Decomposition of gaseous formaldehyde in a photocatalytic reactor with a parallel array of light sources

Shiraishi, Fumihidé; Toyoda, Kentaro; Miyakawa, Hiromitsu

doi:10.1016/j.cej.2005.09.008

Cited by 31 publications

(21 citation statements)

References 8 publications

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“…Shiraishi et al [50] developed a high-performance photocatalytic reactor with a parallel array of nine light sources for photocatalytic decomposition of gaseous formaldehyde at a very low concentration using amorphous TiO 2 . The experimental result indicateed that this photocatalytic reactor could rapidly decompose formaldehyde completely.…”

Section: Uv-light Irradiated Catalystsmentioning

confidence: 99%

Photocatalytic oxidation for degradation of VOCs

Lin¹,

Chai²,

Zhao³

et al. 2013

OJIC

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Volatile organic compounds (VOCs) are the major group of indoor air pollutants, which significantly impact indoor air quality (IAQ) and influence human health. Photocatalytic oxidation (PCO) is a cost-effective technology for VOCs removal, compared with adsorption, biofiltration, or thermal catalysis method. Development of active photocatalyst systems is crucial for the PCO reaction. In this paper, the catalyst systems for photocatalysis under UV and visible light were discussed and the kinetics of photocatalytic oxidation was presented in order that some key influencing factors (relative huminity, light intensity, initial contaminant concentration and mass of catalyst) had also been studied. In addition, the future research directions were also presented in this paper.

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Section: Uv-light Irradiated Catalystsmentioning

confidence: 99%

Photocatalytic oxidation for degradation of VOCs

Lin¹,

Chai²,

Zhao³

et al. 2013

OJIC

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show abstract

“…Ending reaction 8 in Table 2 is a generic termination step for the active oxidizing species, where M is an inert species or body that can consume hydroxyl radicals. Formic acid (HCOOH) is an intermediate product that has a fast rate of disappearance compared to its formation rate and presents concentrations three orders of magnitude lower than those of HCHO [ 6 ]. In addition, a balance for adsorption sites on the catalyst surface for HCHO and water makes it possible to relate surface to bulk concentrations.…”

Section: Application: Step-by-step Design and Optimization Of A Phmentioning

confidence: 99%

“…The effects in human health of a poor air quality in a room can range from headaches to nausea, dizziness, eye and nose irritations, dry cough and tiredness [ 4 ], a situation known as sick building syndrome (SBS). This syndrome is usually associated with the presence of volatile organic compounds (VOCs) in very low concentrations [ 1 , 5 , 6 ].…”

Section: Introduction and Scopementioning

confidence: 99%

Integral Design Methodology of Photocatalytic Reactors for Air Pollution Remediation

2017

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An integral reactor design methodology was developed to address the optimal design of photocatalytic wall reactors to be used in air pollution control. For a target pollutant to be eliminated from an air stream, the proposed methodology is initiated with a mechanistic derived reaction rate. The determination of intrinsic kinetic parameters is associated with the use of a simple geometry laboratory scale reactor, operation under kinetic control and a uniform incident radiation flux, which allows computing the local superficial rate of photon absorption. Thus, a simple model can describe the mass balance and a solution may be obtained. The kinetic parameters may be estimated by the combination of the mathematical model and the experimental results. The validated intrinsic kinetics obtained may be directly used in the scaling-up of any reactor configuration and size. The bench scale reactor may require the use of complex computational software to obtain the fields of velocity, radiation absorption and species concentration. The complete methodology was successfully applied to the elimination of airborne formaldehyde. The kinetic parameters were determined in a flat plate reactor, whilst a bench scale corrugated wall reactor was used to illustrate the scaling-up methodology. In addition, an optimal folding angle of the corrugated reactor was found using computational fluid dynamics tools.

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“…While the HCHO concentration is at a typical indoor level, the film-diffusional resistance at the interface of gas phase and catalyst film becomes very large, leading to remarkable decrease of HCHO degradation rate in the UV 254 nm photocatalysis [22]. Until now, it is still a great challenge for UV 254 nm photocatalysis using semiconductor films to effectively decompose low concentration HCHO, while the gas residence time becomes short enough to several seconds [22][23][24]. In this study, the results indicate that the VUV photocatalysis cannot only rapidly decompose HCHO vapor with low concentration but also avoid the deactivation of the photocatalysts.…”

Section: Comparison Of Hcho Degradation Inmentioning

confidence: 99%

Simultaneous Elimination of Formaldehyde and Ozone Byproduct Using Noble Metal Modified TiO₂Films in the Gaseous VUV Photocatalysis

Zhang

2012

International Journal of Photoenergy

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Simultaneous removal of low concentration formaldehyde (HCHO) and ozone byproduct was investigated in the gaseous VUV (vacuum ultraviolet) photocatalysis by using noble metal modified TiO2films. Noble metal (Pt, Au, or Pd) nanoparticles were deposited on TiO2films with ultrafine particle size and uniform distribution. Under 35 h VUV irradiation, the HCHO gas (ca. 420 ppbv) was dynamically degraded to a level of 10~45 ppbv without catalyst deactivation, and over 50% O3byproduct wasin situdecomposed in the reactor. However, under the same conditions, the outlet HCHO concentration remained at 125~178 ppbv in the O3+ UV254 nmphotocatalysis process and 190~260 ppbv in the UV254 nmphotocatalysis process. And the catalyst deactivation also appeared under UV254 nmirradiation. Metallic Pt or Au could simultaneously increase the elimination of HCHO and ozone, but the PdO oxide seemed to inhibit the HCHO oxidation in the UV254 nmphotocatalysis. Deposition of metallic Pt or Au reduces the recombination of h+/e−pairs and thus increases the HCHO oxidation and O3reduction reactions. In addition, adsorbed O3may be partly decomposed by photogenerated electrons trapped on metallic Pt or Au nanoparticles under UV irradiation.

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Decomposition of gaseous formaldehyde in a photocatalytic reactor with a parallel array of light sources

Cited by 31 publications

References 8 publications

Photocatalytic oxidation for degradation of VOCs

Photocatalytic oxidation for degradation of VOCs

Integral Design Methodology of Photocatalytic Reactors for Air Pollution Remediation

Simultaneous Elimination of Formaldehyde and Ozone Byproduct Using Noble Metal Modified TiO₂Films in the Gaseous VUV Photocatalysis

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Decomposition of gaseous formaldehyde in a photocatalytic reactor with a parallel array of light sources

Cited by 31 publications

References 8 publications

Photocatalytic oxidation for degradation of VOCs

Photocatalytic oxidation for degradation of VOCs

Integral Design Methodology of Photocatalytic Reactors for Air Pollution Remediation

Simultaneous Elimination of Formaldehyde and Ozone Byproduct Using Noble Metal Modified TiO2Films in the Gaseous VUV Photocatalysis

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Product

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Simultaneous Elimination of Formaldehyde and Ozone Byproduct Using Noble Metal Modified TiO₂Films in the Gaseous VUV Photocatalysis