Remarkable activity enhancement by trimethylsilylation in oxidation of alkenes and alkanes with H2O2 catalyzed by titanium-containing mesoporous molecular sieves

Tatsumi, Takashi; Koyano, Keiko A.; Igarashi, Naoko

doi:10.1039/a706175g

Cited by 228 publications

(154 citation statements)

References 16 publications

(16 reference statements)

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“…These results clearly indicate the superiority of using carbon support materials in order to achieve high epoxide selectivity. The higher selectivity obtained with the carbon supports can be attributed to their hydrophobicity [14][15][16][17][18]. The hydrophobic nature of carbon supports might facilitate adsorption of olefin molecules due to their less polarity, which leads to suppress further oxidation of more polar epoxide and decomposition of H 2 O 2 [27].…”

Section: Epoxidation Of Cyclooctene Catalyzed By Tantalum Oxide Suppomentioning

confidence: 99%

“…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. Although this problem has been overcome by introducing hydrophobic organic groups onto the oxide supports [14][15][16][17][18][19], limited reports have been focused on the utilisation of carbon support [20][21][22], which is expected to provide hydrophobic reaction environments without the need for any organic modification. One carbon material used here was carbon nanotubes [21,22], which can provide unique catalytic performance albeit irregular in structure.…”

Section: Introductionmentioning

confidence: 99%

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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: Epoxidation Of Cyclooctene Catalyzed By Tantalum Oxide Suppomentioning

confidence: 99%

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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“…TiO2-MCM-48 prepared by a hydrothermal method was examined for the catalytic oxidation of cyclohexene. The results suggest that the corresponding alcohol, diol, ketone, and epoxide were formed with a selectivity of only 4.7% for cyclohexene oxide [35]. In another study, TiO2-MCM-48 prepared by hydrothermal method and without any sodium ions exhibited higher activity (initial rate being four times higher) for the oxidation of cyclohexene in comparison to a material prepared using sodium ions [36].…”

Section: Introductionmentioning

confidence: 91%

“…Titania based MCM-48 materials have been utilized for selective oxidation of styrene [31], 2,6-di-tert-butylphenol [32,33], methyloleate [34], and cyclohexene [25,[35][36][37][38][39]. TiO2-MCM-48 prepared by a hydrothermal method was examined for the catalytic oxidation of cyclohexene.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Room Temperature Synthesis of Titanium Dioxide Nanoclusters Dispersed on Cubic MCM-48 Mesoporous Materials

Budhi

Zhao

et al. 2015

Catalysts

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Titania containing cubic MCM-48 mesoporous materials were synthesized successfully at room temperature by a modified Stöber method. The integrity of the cubic mesoporous phase was retained even at relatively high loadings of titania. The TiO2-MCM-48 materials were extensively characterized by a variety of physico-chemical techniques. The physico-chemical characterization indicate that Ti 4+ ions can be substituted in framework tetrahedral positions. The relative amount of Ti 4+ ions in tetrahedral position was dependent on the order of addition of the precursor. Even at relatively high loadings of titania, no distinct bulk phase of titania could be observed indicating that the titania nanoclusters are well dispersed on the high surface area mesoporous material and probably exist as amorphous nanoclusters. The TiO2-MCM-48 materials were found to exhibit 100% selectivity in the cyclohexene oxidation at room temperature in the presence of tert-butylhydroperoxide (t-BHP) as the oxidant. The results suggest that room temperature synthesis is an attractive option for the preparation of TiO2-MCM-48 materials with interesting catalytic properties. OPEN ACCESSCatalysts 2015, 5 1604

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“…74 Ti-MCM-41 and Ti-MCM-48 were treated with trimethylsilane, improving the catalytic activity in the oxidation of alkenes with H 2 O 2 . 75 For instance, the turnover number (TON) was increased from 5 to 112 in the cyclohexene epoxidation by silylating Ti-MCM-41.…”

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confidence: 99%

Advances in the synthesis of titanosilicates: From the medium pore TS-1 zeolite to highly-accessible ordered materials

Moliner

Corma

2014

Microporous and Mesoporous Materials

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In the present review, we would like to cover the most fundamental advances achieved in the design of ordered titanosilicates since the earlier discovery of TS-1 reported by EniChem in the mid-eighties. The invention of the medium-pore TS-1 zeolite was a breakthrough, and this material has been applied as efficient catalyst in diverse industrial applications. However, its limited pore size (5-5.5 Å) offers diffusion limitations when working with large molecules. The design and preparation of open titanosilicates, such as large pore molecular sieves, mesoporous ordered materials, or layered-type zeolites will be described. The applicability of these titanosilicates to catalytic oxidation processes requiring bulky organic molecules will also be presented.

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Remarkable activity enhancement by trimethylsilylation in oxidation of alkenes and alkanes with H2O2 catalyzed by titanium-containing mesoporous molecular sieves

Cited by 228 publications

References 16 publications

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

Investigation of Room Temperature Synthesis of Titanium Dioxide Nanoclusters Dispersed on Cubic MCM-48 Mesoporous Materials

Advances in the synthesis of titanosilicates: From the medium pore TS-1 zeolite to highly-accessible ordered materials

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