Flow field investigation in a photocatalytic reactor for air treatment (Photo-CREC–air)

Castrillón, S. Romero-Vargas; Ibrahim, Hanan S.; Lasa, Hugo de

doi:10.1016/j.ces.2005.11.039

Cited by 25 publications

(33 citation statements)

References 33 publications

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“…During the past few years, numerous photoreactor configurations for PCO (Photocatalytic Oxidation) have been reported in the literature, including fixed-bed reactors [20][21][22], fluidized-bed reactors [23,24], coated honeycomb monolith reactors [25][26][27], fixed powder layer reactors [28,29], annular coated reactors [11,30], and annular mesh-coated Venturi-reactors [2,12,13]. These reactor configurations are relevant given that they determine the PCO process.…”

Section: Commercial Tio2-based Photocatalystsmentioning

confidence: 99%

“…In further steps and based on preliminary experimentation and CFD available tools, the annular mesh-coated Venturi-reactor was upgraded [2,9,13,16,31]. The redesigned PCAR, as shown in Figure 6, is a 55.1 L scaled-up reactor with a closed-loop unit that provides an effective interaction between the fluid and the solid phase.…”

Section: Experimental Photocatalytic Air Reactors For the Photodegradation Of Organic Pollutantsmentioning

confidence: 99%

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Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses

Escobedo

Lasa

2020

Catalysts

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Photocatalysis for air treatment or photocatalytic oxidation (PCO) is a relatively new technology which requires titanium dioxide (TiO2) and a source of light (Visible or near-UV) to degrade pollutants contained in air streams. Present approaches for the photodegradation of indoor pollutants in air streams aim to eliminate volatile organic compounds (VOCs) and viruses, which are both toxic and harmful to human health. Photocatalysis for air treatment is an inexpensive and innovative green process. Additionally, it is a technology with a reduced environmental footprint when compared to other conventional air treatments which demand significant energy, require the disposal of used materials, and release CO2 and other greenhouse gases to the environment. This review discusses the most current and relevant information on photocatalysis for air treatment. This article also provides a critical review of (1) the most commonly used TiO2-based semiconductors, (2) the experimental syntheses and the various photocatalytic organic species degradation conversions, (3) the developed kinetics and computational fluid dynamics (CFD) and (4) the proposed Quantum Yields (QYs) and Photocatalytic Thermodynamic Efficiency Factors (PTEFs). Furthermore, this article contains important information on significant factors affecting the photocatalytic degradation of organic pollutants, such as reactor designs and type of photoreactor irradiation. Overall, this review describes state-of-the-art photocatalysis for air treatment to eliminate harmful indoor organic molecules, reviewing as well the potential applications for the inactivation of SARS-CoV2 (COVID-19) viruses.

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Section: Commercial Tio2-based Photocatalystsmentioning

confidence: 99%

Section: Experimental Photocatalytic Air Reactors For the Photodegradation Of Organic Pollutantsmentioning

confidence: 99%

Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses

Escobedo

Lasa

2020

Catalysts

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“…Mohseni and Taghipour (Mohseni and Taghipour, 2004) used experimental and CFD modeling to investigate the flow field and the photocatalytic degradation of vinyl chloride in an annular reactor and reported good agreement of conversion values between the model to experimental results. Castrillion and de Lasa (Romero-Vargas Castrillón et al, 2006) used CFD to simulate the flow field in a photo-CREC reactor. The simulated flow field enabled them to uniformize mass flow and contact time distributions within the reactor.…”

Section: Introductionmentioning

confidence: 99%

Understanding the influence of media geometry on the degradation of acrylonitrile: Experimental and CFD analysis

Whyte

Subrenat

Raillard

et al. 2019

Chemical Engineering Science

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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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“…Although many studies have investigated the photocatalytic oxidation of gasphase volatile organic compounds by using TiO 2 , most of them focused on reaction rate and reactor performance, as well as on the identification of reaction by-products [12][13][14][15][16]. Different photoreactor configurations are reported in the references [8,[17][18][19][20][21][22]. Generally, the photocatalytic reactors in use for air treatment can be categorized according to: (a) gas flow geometry (tubular, annular, flat plate), (b) type of their light sources or (c) the way by which the photocatalyst is introduced into the system [23].…”

Section: Introductionmentioning

confidence: 99%

“…However, there is still a lack of mathematical models that can be applied to photocatalytic reactor design and scale-up. Different mathematical models are applied depending on photoreactor configuration, such as fixed bed annular reactor [24][25][26][27][28], batch reactor [18,[29][30][31], plane plate reactor [28,[32][33][34], honeycomb monolith reactor [17], microchannel reactor [35], annular Venturi reactor [18], etc.…”

Section: Introductionmentioning

confidence: 99%

Modelling of an annular photocatalytic reactor

Marečić

Jović

Kosar

et al. 2011

Reac Kinet Mech Cat

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This work deals with the photocatalytic oxidation of toluene at room temperature and atmospheric pressure in the gas phase. The differential equations of the reactor model are solved numerically with simultaneous estimation of the model parameters. Estimation of the kinetic data is performed using a modified differential method of data analysis and a Nelder-Mead method of nonlinear optimization for parameter estimation. The reaction is performed in an annular photoreactor using UVA black light blue fluorescent lamp. The experiments are carried out at different total flow rates of the reaction feed (20-160 cm 3 min -1 ), two different inlet concentrations of toluene (2.67 and 5.24 g m -3 ) and at constant relative humidity (25%). A good agreement between the experimental data and theoretical predictions is obtained, supporting the applicability of the proposed models to describe the investigated process performed in laboratory annular photoreactor. List of symbols aGeometric surface area (m 2 ) A R Surface area of reactor (annulus) cross-section (m 2 ) C A Toluene concentration (g m -3 ) C A,0 Inlet toluene concentration (g m -3 ) C A,g Toluene concentration in the fluid phase (g m -3 ) C A,s Toluene concentration at the solid phase (g m -3 ) Average toluene concentration in the fluid phase (g m -3 ) D A Molecular diffusion coefficient of toluene in air (m 2 s -1 ) k A Reaction rate constant (min -1 ) k g Interphase mass transfer coefficient (m h -1 ) N Number of the experimental points (dimensionless) rRadial reactor coordinate (m) r A Reaction rate (mol h -1 kg -1 ) R Diameter of reactor annulus (m) SD Root of the mean square deviation (dimensionless) uSuperficial fluid velocity (m h -1 ) u m Mean superficial fluid velocity (m h -1 ) v 0Volume flow rate (m 3 h -1 ) V Reactor volume (m 3 ) X A Toluene conversion (dimensionless) zAxial reactor coordinate (m) Z Length of the reactor (m)Greek letters j Ratio of inner and outer reactor diameter (dimensionless) s Space time (min) Dimensionless parametersRe Reynolds number (dimensionless) Sc Schmidt number (dimensionless) Sh Sherwood number (dimensionless)

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Flow field investigation in a photocatalytic reactor for air treatment (Photo-CREC–air)

Cited by 25 publications

References 33 publications

Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses

Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses

Understanding the influence of media geometry on the degradation of acrylonitrile: Experimental and CFD analysis

Modelling of an annular photocatalytic reactor

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