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Micro-structured packed bed reactors for solar photocatalysis: impacts of packing size and material on light harnessing

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Abstract

The application of photochemistry in larger scales relies on studies in photoreactor engineering. This report investigates the structural parameters of externally irradiated micro-structured photochemical packed bed reactors (PBRs). It reports on the impacts of the size and material of spherical packings on the reactor ability to harness incoming photons. Tubular reactors were built from borosilicate glass tubes of two outer diameters (20 and 30 mm) packed with soda-lime glass spheres of three average diameters (1.0, 3.0 and 6.0 mm), alumina spheres (6.0 mm dia.), and polished iron spheres (5.0 mm dia.). The aqueous-phase oxidation of benzoic acid by oxygen radicals generated by UV-A irradiation of nitrite ions was used as a model homogeneous photochemical reaction. It was observed that increasing the D/dp ratio for the narrower reactors led to improved specific yields (3.0 mm = 1.050), suggesting that intensification is possible in these reactors. Lastly, it was found that glass spheres can be replaced by alumina spheres with considerably little loss in the light-collection efficiency (ca. 20%), indicating an attractive pathway for fixed-bed solar photocatalysis.

Graphical abstract: Micro-structured packed bed reactors for solar photocatalysis: impacts of packing size and material on light harnessing

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Publication details

The article was received on 15 Aug 2018, accepted on 11 Dec 2018 and first published on 12 Dec 2018


Article type: Technical Note
DOI: 10.1039/C8PP00371H
Citation: Photochem. Photobiol. Sci., 2019, Advance Article
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    Micro-structured packed bed reactors for solar photocatalysis: impacts of packing size and material on light harnessing

    B. Ramos, A. Parisi Couri, S. Ookawara and A. C. Silva Costa Teixeira, Photochem. Photobiol. Sci., 2019, Advance Article , DOI: 10.1039/C8PP00371H

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