Capillary microphotoreactor packed with TiO2-coated glass beads: An efficient tool for photocatalytic reaction

Zhang, Suqi; Zhang, Jie; Sun, Jian; Tang, Zhiyong

doi:10.1016/j.cep.2019.107746

Cited by 40 publications

(17 citation statements)

References 29 publications

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“…In addition to difficulties of light distribution, since photoreactions are intrinsically quite fast, mass transfer limitations become a major issue in photoreactor design. Several reactor designs such as such as spinning disc reactor [12][13][14], monolith reactor [15][16][17], several microreactors [4,[18][19][20] and slurry systems including fluidized beds [21,22] or fountain reactor [23] have been employed in photochemistry to intensify both mass and photon transfer [24]. Modifications to existing reactor concepts and new reactor concepts are being tested to achieve high throughputs with photochemical reactions.…”

Section: [ ] =mentioning

confidence: 99%

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Overcoming mass and photon transfer limitations in a scalable reactor: Oxidation in an aerosol photoreactor

Kayahan

Urbani

Dambruoso

et al. 2021

Chemical Engineering Journal

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: [ ] =mentioning

confidence: 99%

“…( ) = 0 1 + 0 0 (19) where N(t) is the aerosol number concentration at time t, N 0 is the initial number concentration, K 0 is the coagulation coefficient…”

Section: Throughput Limits Due To Chemistry and Psty Calculationsmentioning

confidence: 99%

Overcoming mass and photon transfer limitations in a scalable reactor: Oxidation in an aerosol photoreactor

Kayahan

Urbani

Dambruoso

et al. 2021

Chemical Engineering Journal

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“…The degradation reaction was mainly limited by external mass transfer under our investigated conditions. It appeared that the reaction was in photon limited regime with high flow rate for the residence time <20 s, and was limited by mass transfer for the residence time >20 s. As shown in Figure the developed packed-bed reactor can shorten the light path and increase the photonic collection efficiency [138]. The packing structure can introduce the perturbation to the laminar flow, which minimize the transfer route of organic pollutant and then improve the mass transfer efficiency.…”

Section: Packed-bed Reactormentioning

confidence: 98%

Photocatalytic Reactor as a Bridge to Link the Commercialization of Photocatalyst in Water and Air Purification

et al. 2022

Catalysts

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The development of clean and sustainable teleology is vital to treat the critical environmental pollutants. In the last decade, the use of photocatalytic reactors has been widely reported for organic pollutants degradation. From photocatalysis’s application in environmental remediation, the primary technical issue to scientists is always the efficiency. The enhanced photocatalytic efficiency is mainly depended on the materials improvement. However, the design of photoreactors lags behind the development of photocatalysts, which strongly limit the widespread use of photocatalysis technology in environmental remediation. The nanoparticles separation, mass transfer limitation, and photonic efficiency have always been problematic and restrict the high photocatalytic efficiency of photoreactors. To overcome these bottleneck problems, the most popular or newfangled designs of photoreactors employed in air and water treatment has been reviewed. The purpose of this review is to systematize designs and synthesis of innovative TiO2-based photoreactors and provides detailed survey and discussion on the enhanced mechanism of photocatalytic performance in different TiO2-based photoreactors. The most studied photoreactors are the following: packed bed reactor, film reactor and membrane reactor, which have some limitations and advantages. A comprehensive comparison between the different photocatalytic performance of TiO2-based photoreactors is presented. This work aims to summarize the progress of TiO2-based photoreactors and provides useful information for the further research and development of photocatalysis for water and air purification.

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“…In addition, the packed bed photomicroreactor showed a good durability. The reactor performance dropped 17% after 6 h of operation and remained stable for the next 19.5 h [51]. Similarly, glass beads coated with photocatalysts were proved to increase the photoreaction rate twice in a luminescent solar concentrator (LSC) photomicroreactor with capillary channels [50].…”

Section: Mass Transportmentioning

confidence: 99%

“…Structures are commonly used to alleviate the mass transport effects. Catalysts are usually coated on beads [15,50,51], monoliths [52][53][54], or foams [55]. Beads coated with catalyst are often used in packed bed photoreactors.…”

Section: Mass Transportmentioning

confidence: 99%

Dawn of a new era in industrial photochemistry: the scale-up of micro- and mesostructured photoreactors

Kayahan

Jacobs

Braeken³

et al. 2020

Beilstein J. Org. Chem.

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Photochemical activation routes are gaining the attention of the scientific community since they can offer an alternative to the traditional chemical industry that mainly utilizes thermochemical activation of molecules. Photoreactions are fast and selective, which would potentially reduce the downstream costs significantly if the process is optimized properly. With the transition towards green chemistry, the traditional batch photoreactor operation is becoming abundant in this field. Process intensification efforts led to micro- and mesostructured flow photoreactors. In this work, we are reviewing structured photoreactors by elaborating on the bottleneck of this field: the development of an efficient scale-up strategy. In line with this, micro- and mesostructured bench-scale photoreactors were evaluated based on a new benchmark called photochemical space time yield (mol·day−1·kW−1), which takes into account the energy efficiency of the photoreactors. It was manifested that along with the selection of the photoreactor dimensions and an appropriate light source, optimization of the process conditions, such as the residence time and the concentration of the photoactive molecule is also crucial for an efficient photoreactor operation. In this paper, we are aiming to give a comprehensive understanding for scale-up strategies by benchmarking selected photoreactors and by discussing transport phenomena in several other photoreactors.

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Capillary microphotoreactor packed with TiO2-coated glass beads: An efficient tool for photocatalytic reaction

Cited by 40 publications

References 29 publications

Overcoming mass and photon transfer limitations in a scalable reactor: Oxidation in an aerosol photoreactor

Overcoming mass and photon transfer limitations in a scalable reactor: Oxidation in an aerosol photoreactor

Photocatalytic Reactor as a Bridge to Link the Commercialization of Photocatalyst in Water and Air Purification

Dawn of a new era in industrial photochemistry: the scale-up of micro- and mesostructured photoreactors

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