Tunable Catalysts for Solvent-Free Biphasic Systems: Pickering Interfacial Catalysts over Amphiphilic Silica Nanoparticles

Zhou, Wenjuan; Lin, Fang; Fan, Zhaoyu; Albela, Belén; Bonneviot, Laurent; Campo, Floryan De; Pera‐Titus, Marc; Clacens, Jean‐Marc

doi:10.1021/ja501019n

Cited by 145 publications

(106 citation statements)

References 36 publications

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“…For this system, an emulsion may need to be stabilised in work similar to that described by Zhou et al, who designed amphiphilic silica particles for the solvent-free acetalisation of long-chain fatty aldehydes with ethylene glycol [35]. In addition to this work, He et al has suggested that graphene oxide particles can also be used to stabilise emulsions of the oil-in-water type [36].…”

Section: Discussionmentioning

confidence: 99%

The Low Temperature Solvent-Free Aerobic Oxidation of Cyclohexene to Cyclohexane Diol over Highly Active Au/Graphite and Au/Graphene Catalysts

et al. 2018

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Abstract:The selectivity and activity of gold-catalysts supported on graphite and graphene have been compared in the oxidation of cyclohexene. These catalysts were prepared via impregnation and sol immobilisation methods, and tested using solventless and radical initiator-free reaction conditions. The selectivity of these catalysts has been directed towards cyclohexene epoxide using WO 3 as a co-catalyst and further to cyclohexane diol by the addition of water, achieving a maximum selectivity of 17% to the diol. The sol immobilisation catalysts were more reproducible and far more active, however, selectivity towards the diol was lower than for the impregnation catalyst. The results suggest that formation of cyclohexane diol through solventless oxidation of cyclohexene is limited by a number of factors, such as the formation of an allylic hydroperoxyl species as well as the amount of in situ generated water.

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Section: Discussionmentioning

confidence: 99%

The Low Temperature Solvent-Free Aerobic Oxidation of Cyclohexene to Cyclohexane Diol over Highly Active Au/Graphite and Au/Graphene Catalysts

et al. 2018

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“…The synthetic method of functionalized silica nanoparticles was according to previous work, [50] and shown in Fig. 1 …”

Section: Preparation Of the Functionalized Silica Nanoparticlesmentioning

confidence: 99%

Functionalized silica nanoparticles for conversion of fructose to 5-hydroxymethylfurfural

Yang

Huang

et al. 2016

Chemical Engineering Journal

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“…Zapata et al prepared water in oil emulsion stabilized by nanohybrid catalysts to promote the condensation and hydrogenation of biomass‐derived oxygenates 30 . Zhou et al used robust and recyclable amphiphilic SiO 2 with alkyl and propylsulfonic acid groups to rapidly and efficiently catalyze the acetalization of immiscible long‐chain fatty aldehydes with ethylene glycol 31 . In addition, many studies have focused on the stability and formation mechanism of Pickering emulsions 32,33 .…”

Section: Introductionmentioning

confidence: 99%

Novel continuous process for methacrolein production in numerous droplet reactors

et al. 2020

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A continuous process for methacrolein production was constructed by filling w/o Pickering emulsions in a column reactor. Ionic liquid (IL‐[HDEA]Ac) with secondary amine was designed to catalyze propionaldehyde condensation with formaldehyde through the Mannich reaction. Emulsion droplets encapsulated with IL aqueous solution were stabilized with modified SiO2 nanoparticles and dispersed in cyclohexane, which could be observed as numerous reactors. The properties of SiO2 stabilizer, such as wettability, surface groups, and the effect on interfacial tension were investigated. The characteristics of emulsion influenced by stabilizer properties and content were systematically studied. The droplet size, IL concentration and liquid hourly space velocity were optimized. The droplets were evaluated at 0.5 hr−1 for 150 hr without IL leakage and obvious activity decreasing, indicating the excellent stability of the emulsion system. The continuous process showed a 1.25‐fold enhancement in catalysis efficiency and less equipment compared to batch process.

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Tunable Catalysts for Solvent-Free Biphasic Systems: Pickering Interfacial Catalysts over Amphiphilic Silica Nanoparticles

Abstract: Stabilization of oil/oil Pickering emulsions using robust and recyclable catalytic amphiphilic silica nanoparticles bearing alkyl and propylsulfonic acid groups allows fast and efficient solvent-free acetalization of immiscible long-chain fatty aldehydes with ethylene glycol.

Cited by 145 publications

References 36 publications

The Low Temperature Solvent-Free Aerobic Oxidation of Cyclohexene to Cyclohexane Diol over Highly Active Au/Graphite and Au/Graphene Catalysts

The Low Temperature Solvent-Free Aerobic Oxidation of Cyclohexene to Cyclohexane Diol over Highly Active Au/Graphite and Au/Graphene Catalysts

Functionalized silica nanoparticles for conversion of fructose to 5-hydroxymethylfurfural

Novel continuous process for methacrolein production in numerous droplet reactors

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