The use of H2O2 over titanium-grafted mesoporous silica catalysts: a step further towards sustainable epoxidation

Guidotti, Matteo; Pirovano, Claudio; Ravasio, Nicoletta; Lázaro, Beatriz; Fraile, José M.; Mayoral, José A.; Coq, Bernard; Galarneau, Anne

doi:10.1039/b903302e

Cited by 89 publications

(70 citation statements)

References 37 publications

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“…The present study suggests that the hydrophobic catalysis environment for selective olefin epoxidation, which has been mainly prepared by organic modification, can be provided by use of ordered mesoporous carbon catalyst supports. The detailed studies to understand the effect of the mesoporous structure and precise tailoring of the functionality on carbon surface are to be conducted for further improvement in catalyst design using carbon support materials [28][29][30]. …”

Section: Resultsmentioning

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: Resultsmentioning

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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“…Recent published works have been focused on the use of mesostructured silicas and its aluminated variants (MCM-41, Al-MCM-41, SBA-15 and Al-SBA-15) to prepare novel catalysts and applied porous materials with very promising behaviours [1][2][3][4]. Studies on metallocene and other transition metal catalysts have been performed, dealing mainly with the effects of support composition, preparation and polymerisation conditions on polymerisation activity [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Hybrid HDPE/MCM-41 nanocomposites: Crystalline structure and viscoelastic behaviour

Cerrada

Pérez

Lourenço

et al. 2010

Microporous and Mesoporous Materials

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a b s t r a c tPolyethylene-based nanocomposites have been prepared by in situ polymerisation of ethylene with mesostructured MCM-41 within a large range of nanofiller concentrations. The structural, thermal and viscoelastic studies have shown that the use of mesoporous MCM-41 as catalyst carrier and its further presence in the final material is an effective route for the successful attainment of nanocomposites. Data shows that minimal changes in crystallinity are observed but crystallites become thicker as MCM-41 content is raised in the nanocomposites. A confinement effect is found and a delay in the crystallisation process of the macrochains within pores and channels is observed. These novel self-reinforced nanocomposites present an enhanced rigidity, which becomes more important as temperature is raised. Accordingly, they exhibit an improved mechanical performance without varying the final processing temperature since T m is the same for all of the specimens. In agreement with other works, it is confirmed that the MCM-41 acts as promoter for polyethylene degradation, an easier degradability being observed in these nanocomposites.

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“…The oxidation of cyclohexene was chosen as a test reaction and the turnover frequency was found to be 5.1 (h −1 ) [38]. The epoxidation of cyclohexene with aqueous hydrogen peroxide over mesostructured Ti(Cp)2Cl2-grafted TiO2-MCM-48 was examined in another study [39]. It was observed that the TiO2-MCM-48 catalyst exhibited higher activity in comparison to TiO2-MCM-41.…”

Section: Introductionmentioning

confidence: 99%

“…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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The use of H2O2 over titanium-grafted mesoporous silica catalysts: a step further towards sustainable epoxidation

Cited by 89 publications

References 37 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

Hybrid HDPE/MCM-41 nanocomposites: Crystalline structure and viscoelastic behaviour

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

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