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A comprehensive assessment of supported titania photocatalysts in a fluidized bed photoreactor: Photocatalytic activity and adherence stability

Paper ID Volume ID Publish Year Pages File Format Full-Text
48977 46536 2007 12 PDF Available
Title
A comprehensive assessment of supported titania photocatalysts in a fluidized bed photoreactor: Photocatalytic activity and adherence stability
Abstract

Titania (TiO2) was immobilized onto hydroxylated glass beads (HGB) via the thermal bonding and sol–gel coating methods. The photocatalytic activity and adherence stability of the prepared supported photocatalysts were studied in a fluidized bed photoreactor. P25 thermally bonded HGB was found to be more active than sol–gel coated HGB prepared with the same immobilization conditions, while both of them exhibited poor adherence stability, i.e., large amounts of immobilized TiO2 detached from HGB during the degradation. The adherence stability was improved with limited extents by increasing the calcination temperature or reducing the coverage of TiO2 on HGB, but either of these approaches resulted in lower activity. The poor adherence stability was ascribed to the fluid shear force and particle friction in fluidized bed, as well as the insufficient bonding between TiO2 and HGB in terms of the bonding mechanism.Hydroxylated quartz sands (HQS) and silica gel beads (SGB) were further studied and used as supports. Results have shown that the adherence stability was significantly improved with SGB but only slightly improved with HQS. Characterizations results showed that a coarser surface and more surface Si–OH groups could improve the adherence stability of supported TiO2 photocatalysts.

Keywords
Titania; Supported photocatalyst; Activity; Adherence stability
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A comprehensive assessment of supported titania photocatalysts in a fluidized bed photoreactor: Photocatalytic activity and adherence stability
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 71, Issues 3–4, 15 February 2007, Pages 151–162
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us