Enhancing the performance of a supported titanium epoxidation catalyst by modifying the active center

Article Abstract:

A study was conducted to analyze the effects of catalytic activity in the epoxidation of cyclohexene supporting alkyl hydroperoxides when the surface of mesoporous silica was altered with either Ge(IV) or Sn(IV) before the grafting of tetracoordinated Ti(IV). Experimental results indicated that cumene hydroperoxide is an effective oxidizing agent for the epoxidation of cyclohexene. In addition, the high-surface-area mesoporous silica was more effective in promoting catalytically active Ti(IV) centers than a lower-surface-area amorphous silica analogue.

Surface chemistry, Cyclic compounds, Tin, Titanium, Epoxy compounds, Germanium, Cumene

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Imaging the pore structure and polytypic intergrowths in mesoporous silica

Article Abstract:

High-resolution transmission electron microscopic (HRTEM) studies were conducted on the typical mesoporous silica SBA-2. The role of SBA-2 as a catalyst support and the ability of HRTEM to characterize the polytypic and structural variants of microporous zeolites were investigated. A two-headed quaternary ammonium surfactants served as templates for the SBA-2 samples. A two-dimensional pore system was identified in SBA-2. However, the HRTEM was unable to reveal a detailed structural profile of the SBA-2 samples.

Porous materials, Porosity, Catalyst supports

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The identity in atomic structure and performance of active sites of heterogeneous and homogeneous, titanium-silica epoxidation catalysts

Article Abstract:

It has been established that the nature of the Ti(IV) active site in heterogeneous titano-silica epoxidation is identical to that of a Ti(IV)-centered site bound to soluble homogeneous silsesquoixane catalysts. This work has highlighted the key significance of accessibility to the four-coordinated Ti(IV) site.

Atomic structure

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