Gas‐Phase Photooxidation: Reactors and Materials

Béchec, Mickaël Le; Costarramone, N.; Pigot, Thierry; Lacombe, Sylvie

doi:10.1002/ceat.201500349

Cited by 19 publications

(7 citation statements)

References 85 publications

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“…It can merely serve as a support. The strategy not only facilitates photocatalysis in liquid solution but also opens up the possibility of carrying out photocatalysis in the gas phase . As shown in Figure 7 , TiO 2 photocatalyst was immobilized on β‐SiC foam with a high open porosity structure, which benefited larger loading amount of TiO 2 and air flow during gas phase photocatalytic reaction …”

Section: Summary Of Existing Photocatalysis Reaction Typesmentioning

confidence: 99%

Photocatalysis: Basic Principles, Diverse Forms of Implementations and Emerging Scientific Opportunities

Zhu

Wang

2017

Advanced Energy Materials

595

298

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Photocatalysis promises a solution to challenges associated with the intermittent nature of sunlight which is considered as renewable and ultimate energy source to power activities on Earth. This review aims to provide a broad overview of the field. Insight into natural photosynthesis is discussed first, which provides a scientific basis for most efforts on photocatalysis. Afterwards, the details of four existing types of photocatalysis are presented, namely photosynthesis by plants, photosynthesis by microalgae, photocatalysis by suspension and photoelectrocatalysis. Detailed analyses of simple photocatalysts and integrated photocatalytic systems are followed to shed light on the different functionalities of different components in a working photocatalyst. Special attention is given to the roles played by surface and interface chemical phenomena. Lastly, perspectives on artificial photosynthesis are discussed briefly at the end.

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Section: Summary Of Existing Photocatalysis Reaction Typesmentioning

confidence: 99%

Photocatalysis: Basic Principles, Diverse Forms of Implementations and Emerging Scientific Opportunities

Zhu

Wang

2017

Advanced Energy Materials

595

298

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“…Heterogeneous sensitizers are diphasic with two appeals (pun intended). They are generally less prone to photobleaching compared to homogeneous sensitizers, − and they are easy to separate from solution after reaction; examples include polymer-supported RB, secoporphyrazine, and fullerenes. − Self-sensitized photooxygenation reactions are also known, − where the substrate absorbs visible light to generate 1 O 2 , which reacts on itself; two examples are described in section in the context of natural products and drug synthesis.…”

Section: Introductionmentioning

confidence: 99%

Using Singlet Oxygen to Synthesize Natural Products and Drugs

2016

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“…Typically, photocatalytic reactors for air purification are based on the immobilization of the catalyst onto a surface. [3] An ideal photoreactor for air purification should have (1) an appropriate light source irradiating the catalyst surface, (2) the catalyst coating should have a large surface area to ensure availability of many active sites, (3) high mass transfer and (4) low pressure drop. [4] The most widely used gas phase photocatalytic reactors are the flat plate reactor and the annular reactor.…”

Section: Introductionmentioning

confidence: 99%

Gas phase photocatalytic spiral reactor for fast and efficient pollutant degradation

Blommaerts

Asapu

Claes

et al. 2017

Chemical Engineering Journal

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Photocatalytic reactors for the degradation of gaseous organic pollutants often suffer from major limitations such as small reaction area, sub-optimal irradiation conditions and thus limited reaction rate. In this work, an alternative solution is presented that involves a glass tube coated on the inside with (silver-modified) TiO 2 and spiraled around a UVA lamp. First, the spiral reactor is coated from the inside with TiO 2 using an experimentally verified procedure that is optimized toward UV light transmission. This procedure is kept as simple as possible and involves a single casting step of a 1 wt% suspension of TiO 2 in ethanol through the spiral. This results in a coated tube that absorbs nearly all incident UV light under the experimental conditions used. The optimized coated spiral reactor is then benchmarked to a conventional annular photoreactor of the same outer dimensions and total catalyst loading over a broad range of experimental conditions. Although residence time distribution experiments indicate slightly longer dwelling of molecules in the spiral reactor, no significant difference in by-passing of gas between the spiral reactor and the annular reactor can be claimed. Acetaldehyde degradation efficiency of 100% is obtained with the spiral reactor for a residence time as low as 60 s, whereas the annular reactor could not achieve full degradation even at 1000 s residence time. In a final case study, addition of long-term stable silver nanoparticles, protected by an ultra-thin polymer shell applied via the layer-by-layer (LbL) method, to the spiral reactor coating is shown to double the degradation efficiency and provides an interesting strategy to cope with higher pollutant concentrations without changing the overall dimensions.

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Gas‐Phase Photooxidation: Reactors and Materials

Cited by 19 publications

References 85 publications

Photocatalysis: Basic Principles, Diverse Forms of Implementations and Emerging Scientific Opportunities

Photocatalysis: Basic Principles, Diverse Forms of Implementations and Emerging Scientific Opportunities

Using Singlet Oxygen to Synthesize Natural Products and Drugs

Gas phase photocatalytic spiral reactor for fast and efficient pollutant degradation

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