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Room-temperature catalytic oxidation of benzo(a)pyrene by Ce-SBA-15 supported active CeSiO4 phase

Paper ID Volume ID Publish Year Pages File Format Full-Text
46267 46436 2012 7 PDF Available
Title
Room-temperature catalytic oxidation of benzo(a)pyrene by Ce-SBA-15 supported active CeSiO4 phase
Abstract

A series of cerium-incorporated SBA-15 mesoporous materials were prepared through direct hydrothermal synthesis method, which was characterized by PXRD, N2 physisorption and TEM measurements. The low-angle PXRD and N2 physisorption results show the cerium successfully incorporated into the framework of SBA-15. The large angle PXRD results indicate that Ce-SBA-15 mesoporous materials supported CeSiO4 phase was in situ synthesized by adjusting pH to 6 with anhydrous triethylamine, and then calcined in air at 550 °C. The room-temperature adsorption behaviors of SBA-15 and Ce-SBA-15 materials for benzo(a)pyrene in cyclohexane solutions were investigated. Interestingly, Ce-SBA-15 materials reveal good catalytic performance for room-temperature oxidation benzo(a)pyrene to corresponding quinone through a radical oxidation mechanism, attributable to in situ forming active CeSiO4 phase which was supported in Ce-SBA-15 material. The benzo(a)pyrene transfer to quinone by CeSiO4 phase leads to higher adsorption capacity owing to higher affinity of quinone with mesoporous channels, as a result, some Ce-SBA-15 materials exhibit higher adsorption capacity for benzo(a)pyrene than SBA-15 material. The radical oxidation mechanism was demonstrated by EPR and the interception effect of a radical scavenger, TEMPO. The quinone-type molecule was identified by photoluminescence, ESI-MS, IR and NMR.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► CeSiO4 phase was in situ formed during synthesis of Ce-SBA-15 mesoporous materials. ► Ce-SBA-15 possess of higher adsorption capacity for BaP than SBA-15. ► BaP can be transferred to corresponding quinone by CeSiO4 at room temperature. ► BaP transfer to corresponding quinone was ascribed to radical oxidation mechanism.

Keywords
Ce-SBA-15; CeSiO4; Benzo(a)pyrene; Room-temperature oxidation
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Room-temperature catalytic oxidation of benzo(a)pyrene by Ce-SBA-15 supported active CeSiO4 phase
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 127, 30 October 2012, Pages 105–111
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