be discussed in the literature [34,36,39,[42][43][44][45]. Most of the results from study of the active centers on the WO 3 /ZrO 2 surface were obtained using electronic and IR spectroscopy.…”

Section: The Acid Centers Of Wo 3 /Zromentioning

confidence: 99%

“…The IR spectra also contain bands for the W=O and W-O stretching vibrations in the region of 1200-400 cm -1 [34,45,46]. The bands at 1080 and 980 cm -1 belong to the W=O vibrations.…”

Section: The Acid Centers Of Wo 3 /Zromentioning

confidence: 99%

“…The bands at 1080 and 980 cm -1 belong to the W=O vibrations. Absorption at 960 and 980 cm -1 is characteristic of polytungstate anions W 6 O 20 (OH) 5 The Brönsted and Lewis acidity of the tungstate-containing zirconium dioxide shows up in the IR spectra of chemisorbed pyridine [34,45,47], acetonitrile [45], and carbon monoxide [46]. The B centers on the surface of WO 3 /ZrO 2 are stable up to 500°C [45].…”

Section: The Acid Centers Of Wo 3 /Zromentioning

confidence: 99%

“…Absorption at 960 and 980 cm -1 is characteristic of polytungstate anions W 6 O 20 (OH) 5 The Brönsted and Lewis acidity of the tungstate-containing zirconium dioxide shows up in the IR spectra of chemisorbed pyridine [34,45,47], acetonitrile [45], and carbon monoxide [46]. The B centers on the surface of WO 3 /ZrO 2 are stable up to 500°C [45]. In the IR spectra of pyridine adsorbed on mesoporous WO 3 /ZrO 2 previously evacuated at 700°C the band at 1550 cm -1 is absent, and only the bands at 1610 and 1440 cm -1 characteristic of the L centers are observed [45].…”

Section: The Acid Centers Of Wo 3 /Zromentioning

confidence: 99%

“…The B centers on the surface of WO 3 /ZrO 2 are stable up to 500°C [45]. In the IR spectra of pyridine adsorbed on mesoporous WO 3 /ZrO 2 previously evacuated at 700°C the band at 1550 cm -1 is absent, and only the bands at 1610 and 1440 cm -1 characteristic of the L centers are observed [45]. The Lewis centers appear in the IR spectra of adsorbed CD 3 CN in the form of two absorption bands at 2304 and 2348 cm -1 [45].…”

Section: The Acid Centers Of Wo 3 /Zromentioning

confidence: 99%

See 4 more Smart Citations

Superacids Based on Zirconium Dioxide

Brei

2005

Theor Exp Chem

View full text Add to dashboard Cite

Section: The Acid Centers Of Wo 3 /Zromentioning

confidence: 99%

“…The IR spectra also contain bands for the W=O and W-O stretching vibrations in the region of 1200-400 cm -1 [34,45,46]. The bands at 1080 and 980 cm -1 belong to the W=O vibrations.…”

Section: The Acid Centers Of Wo 3 /Zromentioning

confidence: 99%

Section: The Acid Centers Of Wo 3 /Zromentioning

confidence: 99%

Section: The Acid Centers Of Wo 3 /Zromentioning

confidence: 99%

Section: The Acid Centers Of Wo 3 /Zromentioning

confidence: 99%

See 3 more Smart Citations

Superacids Based on Zirconium Dioxide

Brei

2005

Theor Exp Chem

View full text Add to dashboard Cite

Ionically Conductive Tunnels in h‐WO₃ Enable High‐Rate NH₄⁺ Storage

et al. 2022

View full text Add to dashboard Cite

Compared to the commonly applied metallic ion charge carriers (e.g., Li + and Na + ), batteries using nonmetallic charge carriers (e.g., H + and NH 4 + )generally have much faster kinetics and high-rate capability thanks to the small hydrated ionic sizes and nondiffusion control topochemistry. However, the hosts for nonmetallic charge carriers are still limited. In this work, it is suggested that mixed ionic-electronic conductors can serve as a promising host for NH 4 + storage. Using hexagonal tungsten oxide (h-WO 3 ) as an example, it is shown that the existence of ionic conductive tunnels greatly promotes the high-rate NH 4 + storage. Specifically, a much higher capacity of 82 mAh g -1 at 1 A g -1 is achieved on h-WO 3 , in sharp contrast to 14 mAh g -1 of monoclinic tungsten oxide (m-WO 3 ). In addition, unlike layered materials, the insertion and desertion of NH 4 + ions are confined within the tunnels of the h-WO 3 , which minimizes the damage to the crystal structure. This leads to outstanding stability of up to 200 000 cycles with 68% capacity retention at a high current of 20 A g -1 .

show abstract