Slurry loop tubular membrane reactor for the catalysed aerobic oxidation of benzyl alcohol

Venezia, Baldassarre; Douthwaite, Mark; Wu, Gaowei; Sankar, Meenakshisundaram; Ellis, Peter R.; Hutchings, Graham J.; Gavriilidis, Asterios

doi:10.1016/j.cej.2019.122250

Cited by 11 publications

(7 citation statements)

References 52 publications

(86 reference statements)

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“…Aerobic oxidations of alcohols were performed using a 1 wt% Au-Pd/TiO 2 catalyst (Scheme 2). Other works report the use of this catalyst, 46,55,57 including Hutchings’ group, who found that the addition of Au to Pd nanocrystals enhanced the selectivity to aldehydes in the aerobic oxidation of alcohols, owing to the core-shell structure that Au creates with Pd. 57 The catalyst was supplied by Johnson Matthey and was prepared by co-impregnating HAuCl 4 ·3H 2 O (Johnson Matthey) and PdCl 2 (Johnson Matthey) onto TiO 2 (Evonik, P25) in a 1 : 19 Au-to-Pd weight ratio.…”

Section: Methodsmentioning

confidence: 99%

Aerobic oxidation of alcohols using a slurry loop membrane reactor

Venezia

Gavriilidis

2023

Green Chem.

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Section: Methodsmentioning

confidence: 99%

Aerobic oxidation of alcohols using a slurry loop membrane reactor

Venezia

Gavriilidis

2023

Green Chem.

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“…To ensure that gas delivery is disconnected from the liquid fluid dynamics in the annulus, membranes can be adopted. The use of membranes in flow reactors have gained popularity owing to their ability to provide control of exothermic gas‐liquid reactions, by distributing and dosing gaseous reactants while physically separating the two reacting phases 41–44 …”

Section: Introductionmentioning

confidence: 99%

“…The use of membranes in flow reactors have gained popularity owing to their ability to provide control of exothermic gasliquid reactions, by distributing and dosing gaseous reactants while physically separating the two reacting phases. [41][42][43][44] Wro nski et al demonstrated a Taylor-vortex membrane device that consisted of a cylindrical rotor inside a stationary tubular ceramic membrane. 45 Gas was pressurized outside the membrane and, depending on its pressure with respect to the liquid, diffusion or bubbling could be achieved.…”

Section: Introductionmentioning

confidence: 99%

Taylor‐vortex membrane reactor for continuous gas‐liquid reactions

2022

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A unique Taylor-vortex membrane reactor (TVMR) design for continuous gas-liquid reactions is presented in this work. The reactor consists of a cylindrical rotor inside a stationary concentric cylindrical vessel, and a flexible system of equispaced baffle rings surrounding the rotor. This restricts the annular cross section to a small gap between the baffles and the rotor, and divides the annulus into 18 mixing zones.The baffles support a 6 m long PFA tubular membrane that is woven around the rotor. At 4 mL/min inlet flow rate, the TVMR showed a plug-flow behavior and outperformed the unbaffled reactor, having 5-12 times lower axial dispersion. The continuous aerobic oxidation of benzyl alcohol was performed for 7 h using the Pd(OAc) 2 /pyridine catalyst in toluene at 100 C and 1.1 MPa oxygen pressure.A stable conversion of 30% was achieved with 85% benzaldehyde selectivity, and no pervaporation of organics into the gas phase.

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“…Dense, hydrophobic, gas-permeable membranes that show high liquid pressure breakthrough, like the Teflon AF-2400 have recently attracted considerable interest, due to its high permeability to light gases and its chemical inertness [30,31]. Teflon AF-2400 has been employed in a variety of gas-liquid and gas-liquid-solid reactions [32][33][34][35][36][37]. First introduced by the group of Ley [38], Teflon AF-2400 has been employed in a tube-in-tube configuration for both homogeneous and heterogeneous continuous hydrogenations using hydrogen pressurised outside and the reacting liquid flowing inside the membrane [33].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Teflon AF-2400 membrane reactor with adsorbed ex situ synthesized Pd-based nanoparticles for nitrobenzene hydrogenation

et al. 2021

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Among the unconventional approaches of supporting catalyst nanoparticles, the layer-by-layer assembly of polyelectrolyte multilayers for nanoparticle adsorption represents an easy and convenient method. It enables the deposition of singularly adsorbed nanoparticles and prevents them from aggregating. In this work, polydopamine was grafted on the internal surface of a Teflon AF-2400 tubular membrane, known for its excellent permeability to light gases and inertness to chemicals.Poly(acrylic acid) and poly(allylamine hydrochloride) were sequentially adsorbed on the modified surface of the membrane. Ex situ synthesised spherical, cubical, truncated octahedral palladium and dendritic platinum-palladium nanoparticles were then incorporated. The catalytic membranes were assembled in a tube-in-tube configuration and tested for 6 h of continuous nitrobenzene hydrogenation with molecular hydrogen. Stable conversion was observed for the truncated octahedral and dendritic nanoparticles, while a progressive deactivation was observed for the other nanoparticles. Due to their small size, the 3.7 nm spherical nanoparticles exhibited the highest reaction rate, 629 mol reactant /(mol catalyst h), while the cubical nanoparticles showed the highest turnover frequency, 3000 h -1 . The reactor concept developed in this work demonstrates how such a tool can serve as platform for conducting continuous multiphase catalytic reactions in flow using singularly adsorbed and finely tuned nanoparticles. The small volume of pressurised gas present in the tube-intube reactor offers improved process safety compared to batch, while the Teflon AF-2400 membrane provides control over the gas permeation during reaction.

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Slurry loop tubular membrane reactor for the catalysed aerobic oxidation of benzyl alcohol

Cited by 11 publications

References 52 publications

Aerobic oxidation of alcohols using a slurry loop membrane reactor

Aerobic oxidation of alcohols using a slurry loop membrane reactor

Taylor‐vortex membrane reactor for continuous gas‐liquid reactions

Catalytic Teflon AF-2400 membrane reactor with adsorbed ex situ synthesized Pd-based nanoparticles for nitrobenzene hydrogenation

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