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Photocatalysis of gas-phase toluene using silica–titania composites: Performance of a novel catalyst immobilization technique suitable for large-scale applications

Paper ID Volume ID Publish Year Pages File Format Full-Text
47244 46464 2010 7 PDF Available
Title
Photocatalysis of gas-phase toluene using silica–titania composites: Performance of a novel catalyst immobilization technique suitable for large-scale applications
Abstract

Nanostructured silica–titania composites (STCs) were casted as large cylindrical pellets to be used in an annular packed-bed reactor. Their performance for the photocatalytic conversion of toluene was investigated as a function of relative humidity (RH) and space time. The 172 Å STCs were analyzed for their titania surface area (SA) available for reaction. Using silica as the titania support resulted in a loss of available titania SA of about 20%. However, casting the STCs in a large cylindrical pellet shape did not seem to further decrease the available titania SA. The effect of RH in the conversion of toluene was very significant. By increasing the RH from 13% to 90%, the conversion of toluene increased by 57%. Despite the large increase in RH, the catalyst still showed the yellowish coloration found at low RH, which is usually associated with deactivation. Toluene conversion increased with space time and steady-state conversions as high as 93% were achieved by increasing the space time up to 25 s. For all conditions studied neither external nor internal mass transfer resistances were found to be significant. The pseudo-first-order kinetics equation was successfully fit to the data and resulted in a rate constant of 0.12 s−1.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Steady-state toluene removals >90% achieved by photocatalysis using the STCs. ▶ Toluene removal is favored by increasing space time and relative humidity. ▶ Proposed catalyst immobilization technique is suitable for large-scale systems. ▶ About 20% of the available titania surface area is lost by using silica supports.

Keywords
Photocatalysis; Toluene; Titanium dioxide; Silica–titania composites; Annular reactor
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Photocatalysis of gas-phase toluene using silica–titania composites: Performance of a novel catalyst immobilization technique suitable for large-scale applications
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 99, Issues 1–2, 31 August 2010, Pages 329–335
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