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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: On the origin of the so-called nucleation loop during electropolymerization of conducting polymers. Dendritic aggregation of oligothiophene during desorption of 2,5-diiodothiophene multilayer and topography-induced alignment of oligothiophene nanofibers
- Abstracts: Electrical properties of niobium-doped titanium dioxide: 1: Defect disorder. Defect disorder of titanium dioxide
- Abstracts: Deprotonation of water in the presence of carboxylate and magnesium ions. Theoretical studies of solid-liquid interfaces: molecular interactions at the MgO(001)-water interface
- Abstracts: Changing reactivity of a bimetallic surface via oxidation: reactions of methanol on oxygen-covered Co thin films
- Abstracts: Effect of water on the electron transfer dynamics of 9-anthracenecarboxylic acid bound to TiO2 nanoparticles: demonstration of the Marcus inverted region