The performance in a fluidized bed reactor of photocatalysts immobilized onto inert supports.pdf

The performance in a fluidized bed reactor of photocatalysts immobilized onto inert supports.pdf

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The performance in a fluidized bed reactor of photocatalysts immobilized onto inert supports

Catalysis Today 62 (2000) 175–187 The performance in a fluidized bed reactor of photocatalysts immobilized onto inert supports Roberto L. Pozzo, José L. Giombi, Miguel A. Baltanás ? , Alberto E. Cassano INTEC, Instituto de Desarrollo Tecnológico para la Industria Qu??mica, Universidad Nacional del Litoral and Consejo Nacional de Investigaciones Cient??ficas y Técnicas, Güemes 3450, S3000GLN Santa Fe, Argentina Abstract The performance of a model photocatalyst (Degussa P25), immobilized onto quartz sand using a dry/wet physical deposition method has been studied in a fluidized-bed reactor. A simple model substrate, dilute oxalic acid, was mineralized at room temperature. For comparison purposes, a slurry of the powdery P25 was also used. The reactor apparent captured power (PC) and the apparent quantum efficiency (ηVR ) were taken as the main performance criteria of both the free and the immobilized titania. The following variables were investigated: (a) degree of catalyst coverage on the support, (b) aggregation state of the catalyst particles, (c) texture of the supporting surface. Using increasing amounts of P25 deposited onto the support, the apparent captured power only grew moderately. Yet, the ηVR of the slurried P25 could not be matched even for conditions in which the amount of photocatalyst inside the photoreactor was eight times higher. Under those conditions the ηVR of the fluidized bed was 41% of that of the slurry, but the specific quantum efficiency was merely a 6% of that achievable with the free catalyst. With the employed deposition method a high degree of surface roughness of the support, and usage of thoroughly deionized water during the wetting step, are needed to prevent the coalescence of the titania during the immobilization. Otherwise, the catalytic performance becomes negligible. ? 2000 Elsevier Science B.V. All rights reserved. Keywords: Immobilized photocatalysts; Fluidized beds; Photocatalyst performance; Support treatment; Deposition met

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