Solid-Phase Immobilization of a New Epoxidation Catalyst

Krijnen, S Simon; Abbenhuis, Hendrikus C. L.; Hanssen, Rob W. J. M.; Hooff, J.H.C. van; Santen, Rutger A. van

doi:10.1002/(sici)1521-3773(19980216)37:3<356::aid-anie356>3.0.co;2-5

Cited by 85 publications

(34 citation statements)

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“…After pioneering works using Ti-zeolites such as TS-1 [3], mesoporous mixed oxide catalysts with larger pores (e.g., Ti substituted mesoporous silica) were developed to expand its applicability to this reaction [4][5][6][7][8][9][10]. Another approach has been done by immobilization of active molecular complexes (e.g., Ti, Mo, Mn, W) onto heterogeneous supports via organic anchors [11][12][13]. Most of the catalyst systems above mentioned utilised porous siliceous oxide or other metal oxide supports (e.g., MCM-41 and SBA-15), which caused drawbacks in catalytic activity and selectivity.…”

Section: Introductionmentioning

confidence: 99%

Remarkable effect of ordered mesoporous carbon support in tantalum oxide-catalyzed selective epoxidation of cyclooctene

Lin

Hara

Okubo

et al. 2011

Catalysis Communications

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The olefin epoxidation is one of the most important reactions in chemical industry. Metal oxide supports often cause drawbacks in catalytic activity and selectivity, which has been overcome by introducing hydrophobic organic groups onto the oxide supports. The present study utilizes ordered mesoporous carbon (CMK-3 and CMK-1) as structurally defined hydrophobic catalyst support. Well-dispersed tantalum oxides supported on the ordered mesoporous carbon were prepared. Their application in catalytic epoxidation of cyclooctene demonstrates that the tantalum oxide catalysts on the ordered mesoporous carbon supports show higher performances than those of the catalysts supported on activated carbon and ordered mesoporous silica SBA-15.

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Section: Introductionmentioning

confidence: 99%

Remarkable effect of ordered mesoporous carbon support in tantalum oxide-catalyzed selective epoxidation of cyclooctene

Lin

Hara

Okubo

et al. 2011

Catalysis Communications

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“…[132] However, functionalized Al-MCM-41 is prone to leaching and requires treatment with a silylating agent prior to catalysis to prevent this. [133] The significantly quicker adsorption onto aluminium-doped MCM-41 suggests that, in addition to entropic considerations, polarity influences adsorption characteristics of the host material. XPS analysis suggests that this rapid adsorption prevents a homogeneous distribution of the complex inside the host, instead higher concentrations are found in the outer regions of the channels.…”

Section: Noncovalently Bound Metal Complexesmentioning

confidence: 99%

An Overview of Zeolite, Zeotype and Mesoporous Solids Chemistry: Design, Synthesis and Catalytic Properties

Maschmeyer

Water

2006

Catalysts for Fine Chemical Synthesis

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“…As one preparation method of organic-inorganic hybrid catalysts with well-defined structures of the active sites, immobilization onto other materials, polymerization, or incorporation into the sol-gel matrices of metal-containing silsesquioxanes is considered to be promising [42][43][44][45]48,49,51,52,[54][55][56]. This section deals with the attempts for the preparation of organic-inorganic hybrid materials for heterogeneous or recyclable homogeneous catalysts by us and others.…”

Section: Preparation Of Immobilized and Polymeric Catalysts Utilizingmentioning

confidence: 99%

“…The use of MCM-41 mesoporous silica is essential to prevent leaching of 4¢ during the reaction, while from the usual amorphous silica significant loss of the catalyst molecules was observed [43,44].…”

Section: Preparation Of Immobilized and Polymeric Catalysts Utilizingmentioning

confidence: 99%

Preparation of Novel Materials for Catalysts Utilizing Metal-Containing Silsesquioxanes

Wada

Mitsudo

2005

Catal Surv Asia

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Recent progress of the preparation of novel materials for catalysts utilizing metal-containing silsesquioxanes are reviewed in the following categories: (i) activities of vanadium or titanium-containing silsesquioxanes as homogeneous catalysts for oxidative reactions, (ii) preparation of immobilized or polymeric catalysts, and (iii) preparation of porous oxide catalysts utilizing metalcontaining silsesquioxanes. The present authors found that the liquid phase photo-oxidation of cyclohexane in the presence of a vanadium-containing silsesquioxane as a homogeneous catalyst selectively afforded cyclohexanol and cyclohexanone in high yields. Facile synthetic methods for group 4 metal-containing silsesquioxanes with functionalized silyl (or germyl) groups are presented. Remarkably, titanocene(IV)-containing silsesquioxanes have been synthesized for the first time. The presence of alkenylsilyl substituents shows a promotional effect on the epoxidation of cycloalkenes, which was found to be more significant for titaniumbridged silsesquioxanes. By utilizing these silsesquioxanes, polymeric, starburst-like, and dendritic silsesquioxanes were prepared as well as novel caged or macrocyclic molecules with organic-inorganic hybrid structures. The controlled calcination of these metalcontaining silsesquioxanes at around 823 K produces porous oxides with high BET surface areas of 300-520 m 2 g )1 and uniformlycontrolled micropores of 0.5-0.6 nm diameter. The oxides are found to include a well-dispersed metallic oxide species. From group 13 elements-containing silsesquioxanes Bro¨nsted acidic oxides are produced. Among them, aluminum-containing oxides show excellent activities for the cracking of cumene even at low temperature, 523 K, in spite of their amorphous nature.

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Solid-Phase Immobilization of a New Epoxidation Catalyst

Cited by 85 publications

References 1 publication

Remarkable effect of ordered mesoporous carbon support in tantalum oxide-catalyzed selective epoxidation of cyclooctene

Remarkable effect of ordered mesoporous carbon support in tantalum oxide-catalyzed selective epoxidation of cyclooctene

An Overview of Zeolite, Zeotype and Mesoporous Solids Chemistry: Design, Synthesis and Catalytic Properties

Preparation of Novel Materials for Catalysts Utilizing Metal-Containing Silsesquioxanes

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