Light-Induced Synergistic Multidefect Sites on TiO2/SiO2 Composites for Catalytic Dehydrogenation

Saputera, W, Tahini, H, Sabsabi, M, Tan, T and Friedmann, D., et al., 2019, 'Light-Induced Synergistic Multidefect Sites on TiO2/SiO2 Composites for Catalytic Dehydrogenation', ACS Catalysis, vol. 9, no. 3, pp. 2674-2684.


Document type: Journal Article
Collection: Journal Articles

Title Light-Induced Synergistic Multidefect Sites on TiO2/SiO2 Composites for Catalytic Dehydrogenation
Author(s) Saputera, W
Tahini, H
Sabsabi, M
Tan, T
Friedmann, D., et al.,
Year 2019
Journal name ACS Catalysis
Volume number 9
Issue number 3
Start page 2674
End page 2684
Total pages 11
Publisher American Chemical Society
Abstract Here, we demonstrate that structural defects can induce catalytic reactivity in simple metal oxides to deliver cost-effective alternatives to noble metal group catalysts. We detail a strategy for introducing multiple defect sites in a binary TiO 2 -SiO 2 composite to invoke synergism for oxygen activation. Hydrogenation and UV light pretreatment were applied to generate two distinct and adjacent defect sites, Ti 3+ and silica-based nonbridging oxygen hole centers (NBOHC) - which work in unison to activate oxygen and oxidize formic acid under ambient conditions without light. The hydrogenation step was found to be crucial for rupturing Ti-O-Si bonds while first-principles calculations indicated that Si-doped TiO 2 lowered the energy barrier for oxygen activation and formic acid dehydrogenation on the defect sites. Activity lost during the reaction was recoverable by catalyst reillumination. Defective metal oxides represent an appealing prospect in the pursuit of simple and readily accessible catalyst materials.
Subject Powder and Particle Technology
Keyword(s) defects
dehydrogenation
nonbridging oxygen hole center (NBOHC)
oxygen activation
Ti 3+
TiO -SiO 2 2
UV light pretreatment
DOI - identifier 10.1021/acscatal.8b04891
Copyright notice © 2019 American Chemical Society
ISSN 2155-5435
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Created: Thu, 23 May 2019, 08:44:00 EST by Catalyst Administrator
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