Synthesis, Characterization, and Catalytic Activity of Ti-MCM-41 Structures

Blasco, Teresa; Corma, Avelino; Navarro, Martí; Pariente, Joaquín Pérez

doi:10.1006/jcat.1995.1232

Cited by 634 publications

(347 citation statements)

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“…Catalytic activity and selectivity of Ti-MCM catalysts were correlated with molar ratios of Ti (IV)/(Si Ti (IV)+ Ti (VI)+ TiO (VI)) and Ti (IV)/ (Ti (IV)+ Ti (VI)+ TiO (VI)), respectively, as shown in Figure 4. These results support that Ti(IV) species plays a role as the active sites for epoxidation of cyclohexene, which agrees with the results reported in the literatures [1][2][3][4]. Activity and selectivity for the production of cyclohexene oxide in the present study were higher than those described in the literature [16].…”

Section: Synthesis Of Purely Siliceous Mcm-41supporting

confidence: 93%

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Characteristics of Ti-MCM-41 Post-synthesized in Organic or Aqueous Solution using Organo-titanium Compounds as Ti Sources

Shindo

Kodama

Ozawa

2008

Int. J. Soc. Mater. Eng. Resour

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Post-synthetic procedure has been proposed using organo-titanium compounds as Ti source in toluene or aqueous solution to prepare Ti-MCM-41. Ti-MCM-Tn, prepared using Ti-source dissolved in toluene solution, exhibited well-defined 2d-hexagonal structure, and octahedrally coordinated Ti (VI) was mainly introduced as extra-framework species. Ti-MCM-Wn, prepared from Ti-source in aqueous solution, gave high surface area and partially deteriorated 2d-hexagonal structure. Tetrahedrally coordinated Ti (IV) species was selectively incorporated into the framework of the Ti-MCM-Wn samples. Catalytic activity for oxidation reactions of cyclohexene and selectivity to the formation of cyclohexene oxide were correlated with the concentration of Ti (IV) species and the fraction of Ti (IV) in titanium species located at the surfaces of the pores in the Ti-MCM catalysts, respectively.

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Section: Synthesis Of Purely Siliceous Mcm-41supporting

confidence: 93%

“…titanium incorporated into the framework of mesoporous MCM-41, are effective in selective oxidation of bulky organic compounds [1][2][3]. In the conventional hydrothermal synthesis of Ti-MCM-41, tetraethyl orthosilicate (TEOS) and titanium alkoxides were used as silicon and titanium sources, respectively.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Ti-MCM-41 Post-synthesized in Organic or Aqueous Solution using Organo-titanium Compounds as Ti Sources

Shindo

Kodama

Ozawa

2008

Int. J. Soc. Mater. Eng. Resour

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“…Evidence of such Ti-O-Ti oligomers was found during diffuse reflectance UV-Vis experiments, with the presence of a weak shoulder at 270 nm [82,83] ( Fig. 2-bottom left).…”

Section: Determining the Factors That Affect Catalytic Activitymentioning

confidence: 76%

Optimization of mesoporous titanosilicate catalysts for cyclohexene epoxidation via statistically guided synthesis

et al. 2018

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An efficient approach to improve the catalytic activity of titanosilicates is introduced. The Doehlert matrix (DM) statistical model was utilized to probe the synthetic parameters of mesoporous titanosilicate microspheres (MTSM), in order to increase their catalytic activity with a minimal number of experiments. Synthesis optimization was carried out by varying two parameters simultaneously: homogenizing temperature and surfactant weight. Thirteen different MTSM samples were synthesized in two sequential 'matrices' according to Doehlert conditions and were used to catalyse the epoxidation of cyclohexene with tert-butyl hydroperoxide. The samples (and the corresponding synthesis conditions) with superior catalytic activity in terms of product yield and selectivity were identified. In addition, this approach revealed the limiting values of each synthesis parameter, beyond which the material becomes catalytically ineffective. This study demonstrates that the DM approach can be broadly used as a powerful and time-efficient tool for investigating the optimal synthesis conditions of heterogeneous catalysts. Abbreviation

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“…Oxidation reactions have been carried out using microporous TS-1 catalysts [22,46,47]. In contrast to crystalline TS-1 catalysts, the atomic ordering of the pore walls in mesoporous MCM-41 and MCM-48 type materials are amorphous.…”

Section: Catalytic Studiesmentioning

confidence: 99%

“…In particular, the oxidation of aromatics [20,21], oxidation of alkenes [22][23][24][25][26][27][28] and unsaturated alcohols [29], and oxidation of thioethers [30] have been successfully demonstrated using titania supported on mesoporous substrates such as MCM-41, SBA-15, MCM-48, etc. In contrast to the use of MCM-41 and SBA-15, studies involving MCM-48 as a support to disperse titania nanoclusters for oxidation reactions are relatively scarce.…”

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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Synthesis, Characterization, and Catalytic Activity of Ti-MCM-41 Structures

Cited by 634 publications

References 0 publications

Characteristics of Ti-MCM-41 Post-synthesized in Organic or Aqueous Solution using Organo-titanium Compounds as Ti Sources

Characteristics of Ti-MCM-41 Post-synthesized in Organic or Aqueous Solution using Organo-titanium Compounds as Ti Sources

Optimization of mesoporous titanosilicate catalysts for cyclohexene epoxidation via statistically guided synthesis

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

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