Photoproduction of hydrogen in microreactors: Catalytic coating or slurry configuration?

Chausse, Víctor; Llorca, Jordi

doi:10.1016/j.cattod.2020.08.021

Cited by 5 publications

(8 citation statements)

References 33 publications

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“…Recently, the activity of microreactors with the slurry catalyst and catalytic wall coatings in the photogeneration of hydrogen from the water−ethanol mixture has been studied (Table 2, entry 10). 97 Au/TiO 2 photocatalyst was either dispersed in the reaction mixture or coated onto the quartz microreactor wall (Figure 9), with the inert Ar carrier gas being used to create a gas−liquid(−solid) slug flow and facilitate the transfer of hydrogen from liquid to gas. Under UV irradiation, the photoactivity in terms of the hydrogen production rate (i.e., via ethanol dehydrogenation) based on the photocatalyst amount was found to be ∼3.5 times higher in the coating configuration than the slurry configuration, due to the opacity of the slurry (especially at high catalyst loadings) that tended to limit the photon transfer.…”

Section: Reaction Applicationmentioning

confidence: 99%

“…Recently, the activity of microreactors with the slurry catalyst and catalytic wall coatings in the photogeneration of hydrogen from the water–ethanol mixture has been studied (Table , entry 10) . Au/TiO 2 photocatalyst was either dispersed in the reaction mixture or coated onto the quartz microreactor wall (Figure ), with the inert Ar carrier gas being used to create a gas–liquid(−solid) slug flow and facilitate the transfer of hydrogen from liquid to gas.…”

Section: Continuous Solid Particle Flow For Chemical Conversions In M...mentioning

confidence: 99%

Section: Continuous Solid Particle Flow For Chemical Conversions In M...mentioning

confidence: 99%

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Continuous Solid Particle Flow in Microreactors for Efficient Chemical Conversion

Zong

Yue

2022

Ind. Eng. Chem. Res.

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The incorporation of flowing nanoparticles or microparticles for use in catalysis as well as in the enhancement of mass transfer in microreactors opens a new avenue for chemical process intensification. In this work, the recent application of handling suspended solid particles in microreactors for carrying out efficient chemical conversions is reviewed, including the use of colloidal suspensions, Pickering emulsions, and catalyst slurries. Emphasis is laid on the effect of the presence of solid particles on the microflow characteristics, mass transfer property, and reaction enhancement, especially in multiphase fluid systems as the most frequently used one in microreactors. A future perspective regarding the potential application of such microreactor systems as well as challenges, especially related to stable flow operation and catalyst recycling, is further provided.

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Section: Reaction Applicationmentioning

confidence: 99%

Section: Continuous Solid Particle Flow For Chemical Conversions In M...mentioning

confidence: 99%

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Continuous Solid Particle Flow in Microreactors for Efficient Chemical Conversion

Zong

Yue

2022

Ind. Eng. Chem. Res.

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“…Chausse and Llorca 216 purchased a quartz microreactor containing 28 microchannels carved on the surface with the dimensions of 500 µm × 500 µm × 10.5 cm to a volume ratio of 6000 m 2 m −3 . The microreactor was used to compare the effect of photocatalyst configuration on hydrogen production in the microfluidic system.…”

Section: Heterogeneous Reactions In Microreactorsmentioning

confidence: 99%

Heterogeneous Microfluidic Reactors: A Review and an Insight of Enzymatic Reactions

2022

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Heterogeneous reactions are considered the heart of chemical synthesis with numerous industrial applications due to their high conversion rates and low reaction time. On the other hand, the performance of heterogeneous reactions suffers from several drawbacks such as lower product selectivity and high mass transfer resistance that, in many cases, reduce the reaction rate. The efficiency of various conventional mixing techniques in heterogeneous reactors is believed to play a critical role in controlling the product quality and mass transfer rates besides other essential factors. Microfluidics technology provides a unique opportunity to revisit many established heterogeneous reaction processes to optimize and understand the reaction mechanisms. The unique flow conditions in microflow systems provide an excellent platform for exploring the effect of high‐precision micromixing techniques on reaction rates and productivities. Recent advances in microreactor technology in general and specifically heterogeneous reactions in microflow systems with an insight on the enzymatic reactions in microreactors are reviewed.

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“…It is also important to highlight the relevance of performing photocatalytic studies in microreactors in order to standardize results, compare materials, minimize reactant waste, screen photocatalysts, and study various reactor-catalyst configurations. 51…”

Section: Photocatalytic Reactor Performancementioning

confidence: 99%

Three-Dimensional Printing of Acrylonitrile Butadiene Styrene Microreactors for Photocatalytic Applications

Cabrera

Pellejero

Oroz-Mateo

et al. 2020

Ind. Eng. Chem. Res.

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Miniaturization is a key aspect for many technological applications and the use of microreactors is an excellent solution for the intensification of chemical processes for a variety of applications. However, standard microfabrication requires large facilities and intricate fabrication protocols, and consequently it is not easily available, generally resulting in high production costs. Herein, we present a very cheap, fast and easy microreactor design for photocatalytic applications based on direct fused filament 3D printing as a facilitating and 2 widespread technology. The microreactor consists of three bodies directly printed in ABS (Acrylonitrile Butadiene Styrene): a main body with a serpentine microchannel pattern where the photocatalyst is placed, a top holder with a transparent polymer window, and a base to clamp the parts. Several microreactor units were coated with TiO 2 doped with Cu (2.4 wt.%) nanoparticles synthesized by FSP (Flame Spray Pyrolysis) and tested for the photocatalytic degradation of two water pollutants showing excellent performance. INTRODUCTIONGreen chemistry is a route toward production sustainability, and microreactors are one of the tools available to make it possible, thanks to their enhanced mass and heat transport properties in comparison to conventional reactors. 1-3 A microreactor is a device with interconnected microchannels in which a chemical reaction is carried out. The inner characteristic dimensions are typically below 1 mm. This miniaturization mainly offers high surface-to-volume ratio, controllable interaction between reactants and mass diffusion, lower energy consumption, excellent heat exchange and temperature control, minimization of light loss in photoreactions, better product selectivity, and the opportunity to integrate processes in an automated manner. [4][5][6] These features make microreactors an ideal solution to handle multiple reaction systems, [7][8][9][10] especially in heterogeneous photocatalysis, where a close interaction between the incident light, catalyst and reactants is much needed and hardly achieved in conventional systems. 11,12 Microreactors, like other microfluidic devices, can be manufactured by different techniques such as standard photolithography, soft lithography, micromolding or laser ablation, and a large variety of construction materials are available, such as silicon, glass, polymers, and metals. 13,14 Mainly, polydimethylsiloxane (PDMS) elastomer has been used as construction material due to its outstanding properties of biocompatibility, flexibility, and optical transparency in the UV-Vis

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Photoproduction of hydrogen in microreactors: Catalytic coating or slurry configuration?

Cited by 5 publications

References 33 publications

Continuous Solid Particle Flow in Microreactors for Efficient Chemical Conversion

Continuous Solid Particle Flow in Microreactors for Efficient Chemical Conversion

Heterogeneous Microfluidic Reactors: A Review and an Insight of Enzymatic Reactions

Three-Dimensional Printing of Acrylonitrile Butadiene Styrene Microreactors for Photocatalytic Applications

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