Beyond TS-1: Background and recent advances in the synthesis of Ti-containing zeolites

Millini, Roberto; Bellussi, Giuseppe; Pollesel, Paolo; Rizzo, Caterina; Perego, Carlo

doi:10.1016/j.micromeso.2023.112660

Microporous and Mesoporous Materials

2023

DOI: 10.1016/j.micromeso.2023.112660

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Beyond TS-1: Background and recent advances in the synthesis of Ti-containing zeolites

Roberto Millini

Giuseppe Bellussi

Paolo Pollesel

et al.

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2024

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Simple Molecular Synthetic Approach to Dinuclear Titanium Sites in Ti-Containing Silica-Based Catalysts

Hikino,

Kawakubo,

Matsuno

et al. 2024

Chem. Mater.

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Ti-containing silica-based catalysts are widely used for various organic oxidation reactions. Recently, increasing attention has been paid to the catalytic role of dinuclear (SiO) 3 Ti−O−Ti(OSi) 3 sites in titanosilicate zeolite TS-1. A promising experimental approach for elucidating the active sites is to use model compounds with dinuclear Ti sites. In this study, we report the synthesis and catalytic properties of a μ-oxo-bridged dinuclear titanosiloxane compound with a (SiO) 3 Ti−O−Ti(OSi) 3 site. A Ti-containing cage siloxane compound ( i Bu 7 Si 7 O 12 )TiO i Pr (mononuclear Ti-polyhedral oligomeric silsesquioxane (POSS)) is prepared by the reaction of incompletely condensed POSS with titanium tetraisopropoxide. Then, it is converted to the dinuclear species ( i Bu 7 Si 7 O 12 ) 2 Ti 2 (μ-O) (dinuclear Ti-POSS) by the simple hydrolytic condensation of the TiO i Pr groups. The addition of H 2 O 2 to dinuclear Ti-POSS leads to the formation of a bishydroperoxo complex, as revealed by Ti K-edge X-ray absorption fine structure analysis. Dinuclear Ti-POSS possesses high catalytic activity in the cyclohexene epoxidation reaction, indicating that the (SiO) 3 Ti−O−Ti(OSi) 3 sites can function as efficient catalytically active sites. These findings contribute to the comprehension of the catalytic properties exhibited by dinuclear titanium sites within titanosilicate zeolite catalysts.

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Simple Molecular Synthetic Approach to Dinuclear Titanium Sites in Ti-Containing Silica-Based Catalysts

Hikino,

Kawakubo,

Matsuno

et al. 2024

Chem. Mater.

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Beyond TS-1: Background and recent advances in the synthesis of Ti-containing zeolites

Cited by 1 publication

References 185 publications

Simple Molecular Synthetic Approach to Dinuclear Titanium Sites in Ti-Containing Silica-Based Catalysts

Simple Molecular Synthetic Approach to Dinuclear Titanium Sites in Ti-Containing Silica-Based Catalysts

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