IR characterization of sulfated zirconia derived from zirconium sulfate

Platero, E. Escalona; Mentruit, M. Peñarroya

doi:10.1007/bf00813670

Cited by 49 publications

(26 citation statements)

References 26 publications

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“…These species are considered favorable for the photocatalytic activity since a larger amount of radicals is expected to be formed during illumination [11,30]. ZrO2 spectra show two bands at 3723 cm -1 and 3553 cm -1 attributed to the multi-centered OH groups bound to Zr 4+ sites, Figure 3 v [31]. The band at 3634 cm -1 corresponds to Ti-OH and Zr-OH vibrations [11].…”

Section: Photocatalysts Characterizationmentioning

confidence: 93%

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Guerrero-Araque

Ramírez-Ortega

Acevedo–Peña

et al. 2017

Journal of Photochemistry and Photobiology A: Chemistry

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2 Graphical abstract Highlights: ZrO2-TiO2 heterojunction with high photocatalytic activity were obtained by solgel. Energy states at heterojunction interface altered the semiconducting properties. 5 mol% ZrO2 in ZrO2-TiO2 heterojunction propitiated a better electron-hole separation. Photocatalytic activity is improved by favoring the charge transfer process. Direct and indirect charge transfer process involved in phototocatalytic process. Abstract.In this paper, ZrO2-TiO2 composites were synthesized by sol-gel method with different ZrO2:TiO2 molar ratios (01:99, 05:95 and 10:90). The results identified two trends; at a low ZrO2 content, the incorporation of Zr 4+ into the TiO2 lattice was possible provoking generation of oxygen vacancies (1 mol % of ZrO2); while at higher ZrO2 contents, ZrO2-TiO2 heterojunctions were created (5 and 10 mol % of ZrO2). The photocatalytic activity was evaluated by measuring photodegradation of phenoxyacetic acid, 2,4-dichlorophenoxyacetic acid or 4-chlorophenol solutions. The ZT-5 composite shows the best performance attributed to surface states at the interface of ZrO2-TiO2 heterojunctions.These surface states act as traps for charge carriers favoring the spatial separation of electron-hole pairs until reaching a maximum in the composite with 5 mol% of ZrO2. The ZT-5 composite showed the most negative flat band potential and the highest donor density indicating that these surface states are in optimal concentration. At higher ZrO2 contents, charge carrier separation is less effective, which decreases the photocatalytic activity.Nevertheless, the molecule structure has an impact on the direct or indirect charge transfer process as was evidenced by EIS measurements.

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Section: Photocatalysts Characterizationmentioning

confidence: 93%

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Guerrero-Araque

Ramírez-Ortega

Acevedo–Peña

et al. 2017

Journal of Photochemistry and Photobiology A: Chemistry

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“…Av olcano shape with the highest r NH 3 of 32.7 ug h À1 mg À1 cat and am aximum FE of 18.1 %a t À0. 45 Vwas obtained (Figure 4b).…”

Section: Electroreduction Of N 2 To Nhmentioning

confidence: 97%

Identification of M‐NH₂‐NH₂ Intermediate and Rate Determining Step for Nitrogen Reduction with Bioinspired Sulfur‐Bonded FeW Catalyst

Zhao

et al. 2021

Angew Chem Int Ed

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The multimetallic sulfur-framework catalytic site of biological nitrogenases allows the efficient conversion of dinitrogen (N 2 )toammonia (NH 3 )u nder ambient conditions. Inspired by biological nitrogenases,abimetallic sulfide material (FeWS x @FeWO 4 )was synthesized as ahighly efficient N 2 reduction (NRR) catalyst by sulfur substitution of the surface of FeWO 4 nanoparticles.T hus prepared FeW-S x @FeWO 4 catalysts exhibit ar elatively high NH 3 production rate of 30.2 ug h À1 mg À1 cat and aF araday efficiency of 16.4 %at À0.45 Vv ersus ar eversible hydrogen electrode in af low cell; these results have been confirmed via purified 15 N 2 -isotopic labeling experiments.I ns itu Raman spectra and hydrazine reduction kinetics analysis revealed that the reduction of undissociated hydrazine intermediates (M-NH 2 -NH 2 )o nt he surface of the bimetallic sulfide catalyst is the rate-determing step for the NRR process.T herefore,t his work can provide guidance for elucidating the structure-activity relationship of NRR catalysts.

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“…The gel was heated at 80°C to evaporate excess alcohol and calcinated at 600°C for 7 h in air to get the white SZ solid. Also the preparation of SZ catalyst may also be performed in one step by thermal decomposition of Zr(SO 4 ) 2 as shown in the following equation [22,23]:…”

Section: One-step Methodsmentioning

confidence: 99%

Promoted Zirconia Solid Acid Catalysts for Organic Synthesis

Patil¹

2008

COC

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This review deals with the catalytic performance of sulfate, molybdate and tungstate ion promoted zirconia solid acid catalysts for various acid-catalyzed organic synthesis and transformation reactions in the liquid phase. These promoted zirconia catalysts exhibit superacidity which mainly depends on the preparation conditions. In particular, the sulfated zirconia catalyst exhibits very strong solid acidity and excellent catalytic activity not only for simple acylation, condensation and esterification reactions but also for other important reactions such as synthesis of aromatic gem-dihalides, stereocontrolled glycosidation, regioselective ring opening of aziridines, production of diaryl sulfoxides and so on. Molybdate and tungstate promoted zirconia catalysts that also exhibit good catalytic activity for various organic reactions of practical importance.

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IR characterization of sulfated zirconia derived from zirconium sulfate

Cited by 49 publications

References 26 publications

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Identification of M‐NH₂‐NH₂ Intermediate and Rate Determining Step for Nitrogen Reduction with Bioinspired Sulfur‐Bonded FeW Catalyst

Promoted Zirconia Solid Acid Catalysts for Organic Synthesis

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IR characterization of sulfated zirconia derived from zirconium sulfate

Cited by 49 publications

References 26 publications

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Interfacial charge-transfer process across ZrO2-TiO2 heterojunction and its impact on photocatalytic activity

Identification of M‐NH2‐NH2 Intermediate and Rate Determining Step for Nitrogen Reduction with Bioinspired Sulfur‐Bonded FeW Catalyst

Promoted Zirconia Solid Acid Catalysts for Organic Synthesis

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Identification of M‐NH₂‐NH₂ Intermediate and Rate Determining Step for Nitrogen Reduction with Bioinspired Sulfur‐Bonded FeW Catalyst