Polyoxometalate-based Gemini ionic catalysts for selective oxidation of benzyl alcohol with hydrogen peroxide in water

Hao, Pengbo; Zhang, Mingjie; Zhang, Wei; Tang, Zhiyang; Luo, Ning; Tan, Rong; Yin, Daqiang

doi:10.1039/c8cy01191e

Cited by 34 publications

(21 citation statements)

References 48 publications

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“…46,47 Noteworthy, the characteristic bands of hydroxyl groups (at 3450 cm . 48,49 It reveals the formation of Keggin-type ammonium PW in JNS-PW x . In particular, the WO d stretching vibration band shifts from 987 to 978 cm −1 , due to the ionic interaction in the PW-based hybrid.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

Phosphotungstate-Functionalized Mesoporous Janus Silica Nanosheets for Reaction-Controlled Pickering Interfacial Catalysis

Liu

et al. 2021

ACS Sustainable Chem. Eng.

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Pickering interfacial catalysis enables oil/water biphasic reactions to efficiently proceed by the formation of stable Pickering emulsions. However, a convenient approach to control the emulsion properties, so as to combine the reactivity and recovery of catalytic emulsifiers, remains challenging to date. Herein, we have reported the switchable transition between emulsification/demulsification controlled by the catalytic reaction process, to realize reaction-controlled Pickering interfacial catalysis. A novel series of phosphotungstate (PW)-functionalized mesoporous Janus silica nanosheets were thus prepared by selectively decorating ammonium PW on one side of mesosilica nanosheets. Characterization results suggested their H2O2-switched reversible emulsification/demulsification behavior in an oil/water biphasic system due to H2O2-induced wettability change in the ammonium PW moiety. The resultant H2O2-switchable Pickering emulsions induced an efficient Pickering interfacial catalysis approach for selective oxidation of alcohols by aqueous H2O2 in water, thus leading to remarkable high conversion and selectivity over a wide range of alcohols. When H2O2 was used up, they could be demulsified spontaneously, resulting in the complete separation of catalytic emulsifiers for steady reuse. The reaction-controlled emulsification/demulsification approach provided a sustainable way to combine reactivity and recovery of catalytic emulsifiers in Pickering interfacial catalysis, which was a benefit for energy-saving in industrial applications.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Phosphotungstate-Functionalized Mesoporous Janus Silica Nanosheets for Reaction-Controlled Pickering Interfacial Catalysis

Liu

et al. 2021

ACS Sustainable Chem. Eng.

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“…For benzyl alcohol oxidation L. Jing et al [127] We can also report a recent interesting work of Hao et al [128] They modified the phase increased with the length of the polyether chain (see Figure 14). The catalyst was tested for alcohol oxidation with hydrogen peroxide in 1.5 molar ratio.…”

Section:  Alcohols Oxidationmentioning

confidence: 55%

“…A remarkable enhancement of reaction rates with the employment of PIPA-13 was also observed in the case of 1-phenylethanol, cyclohexanol, diphenylmethanol, but for nhexanol or 2-phenylethanol the conversion is less than 17%. [128] with the permission from the Royal Society of Chemistry.) Qiao et al [105] reported two protic (N-dodecylimidazolium peroxotungstate 66% with a selectivity up to 99% (see Figure 15).…”

Section:  Alcohols Oxidationmentioning

confidence: 99%

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Designing Functional Polyoxometalate‐Based Ionic Liquid Crystals and Ionic Liquids

et al. 2019

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Polyoxometalate (POM) compounds constitute a wide family rich of more than several thousand inorganic compounds which can be finely tuned at the molecular level. Considering their high diversities in structures and properties, the incorporation of such inorganic components into liquid crystalline phases or ionic liquid phases is particularly relevant for the elaboration of functional materials. By adjusting the molecular structures of the anions and the nature of the counter cations, many authors designed different types of mesophases sometimes with application in optoelectronics, or true POM-based Ionic liquids (POM-ILs with melting temperature below 100 °C). The latter turn out to be highly interesting for various applications in catalysis, depollution, or protection of the historical heritage. This review focuses on the recent developments in these organic/inorganic hybrid materials, POMbased Ionic liquid crystal and POM-ILs and their applications.

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“…[17][18][19] Nano carbon materials, e.g., carbon nanotubes (CNT), carbon spheres (CS), carbon bers (CF) and graphene, are becoming the most popular alternative supports due to their abundant earth-reserves and easily controlled surface chemistry. 20,21 Most important of all, strong synergy is hardly formed between gold and carbon (e.g., CNT) unless special treatment was processed. 22 The weak interaction between gold and CNT acts as a double-edged parameter.…”

Section: Introductionmentioning

confidence: 99%

Boosting the catalytic behavior and stability of a gold catalyst with structure regulated by ceria

et al. 2022

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Polyoxometalate-based Gemini ionic catalysts for selective oxidation of benzyl alcohol with hydrogen peroxide in water

Abstract: Polyoxometalate-based Gemini ionic hybrids with inherent phase transfer capability are highly efficient and recyclable catalysts in the selective oxidation of alcohols with H2O2 in water.

Cited by 34 publications

References 48 publications

Phosphotungstate-Functionalized Mesoporous Janus Silica Nanosheets for Reaction-Controlled Pickering Interfacial Catalysis

Phosphotungstate-Functionalized Mesoporous Janus Silica Nanosheets for Reaction-Controlled Pickering Interfacial Catalysis

Designing Functional Polyoxometalate‐Based Ionic Liquid Crystals and Ionic Liquids

Boosting the catalytic behavior and stability of a gold catalyst with structure regulated by ceria

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