Size-Dependent Catalytic Activity of Oxo-Hydroxo Titanium Sub-Nanoislets Grafted on Organically Modified Mesoporous Silica

The reaction between titanium alkoxides, [Ti­(OR)4], and surface silanol groups is widely used to generate grafted oxo-hydroxo titanium species, whose size is difficult to control. Partial capping of the surface silanols in the presence of the masking pattern of self-repelling tetramethylammonium io...

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Bibliographic Details
Published in:Langmuir 2018-10, Vol.34 (43), p.12713-12722
Main Authors: Fang, Lin, Albela, Belén, Yang, Boting, Zheng, Yuting, Wu, Peng, He, Mingyuan, Bonneviot, Laurent
Format: Article
Language:English
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Summary:The reaction between titanium alkoxides, [Ti­(OR)4], and surface silanol groups is widely used to generate grafted oxo-hydroxo titanium species, whose size is difficult to control. Partial capping of the surface silanols in the presence of the masking pattern of self-repelling tetramethylammonium ions allows us to isolate surface silanol islets, on which isolated titanium ions and dimeric oxo titanium species can be generated up to 2 Ti/Si mol %. Above this loading, and up to ∼8 Ti/Si mol %, higher oligomers (trimers, hexamers, octamers, and so on) are formed, reaching the size obtained at much lower loadings (
ISSN:0743-7463
1520-5827
DOI:10.1021/acs.langmuir.8b01932