Ti-Doped SBA-15 Catalysts Used in Phenol Oxidation Reactions

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Title: Ti-Doped SBA-15 Catalysts Used in Phenol Oxidation Reactions
Authors: Almohammadi, GhadeerO'Modhrain, ColinKelly, SeanSullivan, James A.
Permanent link: http://hdl.handle.net/10197/11741
Date: 14-Jan-2020
Online since: 2020-11-26T09:59:17Z
Abstract: Two Ti-SBA-15 catalysts are synthesized using techniques that should either deposit Ti atoms specifically at the SBA-15 surface or allow Ti-containing species to exist at both the surface and within the bulk of SBA-15. The materials have been characterized by Fourier transform infrared (FTIR), Raman and UV visible spectroscopies, transmission electron microscopy, scanning electron microscopy/energy-dispersive X-ray spectrometry microscopies, and N2 physisorption experiments. They have been applied in the total oxidation of phenol under catalytic wet air oxidation (CWAO) conditions and using photo-and plasma promotion. The materials retain the structure of SBA-15 following the doping in both cases and Ti incorporation is confirmed. The nature of the incorporated Ti remains unclear-with evidence for anatase TiO2 (from Raman and UV vis analysis) and evidence for atomically dispersed Ti from FTIR. In terms of reactivity, the presence of Ti in the in situ-prepared catalyst improves reactivity in the photopromoted reaction (increasing conversion from 28 to 60%), while both Ti catalysts improve reactivity in the CWAO reaction (by 7% over the in situ catalyst and by 25% over the grafted material). The presence of Ti has no beneficial effect on conversion in the plasma-promoted reaction. Here, however, Ti does affect the nature of the oxidized intermediates formed during the total phenol oxidation.
Funding Details: Irish Research Council
Funding Details: KSA Ministry of Higher Education
Type of material: Journal Article
Publisher: American Chemical Society
Journal: ACS Omega
Volume: 5
Issue: 1
Start page: 791
End page: 798
Copyright (published version): 2019 American Chemical Society
Keywords: Wet air oxidationMesoporous silicaEpoxidationTi-SBA-15PhotodegradationPostsynthesisAnataseOxidation reactionsCatalystsAromatic compoundsOxidation materials
DOI: 10.1021/acsomega.9b03530
Language: en
Status of Item: Peer reviewed
ISSN: 2470-1343
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Appears in Collections:Chemistry Research Collection

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